国产一级a片免费看高清,亚洲熟女中文字幕在线视频,黄三级高清在线播放,免费黄色视频在线看

打開APP
userphoto
未登錄

開通VIP，暢享免費電子書等14項超值服

開通VIP

首頁

好書

留言交流

下載APP

聯(lián)系客服
ASP.NET2.0文件上傳以及圖片處理總結(jié)篇

1.最簡單的單文件上傳(沒花頭)
2.多文件上傳
3.客戶端檢查上傳文件類型(以上傳圖片為例)
4.服務(wù)器端檢查上傳文件類型(以上傳圖片為例)
5.服務(wù)器端檢查上傳文件類型(可以檢測真正文件名)
6.上傳文件文件名唯一性處理(時間戳+SessionID)
7.上傳圖片生成等比例縮略圖
8.上傳圖片加水印(文字水印，圖片水印，文字+圖片水印)
9.

1.最簡單的單文件上傳(沒花頭)

效果圖：

說明：這是最基本的文件上傳，在asp.net1.x中沒有這個FileUpload控件，只有html的上傳控件，那時候要把html控件轉(zhuǎn)化為服務(wù)器控件，很不好用。其實所有文件上傳的美麗效果都是從這個FileUpload控件衍生，第一個例子雖然簡單卻是根本。

后臺代碼：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                string serverpath = Server.MapPath("images/") + filename;
                FileUpload1.PostedFile.SaveAs(serverpath);
                this.lb_info.Text = "上傳成功！";
            }
        }
        catch (Exception ex)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因是：" + ex.ToString();
        }
    }
}

前臺代碼：
<table style="width: 343px">
            <tr>
                <td style="width: 100px">
                    單文件上傳</td>
                <td style="width: 100px">
                </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="475px" />
                    </td>
                <td style="width: 100px">
                    <asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="上傳" /></td>
            </tr>
            <tr>
                <td style="width: 100px; height: 21px;">
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="183px"></asp:Label></td>
                <td style="width: 100px; height: 21px">
                </td>
            </tr>
        </table> 

2.多文件上傳

效果圖：


后臺代碼：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
      
            if ((FileUpload1.PostedFile.FileName == "" && FileUpload2.PostedFile.FileName == "")&&FileUpload3.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                HttpFileCollection myfiles = Request.Files;
                for (int i = 0; i < myfiles.Count; i++)
                {
                    HttpPostedFile mypost = myfiles[i];
                    try
                    {
                        if (mypost.ContentLength > 0)
                        {
                             string filepath = mypost.FileName;
                             string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                             string serverpath = Server.MapPath("images/") + filename;
                             mypost.SaveAs(serverpath);
                             this.lb_info.Text = "上傳成功！";
                        }
                    }
                    catch (Exception error)
                    {
                        this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
                    }

                }
             
            }
        }
     
    }

前臺代碼：
 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "

<html xmlns="<head runat="server">
    <title>多文件上傳 清清月兒http://blog.csdn.net/21aspnet/</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table style="width: 343px">
            <tr>
                <td style="width: 100px">
                    多文件上傳</td>
                <td style="width: 100px">
                </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="475px" />
                    </td>
                <td style="width: 100px">
                    </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    <asp:FileUpload ID="FileUpload2" runat="server" Width="475px" /></td>
                <td style="width: 100px">
                </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    <asp:FileUpload ID="FileUpload3" runat="server" Width="475px" /></td>
                <td style="width: 100px">
                </td>
            </tr>
            <tr>
                <td style="width: 100px">
                    <asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="一起上傳" />
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="183px"></asp:Label></td>
                <td style="width: 100px">
                </td>
            </tr>
        </table>
  
    </div>
    </form>
</body>
</html>

3.客戶端檢查上傳文件類型(以上傳圖片為例)

效果圖：

后臺代碼和1.最簡單的單文件上傳一樣；
前臺代碼：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "

<html xmlns="<head runat="server">
    <title>清清月兒 http://blog.csdn.net/21aspnet</title>
<script   language="javascript">
 function Check_FileType()
{
var str=document.getElementById("FileUpload1").value;
 var pos = str.lastIndexOf(".");
 var lastname = str.substring(pos,str.length)
 if (lastname.toLowerCase()!=".jpg" && lastname.toLowerCase()!=".gif")
 {
     alert("您上傳的文件類型為"+lastname+"，圖片必須為.jpg,.gif類型");
     return false;
 }
 else
 {
  return true;
 }
}
 </script> 

</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table style="width: 343px">
            <tr>
                <td style="width: 104px">
                    文件上傳判斷</td>
                <td style="width: 100px">
                </td>
            </tr>
            <tr>
                <td style="width: 104px">
                    <asp:FileUpload ID="FileUpload1" runat="server" Width="400px" />
                    </td>
                <td style="width: 100px">
                    <asp:Button ID="bt_upload" runat="server" OnClick="bt_upload_Click" Text="上傳"  OnClientClick="return Check_FileType()"/></td>
            </tr>
            <tr>
                <td style="width: 104px; height: 21px;">
                    <asp:Label ID="lb_info" runat="server" ForeColor="Red" Width="183px"></asp:Label></td>
                <td style="width: 100px; height: 21px">
                </td>
            </tr>
        </table>
  
    </div>
    </form>
</body>
</html>
說明：點擊上傳時先觸發(fā)客戶端事件Check_FileType；

4.服務(wù)器端檢查上傳文件類型(以上傳圖片為例)

效果圖：

 

后臺代碼：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                if (IsAllowedExtension(FileUpload1) == true)
                {

                    string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                    string serverpath = Server.MapPath("images/") + filename;
                    FileUpload1.PostedFile.SaveAs(serverpath);
                    this.lb_info.Text = "上傳成功！";
                }
                else
                {
                    this.lb_info.Text = "請上傳圖片";
                }
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
        }
    }
   public static bool IsAllowedExtension(FileUpload hifile)
    {
        string strOldFilePath = "", strExtension = "";
        string[] arrExtension =   { ".gif", ".jpg", ".jpeg", ".bmp", ".png" };
        if (hifile.PostedFile.FileName != string.Empty)
        {
            strOldFilePath = hifile.PostedFile.FileName;
            strExtension = strOldFilePath.Substring(strOldFilePath.LastIndexOf("."));
            for (int i = 0; i < arrExtension.Length; i++)
            {
                if (strExtension.Equals(arrExtension[i]))
                {
                    return true;
                }
            }
        }
        return false;
    }  

}


 5.服務(wù)器端檢查上傳文件類型(可以檢測真正文件名)
其實方法4并不好，因為用戶可以把XXX.txt偽裝為XXX.jpg。

效果圖：


后臺代碼：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    //清清月兒 http://blog.csdn.net/21aspnet
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                if (IsAllowedExtension(FileUpload1) == true)
                {
                    string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                    string serverpath = Server.MapPath("images/") + filename;
                    FileUpload1.PostedFile.SaveAs(serverpath);
                    this.lb_info.Text = "上傳成功！";
                }
                else
                {
                    this.lb_info.Text = "請上傳圖片";
                }
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
        }
    }
    public static bool IsAllowedExtension(FileUpload hifile)
    {
        System.IO.FileStream fs = new System.IO.FileStream(hifile.PostedFile.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        System.IO.BinaryReader r = new System.IO.BinaryReader(fs);
        string fileclass = "";
        byte buffer;
        try
        {
            buffer = r.ReadByte();
            fileclass = buffer.ToString();
            buffer = r.ReadByte();
            fileclass += buffer.ToString();

        }
        catch
        {
         
        }
        r.Close();
        fs.Close();
        if (fileclass == "255216" || fileclass == "7173")//說明255216是jpg;7173是gif;6677是BMP,13780是PNG;7790是exe,8297是rar
        {
            return true;
        }
        else
        {
            return false;
        }

    } 

}

6.上傳文件文件名唯一性處理(時間戳+SessionID)

效果圖：

說明：年月日時分秒+臨時session+原文件名 如果大家怕還會重復(fù)可以加GUID
后臺代碼：


try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                string serverpath = Server.MapPath("images/") + System.DateTime.Now.ToString("yyy-MM-dd-hh-mm-ss") + Session.SessionID + filename;
                FileUpload1.PostedFile.SaveAs(serverpath);
                this.lb_info.Text = "上傳成功！";
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
        }

注：GUID的方法：Guid myGuid=Guid.NewGuid();

7.上傳圖片生成等比例縮略圖

效果圖：


縮略圖代碼：
ImageThumbnail.cs
using System;
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

public class ImageThumbnail
{
    public Image ResourceImage;
    private int ImageWidth;
    private int ImageHeight;
    public string ErrorMessage;

    public ImageThumbnail(string ImageFileName)
    {
        ResourceImage = Image.FromFile(ImageFileName);
        ErrorMessage = "";
    }

    public bool ThumbnailCallback()
    {
        return false;
    }

 

    // 方法1，按大小
    public bool ReducedImage(int Width, int Height, string targetFilePath)
    {
        try
        {
            Image ReducedImage;
            Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
            ReducedImage = ResourceImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero);
            ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
            ReducedImage.Dispose();
            return true;
        }
        catch (Exception e)
        {
            ErrorMessage = e.Message;
            return false;
        }
    }


    // 方法2，按百分比  縮小60% Percent為0.6 targetFilePath為目標(biāo)路徑
    public bool ReducedImage(double Percent, string targetFilePath)
    {
        try
        {
            Image ReducedImage;
            Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
            ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent);
            ImageHeight = (ResourceImage.Height)*ImageWidth/ ResourceImage.Width;//等比例縮放
            ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
            ReducedImage.Save(@targetFilePath, ImageFormat.Jpeg);
            ReducedImage.Dispose();
            return true;
        }
        catch (Exception e)
        {
            ErrorMessage = e.Message;
            return false;
        }
    }


}

后臺代碼：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                string serverpath1 = Server.MapPath("images/") + filename;
                string serverpath2 = Server.MapPath("images/") + System.DateTime.Now.ToString("yyy-MM-dd-hh-mm-ss") + Session.SessionID + filename;
                FileUpload1.PostedFile.SaveAs(serverpath1);
                ImageThumbnail img = new ImageThumbnail(filepath);
                img.ReducedImage(0.4, serverpath2);//0.4表示縮小40%
                this.lb_info.Text = "上傳成功！";
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
        }
    }


}

8.上傳圖片加水印(文字水印，圖片水印，文字+圖片水印)

效果圖：
原圖

水印

給圖片加水印以后（注意右上角+正下方）

 

代碼：
DrawImg.cs  出自http://www.codeproject.com/csharp/watermark.asp
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
public class DrawImg
{
 private string  WorkingDirectory = string.Empty ; //路徑
 private string  ImageName = string.Empty;   //被處理的圖片
 private string  ImageWater = string.Empty;  //水印圖片
 private string  FontString = string.Empty;  //水印文字
 

 enum DealType{NONE,WaterImage,WaterFont,DoubleDo}; //枚舉命令

 private DealType dealtype;
 

 public DrawImg()
 {}

 public string PublicWorkingDirectory
 {
  get
  {
   return WorkingDirectory;
  }
  set
  {
   WorkingDirectory = value;
  }
 }

 public string PublicImageName
 {
  get
  {
   return ImageName;
  }
  set
  {
   ImageName = value;
  }
 }


 public string PublicImageWater
 {
  get
  {
   return ImageWater;
  }
  set  //設(shè)置了水印圖片的話說明是要水印圖片效果的
  {
   dealtype = DealType.WaterImage;
   ImageWater = value;
  }
 }

 public string PublicFontString
 {
  get
  {
   return FontString;
  }
  set //設(shè)置了水印文字的話說明是要水印文字效果的
  {
   dealtype = DealType.WaterFont;
   FontString = value;
  }
 }

 


 public void DealImage()
 {
  IsDouble();

  switch( dealtype )
  {
   case DealType.WaterFont: WriteFont(); break;
   case DealType.WaterImage: WriteImg(); break;
   case DealType.DoubleDo: WriteFontAndImg(); break;
  }

 }

 private void IsDouble()
 {
  if(ImageWater+""!="" && FontString+""!="")
  {
            dealtype = DealType.DoubleDo;
  }
 }

 private void WriteFont()
 {
  //set a working directory
  //string WorkingDirectory = @"C:Watermark_srcWaterPic";

  //define a string of text to use as the Copyright message
  //string Copyright = "Copyright ?2002 - AP Photo/David Zalubowski";

  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //------------------------------------------------------------
  //Step #1 - Insert Copyright message
  //------------------------------------------------------------

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure

  //-------------------------------------------------------
  //to maximize the size of the Copyright message we will
  //test multiple Font sizes to determine the largest posible
  //font we can use for the width of the Photograph
  //define an array of point sizes you would like to consider as possiblities
  //-------------------------------------------------------
  int[] sizes = new int[]{16,14,12,10,8,6,4};

  Font crFont = null;
  SizeF crSize = new SizeF();

  //Loop through the defined sizes checking the length of the Copyright string
  //If its length in pixles is less then the image width choose this Font size.
  for (int i=0 ;i<7; i++)
  {
   //set a Font object to Arial (i)pt, Bold
   //crFont = new Font("arial", sizes[i], FontStyle.Bold);

   crFont = new Font("arial",sizes[i],FontStyle.Bold);

   //Measure the Copyright string in this Font
   crSize = grPhoto.MeasureString(FontString, crFont);

   if((ushort)crSize.Width < (ushort)phWidth)
    break;
  }

  //Since all photographs will have varying heights, determine a
  //position 5% from the bottom of the image
  int yPixlesFromBottom = (int)(phHeight *.05);

  //Now that we have a point size use the Copyrights string height
  //to determine a y-coordinate to draw the string of the photograph
  float yPosFromBottom = ((phHeight - yPixlesFromBottom)-(crSize.Height/2));

  //Determine its x-coordinate by calculating the center of the width of the image
  float xCenterOfImg = (phWidth/2);

  //Define the text layout by setting the text alignment to centered
  StringFormat StrFormat = new StringFormat();
  StrFormat.Alignment = StringAlignment.Center;

  //define a Brush which is semi trasparent black (Alpha set to 153)
  SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));

  //Draw the Copyright string
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush2,                           //Brush
   new PointF(xCenterOfImg+1,yPosFromBottom+1),  //Position
   StrFormat);

  //define a Brush which is semi trasparent white (Alpha set to 153)
  SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));

  //Draw the Copyright string a second time to create a shadow effect
  //Make sure to move this text 1 pixel to the right and down 1 pixel
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush,                           //Brush
   new PointF(xCenterOfImg,yPosFromBottom),  //Position
   StrFormat);  
 
  imgPhoto = bmPhoto;
  grPhoto.Dispose();

  //save new image to file system.
  imgPhoto.Save(WorkingDirectory + ImageName + "_finally.jpg", ImageFormat.Jpeg);
  imgPhoto.Dispose();
 
  //Text alignment
 }


 private void WriteImg()
 {
  //set a working directory
  //string WorkingDirectory = @"C:Watermark_srcWaterPic";

  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //create a image object containing the watermark
  Image imgWatermark = new Bitmap(WorkingDirectory + ImageWater);
  int wmWidth = imgWatermark.Width;
  int wmHeight = imgWatermark.Height;

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure


  //------------------------------------------------------------
  //Step #2 - Insert Watermark image
  //------------------------------------------------------------

  //Create a Bitmap based on the previously modified photograph Bitmap
  Bitmap bmWatermark = new Bitmap(bmPhoto);
  bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
  //Load this Bitmap into a new Graphic Object
  Graphics grWatermark = Graphics.FromImage(bmWatermark);

  //To achieve a transulcent watermark we will apply (2) color
  //manipulations by defineing a ImageAttributes object and
  //seting (2) of its properties.
  ImageAttributes imageAttributes = new ImageAttributes();

  //The first step in manipulating the watermark image is to replace
  //the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
  //to do this we will use a Colormap and use this to define a RemapTable
  ColorMap colorMap = new ColorMap();

  //My watermark was defined with a background of 100% Green this will
  //be the color we search for and replace with transparency
  colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
  colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

  ColorMap[] remapTable = {colorMap};

  imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

  //The second color manipulation is used to change the opacity of the
  //watermark.  This is done by applying a 5x5 matrix that contains the
  //coordinates for the RGBA space.  By setting the 3rd row and 3rd column
  //to 0.3f we achive a level of opacity
  float[][] colorMatrixElements = {
           new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},     
           new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},      
           new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},      
           new float[] {0.0f,  0.0f,  0.0f,  0.3f, 0.0f},      
           new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};
  ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

  imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
   ColorAdjustType.Bitmap);

  //For this example we will place the watermark in the upper right
  //hand corner of the photograph. offset down 10 pixels and to the
  //left 10 pixles

  int xPosOfWm = ((phWidth - wmWidth)-10);
  int yPosOfWm = 10;

  grWatermark.DrawImage(imgWatermark,
   new Rectangle(xPosOfWm,yPosOfWm,wmWidth,wmHeight),  //Set the detination Position
   0,                  // x-coordinate of the portion of the source image to draw.
   0,                  // y-coordinate of the portion of the source image to draw.
   wmWidth,            // Watermark Width
   wmHeight,      // Watermark Height
   GraphicsUnit.Pixel, // Unit of measurment
   imageAttributes);   //ImageAttributes Object

  //Replace the original photgraphs bitmap with the new Bitmap
  imgPhoto = bmWatermark;
  grPhoto.Dispose();
  grWatermark.Dispose();

  //save new image to file system.
  imgPhoto.Save(WorkingDirectory + ImageName +"_finally.jpg", ImageFormat.Jpeg);
  imgPhoto.Dispose();
  imgWatermark.Dispose();

 }


 private void WriteFontAndImg()
 { 
 
  //create a image object containing the photograph to watermark
  Image imgPhoto = Image.FromFile(WorkingDirectory + ImageName);
  int phWidth = imgPhoto.Width;
  int phHeight = imgPhoto.Height;

  //create a Bitmap the Size of the original photograph
  Bitmap bmPhoto = new Bitmap(phWidth, phHeight, PixelFormat.Format24bppRgb);

  bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);

  //load the Bitmap into a Graphics object
  Graphics grPhoto = Graphics.FromImage(bmPhoto);

  //create a image object containing the watermark
  Image imgWatermark = new Bitmap(WorkingDirectory + ImageWater);
  int wmWidth = imgWatermark.Width;
  int wmHeight = imgWatermark.Height;

  //------------------------------------------------------------
  //Step #1 - Insert Copyright message
  //------------------------------------------------------------

  //Set the rendering quality for this Graphics object
  grPhoto.SmoothingMode = SmoothingMode.AntiAlias;

  //Draws the photo Image object at original size to the graphics object.
  grPhoto.DrawImage(
   imgPhoto,                               // Photo Image object
   new Rectangle(0, 0, phWidth, phHeight), // Rectangle structure
   0,                                      // x-coordinate of the portion of the source image to draw.
   0,                                      // y-coordinate of the portion of the source image to draw.
   phWidth,                                // Width of the portion of the source image to draw.
   phHeight,                               // Height of the portion of the source image to draw.
   GraphicsUnit.Pixel);                    // Units of measure

  //-------------------------------------------------------
  //to maximize the size of the Copyright message we will
  //test multiple Font sizes to determine the largest posible
  //font we can use for the width of the Photograph
  //define an array of point sizes you would like to consider as possiblities
  //-------------------------------------------------------
  int[] sizes = new int[]{16,14,12,10,8,6,4};

  Font crFont = null;
  SizeF crSize = new SizeF();

  //Loop through the defined sizes checking the length of the Copyright string
  //If its length in pixles is less then the image width choose this Font size.
  for (int i=0 ;i<7; i++)
  {
   //set a Font object to Arial (i)pt, Bold
   crFont = new Font("arial", sizes[i], FontStyle.Bold);
   //Measure the Copyright string in this Font
   crSize = grPhoto.MeasureString(FontString, crFont);

   if((ushort)crSize.Width < (ushort)phWidth)
    break;
  }

  //Since all photographs will have varying heights, determine a
  //position 5% from the bottom of the image
  int yPixlesFromBottom = (int)(phHeight *.05);

  //Now that we have a point size use the Copyrights string height
  //to determine a y-coordinate to draw the string of the photograph
  float yPosFromBottom = ((phHeight - yPixlesFromBottom)-(crSize.Height/2));

  //Determine its x-coordinate by calculating the center of the width of the image
  float xCenterOfImg = (phWidth/2);

  //Define the text layout by setting the text alignment to centered
  StringFormat StrFormat = new StringFormat();
  StrFormat.Alignment = StringAlignment.Center;

  //define a Brush which is semi trasparent black (Alpha set to 153)
  SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));

  //Draw the Copyright string
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush2,                           //Brush
   new PointF(xCenterOfImg+1,yPosFromBottom+1),  //Position
   StrFormat);

  //define a Brush which is semi trasparent white (Alpha set to 153)
  SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));

  //Draw the Copyright string a second time to create a shadow effect
  //Make sure to move this text 1 pixel to the right and down 1 pixel
  grPhoto.DrawString(FontString,                 //string of text
   crFont,                                   //font
   semiTransBrush,                           //Brush
   new PointF(xCenterOfImg,yPosFromBottom),  //Position
   StrFormat);                               //Text alignment

  //------------------------------------------------------------
  //Step #2 - Insert Watermark image
  //------------------------------------------------------------

  //Create a Bitmap based on the previously modified photograph Bitmap
  Bitmap bmWatermark = new Bitmap(bmPhoto);
  bmWatermark.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution);
  //Load this Bitmap into a new Graphic Object
  Graphics grWatermark = Graphics.FromImage(bmWatermark);

  //To achieve a transulcent watermark we will apply (2) color
  //manipulations by defineing a ImageAttributes object and
  //seting (2) of its properties.
  ImageAttributes imageAttributes = new ImageAttributes();

  //The first step in manipulating the watermark image is to replace
  //the background color with one that is trasparent (Alpha=0, R=0, G=0, B=0)
  //to do this we will use a Colormap and use this to define a RemapTable
  ColorMap colorMap = new ColorMap();

  //My watermark was defined with a background of 100% Green this will
  //be the color we search for and replace with transparency
  colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
  colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);

  ColorMap[] remapTable = {colorMap};

  imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

  //The second color manipulation is used to change the opacity of the
  //watermark.  This is done by applying a 5x5 matrix that contains the
  //coordinates for the RGBA space.  By setting the 3rd row and 3rd column
  //to 0.3f we achive a level of opacity
  float[][] colorMatrixElements = {
           new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},     
           new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},      
           new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},      
           new float[] {0.0f,  0.0f,  0.0f,  0.3f, 0.0f},      
           new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}};
  ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);

  imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default,
   ColorAdjustType.Bitmap);

  //For this example we will place the watermark in the upper right
  //hand corner of the photograph. offset down 10 pixels and to the
  //left 10 pixles

  int xPosOfWm = ((phWidth - wmWidth)-10);
  int yPosOfWm = 10;

  grWatermark.DrawImage(imgWatermark,
   new Rectangle(xPosOfWm,yPosOfWm,wmWidth,wmHeight),  //Set the detination Position
   0,                  // x-coordinate of the portion of the source image to draw.
   0,                  // y-coordinate of the portion of the source image to draw.
   wmWidth,            // Watermark Width
   wmHeight,      // Watermark Height
   GraphicsUnit.Pixel, // Unit of measurment
   imageAttributes);   //ImageAttributes Object

  //Replace the original photgraphs bitmap with the new Bitmap
  imgPhoto = bmWatermark;
  grPhoto.Dispose();
  grWatermark.Dispose();

  //save new image to file system.
  imgPhoto.Save(WorkingDirectory + ImageName +"_finally.jpg", ImageFormat.Jpeg);
  imgPhoto.Dispose();
  imgWatermark.Dispose();

      
 }
}


 //水印圖片加水印文字
//   ReDrawImg img = new ReDrawImg();
//   img .PublicWorkingDirectory = @"C:Watermark_srcWaterPic";
//   img .PublicImageName = "watermark_photo.jpg";
//   img .PublicImageWater = "watermark.bmp";
//   img .PublicFontString = "清清月兒";
//   img .DealImage();
 
   //水印文字
   ReDrawImg img = new ReDrawImg();
   img .PublicWorkingDirectory = @"C:Watermark_srcWaterPic";
   img .PublicImageName = "watermark_photo.jpg";  
   img .PublicFontString = @"清清月兒";
   img .DealImage();
 

   //水印圖片
//   ReDrawImg img = new ReDrawImg();
//   img .PublicWorkingDirectory = @"C:Watermark_srcWaterPic";
//   img .PublicImageName = "watermark_photo.jpg";
//   img .PublicImageWater = "watermark.bmp";  
//   img .DealImage();
 
 
后臺代碼：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class _Default : System.Web.UI.Page
{

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void bt_upload_Click(object sender, EventArgs e)
    {
        try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請選擇文件！";
            }
            else
            {
                string filepath = FileUpload1.PostedFile.FileName;
                string filename = filepath.Substring(filepath.LastIndexOf("\") + 1);
                string serverpath1 = Server.MapPath("images/") + filename;
                //string serverpath2 = Server.MapPath("images/") + System.DateTime.Now.ToString("yyy-MM-dd-hh-mm-ss") + Session.SessionID + filename;
                FileUpload1.PostedFile.SaveAs(serverpath1);
                //ImageThumbnail img = new ImageThumbnail(filepath);
                //img.ReducedImage(0.4, serverpath2);
                DrawImg img = new DrawImg();
                img.PublicWorkingDirectory = Server.MapPath("images/");
                img.PublicImageName = filename;
                img.PublicFontString = "                img.PublicImageWater = "yyy.jpg";
                img.DealImage();
                this.lb_info.Text = "上傳成功！";
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯誤！原因：" + error.ToString();
        }
    }


}

 

 

代碼有誤
在獲得文件名時的語句應(yīng)該為string filename = filepath.Substring(filepath.LastIndexOf("\\") + 1);

打開APP，閱讀全文并永久保存 查看更多類似文章
猜你喜歡
類似文章
上傳圖片，限制類型，大小，規(guī)格
根據(jù)文本內(nèi)容創(chuàng)建圖片并返回圖片路徑
教你打造Silverlight超酷翻頁實例 - 瀾夜的日志 - 網(wǎng)易博客
詳解C#數(shù)據(jù)庫存取圖片三大方式 -IT168 技術(shù)開發(fā)專區(qū)
ASP.NET FileUpload 上傳圖片實例
Asp.net FileUpload控件
更多類似文章 >>
生活服務(wù)
分享 收藏 導(dǎo)長圖 關(guān)注 下載文章
綁定賬號成功
后續(xù)可登錄賬號暢享VIP特權(quán)！
如果VIP功能使用有故障，
可點擊這里聯(lián)系客服！

聯(lián)系客服