ASP.NET2.0文件上傳以及圖片處理總結(jié)篇

thy 2009-09-09

展開全文

1.最簡(jiǎn)單的單文件上傳(沒(méi)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(cè)真正文件名)
6.上傳文件文件名唯一性處理(時(shí)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(jiǎn)單的單文件上傳(沒(méi)花頭)

效果圖：

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

后臺(tái)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(qǐng)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(cuò)誤！原因是：" + ex.ToString();
        }
    }
}

前臺(tái)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：

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(qǐng)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(cuò)誤！原因：" + error.ToString();
                    }

                }

            }
        }

    }

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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www./TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www./1999/xhtml" >
<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(tái)代碼和1.最簡(jiǎn)單的單文件上傳一樣；
前臺(tái)代碼：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www./TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www./1999/xhtml" >
<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(shuō)明：點(diǎn)擊上傳時(shí)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：

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

                    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(qǐng)上傳圖片";
                }
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯(cuò)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(cè)真正文件名)
其實(shí)方法4并不好，因?yàn)橛脩艨梢园裍XX.txt偽裝為XXX.jpg。

效果圖：

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(qǐng)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(qǐng)上傳圖片";
                }
            }
        }
        catch (Exception error)
        {
            this.lb_info.Text = "上傳發(fā)生錯(cuò)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(shuō)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(shí)間戳+SessionID)

效果圖：

說(shuō)明：年月日時(shí)分秒+臨時(shí)session+原文件名如果大家怕還會(huì)重復(fù)可以加GUID
后臺(tái)代碼：

try
        {
            if (FileUpload1.PostedFile.FileName == "")
            {
                this.lb_info.Text = "請(qǐng)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(cuò)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;
        }
    }

}

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(qǐng)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(cuò)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./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(shuō)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(shuō)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;

//------------------------------------------------------------
//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;

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);

//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));

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

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

ColorMap[] remapTable = {colorMap};

imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

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;

//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(tái)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(qǐng)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(cuò)誤！原因：" + error.ToString();
        }
    }

}

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

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