[原创]超强C#图片上传，加水印，自动生成缩略图源代码

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[原创]超强C#图片上传，加水印，自动生成缩略图源代码

<%@ Page Language=“C#“ AutoEventWireup=“true“ %>
<%@ Import Namespace=“System“ %>
<%@ Import Namespace=“System.IO“ %>
<%@ Import Namespace=“System.Net“ %>
<%@ Import NameSpace=“System.Web“ %>
<%@ Import NameSpace=“Legalsoft.Images“ %>
<script language=“C#“ runat=“server“>

protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
foreach (string f in Request.Files.AllKeys)
{
// 查找是否存在指定的目，如果允许创建目录，则创建之。
string f_path = TextBox1.Text;
if (!System.IO.Directory.Exists(Server.MapPath(f_path)))
{
if (CheckBox1.Checked)
{
System.IO.Directory.CreateDirectory(Server.MapPath(f_path));
}
else
{
return;
}
}
// 获取提交的文件名，包含的全部的目录信息；需要提取其文件名（名字＋后缀）
HttpPostedFile file = Request.Files[f];
string fname = file.FileName.ToLower();
fname = fname.Replace(“\“, “/“);
int lsub = fname.LastIndexOf(“/“);
if (lsub >= 0)
{
fname = fname.Substring(lsub + 1, fname.Length - lsub - 1);
string[] fa_ext = fname.Split(“.“);
string f_pre = fa_ext[fa_ext.Length - 2];
string f_ext = fa_ext[fa_ext.Length - 1];
if (f_ext == “gif“ || f_ext == “jpg“ || f_ext == “jpeg“)
{
file.SaveAs(Server.MapPath(f_path) + “/“ + f_pre + “.“ + f_ext);

XImage img = new XImage();
// 添加水印
if (TextBox2.Text.Trim() != ““)
{
img.markPosition = DropDownList5.Items[DropDownList5.SelectedIndex].Text;
img.Mark(f_path + f_pre + “.“ + f_ext, TextBox2.Text);
}

// 如果需要生成所略图
if (CheckBox2.Checked)
{
int tWidth = Int32.Parse(TextBox3.Text);
int tHeight = Int32.Parse(TextBox4.Text);
img.tBackground = img.ToColor(DropDownList1.Items[DropDownList1.SelectedIndex].Text);
img.tBorder = img.ToColor(DropDownList2.Items[DropDownList2.SelectedIndex].Text);
img.tShadow = img.ToColor(DropDownList3.Items[DropDownList3.SelectedIndex].Text);
img.tQuality = img.ToQuality(DropDownList4.Items[DropDownList4.SelectedIndex].Text);
img.ToThumbnail(f_path + f_pre + “.“ + f_ext, f_path + f_pre + “_thumb.“ + f_ext, tWidth, tHeight);
}
}
}
}
}
}

</script>

<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN“ “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd“>

<html xmlns=“http://www.w3.org/1999/xhtml“ >
<head id=“Head1“ runat=“server“>
<title>C#图片上传及生成缩略图,添加水印的代码</title>
<meta name=“keywords“ content=“C#文件上传的实例代码“/>
<meta name=“description“ content=“在线式代码自动生成器SharpOnline只需要数据库Table定义就自动生成网站的全套C#源代码与页面（包括数据查询于操作、输入页面、编辑页面及其后台页面）。“ />
<meta http-equiv=“content-type“ content=“text/html; charset=gb2312“/>
<meta http-equiv=“content-language“ content=“zh-cn“/>
<link href=“/favicon.ico“ type=“image/x-icon“ rel=“shortcut icon“/>
<link href=“/favicon.ico“ type=“image/x-icon“ rel=“bookmark“/>
<meta http-equiv=“imagetoolbar“ content=“no“/>
<meta name=“distribution“ content=“global“/>
<link href=“/common/style.css“ rel=“stylesheet“ type=“text/css“/>
</head>
<body>
<form id=“form1“ runat=“server“>
<center>

<div style=“938px;background-color:#FFFFFF;“>

<table width=“938“ style=“background-color:#F0F0FF;padding:8px;line-height:24px;text-align:left;“ cellpadding=“0“ cellspacing=“0“>
<tr>
<td align=“right“>保存的目录：</td>
<td>
<asp:TextBox ID=“TextBox1“ runat=“server“>/UploadedFiles/</asp:TextBox>
<asp:CheckBox ID=“CheckBox1“ runat=“server“ Checked=“true“ />自动创建目录
</td>
</tr>
<tr>
<td align=“right“>添加水印字：</td>
<td>
文字：<asp:TextBox ID=“TextBox2“ runat=“server“>50018.COM</asp:TextBox> (可以为空，则不加水印)<br />
位置：
<asp:DropDownList ID=“DropDownList5“ runat=“server“>
<asp:ListItem Selected=“True“>左下角</asp:ListItem>
<asp:ListItem>左上角</asp:ListItem>
<asp:ListItem>右下角</asp:ListItem>
<asp:ListItem>右上角</asp:ListItem>
<asp:ListItem>图片中间</asp:ListItem>
</asp:DropDownList><br />
</td>
</tr>
<tr>
<td align=“right“>生成缩略图：</td>
<td>
<asp:CheckBox ID=“CheckBox2“ Checked=“true“ runat=“server“ />生成缩略图<br />
宽度： <asp:TextBox ID=“TextBox3“ runat=“server“>100</asp:TextBox><br />
高度： <asp:TextBox ID=“TextBox4“ runat=“server“>75</asp:TextBox><br />
背景：
<asp:DropDownList ID=“DropDownList1“ runat=“server“>
<asp:ListItem Selected=“True“>无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
边框：
<asp:DropDownList ID=“DropDownList2“ runat=“server“>
<asp:ListItem Selected=“True“>无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
阴影：
<asp:DropDownList ID=“DropDownList3“ runat=“server“>
<asp:ListItem Selected=“True“>无色</asp:ListItem>
<asp:ListItem>白色</asp:ListItem>
<asp:ListItem>红色</asp:ListItem>
<asp:ListItem>蓝色</asp:ListItem>
<asp:ListItem>黄色</asp:ListItem>
<asp:ListItem>黑色</asp:ListItem>
<asp:ListItem>绿色</asp:ListItem>
<asp:ListItem>紫色</asp:ListItem>
<asp:ListItem>灰色</asp:ListItem>
</asp:DropDownList><br />
质量：
<asp:DropDownList ID=“DropDownList4“ runat=“server“>
<asp:ListItem Selected=“True“>100%</asp:ListItem>
<asp:ListItem>90%</asp:ListItem>
<asp:ListItem>80%</asp:ListItem>
<asp:ListItem>60%</asp:ListItem>
<asp:ListItem>50%</asp:ListItem>
<asp:ListItem>40%</asp:ListItem>
</asp:DropDownList>
</td>
</tr>
<tr>
<td align=“right“>请选择文件：</td>
<td><asp:FileUpload ID=“FileUpload1“ runat=“server“ /></td>
</tr>
<tr>
<td align=“right“></td>
<td><asp:Button ID=“Button2“ runat=“server“ Text=“提交“ Width=“88px“ /></td>
</tr>
</table>

</div>

</center>
</form>
</body>
</html>

[CODE]
csharp
using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
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;
using System.Text;
using System.Text.RegularExpressions;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections;
using System.ComponentModel;

namespace Legalsoft.Images
{
/// <summary>
/// News 的摘要说明
/// </summary>
public class XImage
{
public Color tBackground;
public Color tBorder;
public Color tShadow;
public int tQuality;
public string markPosition;

/// <summary>
/// 图片参数预定义
/// </summary>
static Hashtable htmimes = new Hashtable();
internal readonly string AllowExt = “.jpe|.jpeg|.jpg|.png|.tif|.tiff|.bmp|.gif“;

public XImage()
{
tBackground = Color.Transparent;
tBorder = Color.Transparent;
tShadow = Color.Transparent;
tQuality = 100;
markPosition = “左下角“;

#region 图片类型预定义
htmimes[“.jpe“]=“image/jpeg“;
htmimes[“.jpeg“] = “image/jpeg“;
htmimes[“.jpg“] = “image/jpeg“;
htmimes[“.png“] = “image/png“;
htmimes[“.tif“] = “image/tiff“;
htmimes[“.tiff“] = “image/tiff“;
htmimes[“.bmp“] = “image/bmp“;
htmimes[“.gif“] = “image/gif“;
#endregion
}

#region 下载指定URL图片并保存

/// <summary>
/// 下载指定URL的文件并保存到指定目录
/// </summary>
/// <param name=“strUrl“></param>
public void DownloadImage(string strUrl, string file)
{
System.Net.WebClient wc = new System.Net.WebClient();
wc.DownloadFile(strUrl, file);
}

#endregion

#region C#自动生成缩略图

/// <summary>
/// 按给定名字确定颜色
/// </summary>
/// <param name=“name“></param>
/// <returns></returns>
public Color ToColor(string name)
{
if (name == “白色“) return Color.White;
if (name == “红色“) return Color.Red;
if (name == “蓝色“) return Color.Blue;
if (name == “绿色“) return Color.Green;
if (name == “黑色“) return Color.Black;
if (name == “灰色“) return Color.DarkGray;
if (name == “黄色“) return Color.Yellow;
if (name == “紫色“) return Color.Cyan;
if (name == “无色“) return Color.Transparent;
return Color.Transparent;
}

/// <summary>
/// 按名字设置各种颜色，可以自行扩充:)
/// </summary>
/// <param name=“name“></param>
/// <returns></returns>
public int ToQuality(string name)
{
return Int32.Parse(name.Replace(“%“, ““));
}

/// <summary>
/// 获取图像编码解码器的所有相关信息
/// </summary>
/// <param name=“mimeType“>包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param>
/// <returns>返回图像编码解码器的所有相关信息</returns>
private static ImageCodecInfo GetCodecInfo(string mimeType)
{
ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo ici in CodecInfo)
{
if (ici.MimeType == mimeType) return ici;
}
return null;
}

/// <summary>
/// 检测扩展名的有效性
/// </summary>
/// <param name=“sExt“>文件名扩展名</param>
/// <returns>如果扩展名有效,返回true,否则返回false.</returns>
private bool CheckValidExt(string sExt)
{
bool flag = false;
string[] aExt = AllowExt.Split(“|“);
foreach (string filetype in aExt)
{
if (filetype.ToLower() == sExt)
{
flag = true;
break;
}
}
return flag;
}

/// <summary>
/// 保存图片
/// </summary>
/// <param name=“image“>Image 对象</param>
/// <param name=“savePath“>保存路径</param>
/// <param name=“ici“>指定格式的编解码参数</param>
private void SaveImage(System.Drawing.Image image, string savePath, ImageCodecInfo ici)
{
//设置原图片对象的 EncoderParameters 对象
EncoderParameters parameters = new EncoderParameters(1);
parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)tQuality));
image.Save(savePath, ici, parameters);
parameters.Dispose();
}

/// <summary>
/// 生成缩略图
/// </summary>
/// <param name=“sourceImagePath“>原图片路径(相对路径)</param>
/// <param name=“thumbnailImagePath“>生成的缩略图路径,如果为空则保存为原图片路径(相对路径)</param>
/// <param name=“thumbnailImageWidth“>缩略图的宽度（高度与按源图片比例自动生成）</param>
public void ToThumbnail(string sourceImagePath, string thumbnailImagePath, int thumbnailImageWidth, int thumbnailImageHeight )
{
// 1.先检查图片格式等信息
string ThumbnailImagePath = thumbnailImagePath;
string SourceImagePath = sourceImagePath;
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(“.“)).ToLower();
if (SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException(“SourceImagePath is null!“);
}
if (!CheckValidExt(sExt))
{
throw new ArgumentException(“原图片文件格式不正确,支持的格式有[ “ + AllowExt + “ ]“, “SourceImagePath“);
}

// 从原图片创建 Image 对象
System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));

// 2.计算图片的位置、尺寸等信息
int tWidth, tHeight, tLeft, tTop;
double fScale = (double)thumbnailImageHeight / (double)thumbnailImageWidth; // 高度宽度比
if (((double)image.Width * fScale) > (double)image.Height) // 如果原图比较宽
{
tWidth = thumbnailImageWidth;
tHeight = (int)((double)image.Height * (double)tWidth / (double)image.Width);
tLeft = 0;
tTop = (thumbnailImageHeight-tHeight)/2;
}
else
{
tHeight = thumbnailImageHeight;
tWidth = (int)((double)image.Width * (double)tHeight / (double)image.Height);
tLeft = (thumbnailImageWidth-tWidth)/2;
tTop = 0;
}
if (tLeft < 0) tLeft = 0;
if (tTop < 0) tTop = 0;

if (tBorder != Color.Transparent)
{
tWidth -= 2;
tHeight -= 2;
tLeft++;
tTop++;
}

if (tShadow != Color.Transparent)
{
tWidth -= 1;
tHeight -= 1;
}

//用指定的大小和格式初始化 Bitmap 类的新实例
//Bitmap bitmap = new Bitmap(ThumbnailImageWidth, num, PixelFormat.Format32bppArgb);
Bitmap bitmap = new Bitmap(thumbnailImageWidth, thumbnailImageHeight, PixelFormat.Format32bppArgb);

//从指定的 Image 对象创建新 Graphics 对象
Graphics graphics = Graphics.FromImage(bitmap);

//清除整个绘图面并以透明背景色填充
if (tBackground != Color.Transparent)
{
graphics.Clear(tBackground);
}
else
{
graphics.Clear(Color.Transparent);
}

// 添加阴影
if (tShadow != Color.Transparent)
{
Pen shPen = new Pen(tShadow);
graphics.DrawLine(shPen, new Point(1, thumbnailImageHeight-1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1));
graphics.DrawLine(shPen, new Point(thumbnailImageWidth-1, 1), new Point(thumbnailImageWidth-1, thumbnailImageHeight-1));
}

// 添加边框
if (tBorder != Color.Transparent)
{
Pen bdPen = new Pen(tBorder);
if (tShadow != Color.Transparent)
{
graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-2, thumbnailImageHeight-2));
}
else
{
graphics.DrawRectangle(bdPen, new Rectangle(0, 0, thumbnailImageWidth-1, thumbnailImageHeight-1));
}
}

//在指定位置并且按指定大小绘制原图片对象
graphics.DrawImage(image, new Rectangle(tLeft, tTop, tWidth, tHeight));

image.Dispose();
try
{
//将此原图片以指定格式并用指定的编解码参数保存到指定文件
string savepath = (ThumbnailImagePath == null ? SourceImagePath : ThumbnailImagePath);
SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}

#endregion

#region C#给图片添加水印

public void Mark(string sourceImagePath, string markString)
{
// 1.先检查图片格式等信息
string markImagePath = sourceImagePath;
string SourceImagePath = sourceImagePath;
string sExt = SourceImagePath.Substring(SourceImagePath.LastIndexOf(“.“)).ToLower();
if (SourceImagePath.ToString() == System.String.Empty)
{
throw new NullReferenceException(“SourceImagePath is null!“);
}
if (!CheckValidExt(sExt))
{
throw new ArgumentException(“原图片文件格式不正确,支持的格式有[ “ + AllowExt + “ ]“, “SourceImagePath“);
}

// 从原图片创建 Image 对象
System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath(SourceImagePath));

//用指定的大小和格式初始化 Bitmap 类的新实例
Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format32bppArgb);

//从指定的 Image 对象创建新 Graphics 对象
Graphics graphics = Graphics.FromImage(bitmap);

//在指定位置并且按指定大小绘制原图片对象
graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height));

#region 绘制水印

// 设置水印字体
int fHeight = image.Height/5;
if(fHeight>16) fHeight = 16;
Font drawFont = new Font(“Arial“, fHeight);

// 设置水印文字位置，默认为左下角
float x = 4;
float y = image.Height - drawFont.Height - 4;
if (markPosition == “左上角“)
{
y = 4;
}
if (markPosition == “右上角“)
{
x = image.Width - markString.Length * fHeight / 2 - fHeight;
y = 4;
}
if (markPosition == “右下角“)
{
x = image.Width - markString.Length * fHeight / 2 - fHeight;
}
if (markPosition == “图片中间“)
{
x = image.Width / 2 - markString.Length * fHeight / 2;
y = image.Height / 2 - fHeight / 2;
}

StringFormat drawFormat = new StringFormat();
drawFormat.FormatFlags = StringFormatFlags.NoWrap;

// 设置水印文字颜色，先绘制一个黑色字作为阴影，再绘制白色字，这样比较显眼；
SolidBrush drawBrush = new SolidBrush(Color.Black);
graphics.DrawString(markString, drawFont, drawBrush, x, y, drawFormat);
drawBrush.Color = Color.White;
graphics.DrawString(markString, drawFont, drawBrush, x-1, y-1, drawFormat);

#endregion

image.Dispose();
try
{
//将此原图片以指定格式并用指定的编解码参数保存到指定文件
string savepath = SourceImagePath;
SaveImage(bitmap, HttpContext.Current.Server.MapPath(savepath), GetCodecInfo((string)htmimes[sExt]));
}
catch (System.Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}

}

#endregion

}
}

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原文地址：https://www.cnblogs.com/superstar/p/5090213.html