asp.net文件上传类代码,Asp.Net代码库,德仔网

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代码分类
【Asp.Net】 asp.net文件上传类
作者: / 发布于2010/12/31/ 616
这是Asp.net文件上传类(取得文件后缀名,保存文件,加入文字水印)的详细页面，介绍了和asp.net,有关的知识、技巧、经验，和一些asp.net源码
<div>using system; 
using system.data; 
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.drawing; 
using system.io; 
using system.drawing.imaging;</div>
<div>namespace ec 
{ 
/// <summary> 
/// 上传类 
/// </summary> 
public class uploadobj 
{</div>
<div>public uploadobj() 
{ 
// 
// todo: 在此处添加构造函数逻辑 
// 
} 
/// <summary> 
/// 允许文件上传的类型枚举 
/// </summary> 
public enum filetype 
{ 
jpg,gif,bmp,png 
}
<div>region 取得文件后缀 
/// <summary> 
/// 取得文件后缀 
/// </summary> 
/// <param name="filename">文件名称</param> 
/// <returns></returns> 
public static string getfileextends(string filename) 
{ 
string ext = null; 
if (filename.indexof('.') > 0) 
{ 
string[] fs = filename.split('.'); 
ext = fs[fs.length - 1]; 
} 
return ext; 
} 
#endregion</div>
<div>region 检测文件是否合法 
/// <summary> 
/// 检测上传文件是否合法 
/// </summary> 
/// <param name="fileextends">文件后缀名</param> 
/// <returns></returns> 
public static bool checkfileextends(string fileextends) 
{ 
bool status = false; 
fileextends = fileextends.tolower(); 
string[] fe = enum.getnames(typeof(filetype)); 
for (int i = 0; i < fe.length; i++) 
{ 
if (fe[i].tolower() == fileextends) 
{ 
status = true; 
break; 
} 
} 
return status; 
} 
#endregion</div>
<div>region 保存文件 
/// <summary> 
/// 保存文件 
/// </summary> 
/// <param name="fpath">全路径,server.mappath()</param> 
/// <param name="myfileupload">上传控件</param> 
/// <returns></returns> 
public static string photosave(string fpath,fileupload myfileupload) 
{ 
string s = ""; 
string fileextends = ""; 
string filename = myfileupload.filename; 
if (filename != "") 
{ 
//取得文件后缀 
fileextends = ec.uploadobj.getfileextends(filename); 
if (!ec.uploadobj.checkfileextends(fileextends)) 
{ 
ec.messageobject.showpre("上传文件类型不合法"); 
} 
random rd = new random(); 
s = ec.randomobject.daterndname(rd) + "." + fileextends; 
string file = fpath + "\\" + s; 
try 
{ 
myfileupload.saveas(file); 
} 
catch (exception ee) 
{ 
throw new exception(ee.tostring()); 
} 
} 
return s; 
}
<div>endregion</div>
<div>region 加入文字水印</div>
<div>/// <summary> 
/// 加入文字水印 
/// </summary> 
/// <param name="filename">文件名称路径(全路径)</param> 
/// <param name="text">文件</param> 
public void addtexttoimg(string filename, string text) 
{ 
if (!file.exists(filename)) 
{ 
throw new filenotfoundexception("文件不存在"); 
} 
if (text == string.empty) 
{ 
return; 
} 
//判断文件类型是否为图像类型</div>
<div>system.drawing.image image = system.drawing.image.fromfile(filename); 
bitmap bitmap = new bitmap(image, image.width, image.height); 
graphics g = graphics.fromimage(bitmap); 
float fontsize = 12.0f;//字体大小 
float textwidth = text.length * fontsize;//文本的长度 
//下面定义一个矩形区域,以后在这个矩形里面画上白底黑字 
float rectx = 0; 
float recty = 0; 
float rectwidth = text.length * (fontsize + 8); 
float rectheight = fontsize + 8; 
//声明矩形域 
rectanglef textarea = new rectanglef(rectx, recty, rectwidth, rectheight); 
font font = new font("宋体", fontsize);//定义字体 
brush whitebrush = new solidbrush(color.white);//白笔刷,画文字用 
brush blackbrush = new solidbrush(color.black);//黑笔刷，画背景用 
g.fillrectangle(blackbrush, rectx, recty, rectwidth, rectheight); 
g.drawstring(text, font, whitebrush, textarea); 
memorystream ms = new memorystream(); 
bitmap.save(ms, imageformat.jpeg); 
//输出处理后的图像，这里为了演示方便，我将图片显示在页面中了 
//response.clear(); 
//response.contenttype = "image/jpeg"; 
//response.binarywrite(ms.toarray()); 
g.dispose(); 
bitmap.dispose(); 
image.dispose(); 
} 
#endregion 
} 
}
<div></div>
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