前台：
<body>
<form name="form1" method="post" runat="server">
<div align="center"><BR>
<span id="Message" runat="server"></span>
<asp:Label id="Label2" runat="server">图片文件：</asp:Label>
<INPUT id="File1" type="file" name="File1" runat="server"> <input id="Submit1" type="submit" value="上传" name="Submit" runat="server">
<BR>
<br>
<asp:Label id="Label1" runat="server">允许上传的类型：jpg,gif大小限制：1M。</asp:Label>
</div>
</form>
</body>
后台
private void Submit1_ServerClick(object sender, System.EventArgs e)
{
string fileextention = Path .GetExtension(File1.PostedFile.FileName);
string aa = DateTime.Now.ToString().Replace(":","").Replace("-","").Replace(" ","");
string filename = aa + fileextention;
string filepath = Server.MapPath("uploadimg/" + filename);
string filetype = File1.PostedFile.ContentType.ToString();//获取上传文件的类型
if(filetype != "image/pjpeg" && filetype != "image/gif")//判断是不是gif或是jpg图象文件
{
Message.InnerHtml = "只允许上传*.gif和*.jpg图片文件！";
Message.Style["Color"]="red";
return;
}
filepath1 = "...." + filename;
Session["filepath1"] = filepath1;//将上传的图片路径暂时保存
if(File.Exists(filepath))
{
Message.InnerHtml = "上传文件重名，请改名后再上传！";
Message.Style["Color"] = "red";
return;
}
else
{
if(File1.PostedFile != null)
try
{
File1.PostedFile.SaveAs(filepath);
Message.InnerHtml = "<b>成功上传！</b>";
Label2.Visible = false;
File1.Visible = false;
Submit1.Visible = false;
Label1.Text = "<a href=# onclick=Addpic('"+filepath1+"');><font color=red>点击这里添加到编辑器中</font></a>";
}
catch(Exception exc)
{
Message.InnerHtml = "保存文件时出错<b>" + filepath + "</b><br>"+ exc.ToString();
}
}