在.NET中利用XMLHTTP下载文件_LINQ | ASP.NET 3.5 | SilverLight2 | MVC

利用XMLHTTP下载文件，和以前的方法一样，先添加引用－COM－Microsoft Xml 3.0，并且在服务器上使用时要把 Interop.MSXML2.dll 也放在Bin下。然后在代码开始处写：

ASPX 代码

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
  string Url = TextBox1.Text;
  string StringFileName = Url.Substring(Url.LastIndexOf("/") + 1);
  string StringFilePath = Request.PhysicalApplicationPath;
  if (!StringFilePath.EndsWith("/")) StringFilePath += "/";
  MSXML2.XMLHTTP _xmlhttp = new MSXML2.XMLHTTPClass();
  _xmlhttp.open("GET", Url, false, null, null);
  _xmlhttp.send("");
  if (_xmlhttp.readyState == 4)
  {
    if (System.IO.File.Exists(StringFilePath + StringFileName))
      System.IO.File.Delete(StringFilePath + StringFileName);
    System.IO.FileStream fs = new System.IO.FileStream(StringFilePath + StringFileName, System.IO.FileMode.CreateNew);
    System.IO.BinaryWriter w = new System.IO.BinaryWriter(fs);
    w.Write((byte[])_xmlhttp.responseBody);
    w.Close();
    fs.Close();
    Response.Write("文件已经得到。<br><a href='" + VirtualPathUtility.ToAbsolute("~/") + StringFileName + "' target='_blank'>");
    Response.Write("查看" + StringFileName + "</a>");
  }
  else
  {
    Response.Write(_xmlhttp.statusText);
  }
  Response.End();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
  <title></title>
</head>
<body>
  <form id="form1" runat="server">请输入一个图片地址：<br />
  <asp:TextBox ID="TextBox1" runat="server"
    Text="http://dotnet.aspx.cc/Images/logoSite.gif" Width="822px"></asp:TextBox>
  <br />
<br />
  <asp:Button ID="Button1" runat="server" Text="获取图片" onclick="Button1_Click" />
  </form>
</body>
</html>