关于文件的上传。

asp.net里的代码：

        <form id="Form1" method="post" runat="server" enctype="multipart/form-data">
            <input type="file" runat="server" id="UploadImage" name="UploadImage">
            <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
            <asp:Label id="lblMsg" runat="server" ForeColor="Red"></asp:Label>
        </form>

button的事件如下：

        private void Button1_Click(object sender, System.EventArgs e)
        {
            string all_filename,this_filename,ext_filename,new_filename;
            
            if(UploadImage.PostedFile.ContentLength==0)
            {
                this.lblMsg.Text="该文件不存在。";
            }
            else
            {
                all_filename=UploadImage.PostedFile.FileName;
                string[] a=all_filename.Split("\\".ToCharArray());
                this_filename=a[a.Length-1].ToString();
                ext_filename=this_filename.Remove(0,this_filename.LastIndexOf("."));
                new_filename=System.Guid.NewGuid()+ext_filename;

                UploadImage.PostedFile.SaveAs(Server.MapPath("/sourcefile") + @"\c1\" + new_filename);
                
            }
        }

以上是对单个文件的上传的方法，如果要同时实现多文件的上传。代码如下：
这是asp.net页面里的代码，注意新添加的file可以不需要id和name的

        <form id="Form1" method="post" encType="multipart/form-data" runat="server">
            <P><input id="UploadImage" type="file" name="UploadImage" runat="server"><br>
                <input type="file" runat="server"><br>
                <input type="file" runat="server"></P>
            <P>&nbsp;
                <asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
                <asp:Label id="lblMsg" runat="server" ForeColor="Red"></asp:Label></P>
        </form>

c#代码部分

        {
            for(int i=0;i<Request.Files.Count;i++)
            {
                System.Web.HttpPostedFile myfile=Request.Files[i];

                string all_filename,this_filename,ext_filename,new_filename;
            
                if(myfile.ContentLength!=0)
                {
                    all_filename=myfile.FileName;
                    string[] a=all_filename.Split("\\".ToCharArray());
                    this_filename=a[a.Length-1].ToString();
                    ext_filename=this_filename.Remove(0,this_filename.LastIndexOf("."));
                    new_filename=System.Guid.NewGuid()+ext_filename;

                    myfile.SaveAs(Server.MapPath("/sourcefile") + @"\c1\" + new_filename);
                }
            }

        }