ASP.NET+C#环境中FileUpload控件的使用方法

本例是用该控件上传图片，上传其它附件依此类推

前台就随便拖一个FileUpload控件和一个button控件

    <asp:FileUpload ID="FileUpload1" runat="server" /><br />
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />

后台

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class Manage_News_upload : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            string fileExrensio = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();//ToLower转化为小写
            string FileType = FileUpload1.PostedFile.ContentType;
            string UploadURL = Server.MapPath("~/upload/");//上传的目录
            if (FileType == "image/bmp" || FileType == "image/gif" || FileType == "image/jpeg" || FileType == "image/jpg" || FileType == "image/png")//判断文件类型
            {

                try
                {
                    if (!System.IO.Directory.Exists(UploadURL))//判断文件夹是否已经存在
                    {
                        System.IO.Directory.CreateDirectory(UploadURL);//创建文件夹
                    }

                    FileUpload1.PostedFile.SaveAs(UploadURL + FileUpload1.FileName);
                }
                catch 
                {
                    Response .Write ("失败");
                }
            }
            else
            {
                Response.Write("格式错误");
            }
        }
        else 
             Response.Write("请选择文件");
    }
}