.Net 文件上传下载

public partial class _Default :System.Web.UI.Page

    {

      

        protectedvoid Page_Load(objectsender, EventArgs e)

        {

            if(!IsPostBack){

                stringisDownLoad = Request.QueryString["isDownLoad"];

                if(isDownLoad != null && "true".Equals(isDownLoad))

                {

                    //文件下载

 

                    stringfileName = Request.QueryString["fName"];

                    stringfilePath = Server.MapPath("/") + "\\Image\\Upload\\" + fileName;

                    FileInfofInfo = new FileInfo(filePath);

 

                    Response.Clear();

                    Response.ContentType = "application/octet-stream";

                    Response.ContentEncoding = Encoding.UTF8;

                    Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName, Encoding.UTF8));

                    Response.AppendHeader("Content-Length",fInfo.Length.ToString());

                   Response.WriteFile(filePath);

                    Response.Flush();

                   

                }

           

               

            }

        }

 

       

//文件上传

        protectedvoid btnUplaod_Click(objectsender, EventArgs e)

        {

            lblFileName.Text = "";

            if(fileUploadText.HasFile)

            {

                HttpPostedFilepostedFile = fileUploadText.PostedFile;

          

 

                stringfilePath = Server.MapPath("/")+"\\Image\\Upload\\";

                stringfilename = postedFile.FileName;

                if(filename.Contains("\\"))

                {

                    filename =filename.Substring(filename.LastIndexOf("\\")+1);

                }

                lblFileName.Text = filename;

                postedFile.SaveAs(filePath +filename);

            }

            else{

                Response.Write("<script>alert('请选择文件’')</script>");

            }

        }

 

        

//查询所有的待下载文件

 

        protectedvoid btn_searchDocument_Click(object sender, EventArgse)

        {

            stringfilePath = Server.MapPath(".")+"\\Image\\Upload\\";

            string[] files = Directory.GetFiles(filePath);

            foreach(string fileName infiles){

//截取路径是为了兼容火狐和IE

               string tempFileName =fileName.Substring(fileName.LastIndexOf("\\")+ 1);

                lblFile.Text += "<ahref='Default.aspx?isDownLoad=true&fName="+tempFileName+"'>"+tempFileName + "</a><br/>";

            }

        }

 

 

    }