ASP.NET文件的上传与下载

（1）上传文件前台：

<table align="center" cellpadding="0" cellspacing="0" width="100%">

                <tr>

                    <td align="right">文件名称：</td>

                    <td>

                        <asp:TextBox ID="FileName" runat="server"></asp:TextBox>

                    </td>

                    <td></td>

                </tr>  

                <tr>

                    <td align="right">浏览：</td>

                    <td>

                        <asp:FileUpload ID="FileUpload1" runat="server" />

                    </td>

                    <td></td>

                </tr>   

                <tr>

                    <td></td>

                    <td>

                        <asp:Button ID="UploadButton" runat="server" Text="上传" 

                            onclick="UploadButton_Click" /><asp:Label ID="Msg" runat="server" ForeColor="#FF0000"></asp:Label>     

                    </td>

                    <td></td>

                </tr>               

        </table>

上传文件后台：

protected void UploadButton_Click(object sender, EventArgs e)

        {

            Msg.Text = "";

            MyWebSite.DAL.FileInfo file = new MyWebSite.DAL.FileInfo();

            if (string.IsNullOrEmpty(FileName.Text))

            {

                Msg.Text = "请输入文件名";

                return;

            }

            if (FileUpload1.HasFile)

            {

                try

                {

 

                    DateTime upload = DateTime.Now;

                    string flag = Path.GetExtension(FileUpload1.PostedFile.FileName);

                    string path = Server.MapPath("../Upload/" + FileUpload1.FileName);

                    string size = (FileUpload1.PostedFile.ContentLength / 1024).ToString();

                    FileUpload1.SaveAs(path);

                    file.FileName = FileName.Text.ToString();

                    file.Type = flag;//获得文件格式

                    file.Size = size;//文件大小

                    file.FilePath = path;//上传到服务器的绝对路径

                    file.UploadTime = DateTime.Now.ToShortDateString();//上传时间

                    handler.AddFile(file);//将上传的文件信息保存到数据库

                    Msg.Text = "上传成功！";

                }

                catch

                {

 

                    Msg.Text = "上传失败！";

                }

            }

        }

(2)下载文件前台：

<asp:Repeater ID="Repeater1" runat="server" onitemcommand="down_file_Click">

    <ItemTemplate>       

          <table width="90%" align="center" border="1" cellpadding="1" cellspacing="0" bgcolor="#e1e1e1" class="title_font">

           <tr>

                <td class="title_font" width="10%"  align="center">文件名称：</td>

                <td width="20%"align="center"><b><asp:Label ID="FileTitle" runat="server" Text='<%#Eval("文件名称") %>'></asp:Label></b></td>

                <td  width="6%"align="center">类型：</td>

                <td width="6%"align="center"><%#Eval("类型") %></td>                

                <td width="10%" align="center">文件大小：</td>

                <td  width="8%"align="center"><%#Eval("文件大小") %>KB</td>

                <td width="10%"align="center">上传时间：</td>

                <td ><%#Eval("上传时间") %></td>

                <td  width="10%" colspan="2" align="center"><asp:LinkButton ID="LinkButton1" CommandArgument='<%#Eval("link") %>' runat="server">下载文件</asp:LinkButton>

                </td>

            </tr>           

        </table>

        <br />

    </ItemTemplate>

</asp:Repeater>

下载文件后台（绑定数据）

public void GrvDataBin(List<FileInfo> list)

        {

 

            DataView dv = new DataView();

            DataTable dt = new DataTable("fileMeta");

            {

                dt.Columns.Add("文件名称");

                dt.Columns.Add("类型");

                dt.Columns.Add("上传时间");

                dt.Columns.Add("文件大小");

                dt.Columns.Add("link");

            }

            foreach (FileInfo fileM in list)

            {

                DataRow row = dt.NewRow();

                row[0] = fileM.FileName;

                row[1] = fileM.Type;

                row[2] = fileM.UploadTime;

                row[3] = fileM.Size;

                row[4] = fileM.FilePath;

                dt.Rows.Add(row);

            }

            dv.Table = dt;

            Repeater1.DataSource = dv;

            Repeater1.DataBind();

 

        }

下载文件后台（下载）

protected void down_file_Click(object sender, RepeaterCommandEventArgs e)

        {

            System.IO.FileStream fs = null;

            try

            {

                string filePath = e.CommandArgument.ToString();

                string fileName = ((Label)e.Item.FindControl("FileTitle")).Text.ToString();

                fs = System.IO.File.OpenRead(filePath);

                byte[] buffer = new byte[1024];

                long count = 1024;

                Response.Buffer = true;

                Response.AddHeader("Connection", "Keep-Alive");

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

                Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(System.IO.Path.GetFileName(filePath)));//下载时要保存的默认文件名

                Response.AddHeader("Content-Length", fs.Length.ToString());

                while (count == 1024)

                {

                    count = fs.Read(buffer, 0, 1024);

                    Response.BinaryWrite(buffer);

                }

 

            }

            catch (Exception ex)

            {

                return;

            }

            finally

            {

                fs.Close();

            }

        }