FileUpload上传与下载

后台代码：

        public string connstr = "server=128.1.3.113;database=test;uid=sa;pwd=pass";
        protected void Page_Load(object sender, EventArgs e)
        {
            LoadData();
        }

        protected void BtnSave_Click(object sender, EventArgs e)
        {
            if (FileUpload1.HasFile)
            {
                string name = FileUpload1.FileName;
                string filepath = Server.MapPath("~/") + "upload\" + name;
                using (SqlConnection conn = new SqlConnection(connstr))
                {
                    conn.Open();
                    SqlCommand comm = conn.CreateCommand();
                    comm.CommandText = string.Format("insert into PathTable (Name,Path) values('{0}','{1}')",name,filepath);
                    int count = comm.ExecuteNonQuery();
                    if (count > 0)
                    {
                        FileUpload1.SaveAs(filepath);
                        LoadData();
                        Page.ClientScript.RegisterStartupScript(this.GetType(), "", "<script>alert('保存成功')</script>");
                    }
                    else 
                    {
                        ClientScript.RegisterStartupScript(this.GetType(),"","<script>alert('保存失败')</script>");
                    }
                }
            }
        }

        public void LoadData()
        {
            using (SqlConnection conn = new SqlConnection(connstr))
            {
                conn.Open();
                SqlCommand comm = conn.CreateCommand();
                comm.CommandText = "select * from PathTable";
                comm.ExecuteScalar();
                SqlDataAdapter adapter = new SqlDataAdapter(comm);
                DataSet ds = new DataSet();
                adapter.Fill(ds);
                GridView1.DataSource = ds.Tables[0];
                GridView1.DataBind();
            }
        }

        public static void DownloadFile(string physicalFilePath)
        {
            FileStream stream = null;
            try
            {
                stream = new FileStream(physicalFilePath, FileMode.Open, FileAccess.Read, FileShare.Read);
                int bufSize = (int)stream.Length;
                byte[] buf = new byte[bufSize];

                int bytesRead = stream.Read(buf, 0, bufSize);
                HttpContext.Current.Response.ContentType = "application/octet-stream";
                HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.IO.Path.GetFileName(physicalFilePath));
                HttpContext.Current.Response.OutputStream.Write(buf, 0, bytesRead);
                HttpContext.Current.Response.End();
            }
            finally
            {
                stream.Close();
            }
        }

        protected void LinkButton_Click(object sender, CommandEventArgs e)
        {
            if (e.CommandArgument!=null)
            {
                string path = e.CommandArgument.ToString();
                DownloadFile(path);
            }
        }

前台代码：

<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    </div>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False">
            <Columns>
                <asp:TemplateField HeaderText="编号">
                    <ItemTemplate>
                        <asp:Label ID="Id" Text='<%#Eval("Id") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="文件名">
                    <ItemTemplate>
                        <asp:Label ID="Name" Text='<%#Eval("Name") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="路径">
                    <ItemTemplate>
                        <asp:Label ID="Path" Text='<%#Eval("Path") %>' runat="server"></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="下载">
                    <ItemTemplate>
                        <asp:LinkButton Text="下载" runat="server" CommandArgument='<%#Eval("Path")%>' OnCommand="LinkButton_Click"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
        <p>
        <asp:FileUpload ID="FileUpload1" runat="server"/>
        </p>
        <p>
        <asp:Button ID="BtnSave" runat="server" Text="保存" OnClick="BtnSave_Click" />
        </p>
    </form>
</body>

注意：

1、GridView列中的TemplateField属性很实用，可以在其中添加其他发服务器控件、绑定事件和进行字段转换等；

2、设置CommandArgumet和OnCommand事件，可以在后台方便的获取绑定的字段；

3、Text='<%#Eval("Id")%>' 单引号内放双引号。