Question

C#中用gridview实现下载功能，会的来 只要能解决，加分不成问题

前台代码：
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" AutoGenerateColumns="False"
DataSourceID="SqlDataSource1" Width ="100%" Height ="100%"
DataKeyNames="id" DataMember="DefaultView"
onrowcommand="GridView1_RowCommand1">
<Columns>
<asp:BoundField DataField="id" HeaderText="序号" InsertVisible="False"
ReadOnly="True" SortExpression="id" />
<asp:BoundField DataField="Name" HeaderText="文件名" SortExpression="Name" />
<asp:BoundField DataField="Typ" HeaderText="语言类型" SortExpression="Type2" />
<asp:BoundField DataField="Instr" HeaderText="文件简介" SortExpression="Instr" />
<asp:BoundField DataField="Time" HeaderText="上传时间" SortExpression="Time" />
<asp:ButtonField CommandName="Down" Text="下载" SortExpression="id"
ValidationGroup="id" />
</Columns>
<SelectedRowStyle ForeColor="#FF9999" > </asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT [id], [Name], [Typ], [Instr], [Time] FROM [Play]">
</asp:SqlDataSource>
后台代码：
int index = Convert.ToInt32(e.CommandArgument);
SqlConnection conn = new SqlConnection("Data Source=localhost;Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Best.mdf;Integrated Security=True;User Instance=True");
string sql = "select Name from [Play] where id=@index";
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@index", index.ToString());
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
string fileName = Convert.ToString(this.GridView1.Rows[0]);
string fileType = fileName.Substring(fileName.LastIndexOf(".") + 1);//得到文件的后缀名
string filePath = Server.MapPath("..\\Play\\Upload\\" + fileName + fileType); long fileSize = fileStream.Length + 100000;
HttpContext.Current.Response.ContentType = "application/octet-stream";
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=..\\Play\\Upload\"" + UTF_FileName(fileName) + fileType + "\";");
HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString());
byte[] fileBuffer = new byte[fileSize];
fileStream.Read(fileBuffer, 0, (int)fileSize);
HttpContext.Current.Response.BinaryWrite(fileBuffer);
fileStream.Close();
HttpContext.Current.Response.End();
这个问题积累好久，希望有热心的各位帮我搞定。问题就在于当点击下载时会出现另存为对话框但是不能正确读取文件名和类型，帮帮忙啊，由于代码比较多，提交时忘了选择分数，起步价50，封顶200，愿意帮忙的就帮吧

Answer 1

//下载文件时候调用方法
public static void FileDownload(string FileName)
{
String FullFileName = System.Web.HttpContext.Current.Server.MapPath(@"../test/" + FileName);
FileInfo DownloadFile = new FileInfo(FullFileName);
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.ClearHeaders();
System.Web.HttpContext.Current.Response.Buffer = false;
System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream";
System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.UTF8));
System.Web.HttpContext.Current.Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
System.Web.HttpContext.Current.Response.WriteFile(DownloadFile.FullName);
System.Web.HttpContext.Current.Response.Flush();
System.Web.HttpContext.Current.Response.End();
}
//用一个复选框选择然后获取文件名字
protected void Button2_Click(object sender, EventArgs e)
{
for (int i = 0; i < GridView1.Rows.Count; i++)
{
CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
if (cbox.Checked == true)
{
string name = GridView1.Rows[i].Cells[2].Text.ToString();
//Response.Write(name);
FileDownload(name);
}

}

}

追问

不行啊，又出现新的错误：编译器错误消息: CS0115: “ASP.play_download_aspx.GetTypeHashCode()”: 没有找到适合的方法来重写

行 1446: [System.Diagnostics.DebuggerNonUserCodeAttribute()]
行 1447: public override int GetTypeHashCode() {
行 1448: return -1536287560;
行 1449: }
这又是什么错误？帮忙解决啊，分不是问题呀

Answer 2

可以不用下载功能啊
呵呵
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