如何在asp的datagridview中触发图像按钮的单击事件？

Question

我正在尝试使用asp在datagridview中使用图像按钮。 我有一个带有一些附件文件的数据集。 加载datagridview时，检查附件文件并添加一个imagebutton以下载该文件。 但是Click事件不会触发..

我正在使用rowdatabound：

protected void GridViewOutputs_RowDataBound(object sender, GridViewRowEventArgs e)
{
    int index = Convert.ToInt32(e.Row.RowIndex);
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        System.Diagnostics.Debug.WriteLine(e.Row.Cells[4].Text);
        int SelectedActivityID = Convert.ToInt32(e.Row.Cells[8].Text);

        List<AttachedFile> attachedFiles = new List<AttachedFile>();
        attachedFiles = Check_SelectedIndex_Attachment(SelectedActivityID);

        string fileName = "None";
        int fileIndex = 1;
        foreach (AttachedFile currentFile in attachedFiles)
        {
            fileName = currentFile.Name;
            System.Diagnostics.Debug.WriteLine(fileIndex + " : " + fileName);

            //ImageButton imgbtn = (ImageButton)e.Row.FindControl("imgbtn");
            ImageButton imgbtn = new ImageButton();
            imgbtn.ID = "imgbtn" + fileIndex;
            System.Diagnostics.Debug.WriteLine(imgbtn.ID.ToString());
            //imgbtn.Command += new CommandEventHandler(imgbtn_Command_Download);
            //imgbtn.Click += imgbtn_Click_Download;

            if (fileName.Contains("pdf"))
            {
                imgbtn.ImageUrl = "~/Images/pdf icon.png";

            }
            else if (fileName.Contains(".doc"))
            {
                imgbtn.ImageUrl = "~/Images/word icon.png";
            }
            else if (fileName.Contains(".ppt"))
            {
                imgbtn.ImageUrl = "~/Images/powerpoint icon.png";
            }
            else if (fileName.Contains(".xls"))
            {
                imgbtn.ImageUrl = "~/Images/excel icon.png";
            }
            else if (fileName.Contains(".vsd"))
            {
                imgbtn.ImageUrl = "~/Images/visio icon.png";
            }

            imgbtn.CommandName = fileName;
            imgbtn.ToolTip = fileName;
            e.Row.Cells[9].Controls.Add(imgbtn);
            fileIndex++;
        }
    }
}

我尝试了rowCommand（Onrowcommand）

protected void RowCommand(object sender, GridViewCommandEventArgs e)
{
    //if button is clicked
    string commandName = e.CommandName;
    System.Diagnostics.Debug.WriteLine(commandName);
    if (commandName == "Clicked")
    {
        //go find the index on the gridview
        int selectedIndex = GridViewOutputs.SelectedIndex;
        if (int.TryParse(e.CommandArgument.ToString(), out selectedIndex))
        {
            //do something with database
        }
    }
    if (commandName.Contains("."))
    {
        try
        {
            string fileName = commandName;
            System.Diagnostics.Debug.WriteLine(fileName);
            FileManager fileManager = new FileManager();
            AttachedFile file = fileManager.GetAttachedFileWithContentName(fileName);
            if (file.Bytes.Length > 0)
            {
                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                Response.ContentType = file.ContentType;
                Response.AppendHeader("Content-Disposition", "attachment; filename=" + file.Name);
                Response.BinaryWrite(file.Bytes);
                Response.Flush();
                Response.End();
            }
        }
        catch (Exception ex)
        { }
    }
}

我也尝试了Click事件

private void imgbtn_Click_Download(object sender, ImageClickEventArgs e)
{
    ImageButton imgbtn = (ImageButton)(sender);
    string commandName = imgbtn.CommandName;
    System.Diagnostics.Debug.WriteLine(commandName);
    if (commandName.Contains("."))
    {
        try
        {
            string fileName = commandName;
            System.Diagnostics.Debug.WriteLine(fileName);
            FileManager fileManager = new FileManager();
            AttachedFile file = fileManager.GetAttachedFileWithContentName(fileName);
            if (file.Bytes.Length > 0)
            {
                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                Response.ContentType = file.ContentType;
                Response.AppendHeader("Content-Disposition", "attachment; filename=" + file.Name);
                Response.BinaryWrite(file.Bytes);
                Response.Flush();
                Response.End();
            }
        }
        catch (Exception ex)
        { }
    }
}

我也尝试了Command事件

private void imgbtn_Command_Download(object sender, CommandEventArgs e)
{
    string commandName = e.CommandName;
    System.Diagnostics.Debug.WriteLine(commandName);
    if (commandName.Contains("."))
    {
        try
        {
            string fileName = e.CommandName;
            System.Diagnostics.Debug.WriteLine(fileName);
            FileManager fileManager = new FileManager();
            AttachedFile file = fileManager.GetAttachedFileWithContentName(fileName);
            if (file.Bytes.Length > 0)
            {
                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";
                Response.Cache.SetCacheability(HttpCacheability.NoCache);
                Response.ContentType = file.ContentType;
                Response.AppendHeader("Content-Disposition", "attachment; filename=" + file.Name);
                Response.BinaryWrite(file.Bytes);
                Response.Flush();
                Response.End();
            }
        }
        catch (Exception ex)
        { }
    }
}

显示图像按钮很麻烦，但是当我单击时，我无法使用。

请帮助我。