Unable to download file in asp.net

Question

I am trying to download the file from the repeater. Following is my code:

protected void DownloadFile(object sender, EventArgs e)
    {
        string filePath = (sender as LinkButton).CommandArgument;
        Response.ContentType = ContentType;
        Response.AppendHeader("Content-Disposition", "attachment; filename=" + HttpContext.Current.Server.MapPath("~/Data/") + filePath);
        Response.WriteFile(filePath);
        Response.End();
    }

I am receiving the following exception:

The file is saved in the Data folder of the route folder:

How do I write the code to find the actual path?

Answer 1

看起来您的文件路径不正确（./College/Graphic1.jpg），与屏幕截图中显示的路径（./Data/Graphic1.jpg）不匹配

Answer 2

I solved my question. I changed my code to the following code:

protected void DownloadFile(object sender, EventArgs e)
    {
        WebClient req = new WebClient();
        string filePath = (sender as LinkButton).CommandArgument;
        Response.ContentType = ContentType;
        HttpResponse response = HttpContext.Current.Response;
        string file = Server.MapPath("~/Data/") + filePath;
        response.Clear();
        response.ClearContent();
        response.ClearHeaders();
        response.Buffer = true;
        response.AddHeader("Content-Disposition", "attachment;filename="+filePath);
        byte[] data = req.DownloadData(file);
        response.BinaryWrite(data);
        response.End();
    }