ASP.NET：将Base64数据导出到Excel

我在ASP.NET中实现了一些网页。

我想导出一个图像（base64数据），以Excel。

这是我的代码片断，它使破碎的Excel文件。

像下面一样

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덽NG

IHDR뛬＆？IDAT？？ ？꾉1？X？铠？IEND췇`

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我怎么解决这个问题？

protected void btn_export_Click(object sender, EventArgs e) { string fileName = string.Format("File_{0}.xls", DateTime.Now); // red dot string data = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="; string base64Data = Regex.Match(data, @"data:image/(?<type>.+?),(?<data>.+)").Groups["data"].Value; byte[] binData = Convert.FromBase64String(base64Data); using (MemoryStream stream = new MemoryStream(binData)) { // it works well.. System.Drawing.Image image = new Bitmap(stream); image.Save(Server.MapPath("~/Images/file.png")); // Problem is occurred in excel file that make in here Response.Clear(); Response.Buffer = false; Response.AppendHeader("Content-Type", "application/xls"); Response.AppendHeader("Content-Transfer-Encoding", "binary"); Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName); Response.BinaryWrite(stream.ToArray()); Response.End(); } Response.End(); }