基本上我试图在 ASP.NET 处理程序中呈现一个简单的图像:
public void ProcessRequest (HttpContext context)
{
Bitmap image = new Bitmap(16, 16);
Graphics graph = Graphics.FromImage(image);
graph.FillEllipse(Brushes.Green, 0, 0, 16, 16);
context.Response.ContentType = "image/png";
image.Save(context.Response.OutputStream, ImageFormat.Png);
}
但我得到以下异常:
System.Runtime.InteropServices.ExternalException: A generic error
occurred in GDI+.
at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder,
EncoderParameters encoderParams)
解决方案是使用它而不是将图像写入 OutputStream:
MemoryStream temp = new MemoryStream();
image.Save(temp, ImageFormat.Png);
byte[] buffer = temp.GetBuffer();
context.Response.OutputStream.Write(buffer, 0, buffer.Length);
所以我只是好奇为什么第一个变体有问题?
编辑:HRESULT 是 80004005,它只是“通用”。