Create PNG image with C# HttpHandler webservice

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我在风中等你
我在风中等你 2020-12-05 11:46

I\'d like to be able to create a simple PNG image, say of a red square using a c# web based service to generate the image, called from an

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  •  春和景丽
    2020-12-05 12:07

    A web service is not suitable for this. It returns a message in a specific format, typically SOAP, so it can't be an image.

    Use a regular web form instead, where you remove all markup except the @page directive. Use the BinaryWrite method to write the image data to the response stream.

    Example:

    byte[] imageData;
    using (Bitmap image = new Bitmap(10,10)) {
       using (Graphics g = Graphics.FromImage(image)) {
          g.Clear(Color.Red);
       }
       using (MemoryStream m = new MemoryStream()) {
          image.Save(m, ImageFormat.Png);
          imageData = m.ToArray();
       }
    }
    Response.ContentType = "image/png";
    Response.BinaryWrite(imageData);
    

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