在 C# WPF 上将 ImageSource 转换为字符串

Question

ESRI Symbology library is slow and sometimes take longer time than expected.

I wish to serialize a selected range of ImageSource to a cache, string in the memory or file.

I have searched the web but not much on ImageSource.

An interesting thing I have found is "ImageSourceValueSerializer".

Being a 3 months old baby in WPF, I am not so sure how to go about this.

here's how I got the ImageSource:

MultilayerPointSymbol multiLayerSym = await result.GetSymbolAsync() as MultilayerPointSymbol;
RuntimeImage swatch = await multiLayerSym.CreateSwatchAsync();
ImageSource symbolImage = await swatch.ToImageSourceAsync();

Answer 1

Check if the ImageSource is a BitmapSource and encode the BitmapSource by one of the BitmapEncoders. Encode into a MemoryStream or a FileStream.

if (symbolImage is BitmapSource bitmapSource)
{
    var encoder = new PngBitmapEncoder();
    encoder.Frames.Add(BitmapFrame.Create(bitmapSource));

    using (var stream = new MemoryStream())
    {
        encoder.Save(stream);

        var bytes = stream.ToArray();
    }
}