ChartToImage.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace FLY.Thick.Blowing.UI.Fix.Server
{
    public static class ChartToImage
    {
        public static void SaveToJpeg(FrameworkElement visual, string fileName)
        {
            var encoder = new JpegBitmapEncoder();
            EncodeVisual(visual, fileName, encoder);
        }

        static void EncodeVisual(FrameworkElement visual, string fileName, BitmapEncoder encoder)
        {
            var bitmap = new RenderTargetBitmap((int)visual.ActualWidth, (int)visual.ActualHeight, 96, 96, PixelFormats.Pbgra32);
            bitmap.Render(visual);
            var frame = BitmapFrame.Create(bitmap);

            encoder.Frames.Add(frame);
            using (var stream = File.Create(fileName)) encoder.Save(stream);
        }

    }
}