C# wpf导出图片

using System.Windows.Media.Imaging;

using System.Windows.Media;

using System.IO;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Forms;

using Microsoft.Win32;

namespace WpfApplication1

{

    class ImageOutput

    {

        public void GetImageFromControl(System.Windows.Controls.Control control)

        {

            ///第一步：建立DrawingVisual,将Control转换为DrawingVisual

            DrawingVisual drawingVisual = new DrawingVisual();

            using (DrawingContext context = drawingVisual.RenderOpen())

            {

                VisualBrush brush = new VisualBrush(control) { Stretch = Stretch.None };

                context.DrawRectangle(brush, null, new Rect(0, 0, control.Width, control.Height));

                context.Close();

            }

            ///第二步:建立RenderTargetBitmap，将DrawingVisual转化为RenderTargetBitmap

            //dpi可以自己设定   // 获取dpi方法：PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice 

            RenderTargetBitmap bitmap = new RenderTargetBitmap((int)control.Width, (int)control.Height, 96, 96, PixelFormats.Pbgra32);

            bitmap.Render(drawingVisual);

 

            ///第三步:使用SaveFileDialog获得保存路径

            ///

            bool flag = false;

            folders = OpenRegistryPath(Registry.CurrentUser, @"/Software/Microsoft/Windows/CurrentVersion/Explorer/Shell Folders");

            string picturesPath = folders.GetValue("Desktop").ToString();

 

            string imagFile = "";

            System.Windows.Forms.SaveFileDialog saveFileDialog = new System.Windows.Forms.SaveFileDialog();

            saveFileDialog.Filter = "PNG文件(*.png)|*.png|JPG文件(*.jpg)|*.jpg|BMP文件(*.bmp)|*.bmp|GIF文件(*.gif)|*.gif|TIF文件(*.tif)|*.tif";

            saveFileDialog.InitialDirectory = picturesPath;

            if (saveFileDialog.ShowDialog() == DialogResult.OK)

            {

                flag = true;

                imagFile = saveFileDialog.FileName;

            }

 

            ///第四步:创建BitmapEncoder，保存图片

            if (flag)

            {

                string extensionString = Path.GetExtension(imagFile);

                BitmapEncoder encoder = null;

                switch (extensionString)

                {

                    case ".jpg":

                        encoder = new JpegBitmapEncoder();

                        break;

                    case ".png":

                        encoder = new PngBitmapEncoder();

                        break;

                    case ".bmp":

                        encoder = new BmpBitmapEncoder();

                        break;

                    case ".gif":

                        encoder = new GifBitmapEncoder();

                        break;

                    case ".tif":

                        encoder = new TiffBitmapEncoder();

                        break;

                    default:

                        throw new InvalidOperationException();

 

                }

                encoder.Frames.Add(BitmapFrame.Create(bitmap));

                using (Stream stm = File.Create(imagFile))

                {

                    encoder.Save(stm);

                }

            }

        }

        private RegistryKey folders;

        private RegistryKey OpenRegistryPath(RegistryKey root, string s)

        {

            s = s.Remove(0, 1) + @"/";

            while (s.IndexOf(@"/") != -1)

            {

                root = root.OpenSubKey(s.Substring(0, s.IndexOf(@"/")));

                s = s.Remove(0, s.IndexOf(@"/") + 1);

            }

            return root;

        }

    }

}

以上代码的使用方法为：

ImageOutput imageOutput  = new ImageOutput();

imageOutput.GetImageFromControl(“界面上的用户控件，可以是自定义的UserControl，也可以是一般的控件（如TextBox,Label等）,但不能是Grid和Canvas，可能是它们和Control不在同一个命名空间，且不能相互转化”);

转载于:https://www.cnblogs.com/guotian-/p/6428672.html