工单 修复 微信复制图片上传不展示的bug

OrderSupportTicket/ViewModels/PendingAttachmentViewModel.cs

@@ -207,7 +207,7 @@ public sealed class PendingAttachmentViewModel : BindableBaseEx, IDisposable
 				Path.GetTempPath(),
 				"WxOrder-Clipboard-" + Guid.NewGuid().ToString("N") + ".png");
 			var encoder = new PngBitmapEncoder();
-			encoder.Frames.Add(BitmapFrame.Create(bitmap));
+			encoder.Frames.Add(BitmapFrame.Create(NormalizeClipboardBitmap(bitmap)));
 			using (var stream = File.Create(filePath))
 				encoder.Save(stream);
 
@@ -236,6 +236,29 @@ public sealed class PendingAttachmentViewModel : BindableBaseEx, IDisposable
 		}
 	}
 
+	private static BitmapSource NormalizeClipboardBitmap(BitmapSource bitmap)
+	{
+		if (bitmap.Format != PixelFormats.Bgra32 && bitmap.Format != PixelFormats.Pbgra32)
+			return bitmap;
+
+		var stride = checked(bitmap.PixelWidth * 4);
+		var pixels = new byte[checked(stride * bitmap.PixelHeight)];
+		bitmap.CopyPixels(pixels, stride, 0);
+		for (var i = 3; i < pixels.Length; i += 4)
+		{
+			if (pixels[i] != 0)
+				return bitmap;
+		}
+
+		// 微信等截图工具可能将 DIB 的保留字节全部置零，WPF 将其解释为 Alpha。
+		// 直接按 Bgr32 使用原始颜色，避免预乘 Alpha 转换时丢失 RGB；正常透明图保持原样。
+		var normalized = BitmapSource.Create(
+			bitmap.PixelWidth, bitmap.PixelHeight, bitmap.DpiX, bitmap.DpiY,
+			PixelFormats.Bgr32, null, pixels, stride);
+		normalized.Freeze();
+		return normalized;
+	}
+
 	public void Dispose()
 	{
 		if (_disposed)

OrderSupportTicket/Views/TicketComposerView.xaml.cs

@@ -14,16 +14,52 @@ public partial class TicketComposerView : UserControl
 
 	private void ChatTextBox_PreviewKeyDown(object sender, KeyEventArgs e)
 	{
-		var isPaste = (e.Key == Key.V && Keyboard.Modifiers == ModifierKeys.Control) || (e.Key == Key.Insert && Keyboard.Modifiers == ModifierKeys.Shift);
-		if (!isPaste || DataContext is not OrderSupportTicketViewModel viewModel) return;
+		var isPaste = (e.Key == Key.V && Keyboard.Modifiers == ModifierKeys.Control)
+				   || (e.Key == Key.Insert && Keyboard.Modifiers == ModifierKeys.Shift);
+		if (!isPaste || DataContext is not OrderSupportTicketViewModel viewModel)
+		{
+			return;
+		}
+
 		IDataObject data;
-		try { data = Clipboard.GetDataObject(); } catch (ExternalException) { return; }
-		if (data == null) return;
-		if (data.GetDataPresent(DataFormats.Bitmap) && data.GetData(DataFormats.Bitmap) is BitmapSource bitmap) { viewModel.AddPendingImage(bitmap); e.Handled = true; return; }
-		if (!data.GetDataPresent(DataFormats.FileDrop) || data.GetData(DataFormats.FileDrop) is not string[] files) return;
-		var images = files.Where(path => PendingAttachmentViewModel.TryGetMimeType(System.IO.Path.GetExtension(path), out _)).ToArray();
-		if (images.Length == 0) return;
+		try
+		{
+			data = Clipboard.GetDataObject();
+		}
+		catch (ExternalException)
+		{
+			return;
+		}
+
+		if (data == null)
+		{
+			return;
+		}
+
+		if (data.GetDataPresent(DataFormats.Bitmap)
+			&& data.GetData(DataFormats.Bitmap) is BitmapSource bitmap)
+		{
+			viewModel.AddPendingImage(bitmap);
+			e.Handled = true;
+			return;
+		}
+
+		if (!data.GetDataPresent(DataFormats.FileDrop)
+			|| data.GetData(DataFormats.FileDrop) is not string[] files)
+		{
+			return;
+		}
+
+		var images = files
+			.Where(path => PendingAttachmentViewModel.TryGetMimeType(System.IO.Path.GetExtension(path), out _))
+			.ToArray();
+
+		if (images.Length == 0)
+		{
+			return;
+		}
+
 		viewModel.AddPendingImages(images);
 		e.Handled = true;
 	}
-}
+}