How Do I Convert a System.Drawing.Bitmap to a WPF BitmapImage?

Converting a System.Drawing.Bitmap to a WPF BitmapImage

This article explains how to seamlessly integrate images from System.Drawing (often used in Windows Forms applications) into a WPF application. The key is converting a System.Drawing.Bitmap object into a System.Windows.Media.Imaging.BitmapImage.

The Solution: Using MemoryStream

The most efficient method uses a MemoryStream as an intermediary to transfer the image data.

Code Example:

<code class="language-csharp">using (MemoryStream memory = new MemoryStream()) {
    bitmap.Save(memory, ImageFormat.Png); // Save as PNG for broad compatibility
    memory.Position = 0; // Reset stream position
    BitmapImage bitmapImage = new BitmapImage();
    bitmapImage.BeginInit();
    bitmapImage.StreamSource = memory;
    bitmapImage.CacheOption = BitmapCacheOption.OnLoad; // Optimize caching
    bitmapImage.EndInit();
}</code>

Step-by-Step Breakdown:

1. Create a MemoryStream: A MemoryStream acts as a temporary storage for the image data.
2. Save the Bitmap: The System.Drawing.Bitmap (referred to as bitmap) is saved into the MemoryStream using the ImageFormat.Png format. PNG is a widely supported format, ensuring compatibility.
3. Reset Stream Position: The memory.Position = 0; line resets the stream's position to the beginning, preparing it for reading by the BitmapImage.
4. Create a BitmapImage: A new BitmapImage object is created to hold the WPF-compatible image.
5. Begin Initialization: bitmapImage.BeginInit(); starts the initialization process.
6. Set Stream Source: The MemoryStream is assigned as the StreamSource for the BitmapImage.
7. Set Cache Option: BitmapCacheOption.OnLoad optimizes caching, improving performance.
8. End Initialization: bitmapImage.EndInit(); completes the initialization, making the bitmapImage ready for use in your WPF application.

This process ensures a smooth conversion, allowing you to readily display System.Drawing bitmaps within your WPF environment.

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