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

Convert System.Drawing.Bitmap to WPF BitmapImage

Converting an existing System.Drawing.Bitmap to a WPF BitmapImage requires a compatible format in order for the WPF application to display the image correctly. An efficient method is to convert the Bitmap to a MemoryStream and then use the BeginInit() and EndInit() methods of BitmapImage. Here are detailed instructions for achieving this:

First, create a MemoryStream instance and save the System.Drawing.Bitmap into it using the appropriate ImageFormat. In this example we will use PNG:

<code class="language-csharp">using(MemoryStream memory = new MemoryStream())
{
    bitmap.Save(memory, ImageFormat.Png);</code>

Next, reset the MemoryStream's position to the beginning of the stream to ensure that BitmapImage can read the image data:

<code class="language-csharp">    memory.Position = 0;</code>

Now, create a new BitmapImage instance and call its BeginInit() method. This method initializes BitmapImage and prepares it to load image data.

<code class="language-csharp">    BitmapImage bitmapImage = new BitmapImage();
    bitmapImage.BeginInit();</code>

Set the StreamSource property of BitmapImage to the memory stream created previously. This property allows BitmapImage to read image data from the stream.

<code class="language-csharp">    bitmapImage.StreamSource = memory;</code>

To optimize performance, set the CacheOption of BitmapImage to BitmapCacheOption.OnLoad. This option caches image data into memory after the image is initially loaded, thereby improving subsequent retrieval performance.

<code class="language-csharp">    bitmapImage.CacheOption = BitmapCacheOption.OnLoad;</code>

Finally, call the EndInit() method of BitmapImage to complete the loading process. This method validates the image data and makes it available for display.

<code class="language-csharp">    bitmapImage.EndInit();
}</code>

By following these steps, you can successfully convert System.Drawing.Bitmap to System.Windows.Media.Imaging.BitmapImage that can be used in WPF applications.

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