C# 将位图转换为图像

Convert Bitmap to Image

提问by Jake

So after I pull an image out of DLL and put it into an image control it is a BitmapImage. To package it back into the dll it has to be converted back to an image. How can I convert it back to image and how can i repackage it back into the dll? This is all in wpf written in c#.

因此，在我从 DLL 中提取图像并将其放入图像控件后，它是一个 BitmapImage。要将其打包回 dll，必须将其转换回图像。如何将其转换回图像以及如何将其重新打包回 dll？这都是用c#编写的wpf。

private void compileDLL_Click(object sender, RoutedEventArgs e)
    {
        string sourcePath = Directory.GetCurrentDirectory() + "\PCAngelResources.dll";
        //destination path
        string dllname = textBox1.Text + "_PCAngelResources.dll";
        string targetPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        string destFile = System.IO.Path.Combine(targetPath, dllname);
        System.IO.File.Copy(sourcePath, destFile, true);

        //lstImages = new Dictionary<string, Bitmap>();
        //string filename = "PCAngelResources.dll";
        Assembly pcangdll = Assembly.LoadFile(sourcePath);
        System.Globalization.CultureInfo culture = Thread.CurrentThread.CurrentCulture;
        ResourceManager rm = new ResourceManager("PCAngelResources.DynResources", pcangdll);
        rs = rm.GetResourceSet(culture, true, true);
        ResourceWriter writer = new ResourceWriter(destFile);

        foreach (DictionaryEntry resource in rs)
        {
            resources.Add((string)resource.Key);
            if (resource.Key.Equals("Branding") || resource.Key.Equals("Advertising"))
            {
                if (resource.Key.Equals("Branding"))
                {
                    writer.AddResource("Branding", image5.Source);
                    //System.Object obj = rm.GetObject((string)resource.Key);
                    //lstImages.Add((string)resource.Key, (Bitmap)obj);
                }
                else
                    if (resource.Key.Equals("Advertising"))
                    {
                        writer.AddResource("Advertising", image6.Source);
                    }
            }
        }
        writer.Generate();
        System.Windows.MessageBox.Show("Done", "Process Finished", MessageBoxButton.OK, MessageBoxImage.Asterisk, MessageBoxResult.OK);
    }

When I do writer.Generate() to make the new dll I get the following error: An unhandled exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll

当我执行 writer.Generate() 来制作新的 dll 时，我收到以下错误： mscorlib.dll 中发生了类型为“System.Runtime.Serialization.SerializationException”的未处理异常

Additional information: Type 'System.Windows.Media.Imaging.BitmapFrameDecode' in Assembly 'PresentationCore, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' is not marked as serializable.

附加信息：在程序集“PresentationCore，版本=3.0.0.0，文化=中性，PublicKeyToken=31bf3856ad364e35”中键入“System.Windows.Media.Imaging.BitmapFrameDecode”未标记为可序列化。

回答by Charlie

I don't know what you mean by "repackage it back into the DLL" but there is an easy way to convert a WPF image from a BitmapSource back into a System.Drawing.Image. The following method accomplishes that:

我不知道“将它重新打包回 DLL”是什么意思，但是有一种简单的方法可以将 WPF 图像从 BitmapSource 转换回 System.Drawing.Image。以下方法实现了这一点：

/// <summary>
/// Converts a WPF bitmap to a System.Drawing.Bitmap
/// </summary>
/// <param name="wpfBitmap">BitmapSource to convert</param>
/// <returns>A GDI Bitmap</returns>
public static System.Drawing.Bitmap GdiBitmapFromWpfBitmap(BitmapSource wpfBitmap)
{
    PngBitmapEncoder encoder = new PngBitmapEncoder();
    encoder.Frames.Add(BitmapFrame.Create(wpfBitmap));
    MemoryStream imageStream = new MemoryStream();
    encoder.Save(imageStream);
    System.Drawing.Bitmap gdiBitmap = new System.Drawing.Bitmap(imageStream);

    imageStream.Close();
    imageStream.Dispose();

    return gdiBitmap;
}