【C#/WPF】Bitmap、BitmapImage、ImageSource 、byte[]转换问题

C#/WPF项目中，用到图像相关的功能时，涉及到多种图像数据类型的相互转换问题，这里做了个整理。包含的内容如下：

Bitmap和BitmapImage相互转换。
RenderTargetBitmap –> BitmapImage
ImageSource –> Bitmap
BitmapImage和byte[]相互转换。
byte[] –> Bitmap

StackOverflow上有很多解决方案，这里选择了试过可行的方法：

Bitmap和BitmapImage相互转换
谷歌上搜关键字 C# WPF Convert Bitmap BitmapImage

// Bitmap --> BitmapImage
public static BitmapImage BitmapToBitmapImage(Bitmap bitmap)
{using (MemoryStream stream = new MemoryStream()){bitmap.Save(stream, ImageFormat.Png); // 坑点：格式选Bmp时，不带透明度stream.Position = 0;BitmapImage result = new BitmapImage();result.BeginInit();// According to MSDN, "The default OnDemand cache option retains access to the stream until the image is needed."// Force the bitmap to load right now so we can dispose the stream.result.CacheOption = BitmapCacheOption.OnLoad;result.StreamSource = stream;result.EndInit();result.Freeze();return result;}
}// BitmapImage --> Bitmap
public static Bitmap BitmapImageToBitmap(BitmapImage bitmapImage)
{// BitmapImage bitmapImage = new BitmapImage(new Uri("../Images/test.png", UriKind.Relative));using (MemoryStream outStream = new MemoryStream()){BitmapEncoder enc = new BmpBitmapEncoder();enc.Frames.Add(BitmapFrame.Create(bitmapImage));enc.Save(outStream);Bitmap bitmap = new Bitmap(outStream);return new Bitmap(bitmap);}
}

RenderTargetBitmap –> BitmapImage

// RenderTargetBitmap --> BitmapImage
public static BitmapImage ConvertRenderTargetBitmapToBitmapImage(RenderTargetBitmap wbm)
{BitmapImage bmp = new BitmapImage();using (MemoryStream stream = new MemoryStream()){BmpBitmapEncoder encoder = new BmpBitmapEncoder();encoder.Frames.Add(BitmapFrame.Create(wbm));encoder.Save(stream);bmp.BeginInit();bmp.CacheOption = BitmapCacheOption.OnLoad;bmp.CreateOptions = BitmapCreateOptions.PreservePixelFormat;bmp.StreamSource = new MemoryStream(stream.ToArray()); //stream;bmp.EndInit();bmp.Freeze();}return bmp;
}// RenderTargetBitmap --> BitmapImage
public static BitmapImage RenderTargetBitmapToBitmapImage(RenderTargetBitmap rtb)
{var renderTargetBitmap = rtb;var bitmapImage = new BitmapImage();var bitmapEncoder = new PngBitmapEncoder();bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));using (var stream = new MemoryStream()){bitmapEncoder.Save(stream);stream.Seek(0, SeekOrigin.Begin);bitmapImage.BeginInit();bitmapImage.CacheOption = BitmapCacheOption.OnLoad;bitmapImage.StreamSource = stream;bitmapImage.EndInit();}return bitmapImage;
}

ImageSource –> Bitmap

// ImageSource --> Bitmap
public static System.Drawing.Bitmap ImageSourceToBitmap(ImageSource imageSource)
{BitmapSource m = (BitmapSource)imageSource;System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(m.PixelWidth, m.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb); // 坑点：选Format32bppRgb将不带透明度System.Drawing.Imaging.BitmapData data = bmp.LockBits(new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);m.CopyPixels(Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);bmp.UnlockBits(data);return bmp;
}

BitmapImage和byte[]相互转换

// BitmapImage --> byte[]
public static byte[] BitmapImageToByteArray(BitmapImage bmp)
{byte[] bytearray = null;try{Stream smarket = bmp.StreamSource; ;if (smarket != null && smarket.Length > 0){//设置当前位置smarket.Position = 0;using (BinaryReader br = new BinaryReader(smarket)){bytearray = br.ReadBytes((int)smarket.Length);}}}catch (Exception ex){Console.WriteLine(ex);}return bytearray;
}// byte[] --> BitmapImage
public static BitmapImage ByteArrayToBitmapImage(byte[] array)
{using (var ms = new System.IO.MemoryStream(array)){var image = new BitmapImage();image.BeginInit();image.CacheOption = BitmapCacheOption.OnLoad; // hereimage.StreamSource = ms;image.EndInit();image.Freeze();return image;}
}

byte[] –> Bitmap

public static System.Drawing.Bitmap ConvertByteArrayToBitmap(byte[] bytes)
{System.Drawing.Bitmap img = null;try{if (bytes != null && bytes.Length != 0){MemoryStream ms = new MemoryStream(bytes);img = new System.Drawing.Bitmap(ms);}}catch (Exception ex){Console.WriteLine(ex);}return img;
}

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