Funzionamento dei file immagine, byte[] e BitmapImage in WPF

Piccola feccia · Pubblicato su 16/12/2015 17:00:21

public MainWindow()
{
InitializeComponent();
byte[] b = GetPictureData(@"F:\WPF\TestSolution\TestReatByteFromDB\Images\123.png");
BitmapImage myimg = ByteArrayToBitmapImage(b);
this.testImg.Source = myimg;
}
public byte[] GetPictureData(string imagepath)
{
/**/
////根据图片文件的路径使用文件流打开，并保存为byte[]
FileStream fs = new FileStream(imagepath, FileMode.Open);//可以是其他重载方法
byte[] byData = new byte[fs.Length];
fs.Read(byData, 0, byData.Length);
fs.Close();
return byData;
}
public BitmapImage ByteArrayToBitmapImage(byte[] byteArray)
{
BitmapImage bmp = null;
try
{
bmp = new BitmapImage();
bmp.BeginInit();
bmp.StreamSource = new MemoryStream(byteArray);
bmp.EndInit();
}
catch
{
bmp = null;
}
return bmp;
}
public byte[] BitmapImageToByteArray(BitmapImage bmp)
{
byte[] byteArray = null;
try
{
Stream sMarket = bmp.StreamSource;
if (sMarket != null && sMarket.Length > 0)
{
//很重要，因为Position经常位于Stream的末尾，导致下面读取到的长度为0。
sMarket.Position = 0;
using (BinaryReader br = new BinaryReader(sMarket))
{
byteArray = br.ReadBytes((int)sMarket.Length);
}
}
}
catch
{
//other exception handling
}
return byteArray;
}

Copia codice

[WPF] Funzionamento dei file immagine, byte[] e BitmapImage in WPF