wpf 读取网络图片

wpf读取网络图片：

private void ViewImage(string fileUri)
{
BitmapImage bitImage = new BitmapImage();
bitImage.BeginInit();
bitImage.UriSource = new Uri(fileUri, UriKind.Absolute);
bitImage.DecodePixelWidth = 300;
bitImage.EndInit();
imgView.Source = bitImage;
}

/// <summary>
        ///  根据图片文件的路径使用文件流打开，并保存为byte[] 
        /// </summary>
        /// <param name="imagepath"></param>
        /// <returns></returns>
        static public byte[] GetPictureData(string imagepath)
        {

            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;
        }


        static 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;
        }     
   static public BitmapImage GetBitImage(Uri uri)
        {
            BitmapImage bmp = new BitmapImage();
            bmp.DecodePixelHeight = 250; // 确定解码高度，宽度不同时设置
            bmp.BeginInit();
            // 延迟，必要时创建
            bmp.CreateOptions = BitmapCreateOptions.DelayCreation;
            bmp.CacheOption = BitmapCacheOption.OnLoad;
            bmp.UriSource = uri;
            bmp.EndInit(); //结束初始化
            return bmp;
        }

参考：

https://www.cnblogs.com/lonelyxmas/p/12164922.html

https://www.cnblogs.com/tcjiaan/p/5532104.html