WPF显示网络图片的几种方法

1、利用数据流

Image img;
byte[] btyarray = GetImageFromResponse(imageUrl);
 
//字节数据转流
MemoryStream ms = new MemoryStream(btyarray);
 
//重点：设置Image控件的Source为流格式的图片数据
img.Source = BitmapFrame.Create(ms, BitmapCreateOptions.None, BitmapCacheOption.Default);
 
 
//从图片地址获取图片字节数据
public byte[] GetImageFromResponse(string url, string cookie = null)
{
        try
        {
                System.Net.WebRequest request = System.Net.WebRequest.Create(url);
                if (!string.IsNullOrWhiteSpace(cookie))
                {
                        request.Headers[System.Net.HttpRequestHeader.Cookie] = cookie;
                }
 
                System.Net.WebResponse response = request.GetResponse();
 
                using (Stream stream = response.GetResponseStream())
                {
                        using (MemoryStream ms = new MemoryStream())
                        {
                                Byte[] buffer = new Byte[1024];
                                int current = 0;
                                do
                                {
                                        ms.Write(buffer, 0, current);
                                } while ((current = stream.Read(buffer, 0, buffer.Length)) != 0);
                                return ms.ToArray();
                        }
                }
        }
        catch (Exception ex)
        {
                Console.WriteLine(ex.Message);
                //throw new Exception(ex.Message);
                return null;
        }
}

2、利用BitmapImage

BitmapImage bitImage = new BitmapImage();
bitImage.BeginInit();
bitImage.UriSource = new Uri(imageUrl, UriKind.Absolute);
bitImage.EndInit();
img.Source = bitImage;

总结

两种方式都用过了，觉得第一种好点，因为第一种可以判断是否加载成功，这样可以做后续操作