从WebRequest流创建ImageBrush

Question

我在从Stream创建ImageBrush时遇到了困难。下面的代码用于使用ImageBrush填充WPF Rectangle

        ImageBrush imgBrush = new ImageBrush();
        imgBrush.ImageSource = new BitmapImage(new Uri("\\image.png", UriKind.Relative));
        Rectangle1.Fill = imgBrush;

我想要做的是调用一个WebRequest并获取一个Stream。然后我想用Stream图像填充我的矩形。代码如下：

        ImageBrush imgBrush = new ImageBrush();
        WebRequest request = WebRequest.Create(iconurl);
        WebResponse response = request.GetResponse();
        Stream s = response.GetResponseStream();
        imgBrush.ImageSource = new BitmapImage(s);  // Here is the problem
        Rectangle1.Fill = imgBrush;

问题是我不知道如何使用response.GetResponseStream()设置我的imgBrush.ImageSource。如何在我的ImageBrush中使用Stream

Answer 1

BitmapImage constructors没有以Stream作为参数重载。

若要使用响应流，应使用无参数构造函数并设置StreamSource属性。

它看起来像这样：

// Get the stream for the image
WebRequest request = WebRequest.Create(iconurl);
WebResponse response = request.GetResponse();
Stream s = response.GetResponseStream();

// Load the stream into the image
BitmapImage image = new BitmapImage();
image.StreamSource = s;

// Apply image as source
ImageBrush imgBrush = new ImageBrush();
imgBrush.ImageSource = image;

// Fill the rectangle
Rectangle1.Fill = imgBrush;