图像到byte []，Convert和ConvertBack [英] Image to byte[], Convert and ConvertBack

问题描述

我有一项服务，可以将网站上存储的图像转换为字节数组

  HttpWebRequest myRequest =（HttpWebRequest）WebRequest.Create （ URLTOIMAGE）; 
 myRequest.Method =GET; 
 HttpWebResponse myResponse =（HttpWebResponse）myRequest.GetResponse（）; 
位图bmp =新位图（myResponse.GetResponseStream（））; 
 myResponse.Close（）; 
 ms = new MemoryStream（）; 
 bmp.Save（ms，ImageFormat.Bmp）; 
  

此代码返回一个存储在数据库（SQL Azure）中的字节数组。在我的Windows Phone应用程序中，我尝试转换此字节数组以在我的页面上显示它。

  public class BytesToImageConverter：IValueConverter 
 {
公共对象转换（对象值，类型targetType，对象参数，System.Globalization.CultureInfo文化）
 {
 BitmapImage empImage = new BitmapImage（）; 
 empImage.SetSource（new MemoryStream（（Byte []）value））; 
返回empImage; 
} 
 
公共对象ConvertBack（对象值，类型targetType，对象参数，
 System.Globalization.CultureInfo文化）
 {
抛出新的NotImplementedException（ ）; 
} 
} 
  

字节数组很受应用程序的欢迎，但是当我尝试执行SetSource时抛出异常。

  empImage.SetSource（new MemoryStream（（Byte []）value） ）; 
 => 异常未处理，请求不受支持
  

你能帮助我吗？这个代码有效：

  public class BytesToImageConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
 MemoryStream stream = new MemoryStream（（Byte []）value）; 
 WriteableBitmap bmp = new WriteableBitmap（173,173）; 
 bmp.LoadJpeg（stream）; 
返回bmp; 
} 
 
公共对象ConvertBack（对象值，类型targetType，对象参数，
 System.Globalization.CultureInfo文化）
 {
抛出新的NotImplementedException（ ）; 
} 
} 
  

谢谢大家：）

I have a service that converts images stored on a website to byte array

                HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("URLTOIMAGE");
                myRequest.Method = "GET";
                HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
                Bitmap bmp = new Bitmap(myResponse.GetResponseStream());
                myResponse.Close();
                ms = new MemoryStream();
                bmp.Save(ms, ImageFormat.Bmp);

This code returns a byte array that I store in a database (SQL Azure). In my Windows Phone application, I try to convert this byte array to display it on my page.

public class BytesToImageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        BitmapImage empImage = new BitmapImage();
        empImage.SetSource(new MemoryStream((Byte[])value));
        return empImage;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
                                System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

The byte array is well received by the application, but an exception is thrown when I try to do a SetSource.

empImage.SetSource(new MemoryStream((Byte[])value));
=> "Exception was unhandled", The request is not supported

Can you help me? Thx

解决方案

This code works :

public class BytesToImageConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        MemoryStream stream = new MemoryStream((Byte[])value);
        WriteableBitmap bmp = new WriteableBitmap(173, 173);
        bmp.LoadJpeg(stream);
        return bmp;
    }

    public object ConvertBack(object value, Type targetType, object parameter,
                                System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Thank you everyone :)

这篇关于图像到byte []，Convert和ConvertBack的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！