创建一个转换器以ID，并创建在Silverlight图像 [英] Creating a Converter to take an ID and create an Image in Silverlight

问题描述

我使用的是WCF气象服务和接收像ID，描述和图片天气信息。它返回这样的：

 < WeatherDescription> 
< WeatherID> 1 LT; / WeatherID> 
<说明与GT;雷霆风暴< /说明> 
< PictureURL> 
 http://ws.cdyne.com/WeatherWS/Images/thunderstorms.gif 
< / PictureURL> 
< / WeatherDescription> 
  

现在在XAML我显示我的数据在DataGrid像这样：

 < SDK：DataGridTextColumn标题=ID绑定={结合WeatherID}/> 
  

以上绑定到返回7天的天气预报服务的另一个功能，但返回相同的天气ID随着天气的说明工作。我创建了所有的天气说明的阵列上的代码方面，像这样：

 公共部分类的MainPage：用户控件
 {
 //天气描述
私人WeatherDescription数组[] weatherInformation; 
 
 WeatherSoapClient weatherClient =新WeatherSoapClient（）; 
 
公众的MainPage（）
 {
的InitializeComponent（）; 
 weatherClient.GetWeatherInformationCompleted + =新的EventHandler< GetWeatherInformationCompletedEventArgs>（weatherClient_GetWeatherInformationCompleted）; 
 weatherClient.GetWeatherInformationAsync（）; 
} 
 
无效weatherClient_GetWeatherInformationCompleted（对象发件人，GetWeatherInformationCompletedEventArgs E）
 {
 weatherInformation = e.Result; 
} 
} 
  

1. 什么我想要做的就是创建一个转换器，从该列取ID和使用天气的描述提供的URL将其转换为图像。




2. 我知道Silverlight不支持GIF的，所以我想是的图像发送到将其转换为JPG的处理程序。

作为全新的既Silverlight和C＃这些都是我真的有麻烦了两件事。感谢您的帮助提前！和代码片段是我最好的帮助，因为我不明白了很多的C＃呢。

解决方案

1. 有关转换器，你可以做这样的事情：

   
   
   

   < SDK：数据网格>

    < SDK：DataGrid.Resources> 
   <局部：WeatherIdToImageConverter键=IdToImageConverter/> 
   < / SDK：DataGrid.Resources> 
   ：
   < SDK：DataGridTemplateColumn> 
   < SDK：CellTemplate> 
   <&DataTemplate的GT; 
   <图像来源={结合WeatherID，转换器= {StaticResource的IdToImageConverter}}/> 
    ... 
     




2. 在您的实现转换器的，我会用ImageTools库（ http://imagetools.codeplex.com/ ），以GIF和PNG之间的转换（PNG会质量优于JPEG）。

I am using a WCF weather service and receiving weather information like ID, Description, and Images. It returns like this:

<WeatherDescription>
    <WeatherID>1</WeatherID>
    <Description>Thunder Storms</Description>
    <PictureURL>
     http://ws.cdyne.com/WeatherWS/Images/thunderstorms.gif
    </PictureURL>
</WeatherDescription>

Now in the XAML I am showing my data in a dataGrid as so:

<sdk:DataGridTextColumn Header="ID" Binding="{Binding WeatherID}" />

The above binding is to another function of the service that returns a 7 day forecast but returns the same weather ID that works with the weather description. I created an array of all the Weather Descriptions on the code side like so:

public partial class MainPage : UserControl
{
    //array of weather descriptions
    private WeatherDescription[] weatherInformation;

    WeatherSoapClient weatherClient = new WeatherSoapClient();

    public MainPage()
    {
        InitializeComponent();
        weatherClient.GetWeatherInformationCompleted += new EventHandler<GetWeatherInformationCompletedEventArgs>(weatherClient_GetWeatherInformationCompleted);
        weatherClient.GetWeatherInformationAsync();
    }

    void weatherClient_GetWeatherInformationCompleted(object sender, GetWeatherInformationCompletedEventArgs e)
    {
        weatherInformation = e.Result;
    }
}

1. What I want to do is create a converter that takes the ID from that Column and converts it to an image using the URL supplied in the weather descriptions.

2. I know Silverlight does not support GIF's so I would like to send that image to a handler that would convert it to a JPG.

Being brand new to both Silverlight and C# these are two things that I am really having trouble with. Thank you for the help in advance! And code snippets are the best help for me since I do not understand a lot of C# yet.

解决方案

1. For the converter, you can do something like this:

   <sdk:DataGrid>

   <sdk:DataGrid.Resources>
       <local:WeatherIdToImageConverter key="IdToImageConverter" />
   </sdk:DataGrid.Resources>
   ...
       <sdk:DataGridTemplateColumn>
          <sdk:CellTemplate>
              <DataTemplate>
                  <Image Source="{Binding WeatherID, Converter={StaticResource IdToImageConverter}}" />
                  ...
   

2. In your implementation of the converter, I would use the ImageTools library (http://imagetools.codeplex.com/) to convert between GIF and PNG (PNG will be better quality than JPEG).

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