如何根据XML属性创建数据模板？ [英] How to create a data template dependent on an XML Attribute?

问题描述

我正在编写一个WPF接口，读取XML文件并显示数据。 XML文件将是这样的：

 < People> 
< Person Gender =Male> 
< Name> Joe< / Name> 
< / Person> 
< Person Gender =Female> 
< Name> Susan< / Name> 
< / Person> 
< / People> 
  

我需要一个取决于Person的Gender属性的数据模板。此数据模板用于列表框项目。列表框的来源是People。

 < DataTemplate DataType =Person [@ Gender ='Male']> 
< / DataTemplate> 
< DataTemplate DataType =Person [@ Gender ='Female']> 
< / DataTemplate> 
  

我以为这会像上面的代码一样，但不行。任何想法？

谢谢！

ANSWER

以下是上述XML示例的DataTemplateSelector：

  public class MyDataTemplateSelector：DataTemplateSelector 
 {
 private DataTemplate _MaleTemplate = null; 
 private DataTemplate _FemaleTemplate = null; 
 
 public DataTemplate MaleTemplate 
 {
 get {return _MaleTemplate; } 
 set {_MaleTemplate = value; } 
} 
 public DataTemplate FemaleTemplate 
 {
 get {return _FemaleTemplate; } 
 set {_FemaleTemplate = value; 
} 
 
 public override DataTemplate SelectTemplate（object item，DependencyObject container）
 {
 XmlElement currentNode =（XmlElement）item; 
 DataTemplate selectedTemplate = null; 
 string selectedGender =; 
 
 selectedGender = currentNode.GetAttribute（Gender）; 
 
开关（selectedGender）
 {
 caseMale：
 selectedTemplate = _MaleTemplate; 
 break; 
 
 case女：
 selectedTemplate = _FemaleTemplate; 
 break; 
 
默认值：
 break; 
} 
 
 return selectedTemplate; 
} 
} 
  

感谢您的帮助！我希望这对其他人也是有用的！

解决方案

您需要使用 DataTemplateSelector 。 WPF博士的文章表明了这一点完全是你正在寻找的。

I'm working on a WPF interface that reads an XML file and displays the data. The XML file would be something like this:

<People>
    <Person Gender="Male">
        <Name>Joe</Name>
    </Person>
    <Person Gender="Female">
        <Name>Susan</Name>
    </Person>
</People>

I need a data template dependent on the Gender attribute of Person. This data template is for list box items. the source of the listbox is People.

<DataTemplate DataType="Person[@Gender='Male']">
</DataTemplate>
<DataTemplate DataType="Person[@Gender='Female']">
</DataTemplate>

I thought it would be something like the above line of code, but it doesn't work. Any ideas?

Thanks!

ANSWER
Here's the DataTemplateSelector for the above XML example:

public class MyDataTemplateSelector : DataTemplateSelector
{
    private DataTemplate _MaleTemplate = null;
    private DataTemplate _FemaleTemplate = null;

    public DataTemplate MaleTemplate
    {
        get { return _MaleTemplate; }
        set { _MaleTemplate = value; }
    }
    public DataTemplate FemaleTemplate
    {
        get { return _FemaleTemplate; }
        set { _FemaleTemplate = value; }
    }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        XmlElement currentNode = (XmlElement)item;
        DataTemplate selectedTemplate = null;
        string selectedGender = "";

        selectedGender = currentNode.GetAttribute("Gender");

        switch (selectedGender)
        {
            case "Male":
                selectedTemplate = _MaleTemplate;
                break;

            case "Female":
                selectedTemplate = _FemaleTemplate;
                break;

            default:
                break;
        }

        return selectedTemplate;
    }
}

Thanks for the help! I hope this will be useful to someone else as well!

解决方案

You need to use a DataTemplateSelector. This article by Dr. WPF demonstrates it completely and is just what you are looking for.

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