Windows Phone 7从代码中添加带有itemtemplate和datatemplate的列表框

Question

<ListBox x:Name="listBox">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Margin="10" >
                <TextBlock Text="{Binding title}"/>
                <TextBlock Text="{Binding Description}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

添加源代码的正确方法是什么?

编辑:

尝试:

public static DataTemplate createDataTemplate()
{
    return (DataTemplate)System.Windows.Markup.XamlReader.Load(
        @"<DataTemplate xmlns=""http://schemas.microsoft.com/client/2007"">
            <TextBlock Text=""{Binding Title}"" />
            <TextBlock Text=""{Binding Description}"" />
            <Image Source=""{Binding Image}"" />
      </DataTemplate>"
      );
}

当我调用这个时:

for (int i=0; i<10; i++) {
                ListBox lb      = new ListBox();
                lb.ItemTemplate = createDataTemplate();
                //...then add to a pivotitem
}

我明白了:

属性System.Windows.FrameworkTemplate。模板'被设置了不止一次。[Line: 3 Position: 32]

为什么?

Answer 1

你可以简单地在App.xaml文件的"Resources"元素下定义共享模板。

在App.xaml:

中定义

<DataTemplate x:Key="MySharedTemplate">
    <StackPanel Margin="10" >
        <TextBlock Text="{Binding title}"/>
        <TextBlock Text="{Binding Description}"/>
    </StackPanel>
</DataTemplate>

在代码中访问:

#region FindResource
/// <summary>Get a template by the type name of the data.</summary>
/// <typeparam name="T">The template type.</typeparam>
/// <param name="initial">The source element.</param>
/// <param name="type">The data type.</param>
/// <returns>The resource as the type, or null.</returns>
private static T FindResource<T>(DependencyObject initial, string key) where T : DependencyObject
{
    DependencyObject current = initial;
    if (Application.Current.Resources.Contains(key))
    {
        return (T)Application.Current.Resources[key];
    }
    while (current != null)
    {
        if (current is FrameworkElement)
        {
            if ((current as FrameworkElement).Resources.Contains(key))
            {
                return (T)(current as FrameworkElement).Resources[key];
            }
        }
        current = VisualTreeHelper.GetParent(current);
    }
    return default(T);
}
#endregion FindResource

在你的UI中使用它:

DataTemplate newTemplate = null;
string templateKey = "MySharedTemplate";
try { newTemplate = FindResource<DataTemplate>(this, templateKey); }
catch { newTemplate = null; }
if (newTemplate != null)
{
    this.ListBox1.ItemTemplate = newTemplate;
}