将 ListBox 绑定到静态列表并创建 DataTemplate

Question

我使用静态成员列表创建了以下类：

public class Role
{
    public static List<Role> AllRoles = new List<Role>()
    {
        Administrators,
        PowerUsers,
        Limited
    };

    public static Role Administrators = new Role() { Name = "Bob" };
    public static Role PowerUsers = new Role() { Name = "Jimbo" };
    public static Role Limited = new Role() { Name = "Jack" };

    public string Name { get; set; }
}

现在我正在尝试在 ListBox 中使用基于每个属性的项目模板绑定到它。我无法让绑定工作，它不返回值。

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WPFTests">

    <Grid>
        <ListBox Width="200" Height="200"
                 ItemsSource="{Binding Source={x:Static local:Role.AllRoles}}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <CheckBox Content="{Binding Path=Name}" />
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

我一定错过了一些简单的东西。我得到 3 个复选框来表示一个由 3 个成员组成的数组，但我没有得到任何绑定到公共属性的结果。

Answer 1

如果你像这样重新排列你的代码，它会起作用：

public class Role 
{ 
    public static List<Role> AllRoles = new List<Role>() 
    { 
        Administrators, 
        PowerUsers, 
        Limited 
    }; 

    public static Role Administrators = new Role() { Name = "Bob" }; 
    public static Role PowerUsers = new Role() { Name = "Jimbo" }; 
    public static Role Limited = new Role() { Name = "Jack" }; 

    public string Name { get; set; } 
} 

您不应依赖初始化静态字段的特定顺序。根据http://msdn.microsoft.com/en-us/library/aa645758(v=vs.71).aspx，静态字段初始化的顺序是不确定的。

使用静态构造函数，代码可能更具可读性：

public class Role
{
    public static Role Administrators;
    public static Role PowerUsers;
    public static Role Limited;

    public static List<Role> AllRoles;

    static Role()
    {
        Administrators = new Role() {Name = "Bob"};
        PowerUsers = new Role() {Name = "Jimbo"};
        Limited = new Role() {Name = "Jack"};

        AllRoles = new List<Role>()
            {
                Administrators,
                PowerUsers,
                Limited
            };
    }

    public string Name { get; set; }
}