将ListBox绑定到静态列表并创建DataTemplate [英] Binding a ListBox to a static list and creating a DataTemplate

问题描述

我创建了一个静态成员列表的类：

I created the following class with a static list of members:

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; }
}

现在我试图在ListBox中绑定一个项目基于每个模板的属性。我不能让绑定工作，它不返回值。

Now I'm trying to bind to it in a ListBox with an item template based on the properties of each. I cannot get the binding to work, it doesn't return the values.

<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>

我一定是缺少一些简单的东西。我得到3个复选框来表示一个3个成员的数组，但是我没有得到任何绑定到公共属性的结果。

I must be missing something simple. I am getting 3 checkboxes to represent an array of 3 members, but I'm not getting any results for binding to public properties.

推荐答案

p>如果你重新排列这样的代码，它可以正常工作：

If you rearrange your code like this, it works:

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; } 
} 

您不应该依赖静态字段初始化的特定顺序。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未定义的。

You should not rely on a specific order in which the static fields are initialized. According to http://msdn.microsoft.com/en-us/library/aa645758(v=vs.71).aspx, the order of static field initialization is undefined.

可能代码将是更可读的静态构造函数：

Probably the code would be more readable with a static constructor:

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; }
}

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