Question

我使用枚举来填充我的ListView项目。

填充后我希望在onclick后得到特定的usercontrol，使用Enum标记或其他内容。

我使用Description指定项目名称。但我还想为每个Enum绑定他的UserControl。

我想这样做（伪代码）：

onClick(object sender, Args....){
ItemXY foo = sender as ItemXY
this.UserControl = foo.getUserControl();
...
}

我的枚举：

 public enum UserControlsEnum
{
    [Description("Cash")]
    Cash     =   0,
    [Description("History")]
    Velocity =   1,
    [Description("Statistik")]
    Statistik =   2,
    [Description("Information")]
    Info        =   3,
    [Description("Administration")]
    Admin       =   4,
    [Description("About")]
    About       =   5
}

我的问题是：

是否有像Description这样的标签将特定视图的名称设置为字符串，甚至更好地直接设置特定视图？

喜欢：

    [Description("Cash")]
 -->[Tag("ItemView.xaml")]
    Cash     =   0,

Answer 1

这应该有效：

public sealed class ViewTagAttribute : Attribute
{
    /// <summary>
    /// Constructor
    /// </summary>
    /// <param name="viewType"></param>
    public ViewTagAttribute(System.Type viewType)
    {
        this.type = viewType;
    }

    /// <summary>
    /// Create an instance of the associated view
    /// </summary>
    /// <returns></returns>
    public static View CreateViewInstanceForEnumValue<T>(T enumValue)
    {
        var attributes = typeof(T).GetField(enumValue.ToString()).GetCustomAttributes(true);
        var viewAttr = (from a in attributes where a is ViewTagAttribute select (ViewTagAttribute)a).FirstOrDefault();

        if (viewAttr != null)
            return System.Activator.CreateInstance(viewAttr.type) as View;

        return null;
    }

    /// <summary>
    /// Associated view type
    /// </summary>
    private readonly System.Type type;
}

然后，您可以使用ViewTag属性为每个枚举成员设置控件，例如：

public enum UserControlsEnum
{
    [Description("Cash")]
    [ViewTag(typeof(View1))]
    Cash = 0,

    [Description("History")]
    [ViewTag(typeof(View2))]
    Velocity = 1,

    [Description("Statistik")]
    [ViewTag(typeof(View3))]
    Statistik = 2,

    [Description("Information")]
    [ViewTag(typeof(View1))]
    Info = 3,

    [Description("Administration")]
    [ViewTag(typeof(View1))]
    Admin = 4,

    [Description("About")]
    [ViewTag(typeof(View1))]
    About = 5
}

然后您可以使用以下内容创建视图：

this.UserControl = (UserControl)ViewTagAttribute.CreateViewInstanceForEnumValue(foo);

WPF UserControl使用枚举标记导航

1 个答案: