WPF设计器自定义属性-下拉列表 [英] WPF designer custom properties - dropdown

问题描述

我想为WPF中的用户控件上的自定义属性提供一个下拉选择. 当我使用Enum作为属性时，一切正常:

I would like to have a drop down selection for a custom property on a User Control in WPF. Everything works fine when I use an Enum as the property:

/// <summary>
/// Interaction logic for Sample.xaml
/// </summary>
public partial class Sample : System.Windows.Controls.UserControl
{
    public Sample()
    {
        InitializeComponent();
    }

    [DefaultValue(Letters.A)]
    [Browsable(true)]
    [Category("ControlDisplay")]
    [Description("Letter")]
    public Letters Letter { get; set; }


    public enum Letters
    {
        A,
        B,
        C,
        D
    }
}

太好了:).

但是我想通过自定义类甚至是字符串来实现这一点. 我该怎么办?

But I want to achieve this for a custom class or even a string. How Should I do it?

谢谢.

推荐答案

最后得到了anwser(在挖掘了一些文档之后-很多). 首先是Type Converter属性 那么此处是一个不错的选择.

Finally got the anwser (after digging some documentation - a lot of it). First of all there is the Type Converter atribute then a nice walktrought how to implement it is here. This is what led me to it.

简而言之: 实现类型转换器GetStandardValuesSupported(ITypeDescriptorContext context)以返回true，而实现GetStandardValues(ITypeDescriptorContext context)以返回StandardValuesCollection作为属性类型. 最后，像这样装饰属性:

In a nutshell: Implement a type converter GetStandardValuesSupported(ITypeDescriptorContext context) to return true and GetStandardValues(ITypeDescriptorContext context) to return the StandardValuesCollection for the property type. Finally just decorate the property like so:

    [TypeConverter(typeof(MyClassConverter))]
    public MyClass MyProperty { get; set; }

designer属性窗口现在将具有一个包含有效值的下拉列表.

The designer property window will now have a dropdown with valid values.

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