如何强制 PropertyGrid 显示特定属性的自定义对话框?-C#/.NET问题

How can I force the PropertyGrid to show a custom dialog for a specific property?(如何强制 PropertyGrid 显示特定属性的自定义对话框?)

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问题描述

我有一个带有字符串属性的类，它同时具有 getter 和 setter，通常太长以至于 PropertyGrid 会截断字符串值.如何强制 PropertyGrid 显示省略号，然后启动包含多行文本框的对话框，以便轻松编辑属性?我知道我可能必须在属性上设置某种属性，但是什么属性以及如何设置?我的对话框是否必须实现一些特殊的设计器界面?

I have a class with a string property, having both a getter and a setter, that is often so long that the PropertyGrid truncates the string value. How can I force the PropertyGrid to show an ellipsis and then launch a dialog that contains a multiline textbox for easy editing of the property? I know I probably have to set some kind of attribute on the property, but what attribute and how? Does my dialog have to implement some special designer interface?

更新:这可能是我的问题的答案，但我找不到它搜索.我的问题比较笼统，它的答案可以用来构建任何类型的自定义编辑器.

Update: This is probably the answer to my question, but I could not find it by searching. My question is more general, and its answer can be used to build any type of custom editor.

推荐答案

你需要为属性设置一个[Editor(...)]，给它一个UITypeEditor；像这样(使用您自己的编辑器...)


You need to set an  for the property, giving it a UITypeEditor that does the edit; like so (with your own editor...)
using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;


static class Program
{
    static void Main()
    {
        Application.Run(new Form { Controls = { new PropertyGrid { SelectedObject = new Foo() } } });
    }
}



class Foo
{
    [Editor(typeof(StringEditor), typeof(UITypeEditor))]
    public string Bar { get; set; }
}

class StringEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.Modal;
    }
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        IWindowsFormsEditorService svc = (IWindowsFormsEditorService)
            provider.GetService(typeof(IWindowsFormsEditorService));
        if (svc != null)
        {
            svc.ShowDialog(new Form());
            // update etc
        }
        return value;
    }
}

您可能会通过查看行为符合您需要的现有属性来追踪现有编辑器.
You might be ablt to track down an existing Editor by looking at existing properties that behave like you want.

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