如何创建一个打开窗体PropertyGrid的自定义编辑项目？ [英] How to create custom PropertyGrid editor item which opens a form?

问题描述

我有一个List＆LT;>（我的自定义类）。我想在PropertyGrid控件一个框来显示此列表中的特定项目。在框的末尾我想[...]按钮。单击时，它会打开一个形式，除其他事项外，将允许他们从列表中选择的项目之一。当关闭时，PropertyGrid中会被更新以反映选择的值。

I have a List<> (my custom class). I want to display a specific item in this list in a box on the PropertyGrid control. At the end of the box I would like the [...] button. When clicked, it would open up a form which, among other things, would allow them to pick one of the items from the List. When closed, the PropertyGrid would be updated to reflect the selected value.

任何帮助AP preciated。

Any help appreciated.

推荐答案

您需要实现一个模式 UITypeEditor的，使用 IWindowsFormsEditorService 服务以显示它：

You need to implement a modal UITypeEditor, using the IWindowsFormsEditorService service to display it:

using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
using System;

class MyType
{
    private Foo foo = new Foo();
    public Foo Foo { get { return foo; } }
}

[Editor(typeof(FooEditor), typeof(UITypeEditor))]
[TypeConverter(typeof(ExpandableObjectConverter))]
class Foo
{
    private string bar;
    public string Bar
    {
        get { return bar; }
        set { bar = value; }
    }
}
class FooEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.Modal;
    }
    public override object EditValue(ITypeDescriptorContext context, System.IServiceProvider provider, object value)
    {
        IWindowsFormsEditorService svc = provider.GetService(typeof(IWindowsFormsEditorService)) as IWindowsFormsEditorService;
        Foo foo = value as Foo;
        if (svc != null && foo != null)
        {            
            using (FooForm form = new FooForm())
            {
                form.Value = foo.Bar;
                if (svc.ShowDialog(form) == DialogResult.OK)
                {
                    foo.Bar = form.Value; // update object
                }
            }
        }
        return value; // can also replace the wrapper object here
    }
}
class FooForm : Form
{
    private TextBox textbox;
    private Button okButton;
    public FooForm() {
        textbox = new TextBox();
        Controls.Add(textbox);
        okButton = new Button();
        okButton.Text = "OK";
        okButton.Dock = DockStyle.Bottom;
        okButton.DialogResult = DialogResult.OK;
        Controls.Add(okButton);
    }
    public string Value
    {
        get { return textbox.Text; }
        set { textbox.Text = value; }
    }
}
static class Program
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Form form = new Form();
        PropertyGrid grid = new PropertyGrid();
        grid.Dock = DockStyle.Fill;
        form.Controls.Add(grid);
        grid.SelectedObject = new MyType();
        Application.Run(form);
    }
}

请注意：如果您需要访问有关财产（父对象等）的情况下的东西，那是什么 ITypeDescriptorContext （在的EditValue ）提供;它告诉你的的PropertyDescriptor 和实例（即的MyType ）这是参与。

Note: if you need to access something about the context of the property (the parent object etc), that is what the ITypeDescriptorContext (in EditValue) provides; it tells you the PropertyDescriptor and Instance (the MyType) that is involved.

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