访问uitypeeditor的editValue中的其他上下文数据

我想知道你想做的是不是比 TypeConverter 通过 GetStandardValues ?但不管怎样,两者都是 context.Instance 和 context.PropertyDescriptor 似乎 在快速测试中填充 GetEditStyle 和 EditValue ):

using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
class MyData
{
    [Editor(typeof(MyEditor), typeof(UITypeEditor))]
    public string Bar { get; set; }

    public string[] Options { get; set; }
}
class MyEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        // break point here; inspect context
        return UITypeEditorEditStyle.DropDown;
    }
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        // break point here; inspect context
        return base.EditValue(context, provider, value);
    }

}
class Program
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new Form
        {
            Controls =
            {
                new PropertyGrid {
                    Dock = DockStyle.Fill,
                    SelectedObject = new MyData()
                }
            }
        });
    }
}

或作为类型转换器:

using System;
using System.ComponentModel;
using System.Windows.Forms;

class MyData
{
    [TypeConverter(typeof(MyConverter))]
    public string Bar { get; set; }

    public string[] Options { get; set; }
}
class MyConverter : StringConverter
{
    public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
    {
        return true;
    }
    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
    {
        MyData data = (MyData)context.Instance;
        if(data == null || data.Options == null) {
            return new StandardValuesCollection(new string[0]);
        }
        return new StandardValuesCollection(data.Options);
    }
}
class Program
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new Form
        {
            Controls =
            {
                new PropertyGrid {
                    Dock = DockStyle.Fill,
                    SelectedObject = new MyData()
                }
            }
        });
    }
}

在类似的情况下,我想将一个对象注入到自定义的UItypeEditor的构造函数中。

我跟随尼古拉斯·卡迪尔哈克的评论 Here 把功劳都给他。它使用了typescriptionProvider。

这是完整的代码集。

class Foo
{
    public Foo() { Bar = new Bar(); }
    public Bar Bar { get; set; }
}

class Bar
{
    public string Value { get; set; }
}

class BarTypeDescriptionProvider : TypeDescriptionProvider
{
    private TypeDescriptionProvider _baseProvider;
    string _extraParam;

    public BarTypeDescriptionProvider(Type t, string extraParam)
    {
        this._extraParam = extraParam;
        _baseProvider = TypeDescriptor.GetProvider(t);
    }

    public string ExtraParam
    { 
        get { return _extraParam; } 
    }

    public override ICustomTypeDescriptor GetTypeDescriptor(Type objectType, object instance)
    {
        return new BarTypeDescriptor(this, _baseProvider.GetTypeDescriptor(objectType, instance), objectType);
    }
}


class BarTypeDescriptor : CustomTypeDescriptor
{
    private Type _objectType;
    private BarTypeDescriptionProvider _provider;

    public BarTypeDescriptor(BarTypeDescriptionProvider provider,  ICustomTypeDescriptor descriptor, Type objectType): base(descriptor)
    {
        if (provider == null) throw new ArgumentNullException("provider");
        if (descriptor == null)
            throw new ArgumentNullException("descriptor");
        if (objectType == null)
            throw new ArgumentNullException("objectType");
        _objectType = objectType;
        _provider = provider;
    }

    public override object GetEditor(Type editorBaseType)
    {
        return new BarEditor(_provider.ExtraParam);
    }
}


class BarEditor : UITypeEditor
{
    private string _extraParam;
    public BarEditor(string x)
        : base()
    {
        _extraParam = x;
    }

    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.Modal;
    }
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        MessageBox.Show(_extraParam);
        return base.EditValue(context, provider, value);
    }
}

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        string extraParam = "Extra param from main form";

        TypeDescriptor.AddProvider(new BarTypeDescriptionProvider(typeof(Bar), extraParam), typeof(Bar));

        this.propertyGrid1.SelectedObject = new Foo();
    }
}

迈克尔

在重写的EditValue方法中, context.Container 将提供编辑器所属的对象。这个 context.Container.Components 属性将列出包含窗体及其所有子级的所有控件。