c# Winform PropertyGrid 实现下拉框 多选

using PropertyGridHelpers.Controls;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

namespace PropertyGridHelpers.UIEditors
{

    public class FlagEnumUIEditor : UITypeEditor
    {
        private CheckedListBoxEx check;

        public FlagEnumUIEditor()
        {
            check = new CheckedListBoxEx();
            check.BorderStyle = BorderStyle.None;
        }

        public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
        {
            if (context != null && context.Instance != null && provider != null)
            {
                IWindowsFormsEditorService service = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
                if (service != null)
                {
                    List<KeyValuePair<string, string>> list = new List<KeyValuePair<string, string>>();
                    for (int i = 0; i < 100; i++)
                    {
                        list.Add(new KeyValuePair<string, string>(i.ToString(), Guid.NewGuid().ToString("N")));
                    }
                    check.DataSource = list;
                    service.DropDownControl(check);
                    return check.GetSelectItemValueText;
                }
            }
            return null;
        }

        public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
        {
            return UITypeEditorEditStyle.DropDown;
        }
    }
}

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Collections.Generic;
using System.Linq;

namespace PropertyGridHelpers.Controls
{

    public class CheckedListBoxEx : CheckedListBox
    {
        private Container components = null;
        public CheckedListBoxEx()
        {
            InitializeComponent();
        }
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                    components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Component Designer generated code

        private void InitializeComponent()
        {
            this.CheckOnClick = true;
        }
        protected override void OnItemCheck(ItemCheckEventArgs e)
        {
            base.OnItemCheck(e);
        }
        #endregion

        #region Add
        public CheckItem Add(string code, string value)
        {
            CheckItem item = new CheckItem(code, value);
            Items.Add(item);
            return item;
        }
        public CheckItem Add(CheckItem item)
        {
            Items.Add(item);
            return item;
        }
        #endregion
        #region 获取选择值
        public string GetSelectItemValueText { get { return string.Join(",", GetSelectItemAll.Select(n => n.Value)); } }
        public string GetSelectItemKeyText { get { return string.Join(",", GetSelectItemAll.Select(n => n.Key)); } }
        public List<KeyValuePair<string, string>> GetSelectItemAll
        {
            get
            {
                List<KeyValuePair<string, string>> list = new List<KeyValuePair<string, string>>();
                for (int i = 0; i < Items.Count; i++)
                {
                    CheckItem item = Items[i] as CheckItem;
                    if (GetItemChecked(i))
                    {
                        list.Add(new KeyValuePair<string, string>(item.Code, item.Value));
                    }
                }
                return list;
            }
        }
        #endregion
        private object data;
        /// <summary>
        /// 绑定数据源
        /// </summary>
        /// <param name="data"></param>
        public new object DataSource
        {
            get
            {
                return data;
            }
            set
            {
                data = value;
                if (data is IEnumerable<KeyValuePair<string, string>>)
                {
                    foreach (KeyValuePair<string, string> item in (data as IEnumerable<KeyValuePair<string, string>>))
                    {
                        Add(item.Key, item.Value);
                    }
                }
                else if (data is IEnumerable<CheckItem>)
                {
                    foreach (CheckItem item in (data as IEnumerable<CheckItem>))
                    {
                        Add(item);
                    }
                }
            }
        }

    }
}

namespace PropertyGridHelpers.Controls
{
    /// <summary>
    /// Represents an item in the checklistbox
    /// </summary>
    public class CheckItem
    {
        public string Value;
        public string Code;
        public CheckItem(string code, string value)
        {
            this.Value = value;
            this.Code = code;
        }
        public override string ToString()
        {
            return Value;
        }
    }

}

using PropertyGridHelpers.UIEditors;
using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            propertyGrid1.SelectedObject = new PropertyList(); ;
        }
    }
    class PropertyList
    {
        string m_dir;
        [EditorAttribute(typeof(FlagEnumUIEditor), typeof(System.Drawing.Design.UITypeEditor))]
        [DisplayName("Direction")]
        [Description("Direction property")]
        public string Dir
        {
            get
            {
                return m_dir;
            }
            set
            {
                m_dir = value;
            }
        }
    }
 
}

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提取码：bdrd
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