C#封装WinForm控件遇到的问题

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

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

namespace CommonControl
{
    public class MyListControl : Control
    {
        public MyListControl()
        {

        }

        private MlyScope scopes = new MlyScope(0, 0);

        [Browsable(true)]
        public MlyScope Scopes
        {
            get { return scopes; }
            set { scopes = value; }
        }

    }
    [TypeConverter(typeof(MlyScopeConverter))]
    public class MlyScope
    {
        private Int32 _min;
        private Int32 _max;

        public MlyScope()
        {
        }

        public MlyScope(Int32 min, Int32 max)
        {
            _min = min;
            _max = max;
        }

        [Browsable(true)]
        public Int32 Min
        {
            get
            {
                return _min;
            }
            set
            {
                _min = value;
            }
        }

        [Browsable(true)]
        public Int32 Max
        {
            get
            {
                return _max;
            }
            set 
 
            {
                _max = value;
            }

        }
    }
    public class MlyScopeConverter : TypeConverter
    {
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(String)) return true;

            return base.CanConvertFrom(context, sourceType);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            if (destinationType == typeof(String)) return true;

            if (destinationType == typeof(InstanceDescriptor)) return true;

            return base.CanConvertTo(context, destinationType);
        }

        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
        {
            String result = "";
            if (destinationType == typeof(String))
            {
                MlyScope scope = (MlyScope)value;
                result = scope.Min.ToString() + "," + scope.Max.ToString();
                return result;

            }

            if (destinationType == typeof(InstanceDescriptor))
            {
                ConstructorInfo ci = typeof(MlyScope).GetConstructor(new Type[] { typeof(Int32), typeof(Int32) });
                MlyScope scope = (MlyScope)value;
                return new InstanceDescriptor(ci, new object[] { scope.Min, scope.Max });
            }
            return base.ConvertTo(context, culture, value, destinationType); 
 
        }

        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
        {
            if (value is string)
            {
                String[] v = ((String)value).Split(',');
                if (v.GetLength(0) != 2)
                {
                    throw new ArgumentException("Invalid parameter format");
                }

                MlyScope csf = new MlyScope();
                csf.Min = Convert.ToInt32(v[0]);
                csf.Max = Convert.ToInt32(v[1]);
                return csf;
            }
            return base.ConvertFrom(context, culture, value);
        }

        public override bool GetPropertiesSupported(ITypeDescriptorContext context)
        {
            return true;
        }

        public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes)
        {
            return TypeDescriptor.GetProperties(typeof(MlyScope), attributes);
        }
    }

当在属性面板上填写数字的时候

报错了

当更改此类库的版本号后好了，但是再次将这个控件拖入到Form控件上点保存时又出现了这个问题！ c# winform
[解决办法]
有两个版本的CommonControl
[解决办法]
问题的答案在提示中已经给你说了。
同时可以参见我的商业控件库（全源码）
地址为：
http://item.taobao.com/item.htm?spm=a1z10.1.w8679133417.6.zwE4C8&id=18719359053