OTS/OTSIncAMeasureApp/OTSDisplayGridData/ComboBoxItemTypeConvert.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace OTSModelSharp
{


    //重写下拉菜单中的项，使之与属性页的项关联
    public abstract class ComboBoxItemTypeConvert : TypeConverter
    {
        public Hashtable myhash = null;
        public ComboBoxItemTypeConvert()
        {
            myhash = new Hashtable();
            GetConvertHash();
        }
        public abstract void GetConvertHash();

        //是否支持选择列表的编辑
        public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
        {
            return true;
        }
        //重写combobox的选择列表
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
        {
            int[] ids = new int[myhash.Values.Count];
            int i = 0;
            foreach (DictionaryEntry myDE in myhash)
            {
                ids[i++] = (int)(myDE.Key);
            }
            return new StandardValuesCollection(ids);
        }
        //判断转换器是否可以工作
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            if (sourceType == typeof(string))
            {
                return true;
            }
            return base.CanConvertFrom(context, sourceType);
        }
        //重写转换器，将选项列表（即下拉菜单）中的值转换到该类型的值
        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object obj)
        {
            if (obj is string)
            {
                foreach (DictionaryEntry myDE in myhash)
                {
                    if (myDE.Value.Equals((obj.ToString())))
                        return myDE.Key;
                }
            }
            return base.ConvertFrom(context, culture, obj);
        }
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                return true;
            }
            return base.CanConvertTo(context, destinationType);
        }
        //重写转换器将该类型的值转换到选择列表中
        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object obj, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                foreach (DictionaryEntry myDE in myhash)
                {
                    if (myDE.Key.Equals(obj))
                        return myDE.Value.ToString();
                }
                return "";
            }
            return base.ConvertTo(context, culture, obj, destinationType);
        }
        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
        {
            return false;
        }
    }
    //重写下拉菜单，在这里实现定义下拉菜单内的项
    public class MyComboItemConvert : ComboBoxItemTypeConvert
    {
        private Hashtable hash;
        public override void GetConvertHash()
        {
            try
            {
                myhash = hash;
            }
            catch
            {
                throw new NotImplementedException();
            }
        }
        public MyComboItemConvert(string str)
        {
            hash = new Hashtable();
            string[] stest = str.Split(',');
            for (int i = 0; i < stest.Length; i++)
            {
                hash.Add(i, stest[i]);
            }
            GetConvertHash();
            value = 0;
        }
        public int value { get; set; }
        public MyComboItemConvert(string str, int s)
        {
            hash = new Hashtable();
            string[] stest = str.Split(',');
            for (int i = 0; i < stest.Length; i++)
            {
                hash.Add(i, stest[i]);
            }
            GetConvertHash();
            value = s;
        }
    }
}