MVVM转换器Int2StringConverter基础类

很多时候都是会用到int 转换为字符串的情况的转换器

可能在编辑界面需要一个下拉框来显示列表

在列表页面需要一个转换器显示为具体的字符串数据

这个时候使用,有一个Items属性的转换器,就都搞定了

using Client.Model;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows.Data;

namespace Client.Common.Converter
{
    [ValueConversion(typeof(int), typeof(string))]
    public class Int2StringConverter : NotifyPropertyChanged, IValueConverter
    {
        public Int2StringConverter()
        {
            Items = new ObservableCollection<ListItem>();
            InitialItems();
        }

        protected virtual void InitialItems()
        {

        }
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string result = string.Empty;
            if (value == null)
            {
                return result;
            }
            int sourceValue = System.Convert.ToInt32(value);
            var model = Items.Where(f => f.Value == sourceValue).FirstOrDefault();
            if (model != null)
                result = model.DisplayName;
            return result;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            int result = -1;
            if (value == null)
            {
                return result;
            }
            string sourceValue = value.ToString();
            var model = Items.Where(f => f.DisplayName == sourceValue);
            if (model.Count() > 0)
                result = model.First().Value.Value;
            return result;
        }

        private ObservableCollection<ListItem> items;

        public ObservableCollection<ListItem> Items
        {
            get { return items; }
            set
            {
                items = value;
                OnPropertyChanged("Items");
            }
        }

    }
}