【代码保留】成对值类（PairCollection和Pair）

第一次泛型编程（以前从来也只有用过List<T>之类的）
不知道会有什么问题呢？继承IList的部分没有注释了，MSDN可以查的。欢迎提意见噢～
你可能会看到下面的类用多种方式实现了同样的效果，有多态，有模版，还有包装wrapper（不知道是不是恰当）……还用了泛型……
实际项目中，如果有可取之处，请只取其中一种就可以了……（计划中……）

补充一张VS自动生成的类图

using System;
using System.Collections.Generic;
using System.Collections;

namespace CA_PairCollection
{
    /**//// <summary>
    /// 基础格式化机制
    /// </summary>
    /// <typeparam name="T"></typeparam>
    interface IFormat<T>
    {
        T GetFormat();
    }

    /**//// <summary>
    /// 格式化模板接口
    /// </summary>
    interface IFormatTemplate
    {
        /**//// <summary>
        /// Text模版，形如:"Text = "
        /// </summary>
        string TextTemplate { get;set;}
        /**//// <summary>
        /// Value模版，形如:"Value = "
        /// </summary>
        string ValueTemplate { get;set;}
        /**//// <summary>
        /// 分隔符模版，形如:","
        /// </summary>
        string Separator { get;set;}
    }

    /**//// <summary>
    /// 提供用于格式化对象的模板的格式化机制
    /// </summary>
    interface IFormatProvider
    {
        string GetFormat(IFormatTemplate formatTemplate);
    }

    /**//// <summary>
    /// 格式化模板类
    /// </summary>
    class FormatTemplate : IFormatTemplate
    {
        public FormatTemplate(string textTemplate,string separator,string valueTemplate)
        {
            this.textTemplate = textTemplate;
            this.separator = separator;
            this.valueTemplate = valueTemplate;
        }

        private string textTemplate;
        private string separator;
        private string valueTemplate;
        IFormatTemplate 成员#region IFormatTemplate 成员

        public string TextTemplate
        {
            get
            {
                return this.textTemplate;
            }
            set
            {
                this.textTemplate = value;
            }
        }

        public string ValueTemplate
        {
            get
            {
                return this.valueTemplate;
            }
            set
            {
                this.valueTemplate = value;
            }
        }

        public string Separator
        {
            get
            {
                return this.separator;
            }
            set
            {
                this.separator = value;
            }
        }

        #endregion
    }

    /**//// <summary>
    /// 成对参数类
    /// </summary>
    /// <typeparam name="U"></typeparam>
    /// <typeparam name="V"></typeparam>
    class Pair<U, V> : IFormat<string>, IFormatProvider
    {
        public Pair() { }
        public Pair(U text, V value)
        {
            this.text = text;
            this.value = value;
        }

        private U text;
        public U Text
        {
            get
            {
                return this.text;
            }
            set
            {
                this.text = value;
            }
        }

        private V value;
        public V Value
        {
            get
            {
                return this.value;
            }
            set
            {
                this.value = value;
            }
        }

        IFormat 成员#region IFormat<string> 成员

        public virtual string GetFormat()
        {
            return "Text = " + this.Text.ToString() + "; Value = " + this.Value.ToString();
        }

        #endregion

        IFormatProvider 成员#region IFormatProvider 成员

        public virtual string GetFormat(IFormatTemplate formatTemplate)
        {
            return formatTemplate.TextTemplate + this.Text.ToString()
                + formatTemplate.Separator
                + formatTemplate.ValueTemplate + this.Value.ToString();
        }

        #endregion

    }

    /**//// <summary>
    /// 成对参数类集合
    /// </summary>
    /// <typeparam name="U"></typeparam>
    /// <typeparam name="V"></typeparam>
    class PairCollection<U, V> : IList<Pair<U, V>>, IFormat<string>, IFormatProvider
    {
        private IList<Pair<U, V>> pairs;

        public PairCollection()
        {
            pairs = new List<Pair<U, V>>();
        }
        
        IListPairU,V 成员#region IList<Pair<U,V>> 成员

        public int IndexOf(Pair<U, V> item)
        {
            return this.pairs.IndexOf(item);
        }

        public void Insert(int index, Pair<U, V> item)
        {
            this.pairs.Insert(index,item);
        }

        public void RemoveAt(int index)
        {
            this.pairs.RemoveAt(index);
        }

        public Pair<U, V> this[int index]
        {
            get
            {
                return this.pairs[index];
            }
            set
            {
                this.pairs[index]=value;
            }
        }

        #endregion

        ICollectionPairU,V 成员#region ICollection<Pair<U,V>> 成员

        public void Add(Pair<U, V> item)
        {
            this.pairs.Add(item);
        }

        public void Clear()
        {
            this.pairs.Clear();
        }

        public bool Contains(Pair<U, V> item)
        {
            return this.pairs.Contains(item);
        }

        public void CopyTo(Pair<U, V>[] array, int arrayIndex)
        {
            this.pairs.CopyTo(array,arrayIndex);
        }

        public int Count
        {
            get 
            {
                return this.pairs.Count;
            }
        }

        public bool IsReadOnly
        {
            get 
            {
                return this.IsReadOnly;
            }
        }

        public bool Remove(Pair<U, V> item)
        {
            return this.Remove(item);
        }

        #endregion

        IEnumerablePairU,V 成员#region IEnumerable<Pair<U,V>> 成员

        public IEnumerator<Pair<U, V>> GetEnumerator()
        {
            return this.pairs.GetEnumerator();
        }

        #endregion

        IEnumerable 成员#region IEnumerable 成员

        IEnumerator IEnumerable.GetEnumerator()
        {
            return (IEnumerator)GetEnumerator();
        }

        #endregion

        IFormat 成员#region IFormat 成员

        public virtual string GetFormat()
        {
            string result = string.Empty;
            foreach (Pair<U, V> p in this.pairs)
            {
                result = result + p.GetFormat() + "\r\n";
            }
            return result;
        }

        #endregion

        IFormatProvider 成员#region IFormatProvider 成员

        public string GetFormat(IFormatTemplate formatTemplate)
        {
            string result = string.Empty;
            foreach (Pair<U, V> p in this.pairs)
            {
                result = result + p.GetFormat(formatTemplate) + "\r\n";
            }
            return result;
        }

        #endregion
    }

    /**//// <summary>
    /// 实现了中文式成对参数的类
    /// </summary>
    /// <typeparam name="U"></typeparam>
    /// <typeparam name="V"></typeparam>
    sealed class ChinesePair<U, V> : Pair<U, V>
    {
        public ChinesePair()
            : base()
        { }
        public ChinesePair(U text,V value)
            : base(text, value)
        { }
        public override string GetFormat()
        {
            return "文本 = " + this.Text.ToString() + "; 值 = " + this.Value.ToString();
        }
    }

    /**//// <summary>
    /// 实现了英文式成对参数的类
    /// </summary>
    /// <typeparam name="U"></typeparam>
    /// <typeparam name="V"></typeparam>
    sealed class EnglishPair<U, V> : Pair<U, V>
    {
        public EnglishPair()
            : base()
        { }
        public EnglishPair(U text, V value)
            : base(text, value)
        { }
        public override string GetFormat()
        {
            return "Text = " + this.Text.ToString() + "; Value = " + this.Value.ToString();
        }
    }

    /**//// <summary>
    /// 键值均为string类型的一个类型包装
    /// </summary>
    class KVPairCollection : PairCollection<string, string>,IFormat<string>
    {
        private PairCollection<string, string> p;
        public KVPairCollection()
        {
            p = new PairCollection<string, string>();
        }

        IFormat 成员#region IFormat<string> 成员

        string IFormat<string>.GetFormat()
        {
            return p.GetFormat();
        }

        #endregion
    }

    class Program
    {
        static void Main(string[] args)
        {
            //
            //以下示例用多种方式实现了成对类的格式化输出
            //

            PairCollection<string, string> psBases = new PairCollection<string, string>();
            psBases.Add(new Pair<string, string>("baseText1", "baseValue1"));
            psBases.Add(new Pair<string, string>("baseText2", "baseValue2"));
            foreach (Pair<string, string> p in psBases)
            {
                Console.WriteLine(p.GetFormat());
            }

            Console.WriteLine("----------------------");

            PairCollection<string, string> psPloyStrings = new PairCollection<string, string>();
            psPloyStrings.Add(new ChinesePair<string, string>("textChinese1", "valueChinese1"));
            psPloyStrings.Add(new EnglishPair<string, string>("textEnglish1", "valueEnglish1"));
            foreach (Pair<string, string> p in psPloyStrings)
            {
                Console.WriteLine(p.GetFormat());
            }

            Console.WriteLine("----------------------");

            PairCollection<string, int> psPloyInts = new PairCollection<string, int>();
            psPloyInts.Add(new ChinesePair<string, int>("textChinese1", 1));
            psPloyInts.Add(new EnglishPair<string, int>("textEnglish1", 2));
            foreach (Pair<string, int> p in psPloyInts)
            {
                Console.WriteLine(p.GetFormat());
            }

            Console.WriteLine("----------------------");

            Console.WriteLine(psPloyStrings.GetFormat());
            Console.WriteLine(psPloyInts.GetFormat());

            Console.WriteLine("----------------------");

            KVPairCollection kvs = new KVPairCollection();
            kvs.Add(new ChinesePair<string, string>("textChinese1", "valueChinese1"));
            kvs.Add(new EnglishPair<string, string>("textEnglish1", "valueEnglish1"));
            kvs.Add(new Pair<string, string>("textBase1", "valueBase"));
            Console.WriteLine(kvs.GetFormat());

            Console.WriteLine("----------------------");

            PairCollection<string, string> pFormatProvider = new PairCollection<string, string>();
            pFormatProvider.Add(new ChinesePair<string, string>("textChinese1", "valueChinese1"));
            pFormatProvider.Add(new EnglishPair<string, string>("textEnglish1", "valueEnglish1"));
            Console.WriteLine(pFormatProvider.GetFormat((IFormatTemplate)(new FormatTemplate("模版Text = "," ; ", "模版Value = "))));
        }
    }
}