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/**/
/// <summary>
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/// 泛型索引器
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/// </summary>
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/// <typeparam name="T">泛型</typeparam>
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/// <seealso cref="System.Collections.Generic.IEnumerable<T>"/>
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public
class
Indexer
<
T
>
: IEnumerable
<
T
>
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{
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/**//// <summary>
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/// 指向要用到
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/// </summary>
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private Dictionary<string, T> dict;
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/**//// <summary>
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/// 遇到错误时报错
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/// </summary>
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private bool allowThrowReadError = false;
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/**//// <summary>
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/// 构造方法
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/// </summary>
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/// <param name="dict"></param>
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/// <param name="allowThrowReadError">遇到错误时报错</param>
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public Indexer(Dictionary<string, T> dict,bool allowThrowReadError)
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{
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this.dict = new Dictionary<string, T>(dict);
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}
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/**//// <summary>
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/// 索引器
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/// </summary>
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/// <param name="key">键值</param>
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/// <returns>返回值</returns>
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/// <typeparam name="T">泛型</typeparam>
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/// <exception cref="Exception">当allowThrowReadError=true并且Key不存在时报异常</exception>
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public T this[String key]
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{
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get
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{
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if (dict == null) throw new Exception("索引器失效");
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if (dict.ContainsKey(key))
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{
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return dict[key];
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}
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if (allowThrowReadError) throw new Exception("不存在键值");
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else return default(T);
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}
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}
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/**//// <summary>
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/// 数目
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/// </summary>
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public int Count
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{
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get
{ return dict.Count; }
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}
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IEnumerator<T> IEnumerable<T>.GetEnumerator()
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{
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return dict.Values.GetEnumerator();
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}
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
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{
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return dict.Values.GetEnumerator();
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}
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使用设计管理器时的代码:
管理器的属性定义为