C# 【List拓展】两个List比较是否相同

[code]using System;public static class ListExpand{/// <summary>/// 判断两个集合是否是相等的(所有的元素及数量都相等)/// </summary>/// <typeparam name=\"T\">集合元素类型</typeparam>/// <param name=\"sourceCollection\">源集合列表</param>/// <param name=\"targetCollection\">目标集合列表</param>/// <returns>两个集合相等则返回True,否则返回False</returns>public static bool EqualList<T>(this IList<T> sourceCollection, IList<T> targetCollection) where T : IEquatable<T>{//空集合直接返回False,即使是两个都是空集合,也返回Falseif (sourceCollection == null || targetCollection == null){return false;}if (object.ReferenceEquals(sourceCollection, targetCollection)){return true;}if (sourceCollection.Count != targetCollection.Count){return false;}var sourceCollectionStaticsDict = sourceCollection.StatisticRepetition();var targetCollectionStaticsDict = targetCollection.StatisticRepetition();return sourceCollectionStaticsDict.EqualDictionary(targetCollectionStaticsDict);}/// <summary>/// 判断两个字典是否是相等的(所有的字典项对应的值都相等)/// </summary>/// <typeparam name=\"TKey\">字典项类型</typeparam>/// <typeparam name=\"TValue\">字典值类型</typeparam>/// <param name=\"sourceDictionary\">源字典</param>/// <param name=\"targetDictionary\">目标字典</param>/// <returns>两个字典相等则返回True,否则返回False</returns>public static bool EqualDictionary<TKey, TValue>(this Dictionary<TKey, TValue> sourceDictionary, Dictionary<TKey, TValue> targetDictionary)where TKey : IEquatable<TKey>where TValue : IEquatable<TValue>{//空字典直接返回False,即使是两个都是空字典,也返回Falseif (sourceDictionary == null || targetDictionary == null){return false;}if (object.ReferenceEquals(sourceDictionary, targetDictionary)){return true;}if (sourceDictionary.Count != targetDictionary.Count){return false;}//比较两个字典的Key与Valueforeach (KeyValuePair<TKey, TValue> item in sourceDictionary){//如果目标字典不包含源字典任意一项,则不相等if (!targetDictionary.ContainsKey(item.Key)){return false;}//如果同一个字典项的值不相等,则不相等if (!targetDictionary[item.Key].Equals(item.Value)){return false;}}return true;}/// <summary>/// 统计集合的重复项,并返回一个字典/// </summary>/// <typeparam name=\"T\">集合元素类型</typeparam>/// <param name=\"sourceCollection\">统计集合列表</param>/// <returns>返回一个集合元素及重复数量的字典</returns>private static Dictionary<T, int> StatisticRepetition<T>(this IEnumerable<T> sourceCollection) where T : IEquatable<T>{var collectionStaticsDict = new Dictionary<T, int>();foreach (var item in sourceCollection){if (collectionStaticsDict.ContainsKey(item)){collectionStaticsDict[item]++;}else{collectionStaticsDict.Add(item, 1);}}return collectionStaticsDict;}}

使用时直接使用字段调取EqualList

[code]//查询数据返回listList<string> tempQueryList = DBSvc.instance.QueryData();//查询不到数据|查询数据与现有数据相等if (tempQueryList==null | dataList.EqualList(tempQueryList)){return;}

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