C# 判断两个集合(List)是否相等
/// <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False
if (sourceCollection == null || targetCollection == null)
{
return false;
}
if (object.ReferenceEquals(sourceCollection, targetCollection))
{
return true;
}
if ( != )
{
return false;
}
var sourceCollectionStaticsDict = ();
var targetCollectionStaticsDict = ();
return (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False
if (sourceDictionary == null || targetDictionary == null)
{
return false;
}
if (object.ReferenceEquals(sourceDictionary, targetDictionary))
{
return true;
}
if ( != )
{
return false;
}
//比较两个字典的Key与Value
foreach (var item in sourceDictionary)
{
//如果目标字典不包含源字典任意一项,则不相等
if (!())
{
return false;
}
//如果同一个字典项的值不相等,则不相等
if (!targetDictionary[].Equals())
{
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 ((item))
{
collectionStaticsDict[item]++;
}
else
{
(item, 1);
}
}
return collectionStaticsDict;
}