[C#.NET][VB.NET] 实践 IEqualityComparer 不分大小写

实践IEqualityComparer，不分大小写比较

       //实践

        public class InComparer : IEqualityComparer

        {

            CaseInsensitiveComparer myComparer = new CaseInsensitiveComparer();

            public int GetHashCode(object obj)

            {

                return obj.ToString().ToLowerInvariant().GetHashCode();

            }

            public new bool Equals(object x, object y)

            {

                if (myComparer.Compare(x, y) == 0)

                {

                    return true;

                }

                else

                {

                    return false;

                }

            }

        }

因为不分大小写所以First与first视为相同，程序在执行时会出现例外。

//引用类

Hashtable myData = new Hashtable(new InComparer());

myData.Add("First", "1st");

myData.Add("Senond", "2nd");

myData.Add("Third", "3rd");

myData.Add("Fourth", "4th");

myData.Add("Fifth", "5th");

myData.Add("first", "1st");

foreach (DictionaryEntry myEntry in myData)

{

       Console.WriteLine("{0} = {1}", myEntry.Key, myEntry.Value);

}

当然也可以用CollectionsUtil类来不分大小写，这段程序看起来就短多了。

Hashtable myColl = CollectionsUtil.CreateCaseInsensitiveHashtable();

myColl.Add("A", "1234");

myColl.Add("a", "1234");

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原文:大专栏  [C#.NET][VB.NET] 实践 IEqualityComparer 不分大小写

原文地址：https://www.cnblogs.com/chinatrump/p/11513141.html