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

[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");

若有谬误，烦请告知，新手发帖请多包涵

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