[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

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

来源：https://www.cnblogs.com/chinatrump/p/11513141.html