mcs/class/referencesource/System.Data/System/Data/BaseCollection.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="BaseCollection.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 // <owner current="true" primary="false">Microsoft</owner>
   7 // <owner current="false" primary="false">Microsoft</owner>
   8 //------------------------------------------------------------------------------
   9
  10 namespace System.Data {
  11     using System;
  12     using System.Collections;
  13     using System.ComponentModel;
  14     using System.Globalization;
  15
  16     /// <devdoc>
  17     ///    <para>Provides the base functionality for creating collections.</para>
  18     /// </devdoc>
  19     public class InternalDataCollectionBase : ICollection {
  20         internal static CollectionChangeEventArgs RefreshEventArgs = new CollectionChangeEventArgs(CollectionChangeAction.Refresh, null);
  21
  22         //==================================================
  23         // the ICollection methods
  24         //==================================================
  25         /// <devdoc>
  26         ///    <para>Gets the total number of elements in a collection.</para>
  27         /// </devdoc>
  28         [
  29         Browsable(false)
  30         ]
  31         public virtual int Count {
  32             get {
  33                 return List.Count;
  34             }
  35         }
  36
  37         public virtual void CopyTo(Array ar, int index) {
  38             List.CopyTo(ar, index);
  39         }
  40
  41         public virtual IEnumerator GetEnumerator() {
  42             return List.GetEnumerator();
  43         }
  44
  45         [
  46         Browsable(false)
  47         ]
  48         public bool IsReadOnly {
  49             get {
  50                 return false;
  51             }
  52         }
  53
  54         [Browsable(false)]
  55         public bool IsSynchronized {
  56             get {
  57                 // so the user will know that it has to lock this object
  58                 return false;
  59             }
  60         }
  61
  62         // Return value:
  63         // > 0 (1)  : CaseSensitve equal
  64         // < 0 (-1) : Case-Insensitive Equal
  65         // = 0      : Not Equal
  66         internal int NamesEqual(string s1, string s2, bool fCaseSensitive, CultureInfo locale) {
  67             if (fCaseSensitive) {
  68                 if (String.Compare(s1, s2, false, locale) == 0)
  69                     return 1;
  70                 else
  71                     return 0;
  72             }
  73
  74             // Case, kana and width -Insensitive compare
  75             if (locale.CompareInfo.Compare(s1, s2,
  76                 CompareOptions.IgnoreCase | CompareOptions.IgnoreKanaType | CompareOptions.IgnoreWidth) == 0) {
  77                 if (String.Compare(s1, s2, false, locale) == 0)
  78                     return 1;
  79                 else
  80                     return -1;
  81             }
  82             return 0;
  83         }
  84
  85
  86         [Browsable(false)]
  87         public object SyncRoot {
  88             get {
  89                 return this;
  90             }
  91         }
  92
  93         protected virtual ArrayList List {
  94             get {
  95                 return null;
  96             }
  97         }
  98     }
  99 }