mcs/class/referencesource/System.Data/System/Data/Common/DbDataSourceEnumerator.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="DbDataSourceEnumerator.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">[....]</owner>
   6 // <owner current="true" primary="false">[....]</owner>
   7 //------------------------------------------------------------------------------
   8
   9 namespace System.Data.Common {
  10
  11     using System;
  12     using System.Collections;
  13     using System.ComponentModel;
  14     using System.Data;
  15     using System.Diagnostics;
  16     using System.Threading;
  17
  18     public abstract class DbDataSourceEnumerator { // V1.2.3300
  19
  20         protected DbDataSourceEnumerator() { // V1.2.3300
  21         }
  22
  23
  24         abstract public DataTable GetDataSources(); // V1.2.3300
  25
  26         /*
  27         virtual public IAsyncResult BeginGetDataSources(AsyncCallback callback, object asyncStateObject) { // V1.2.3300
  28             DbEnumSynchronousAsyncResult asyncResult = new DbEnumSynchronousAsyncResult(callback, asyncStateObject);
  29             try {
  30                 asyncResult._dataTable = GetElements();
  31                 asyncResult.SetCompletedSynchronously();
  32             }
  33             catch(DataAdapterException e) {
  34                 ADP.TraceExceptionForCapture(e);
  35                 asyncResult.ExceptionObject = e;
  36             }
  37             if (null == asyncResult._dataTable) {
  38                 throw ADP.DataAdapter("no datatable");
  39             }
  40             if (null != callback) {
  41                 callback(asyncResult);
  42             }
  43             return asyncResult;
  44         }
  45
  46         virtual public DataTable EndGetDataSources(IAsyncResult asyncResult) { // V1.2.3300
  47             ADP.CheckArgumentNull(asyncResult, "asyncResult");
  48             DbEnumSynchronousAsyncResult ar = (asyncResult as DbEnumSynchronousAsyncResult);
  49             if (ar._endXxxCalled) {
  50                 throw ADP.InvalidOperation("EndGetElements called twice");
  51             }
  52             ar._endXxxCalled = true;
  53
  54             if (null != ar.ExceptionObject) {
  55                 throw ar.ExceptionObject;
  56             }
  57             return ar._dataTable;
  58         }
  59
  60         sealed private class DbEnumSynchronousAsyncResult : DbAsyncResult {
  61             internal bool      _endXxxCalled;
  62             internal DataTable _dataTable;
  63
  64             internal DbEnumSynchronousAsyncResult(AsyncCallback callback, Object asyncStateObject) : base(null, callback, asyncStateObject) {
  65             }
  66         }
  67         */
  68     }
  69 }