97 lines
3.8 KiB
C#
97 lines
3.8 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="OleDbEnumerator.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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namespace System.Data.OleDb {
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using System;
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using System.ComponentModel;
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using System.Data.Common;
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using System.Globalization;
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using System.Security;
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using System.Security.Permissions;
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public sealed class OleDbEnumerator {
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public OleDbEnumerator() {
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}
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public DataTable GetElements() {
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OleDbConnection.ExecutePermission.Demand();
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DataTable dataTable = new DataTable("MSDAENUM"); // WebData 112482
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dataTable.Locale = CultureInfo.InvariantCulture;
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OleDbDataReader dataReader = GetRootEnumerator();
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OleDbDataAdapter.FillDataTable(dataReader, dataTable);
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return dataTable;
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}
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static public OleDbDataReader GetEnumerator(Type type) {
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OleDbConnection.ExecutePermission.Demand();
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return GetEnumeratorFromType(type);
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}
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static internal OleDbDataReader GetEnumeratorFromType(Type type) { // WebData 99005
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// will demand security appropriately
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object value = Activator.CreateInstance(type, System.Reflection.BindingFlags.Public|System.Reflection.BindingFlags.Instance, null, null, CultureInfo.InvariantCulture, null);
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return GetEnumeratorReader(value);
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}
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static private OleDbDataReader GetEnumeratorReader(object value) {
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NativeMethods.ISourcesRowset srcrowset = null;
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try {
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srcrowset = (NativeMethods.ISourcesRowset) value;
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}
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catch(InvalidCastException) {
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throw ODB.ISourcesRowsetNotSupported();
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}
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if (null == srcrowset) {
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throw ODB.ISourcesRowsetNotSupported();
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}
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value = null; // still held by ISourcesRowset, reused for IRowset
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int propCount = 0;
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IntPtr propSets = ADP.PtrZero;
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Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB> IID_IRowset\n");
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OleDbHResult hr = srcrowset.GetSourcesRowset(ADP.PtrZero, ODB.IID_IRowset, propCount, propSets, out value);
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Bid.Trace("<oledb.ISourcesRowset.GetSourcesRowset|API|OLEDB|RET> %08X{HRESULT}\n", hr);
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Exception f = OleDbConnection.ProcessResults(hr, null, null);
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if (null != f) {
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throw f;
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}
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OleDbDataReader dataReader = new OleDbDataReader(null, null, 0, CommandBehavior.Default);
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dataReader.InitializeIRowset(value, ChapterHandle.DB_NULL_HCHAPTER, ADP.RecordsUnaffected);
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dataReader.BuildMetaInfo();
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dataReader.HasRowsRead();
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return dataReader;
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}
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static public OleDbDataReader GetRootEnumerator() {
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OleDbConnection.ExecutePermission.Demand();
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IntPtr hscp;
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Bid.ScopeEnter(out hscp, "<oledb.OleDbEnumerator.GetRootEnumerator|API>\n");
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try {
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//readonly Guid CLSID_MSDAENUM = new Guid(0xc8b522d0,0x5cf3,0x11ce,0xad,0xe5,0x00,0xaa,0x00,0x44,0x77,0x3d);
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//Type msdaenum = Type.GetTypeFromCLSID(CLSID_MSDAENUM, true);
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const string PROGID_MSDAENUM = "MSDAENUM";
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Type msdaenum = Type.GetTypeFromProgID(PROGID_MSDAENUM, true);
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return GetEnumeratorFromType(msdaenum);
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}
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finally {
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Bid.ScopeLeave(ref hscp);
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}
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}
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}
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}
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