Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Sql / SqlDataSourceEnumerator.cs / 1 / SqlDataSourceEnumerator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Sql { using System; using System.Data; using System.Data.Common; using System.Data.SqlClient; using System.Diagnostics; using System.Globalization; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Security; using System.Text; #if WINFSInternalOnly internal #else public #endif sealed class SqlDataSourceEnumerator : DbDataSourceEnumerator { private static readonly SqlDataSourceEnumerator SingletonInstance = new SqlDataSourceEnumerator(); internal const string ServerName = "ServerName"; internal const string InstanceName = "InstanceName"; internal const string IsClustered = "IsClustered"; internal const string Version = "Version"; private const int timeoutSeconds = ADP.DefaultCommandTimeout; private long timeoutTime; // variable used for timeout computations, holds the value of the hi-res performance counter at which this request should expire private SqlDataSourceEnumerator() : base() { } public static SqlDataSourceEnumerator Instance { get { return SqlDataSourceEnumerator.SingletonInstance; } } override public DataTable GetDataSources() { (new NamedPermissionSet("FullTrust")).Demand(); // char[] buffer = null; StringBuilder strbldr = new StringBuilder(); Int32 bufferSize = 1024; Int32 readLength = 0; buffer = new char[bufferSize]; bool more = true; bool failure = false; IntPtr handle = ADP.PtrZero; RuntimeHelpers.PrepareConstrainedRegions(); try { timeoutTime = TdsParserStaticMethods.GetTimeoutSeconds(timeoutSeconds); RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { handle = SNINativeMethodWrapper.SNIServerEnumOpen(); } if (ADP.PtrZero != handle) { while (more && !TdsParserStaticMethods.TimeoutHasExpired(timeoutTime)) { // readLength = UnsafeNativeMethods.SNIServerEnumReadEx(handle, buffer, bufferSize, ref more, TdsParserStaticMethods.GetTimeoutMilliseconds(timeoutTime)); readLength = SNINativeMethodWrapper.SNIServerEnumRead(handle, buffer, bufferSize, ref more); if (readLength > bufferSize) { failure = true; more = false; } else if (0 < readLength) { strbldr.Append(buffer, 0, readLength); } } } } finally { if (ADP.PtrZero != handle) { SNINativeMethodWrapper.SNIServerEnumClose(handle); } } if (failure) { Debug.Assert(false, "GetDataSources:SNIServerEnumRead returned bad length"); Bid.Trace("GetDataSources:SNIServerEnumRead returned bad length, requested %d, received %d", bufferSize, readLength); throw ADP.ArgumentOutOfRange("readLength"); } return ParseServerEnumString(strbldr.ToString()); } private static string _Version = "Version:"; private static string _Cluster = "Clustered:"; private static int _clusterLength = _Cluster.Length; private static int _versionLength =_Version.Length; static private DataTable ParseServerEnumString(string serverInstances) { DataTable dataTable = new DataTable("SqlDataSources"); dataTable.Locale = CultureInfo.InvariantCulture; dataTable.Columns.Add(ServerName, typeof(string)); dataTable.Columns.Add(InstanceName, typeof(string)); dataTable.Columns.Add(IsClustered, typeof(string)); dataTable.Columns.Add(Version, typeof(string)); DataRow dataRow = null; string serverName = null; string instanceName = null; string isClustered = null; string version = null; // Every row comes in the format "serverName\instanceName;Clustered:[Yes|No];Version:.." // Every row is terminated by a null character. // Process one row at a time foreach (string instance in serverInstances.Split('\0')) { string value = instance.Trim('\0'); // MDAC 91934 if (0 == value.Length) { continue; } foreach (string instance2 in value.Split(';')) { if (serverName == null) { foreach(string instance3 in instance2.Split('\\')) { if (serverName == null) { serverName = instance3; continue; } Debug.Assert(instanceName == null); instanceName = instance3; } continue; } if (isClustered == null) { Debug.Assert(String.Compare(_Cluster, 0, instance2, 0, _clusterLength, StringComparison.OrdinalIgnoreCase) == 0); isClustered = instance2.Substring(_clusterLength); continue; } Debug.Assert(version == null); Debug.Assert(String.Compare(_Version, 0, instance2, 0, _versionLength, StringComparison.OrdinalIgnoreCase) == 0); version = instance2.Substring(_versionLength); } string query = "ServerName='"+serverName+"'"; if (!ADP.IsEmpty(instanceName)) { // SQL BU DT 20006584: only append instanceName if present. query += " AND InstanceName='"+instanceName+"'"; } // SNI returns dupes - do not add them. SQL BU DT 290323 if (dataTable.Select(query).Length == 0) { dataRow = dataTable.NewRow(); dataRow[0] = serverName; dataRow[1] = instanceName; dataRow[2] = isClustered; dataRow[3] = version; dataTable.Rows.Add(dataRow); } serverName = null; instanceName = null; isClustered = null; version = null; } foreach(DataColumn column in dataTable.Columns) { column.ReadOnly = true; } return dataTable; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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