Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / OleDb / PropertyInfoSet.cs / 1 / PropertyInfoSet.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //----------------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Data; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Threading; using System.Runtime.ConstrainedExecution; namespace System.Data.OleDb { sealed internal class OleDbPropertyInfo { public Guid _propertySet; public Int32 _propertyID; public string _description; public string _lowercase; public Type _type; public int _flags; public int _vtype; public object _supportedValues; public object _defaultValue; } internal sealed class PropertyInfoSet : SafeHandle { private int setCount; private IntPtr descBuffer; internal PropertyInfoSet(UnsafeNativeMethods.IDBProperties idbProperties, PropertyIDSet propIDSet) : base(IntPtr.Zero, true) { OleDbHResult hr; int propIDSetCount = propIDSet.Count; // avoid need for ReliabilityContract on get_Count Bid.Trace("\n"); RuntimeHelpers.PrepareConstrainedRegions(); try {} finally { hr = idbProperties.GetPropertyInfo(propIDSetCount, propIDSet, out this.setCount, out base.handle, out this.descBuffer); } Bid.Trace(" %08X{HRESULT}\n", hr); if ((0 <= hr) && (ADP.PtrZero != handle)) { SafeNativeMethods.Wrapper.ClearErrorInfo(); } } public override bool IsInvalid { get { return ((IntPtr.Zero == base.handle) && (IntPtr.Zero == this.descBuffer)); } } internal Dictionary GetValues() { Dictionary propertyLookup = null; bool mustRelease = false; RuntimeHelpers.PrepareConstrainedRegions(); try { DangerousAddRef(ref mustRelease); if (ADP.PtrZero != this.handle) { propertyLookup = new Dictionary (StringComparer.OrdinalIgnoreCase); IntPtr setPtr = this.handle; tagDBPROPINFO propinfo = new tagDBPROPINFO(); tagDBPROPINFOSET propinfoset = new tagDBPROPINFOSET(); for (int i = 0; i < setCount; ++i, setPtr = ADP.IntPtrOffset(setPtr, ODB.SizeOf_tagDBPROPINFOSET)) { Marshal.PtrToStructure(setPtr, propinfoset); int infoCount = propinfoset.cPropertyInfos; IntPtr infoPtr = propinfoset.rgPropertyInfos; for(int k = 0; k < infoCount; ++k, infoPtr = ADP.IntPtrOffset(infoPtr, ODB.SizeOf_tagDBPROPINFO)) { Marshal.PtrToStructure(infoPtr, propinfo); OleDbPropertyInfo propertyInfo = new OleDbPropertyInfo(); propertyInfo._propertySet = propinfoset.guidPropertySet; propertyInfo._propertyID = propinfo.dwPropertyID; propertyInfo._flags = propinfo.dwFlags; propertyInfo._vtype = propinfo.vtType; propertyInfo._supportedValues = propinfo.vValue; propertyInfo._description = propinfo.pwszDescription; propertyInfo._lowercase = propinfo.pwszDescription.ToLower(CultureInfo.InvariantCulture); propertyInfo._type = PropertyInfoSet.FromVtType(propinfo.vtType); if (Bid.AdvancedOn) { Bid.Trace(" \n");//, propertyInfo); } propertyLookup[propertyInfo._lowercase] = propertyInfo; } } } } finally { if (mustRelease) { DangerousRelease(); } } return propertyLookup; } override protected bool ReleaseHandle() { // NOTE: The SafeHandle class guarantees this will be called exactly once and is non-interrutible. IntPtr ptr = base.handle; base.handle = IntPtr.Zero; if (IntPtr.Zero != ptr) { int count = this.setCount; for (int i = 0; i < count; ++i) { int offset = (i * ODB.SizeOf_tagDBPROPINFOSET); IntPtr infoPtr = Marshal.ReadIntPtr(ptr, offset); if (IntPtr.Zero != infoPtr) { int infoCount = Marshal.ReadInt32(ptr, offset + ADP.PtrSize); for (int k = 0; k < infoCount; ++k) { IntPtr valuePtr = ADP.IntPtrOffset(infoPtr, (k * ODB.SizeOf_tagDBPROPINFO) + ODB.OffsetOf_tagDBPROPINFO_Value); SafeNativeMethods.VariantClear(valuePtr); } SafeNativeMethods.CoTaskMemFree(infoPtr); // was allocated by provider } } SafeNativeMethods.CoTaskMemFree(ptr); } ptr = this.descBuffer; this.descBuffer = IntPtr.Zero; if (IntPtr.Zero != ptr) { SafeNativeMethods.CoTaskMemFree(ptr); } return true; } internal static Type FromVtType(int vartype) { switch((VarEnum)vartype) { case VarEnum.VT_EMPTY: return null; case VarEnum.VT_NULL: return typeof(System.DBNull); case VarEnum.VT_I2: return typeof(System.Int16); case VarEnum.VT_I4: return typeof(System.Int32); case VarEnum.VT_R4: return typeof(System.Single); case VarEnum.VT_R8: return typeof(System.Double); case VarEnum.VT_CY: return typeof(System.Decimal); case VarEnum.VT_DATE: return typeof(System.DateTime); case VarEnum.VT_BSTR: return typeof(System.String); case VarEnum.VT_DISPATCH: return typeof(System.Object); case VarEnum.VT_ERROR: return typeof(System.Int32); case VarEnum.VT_BOOL: return typeof(System.Boolean); case VarEnum.VT_VARIANT: return typeof(System.Object); case VarEnum.VT_UNKNOWN: return typeof(System.Object); case VarEnum.VT_DECIMAL: return typeof(System.Decimal); case VarEnum.VT_I1: return typeof(System.SByte); case VarEnum.VT_UI1: return typeof(System.Byte); case VarEnum.VT_UI2: return typeof(System.UInt16); case VarEnum.VT_UI4: return typeof(System.UInt32); case VarEnum.VT_I8: return typeof(System.Int64); case VarEnum.VT_UI8: return typeof(System.UInt64); case VarEnum.VT_INT: return typeof(System.Int32); case VarEnum.VT_UINT: return typeof(System.UInt32); default: return typeof(System.Object); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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