|
public Add ( object value ) : |
||
| value | object | The object to pin. |
| return | ||
public void VerifyAddGivesDifferentPointers()
{
using (var handles = new GCHandleCollection())
{
IntPtr p1 = handles.Add("foo");
IntPtr p2 = handles.Add("bar");
Assert.AreNotEqual(p1, p2);
}
}
public void VerifyAddingNullReturnsIntPtrZero()
{
using (var handles = new GCHandleCollection())
{
IntPtr p = handles.Add(null);
Assert.AreEqual(IntPtr.Zero, p);
}
}
public void VerifyAddGivesPointerToObject()
{
using (var handles = new GCHandleCollection())
{
IntPtr p = handles.Add("expected");
string actual = Marshal.PtrToStringUni(p);
Assert.AreEqual("expected", actual);
}
}
public void VerifyAddPinsObject()
{
var expected = new string('x', 5);
var weakref = new WeakReference(expected);
using (var handles = new GCHandleCollection())
{
handles.Add(expected);
expected = null;
GC.Collect();
Assert.IsTrue(weakref.IsAlive);
}
}
/// <summary>
/// Make native indexcreate structures from the managed ones.
/// </summary>
/// <param name="managedIndexCreates">Index create structures to convert.</param>
/// <param name="handles">The handle collection used to pin the data.</param>
/// <returns>Pinned native versions of the index creates.</returns>
private static unsafe NATIVE_INDEXCREATE3[] GetNativeIndexCreate3s(
IList <JET_INDEXCREATE> managedIndexCreates,
ref GCHandleCollection handles)
{
NATIVE_INDEXCREATE3[] nativeIndices = null;
if (managedIndexCreates != null && managedIndexCreates.Count > 0)
{
nativeIndices = new NATIVE_INDEXCREATE3[managedIndexCreates.Count];
for (int i = 0; i < managedIndexCreates.Count; ++i)
{
nativeIndices[i] = managedIndexCreates[i].GetNativeIndexcreate3();
if (null != managedIndexCreates[i].pidxUnicode)
{
NATIVE_UNICODEINDEX2 unicode = managedIndexCreates[i].pidxUnicode.GetNativeUnicodeIndex2();
unicode.szLocaleName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].pidxUnicode.GetEffectiveLocaleName()));
nativeIndices[i].pidxUnicode = (NATIVE_UNICODEINDEX2 *)handles.Add(unicode);
nativeIndices[i].grbit |= (uint)VistaGrbits.IndexUnicode;
}
nativeIndices[i].szKey = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szKey));
nativeIndices[i].szIndexName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szIndexName));
nativeIndices[i].rgconditionalcolumn = GetNativeConditionalColumns(managedIndexCreates[i].rgconditionalcolumn, true, ref handles);
// Convert pSpaceHints.
if (managedIndexCreates[i].pSpaceHints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = managedIndexCreates[i].pSpaceHints.GetNativeSpaceHints();
nativeIndices[i].pSpaceHints = handles.Add(nativeSpaceHints);
}
}
}
return(nativeIndices);
}
public void GCHandleCollectionStress()
{
for (int i = 0; i < 1000; i++)
{
using (var handles = new GCHandleCollection())
{
for (int j = 0; j < 100; j++)
{
IntPtr p = handles.Add(new byte[1]);
Assert.AreNotEqual(IntPtr.Zero, p);
}
}
}
}
/// <summary>
/// Creates a temporary table with a single index. A temporary table
/// stores and retrieves records just like an ordinary table created
/// using JetCreateTableColumnIndex. However, temporary tables are
/// much faster than ordinary tables due to their volatile nature.
/// They can also be used to very quickly sort and perform duplicate
/// removal on record sets when accessed in a purely sequential manner.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="temporarytable">
/// Description of the temporary table to create on input. After a
/// successful call, the structure contains the handle to the temporary
/// table and column identifications.
/// </param>
/// <returns>An error code.</returns>
public int JetOpenTemporaryTable2(JET_SESID sesid, JET_OPENTEMPORARYTABLE temporarytable)
{
TraceFunctionCall();
this.CheckSupportsWindows8Features("JetOpenTemporaryTable2");
CheckNotNull(temporarytable, "temporarytable");
NATIVE_OPENTEMPORARYTABLE2 nativetemporarytable = temporarytable.GetNativeOpenTemporaryTable2();
var nativecolumnids = new uint[nativetemporarytable.ccolumn];
NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(temporarytable.prgcolumndef, temporarytable.ccolumn);
unsafe
{
using (var gchandlecollection = new GCHandleCollection())
{
// Pin memory
nativetemporarytable.prgcolumndef = (NATIVE_COLUMNDEF *)gchandlecollection.Add(nativecolumndefs);
nativetemporarytable.rgcolumnid = (uint *)gchandlecollection.Add(nativecolumnids);
if (null != temporarytable.pidxunicode)
{
NATIVE_UNICODEINDEX2 unicode = temporarytable.pidxunicode.GetNativeUnicodeIndex2();
unicode.szLocaleName = gchandlecollection.Add(Util.ConvertToNullTerminatedUnicodeByteArray(temporarytable.pidxunicode.GetEffectiveLocaleName()));
nativetemporarytable.pidxunicode = (NATIVE_UNICODEINDEX2 *)gchandlecollection.Add(unicode);
}
// Call the interop method
int err = Err(NativeMethods.JetOpenTemporaryTable2(sesid.Value, ref nativetemporarytable));
// Convert the return values
SetColumnids(temporarytable.prgcolumndef, temporarytable.prgcolumnid, nativecolumnids, temporarytable.ccolumn);
temporarytable.tableid = new JET_TABLEID {
Value = nativetemporarytable.tableid
};
return(err);
}
}
}
public void VerifyDisposeUnpinsObjects()
{
var expected = new string('x', 5);
var weakref = new WeakReference(expected);
using (var handles = new GCHandleCollection())
{
handles.Add(expected);
expected = null; // needed to allow GC to work
}
GC.Collect();
Assert.IsFalse(weakref.IsAlive);
}
/// <summary>
/// Creates a table, adds columns, and indices on that table.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="dbid">The database to which to add the new table.</param>
/// <param name="tablecreate">Object describing the table to create.</param>
/// <returns>An error if the call fails.</returns>
private static int CreateTableColumnIndex4(
JET_SESID sesid,
JET_DBID dbid,
JET_TABLECREATE tablecreate)
{
NATIVE_TABLECREATE4 nativeTableCreate = tablecreate.GetNativeTableCreate4();
unsafe
{
var handles = new GCHandleCollection();
try
{
// Convert/pin the column definitions.
nativeTableCreate.rgcolumncreate = (NATIVE_COLUMNCREATE *)GetNativeColumnCreates(tablecreate.rgcolumncreate, true, ref handles);
// Convert/pin the index definitions.
NATIVE_INDEXCREATE3[] nativeIndexCreates = GetNativeIndexCreate3s(tablecreate.rgindexcreate, ref handles);
nativeTableCreate.rgindexcreate = handles.Add(nativeIndexCreates);
// Convert/pin the space hints.
if (tablecreate.pSeqSpacehints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pSeqSpacehints.GetNativeSpaceHints();
nativeTableCreate.pSeqSpacehints = (NATIVE_SPACEHINTS *)handles.Add(nativeSpaceHints);
}
if (tablecreate.pLVSpacehints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pLVSpacehints.GetNativeSpaceHints();
nativeTableCreate.pLVSpacehints = (NATIVE_SPACEHINTS *)handles.Add(nativeSpaceHints);
}
int err = NativeMethods.JetCreateTableColumnIndex4W(sesid.Value, dbid.Value, ref nativeTableCreate);
// Modified fields.
tablecreate.tableid = new JET_TABLEID
{
Value = nativeTableCreate.tableid
};
tablecreate.cCreated = checked ((int)nativeTableCreate.cCreated);
if (tablecreate.rgcolumncreate != null)
{
for (int i = 0; i < tablecreate.rgcolumncreate.Length; ++i)
{
tablecreate.rgcolumncreate[i].SetFromNativeColumnCreate(ref nativeTableCreate.rgcolumncreate[i]);
}
}
if (tablecreate.rgindexcreate != null)
{
for (int i = 0; i < tablecreate.rgindexcreate.Length; ++i)
{
tablecreate.rgindexcreate[i].SetFromNativeIndexCreate(ref nativeIndexCreates[i]);
}
}
return(Err(err));
}
finally
{
handles.Dispose();
}
}
}
/// <summary>
/// Gets the NATIVE_indexcolumn structure that represents the object.
/// </summary>
/// <param name="handles">GC handle collection to add any pinned handles.</param>
/// <returns>The NATIVE_indexcolumn structure.</returns>
internal NATIVE_INDEX_COLUMN GetNativeIndexColumn(ref GCHandleCollection handles)
{
NATIVE_INDEX_COLUMN indexColumn = new NATIVE_INDEX_COLUMN();
indexColumn.columnid = this.columnid.Value;
indexColumn.relop = (uint)this.relop;
indexColumn.grbit = (uint)this.grbit;
if (this.pvData != null)
{
indexColumn.pvData = handles.Add(this.pvData);
indexColumn.cbData = (uint)this.pvData.Length;
}
return indexColumn;
}
/// <summary>
/// Creates a table, adds columns, and indices on that table.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="dbid">The database to which to add the new table.</param>
/// <param name="tablecreate">Object describing the table to create.</param>
/// <returns>An error if the call fails.</returns>
private static int CreateTableColumnIndex4(
JET_SESID sesid,
JET_DBID dbid,
JET_TABLECREATE tablecreate)
{
NATIVE_TABLECREATE4 nativeTableCreate = tablecreate.GetNativeTableCreate4();
unsafe
{
var handles = new GCHandleCollection();
try
{
// Convert/pin the column definitions.
nativeTableCreate.rgcolumncreate = (NATIVE_COLUMNCREATE*)GetNativeColumnCreates(tablecreate.rgcolumncreate, true, ref handles);
// Convert/pin the index definitions.
NATIVE_INDEXCREATE3[] nativeIndexCreates = GetNativeIndexCreate3s(tablecreate.rgindexcreate, ref handles);
nativeTableCreate.rgindexcreate = handles.Add(nativeIndexCreates);
// Convert/pin the space hints.
if (tablecreate.pSeqSpacehints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pSeqSpacehints.GetNativeSpaceHints();
nativeTableCreate.pSeqSpacehints = (NATIVE_SPACEHINTS*)handles.Add(nativeSpaceHints);
}
if (tablecreate.pLVSpacehints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = tablecreate.pLVSpacehints.GetNativeSpaceHints();
nativeTableCreate.pLVSpacehints = (NATIVE_SPACEHINTS*)handles.Add(nativeSpaceHints);
}
int err = NativeMethods.JetCreateTableColumnIndex4W(sesid.Value, dbid.Value, ref nativeTableCreate);
// Modified fields.
tablecreate.tableid = new JET_TABLEID
{
Value = nativeTableCreate.tableid
};
tablecreate.cCreated = checked((int)nativeTableCreate.cCreated);
if (tablecreate.rgcolumncreate != null)
{
for (int i = 0; i < tablecreate.rgcolumncreate.Length; ++i)
{
tablecreate.rgcolumncreate[i].SetFromNativeColumnCreate(nativeTableCreate.rgcolumncreate[i]);
}
}
if (tablecreate.rgindexcreate != null)
{
for (int i = 0; i < tablecreate.rgindexcreate.Length; ++i)
{
tablecreate.rgindexcreate[i].SetFromNativeIndexCreate(nativeIndexCreates[i]);
}
}
return Err(err);
}
finally
{
handles.Dispose();
}
}
}
/// <summary>
/// Make native indexcreate structures from the managed ones.
/// </summary>
/// <param name="managedIndexCreates">Index create structures to convert.</param>
/// <param name="handles">The handle collection used to pin the data.</param>
/// <returns>Pinned native versions of the index creates.</returns>
private static unsafe NATIVE_INDEXCREATE3[] GetNativeIndexCreate3s(
IList<JET_INDEXCREATE> managedIndexCreates,
ref GCHandleCollection handles)
{
NATIVE_INDEXCREATE3[] nativeIndices = null;
if (managedIndexCreates != null && managedIndexCreates.Count > 0)
{
nativeIndices = new NATIVE_INDEXCREATE3[managedIndexCreates.Count];
for (int i = 0; i < managedIndexCreates.Count; ++i)
{
nativeIndices[i] = managedIndexCreates[i].GetNativeIndexcreate3();
if (null != managedIndexCreates[i].pidxUnicode)
{
NATIVE_UNICODEINDEX2 unicode = managedIndexCreates[i].pidxUnicode.GetNativeUnicodeIndex2();
unicode.szLocaleName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].pidxUnicode.GetEffectiveLocaleName()));
nativeIndices[i].pidxUnicode = (NATIVE_UNICODEINDEX2*)handles.Add(unicode);
nativeIndices[i].grbit |= (uint)VistaGrbits.IndexUnicode;
}
nativeIndices[i].szKey = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szKey));
nativeIndices[i].szIndexName = handles.Add(Util.ConvertToNullTerminatedUnicodeByteArray(managedIndexCreates[i].szIndexName));
nativeIndices[i].rgconditionalcolumn = GetNativeConditionalColumns(managedIndexCreates[i].rgconditionalcolumn, true, ref handles);
// Convert pSpaceHints.
if (managedIndexCreates[i].pSpaceHints != null)
{
NATIVE_SPACEHINTS nativeSpaceHints = managedIndexCreates[i].pSpaceHints.GetNativeSpaceHints();
nativeIndices[i].pSpaceHints = handles.Add(nativeSpaceHints);
}
}
}
return nativeIndices;
}
/// <summary>
/// If the records with the specified key ranges are not in the
/// buffer cache then start asynchronous reads to bring the records
/// into the database buffer cache.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The table to issue the prereads against.</param>
/// <param name="keysStart">The start of key ranges to preread.</param>
/// <param name="keyStartLengths">The lengths of the start keys to preread.</param>
/// <param name="keysEnd">The end of key rangess to preread.</param>
/// <param name="keyEndLengths">The lengths of the end keys to preread.</param>
/// <param name="rangeIndex">The index of the first key range in the array to read.</param>
/// <param name="rangeCount">The maximum number of key ranges to preread.</param>
/// <param name="rangesPreread">Returns the number of keys actually preread.</param>
/// <param name="columnsPreread">List of column ids for long value columns to preread.</param>
/// <param name="grbit">Preread options. Used to specify the direction of the preread.</param>
/// <returns>An error or warning.</returns>
public int JetPrereadKeyRanges(
JET_SESID sesid,
JET_TABLEID tableid,
byte[][] keysStart,
int[] keyStartLengths,
byte[][] keysEnd,
int[] keyEndLengths,
int rangeIndex,
int rangeCount,
out int rangesPreread,
JET_COLUMNID[] columnsPreread,
PrereadIndexRangesGrbit grbit)
{
TraceFunctionCall("JetPrereadKeyRanges");
this.CheckSupportsWindows8Features("JetPrereadKeyRanges");
CheckDataSize(keysStart, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
CheckDataSize(keyStartLengths, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
CheckNotNull(keysStart, "keysStart");
if (keysEnd != null)
{
CheckNotNull(keyEndLengths, "keyEndLengths");
CheckDataSize(keysEnd, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
}
if (keyEndLengths != null)
{
CheckNotNull(keysEnd, "keysEnd");
CheckDataSize(keyEndLengths, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
}
grbit = grbit | PrereadIndexRangesGrbit.NormalizedKey;
using (var handles = new GCHandleCollection())
{
NATIVE_INDEX_COLUMN[] startColumn;
NATIVE_INDEX_COLUMN[] endColumn;
NATIVE_INDEX_RANGE[] ranges = new NATIVE_INDEX_RANGE[rangeCount];
for (int i = 0; i < rangeCount; i++)
{
startColumn = new NATIVE_INDEX_COLUMN[1];
startColumn[0].pvData = handles.Add(keysStart[i + rangeIndex]);
startColumn[0].cbData = (uint)keyStartLengths[i + rangeIndex];
ranges[i].rgStartColumns = handles.Add(startColumn);
ranges[i].cStartColumns = 1;
if (keysEnd != null)
{
endColumn = new NATIVE_INDEX_COLUMN[1];
endColumn[0].pvData = handles.Add(keysEnd[i + rangeIndex]);
endColumn[0].cbData = (uint)keyEndLengths[i + rangeIndex];
ranges[i].rgEndColumns = handles.Add(endColumn);
ranges[i].cEndColumns = 1;
}
}
if (columnsPreread != null)
{
var nativecolumnids = new uint[columnsPreread.Length];
for (int i = 0; i < columnsPreread.Length; i++)
{
nativecolumnids[i] = (uint)columnsPreread[i].Value;
}
return Err(NativeMethods.JetPrereadIndexRanges(sesid.Value, tableid.Value, ranges, (uint)rangeCount, out rangesPreread, nativecolumnids, (uint)columnsPreread.Length, checked((uint)grbit)));
}
else
{
return Err(NativeMethods.JetPrereadIndexRanges(sesid.Value, tableid.Value, ranges, (uint)rangeCount, out rangesPreread, null, (uint)0, checked((uint)grbit)));
}
}
}
/// <summary>
/// Creates a temporary table with a single index. A temporary table
/// stores and retrieves records just like an ordinary table created
/// using JetCreateTableColumnIndex. However, temporary tables are
/// much faster than ordinary tables due to their volatile nature.
/// They can also be used to very quickly sort and perform duplicate
/// removal on record sets when accessed in a purely sequential manner.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="temporarytable">
/// Description of the temporary table to create on input. After a
/// successful call, the structure contains the handle to the temporary
/// table and column identifications.
/// </param>
/// <returns>An error code.</returns>
public int JetOpenTemporaryTable2(JET_SESID sesid, JET_OPENTEMPORARYTABLE temporarytable)
{
TraceFunctionCall("JetOpenTemporaryTable2");
this.CheckSupportsWindows8Features("JetOpenTemporaryTable2");
CheckNotNull(temporarytable, "temporarytable");
NATIVE_OPENTEMPORARYTABLE2 nativetemporarytable = temporarytable.GetNativeOpenTemporaryTable2();
var nativecolumnids = new uint[nativetemporarytable.ccolumn];
NATIVE_COLUMNDEF[] nativecolumndefs = GetNativecolumndefs(temporarytable.prgcolumndef, temporarytable.ccolumn);
unsafe
{
using (var gchandlecollection = new GCHandleCollection())
{
// Pin memory
nativetemporarytable.prgcolumndef = (NATIVE_COLUMNDEF*)gchandlecollection.Add(nativecolumndefs);
nativetemporarytable.rgcolumnid = (uint*)gchandlecollection.Add(nativecolumnids);
if (null != temporarytable.pidxunicode)
{
NATIVE_UNICODEINDEX2 unicode = temporarytable.pidxunicode.GetNativeUnicodeIndex2();
unicode.szLocaleName = gchandlecollection.Add(Util.ConvertToNullTerminatedUnicodeByteArray(temporarytable.pidxunicode.GetEffectiveLocaleName()));
nativetemporarytable.pidxunicode = (NATIVE_UNICODEINDEX2*)gchandlecollection.Add(unicode);
}
// Call the interop method
int err = Err(NativeMethods.JetOpenTemporaryTable2(sesid.Value, ref nativetemporarytable));
// Convert the return values
SetColumnids(temporarytable.prgcolumndef, temporarytable.prgcolumnid, nativecolumnids, temporarytable.ccolumn);
temporarytable.tableid = new JET_TABLEID { Value = nativetemporarytable.tableid };
return err;
}
}
}
public static JET_wrn JetSetColumns(JET_SESID sesid, JET_TABLEID tableid, JET_SETCOLUMN[] setcolumns, int numColumns)
{
if (null == setcolumns)
{
throw new ArgumentNullException("setcolumns");
}
if (numColumns < 0 || numColumns > setcolumns.Length)
{
throw new ArgumentOutOfRangeException("numColumns", numColumns, "cannot be negative or greater than setcolumns.Length");
}
using (var gchandles = new GCHandleCollection())
{
unsafe
{
NATIVE_SETCOLUMN* nativeSetColumns = stackalloc NATIVE_SETCOLUMN[numColumns];
// For performance, copy small amounts of data into a local buffer instead
// of pinning the data.
const int BufferSize = 128;
byte* buffer = stackalloc byte[BufferSize];
int bufferRemaining = BufferSize;
for (int i = 0; i < numColumns; ++i)
{
setcolumns[i].CheckDataSize();
nativeSetColumns[i] = setcolumns[i].GetNativeSetcolumn();
if (null == setcolumns[i].pvData)
{
nativeSetColumns[i].pvData = IntPtr.Zero;
}
else if (bufferRemaining >= setcolumns[i].cbData)
{
nativeSetColumns[i].pvData = new IntPtr(buffer);
Marshal.Copy(setcolumns[i].pvData, setcolumns[i].ibData, nativeSetColumns[i].pvData, setcolumns[i].cbData);
buffer += setcolumns[i].cbData;
bufferRemaining -= setcolumns[i].cbData;
Debug.Assert(bufferRemaining >= 0, "Buffer remaining is negative");
}
else
{
byte* pinnedBuffer = (byte*)gchandles.Add(setcolumns[i].pvData).ToPointer();
nativeSetColumns[i].pvData = new IntPtr(pinnedBuffer + setcolumns[i].ibData);
}
}
int err = Impl.JetSetColumns(sesid, tableid, nativeSetColumns, numColumns);
for (int i = 0; i < numColumns; ++i)
{
setcolumns[i].err = (JET_wrn)nativeSetColumns[i].err;
}
return Api.Check(err);
}
}
}
/// <summary>
/// If the records with the specified key ranges are not in the
/// buffer cache then start asynchronous reads to bring the records
/// into the database buffer cache.
/// </summary>
/// <param name="sesid">The session to use.</param>
/// <param name="tableid">The table to issue the prereads against.</param>
/// <param name="keysStart">The start of key ranges to preread.</param>
/// <param name="keyStartLengths">The lengths of the start keys to preread.</param>
/// <param name="keysEnd">The end of key rangess to preread.</param>
/// <param name="keyEndLengths">The lengths of the end keys to preread.</param>
/// <param name="rangeIndex">The index of the first key range in the array to read.</param>
/// <param name="rangeCount">The maximum number of key ranges to preread.</param>
/// <param name="rangesPreread">Returns the number of keys actually preread.</param>
/// <param name="columnsPreread">List of column ids for long value columns to preread.</param>
/// <param name="grbit">Preread options. Used to specify the direction of the preread.</param>
/// <returns>An error or warning.</returns>
public int JetPrereadKeyRanges(
JET_SESID sesid,
JET_TABLEID tableid,
byte[][] keysStart,
int[] keyStartLengths,
byte[][] keysEnd,
int[] keyEndLengths,
int rangeIndex,
int rangeCount,
out int rangesPreread,
JET_COLUMNID[] columnsPreread,
PrereadIndexRangesGrbit grbit)
{
TraceFunctionCall();
this.CheckSupportsWindows8Features("JetPrereadKeyRanges");
CheckDataSize(keysStart, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
CheckDataSize(keyStartLengths, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
CheckNotNull(keysStart, "keysStart");
if (keysEnd != null)
{
CheckNotNull(keyEndLengths, "keyEndLengths");
CheckDataSize(keysEnd, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
}
if (keyEndLengths != null)
{
CheckNotNull(keysEnd, "keysEnd");
CheckDataSize(keyEndLengths, rangeIndex, "rangeIndex", rangeCount, "rangeCount");
}
grbit = grbit | PrereadIndexRangesGrbit.NormalizedKey;
using (var handles = new GCHandleCollection())
{
NATIVE_INDEX_COLUMN[] startColumn;
NATIVE_INDEX_COLUMN[] endColumn;
NATIVE_INDEX_RANGE[] ranges = new NATIVE_INDEX_RANGE[rangeCount];
for (int i = 0; i < rangeCount; i++)
{
startColumn = new NATIVE_INDEX_COLUMN[1];
startColumn[0].pvData = handles.Add(keysStart[i + rangeIndex]);
startColumn[0].cbData = (uint)keyStartLengths[i + rangeIndex];
ranges[i].rgStartColumns = handles.Add(startColumn);
ranges[i].cStartColumns = 1;
if (keysEnd != null)
{
endColumn = new NATIVE_INDEX_COLUMN[1];
endColumn[0].pvData = handles.Add(keysEnd[i + rangeIndex]);
endColumn[0].cbData = (uint)keyEndLengths[i + rangeIndex];
ranges[i].rgEndColumns = handles.Add(endColumn);
ranges[i].cEndColumns = 1;
}
}
if (columnsPreread != null)
{
var nativecolumnids = new uint[columnsPreread.Length];
for (int i = 0; i < columnsPreread.Length; i++)
{
nativecolumnids[i] = (uint)columnsPreread[i].Value;
}
return(Err(NativeMethods.JetPrereadIndexRanges(sesid.Value, tableid.Value, ranges, (uint)rangeCount, out rangesPreread, nativecolumnids, (uint)columnsPreread.Length, checked ((uint)grbit))));
}
else
{
return(Err(NativeMethods.JetPrereadIndexRanges(sesid.Value, tableid.Value, ranges, (uint)rangeCount, out rangesPreread, null, (uint)0, checked ((uint)grbit))));
}
}
}
/// <summary>
/// Gets the NATIVE_indexcolumn structure that represents the object.
/// </summary>
/// <param name="handles">GC handle collection to add any pinned handles.</param>
/// <returns>The NATIVE_indexcolumn structure.</returns>
internal NATIVE_INDEX_RANGE GetNativeIndexRange(ref GCHandleCollection handles)
{
NATIVE_INDEX_RANGE indexRange = new NATIVE_INDEX_RANGE();
NATIVE_INDEX_COLUMN[] nativeColumns;
if (this.startColumns != null)
{
nativeColumns = new NATIVE_INDEX_COLUMN[this.startColumns.Length];
for (int i = 0; i < this.startColumns.Length; i++)
{
nativeColumns[i] = this.startColumns[i].GetNativeIndexColumn(ref handles);
}
indexRange.rgStartColumns = handles.Add(nativeColumns);
indexRange.cStartColumns = (uint)this.startColumns.Length;
}
if (this.endColumns != null)
{
nativeColumns = new NATIVE_INDEX_COLUMN[this.endColumns.Length];
for (int i = 0; i < this.endColumns.Length; i++)
{
nativeColumns[i] = this.endColumns[i].GetNativeIndexColumn(ref handles);
}
indexRange.rgEndColumns = handles.Add(nativeColumns);
indexRange.cEndColumns = (uint)this.endColumns.Length;
}
return indexRange;
}