Public Shared Function RecoverFile( _
   ByVal options As BPlusTree(Of TKey,TValue) _
) As Integer

public static int RecoverFile( 
   BPlusTree<TKey,TValue> options
)

BPlusTree<KeyInfo, DataValue>.Options options = new BPlusTree<KeyInfo, DataValue>.Options(
    new KeyInfoSerializer(), new DataValueSerializer(), new KeyInfoComparer());
options.CalcBTreeOrder(32, 300);
options.FileName = TempFile.TempPath;
options.CreateFile = CreatePolicy.Always;

using (TempFile copy = new TempFile())
{
    copy.Delete();
    int minRecordCreated = StartAndAbortWriters(options, copy);

    using (TempFile.Attach(copy.TempPath + ".recovered")) //used to create the new copy
    using (TempFile.Attach(copy.TempPath + ".deleted"))  //renamed existing file
    {
        options.CreateFile = CreatePolicy.Never;
        int recoveredRecords = BPlusTree<KeyInfo, DataValue>.RecoverFile(options);
        if (recoveredRecords < RecordsCreated)
            Assert.Fail("Unable to recover records, recieved ({0} of {1}).", recoveredRecords, RecordsCreated);

        options.FileName = copy.TempPath;
        recoveredRecords = BPlusTree<KeyInfo, DataValue>.RecoverFile(options);
        Assert.IsTrue(recoveredRecords >= minRecordCreated, "Expected at least " + minRecordCreated + " found " + recoveredRecords);

        using (BPlusTree<KeyInfo, DataValue> dictionary = new BPlusTree<KeyInfo, DataValue>(options))
        {
            dictionary.EnableCount();
            Assert.AreEqual(recoveredRecords, dictionary.Count);

            foreach (KeyValuePair<KeyInfo, DataValue> kv in dictionary)
            {
                Assert.AreEqual(kv.Key.UID, kv.Value.Key.UID);
                dictionary.Remove(kv.Key);
            }

            Assert.AreEqual(0, dictionary.Count);
        }
    }
}

Dim options As New BPlusTree(Of KeyInfo, DataValue).Options(New KeyInfoSerializer(), New DataValueSerializer(), New KeyInfoComparer())
options.CalcBTreeOrder(32, 300)
options.FileName = TempFile.TempPath
options.CreateFile = CreatePolicy.Always

Using copy As New TempFile()
    copy.Delete()
    Dim minRecordCreated As Integer = StartAndAbortWriters(options, copy)

    Using TempFile.Attach(copy.TempPath + ".recovered")
        'used to create the new copy
        Using TempFile.Attach(copy.TempPath + ".deleted")
            'renamed existing file
            options.CreateFile = CreatePolicy.Never
            Dim recoveredRecords As Integer = BPlusTree(Of KeyInfo, DataValue).RecoverFile(options)
            If recoveredRecords < RecordsCreated Then
                Assert.Fail("Unable to recover records, recieved ({0} of {1}).", recoveredRecords, RecordsCreated)
            End If

            options.FileName = copy.TempPath
            recoveredRecords = BPlusTree(Of KeyInfo, DataValue).RecoverFile(options)
            Assert.IsTrue(recoveredRecords >= minRecordCreated, "Expected at least " + minRecordCreated + " found " + recoveredRecords)

            Using dictionary As New BPlusTree(Of KeyInfo, DataValue)(options)
                dictionary.EnableCount()
                Assert.AreEqual(recoveredRecords, dictionary.Count)

                For Each kv As KeyValuePair(Of KeyInfo, DataValue) In dictionary
                    Assert.AreEqual(kv.Key.UID, kv.Value.Key.UID)
                    dictionary.Remove(kv.Key)
                Next

                Assert.AreEqual(0, dictionary.Count)
            End Using
        End Using
    End Using
End Using