/// <exception cref="InvalidOperationException">Occurs when the serializer has trouble
/// deserializing the file on disk. Can occur if the file is corrupted.</exception>
public void Open()
{
if (File.Exists(this.filePath))
{
string json = File.ReadAllText(filePath);
MemoryIndex memoryIndex = JsonConvert.DeserializeObject <MemoryIndex>(json);
index.table = memoryIndex.table;
index.TextCount = memoryIndex.TextCount;
}
}