// Remove all block for this file.
internal static void TruncateBlocks(DbFileContext db, long fileId)
{
// Detach blocks in memory.
var memBlocks = db.FileBlockSet.Local.Where(o => o.FileId == fileId).ToList();
memBlocks.ForEach(obj => db.Detach(obj));
// Remove all blocks.
string colName = DbHelper.ColumnName <DbFileBlock>(o => o.FileId);
string cond = string.Format("where {0} = {1}", colName, fileId);
db.TTDelete(typeof(DbFileBlock), cond);
}
