/// <summary>
/// 判断是否存在引用
/// </summary>
/// <param name="db">数据库上下文</param>
/// <param name="field">字典表对象</param>
/// <returns>是否存在引用（true:是，false:否）</returns>
public bool ExistsReference(SysEntities db, SysField field)
{
bool bResult = false;
if (db != null && field != null)
{
String sql = String.Format("select Value o from SysEntities.{0} as o where o.{1}=@id", field.MyTables, field.MyColums);
var reader = db.CreateQuery <DbDataReader>(sql, new ObjectParameter("id", field.Id));
bResult = reader.Count() > 0;
}
return(bResult);
}