/// <summary>
/// Returns the unique member whose column name is given, or null if no such member can
/// be found. If the collection contains several members with the same column name, even
/// if they belong to different tables, an exception is thrown by default.
/// </summary>
/// <param name="column">The column name.</param>
/// <param name="raise">True to raise an exception if several columns are found sharing
/// the same name. If false then null is returned in that case.</param>
/// <returns>The member found, or null.</returns>
public ISchemaEntry FindEntry(string column, bool raise = true)
{
if (IsDisposed)
{
throw new ObjectDisposedException(this.ToString());
}
column = Core.SchemaEntry.ValidateColumn(column);
var list = _Members.FindColumn(column);
if (list.Count == 0)
{
return(null);
}
if (list.Count == 1)
{
return(list[0]);
}
list.Clear(); list = null;
if (raise)
{
throw new DuplicateException(
"Column name '{0}' found in several entries: '{1}'.".FormatWith(column, list.Sketch()));
}
return(null);
}