internal void CompileExpression (string expression)
{
if (expression != String.Empty) {
if (AutoIncrement || Unique)
throw new ArgumentException ("Cannot create an expression on a column that has AutoIncrement or Unique.");
if (Table != null) {
for (int i = 0; i < Table.Constraints.Count; i++) {
if (Table.Constraints [i].IsColumnContained (this))
throw new ArgumentException (
String.Format (
"Cannot set Expression property on column {0}, because it is a part of a constraint.",
ColumnName));
}
}
Parser parser = new Parser ();
IExpression compiledExpression = parser.Compile (expression);
if (Table != null) {
if (compiledExpression.DependsOn (this))
throw new ArgumentException ("Cannot set Expression property due to circular reference in the expression.");
// Check if expression is ok
if (Table.Rows.Count == 0)
compiledExpression.Eval (Table.NewRow ());
else
compiledExpression.Eval (Table.Rows [0]);
}
ReadOnly = true;
_compiledExpression = compiledExpression;
} else {
_compiledExpression = null;
if (Table != null) {
int defaultValuesRowIndex = Table.DefaultValuesRowIndex;
if (defaultValuesRowIndex != -1)
DataContainer.FillValues (defaultValuesRowIndex);
}
}
}