public static Expression <Func <PrimaryKey, string> > GetToString <T>(CachedTableConstructor constructor, Expression <Func <T, string> > lambda)
{
Table table = (Table)constructor.table;
var param = lambda.Parameters.SingleEx();
if (param.Type != table.Type)
{
throw new InvalidOperationException("incorrect lambda paramer type");
}
var pk = Expression.Parameter(typeof(PrimaryKey), "pk");
var root = new CachedEntityExpression(pk, typeof(T), constructor, null, null);
var visitor = new ToStringExpressionVisitor(param, root);
var result = visitor.Visit(lambda.Body);
return(Expression.Lambda <Func <PrimaryKey, string> >(result, pk));
}
public static Expression GetToString(Table table, ParameterExpression reader, List <IColumn> columns)
{
LambdaExpression lambda = ExpressionCleaner.GetFieldExpansion(table.Type, CachedTableBase.ToStringMethod) !;
if (lambda == null)
{
columns.Add(table.ToStrColumn !);
return(FieldReader.GetExpression(reader, columns.Count - 1, typeof(string)));
}
ToStringExpressionVisitor toStr = new ToStringExpressionVisitor(
lambda.Parameters.SingleEx(),
reader,
columns,
table
);
var result = toStr.Visit(lambda.Body);
return(result);
}
