/// <summary>
/// Visits the Linq aggregate methods.
/// </summary>
/// <param name="expression">The expression.</param>
/// <param name="aggregateName">Name of aggreage method.</param>
protected virtual Expression VisitAggregate(MethodCallExpression expression, string aggregateName)
{
LinqStringBuilder.Append($"{aggregateName}(");
this.Visit(StripQuotes(expression.Arguments[1]));
LinqStringBuilder.Append(")");
SelectExpression.SetColumnsExpression(new ColumnsExpression(LinqStringBuilder.ToString()));
LinqStringBuilder.Clear();
return(expression);
}
private Expression VisitOrderBy(MethodCallExpression expression, OrderType orderType)
{
var lambda = (LambdaExpression)StripQuotes(expression.Arguments[1]);
var ret = Visit(lambda);
Orders.Add(LinqStringBuilder.ToString() + " " + (orderType == OrderType.Ascending ? "ASC" : "DESC"));
LinqStringBuilder.Clear();
return(ret);
}
/// <summary>
/// Visits the Linq Where method.
/// </summary>
/// <param name="expression">The expression.</param>
protected virtual Expression VisitWhere(MethodCallExpression expression)
{
LambdaExpression lambda = (LambdaExpression)StripQuotes(expression.Arguments[1]);
this.Visit(lambda.Body);
SelectExpression.SetWhereExpression(new WhereExpression(LinqStringBuilder.ToString(), LinqParameters.GetParams()));
LinqParameters.Clear();
LinqStringBuilder = null;
return(expression);
}
private Expression VisitOrderBy(MethodCallExpression expression, OrderType orderType)
{
var lambda = (LambdaExpression)StripQuotes(expression.Arguments[1]);
var ret = this.Visit(lambda);
_orders.Add(new OrderBy()
{
ColumnaName = LinqStringBuilder.ToString(), Type = orderType
});
LinqStringBuilder.Clear();
return(ret);
}