public static IQueryable GroupJoin(this IQueryable outer, IQueryable inner, Func <ParameterExpression, Expression> outerKeySelector, Func <ParameterExpression, Expression> innerKeySelector, Func <ParameterExpression, ParameterExpression, Expression> resultSelector)
{
var touter = outer.ElementType;
var tinner = inner.ElementType;
var outerKeySelectorExpr = ExpressionEx.Func(touter.AsParameter(), outerKeySelector);
var innerKeySelectorExpr = ExpressionEx.Func(tinner.AsParameter(), innerKeySelector);
var resultSelectorExpr = ExpressionEx.Func(touter.AsParameter(), tinner.AsEnumerableType().AsParameter(), resultSelector);
var tkey = outerKeySelectorExpr.ReturnType;
return(outer.Transform(outer.CallQueryable("GroupJoin", new Type[] { touter, tinner, tkey, resultSelectorExpr.ReturnType }, inner.Expression, outerKeySelectorExpr.Quote(), innerKeySelectorExpr.Quote(), resultSelectorExpr.Quote())));
}
public static IQueryable GroupJoin(this IQueryable outer, IQueryable inner, LambdaExpression outerKeySelector, LambdaExpression innerKeySelector)
{
var touter = outer.ElementType;
var tinner = inner.ElementType;
var tkey = outerKeySelector.ReturnType;
var resultSelectorExpression = ExpressionEx.Func(
touter.AsParameter(),
typeof(IEnumerable <>).MakeGenericType(tinner).AsParameter(),
(element, joinedElements) => GenericGroupJoinItem.CreateNewExpression(element, joinedElements)
);
return(outer.Transform(outer.CallQueryable("GroupJoin", new Type[] { touter, tinner, tkey, resultSelectorExpression.ReturnType }, inner.Expression, outerKeySelector.Quote(), innerKeySelector.Quote(), resultSelectorExpression.Quote())));
}
public static IQueryable Join(this IQueryable outer, IQueryable inner, LambdaExpression outerKeySelectorExpr, LambdaExpression innerKeySelectorExpr, Func <ParameterExpression, ParameterExpression, Expression> resultSelector = null)
{
var touter = outer.ElementType;
var tinner = inner.ElementType;
var tkey = outerKeySelectorExpr.ReturnType;
if (resultSelector == null)
{
resultSelector = (left, right) => GenericJoinItem.CreateNewExpression(left, right);
}
var resultSelectorExpr = ExpressionEx.Func(touter.AsParameter(), tinner.AsParameter(), resultSelector);
return(outer.Transform(outer.CallQueryable("Join", new Type[] { touter, tinner, tkey, resultSelectorExpr.ReturnType }, inner.Expression, outerKeySelectorExpr.Quote(), innerKeySelectorExpr.Quote(), resultSelectorExpr.Quote())));
}
public static IQueryable Join(this IQueryable outer, IQueryable inner, Func <ParameterExpression, Expression> outerKeySelector, Func <ParameterExpression, Expression> innerKeySelector, Func <ParameterExpression, ParameterExpression, Expression> resultSelector = null)
{
var touter = outer.ElementType;
var tinner = inner.ElementType;
return(outer.Join(inner, ExpressionEx.Func(touter.AsParameter(), outerKeySelector), ExpressionEx.Func(tinner.AsParameter(), innerKeySelector), resultSelector));
}
public static IQueryable Where(this IQueryable items, Func <ParameterExpression, Expression> predicate)
{
var res = items.Transform(items.CallQueryable("Where", Expression.Quote(ExpressionEx.Predicate(items.ElementType, predicate))));
return(res);
}
