コード例 #1
0
        public void Can_replace_QueryableDefaultIfEmpty_method()
        {
            var baseQuery = new List <TestSubject>().AsQueryable();
            var query     = baseQuery.DefaultIfEmpty();

            var visitor    = new DefaultIfEmptyRewriter();
            var expression = visitor.Visit(query.Expression);

            var call = Assert.IsAssignableFrom <MethodCallExpression>(expression);

            Assert.Equal("DefaultIfEmpty", call.Method.Name);
            Assert.Equal(2, call.Arguments.Count);
        }
コード例 #2
0
        public void Can_provide_default_value()
        {
            var baseQuery = new List <TestSubject>().AsQueryable();
            var query     = baseQuery.DefaultIfEmpty();

            var visitor    = new DefaultIfEmptyRewriter();
            var expression = visitor.Visit(query.Expression);

            var call = Assert.IsAssignableFrom <MethodCallExpression>(expression);

            Assert.Equal("DefaultIfEmpty", call.Method.Name);
            var constant = Assert.IsAssignableFrom <ConstantExpression>(call.Arguments[1]);

            Assert.IsType <TestSubject>(constant.Value);
        }
コード例 #3
0
        public void Can_replace_EnumerableDefaultIfEmpty_method()
        {
            var baseQuery = new List <TestSubject>().AsQueryable();

            var query = from x in baseQuery
                        join y in baseQuery on x.Id equals y.ParentId into z
                        from q in z.DefaultIfEmpty()
                        select new { x.Name, ParentName = q.Name };

            var visitor    = new DefaultIfEmptyRewriter();
            var expression = visitor.Visit(query.Expression);

            var selectMany = (MethodCallExpression)expression;
            var call       = ((MethodCallExpression)((LambdaExpression)((UnaryExpression)selectMany.Arguments[1]).Operand).Body);

            Assert.Equal("DefaultIfEmpty", call.Method.Name);
            Assert.Equal(2, call.Arguments.Count);
        }