コード例 #1
0
        public void Transform_WithTwoArgument_TypeString()
        {
            var method           = typeof(string).GetMethod("IndexOf", new[] { typeof(string), typeof(int) });
            var objectExpression = Expression.Constant("Test");

            var argument1   = Expression.Constant("es");
            var argument2   = Expression.Constant(2);
            var expression  = Expression.Call(objectExpression, method, argument1, argument2);
            var transformer = new IndexOfMethodCallTransformer();
            var result      = transformer.Transform(expression);

            var startIndexExpression = Expression.Add(argument2, new SqlLiteralExpression(1));

            var lenArgExpression  = new SqlLengthExpression(argument1);
            var leftTestPredicate = Expression.Equal(lenArgExpression, new SqlLiteralExpression(0));

            var lenObjectExpression = new SqlLengthExpression(objectExpression);
            var rightTestpredicate  = Expression.LessThanOrEqual(startIndexExpression, lenObjectExpression);
            var testPredicate       = Expression.AndAlso(leftTestPredicate, rightTestpredicate);

            var charIndexExpression = new SqlFunctionExpression(
                expression.Type, "CHARINDEX", argument1, objectExpression, startIndexExpression);

            var elseValue = Expression.Subtract(charIndexExpression, new SqlLiteralExpression(1));

            var expectedResult = Expression.Condition(testPredicate, argument2, elseValue);

            SqlExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
        }
コード例 #2
0
        public void Transform_WithOneArgument_TypeChar()
        {
            var method           = typeof(string).GetMethod("IndexOf", new[] { typeof(char) });
            var objectExpression = Expression.Constant("Test");

            var argument1   = Expression.Constant('e');
            var expression  = Expression.Call(objectExpression, method, argument1);
            var transformer = new IndexOfMethodCallTransformer();
            var result      = transformer.Transform(expression);

            var lenExpression       = new SqlLengthExpression(argument1);
            var testPredicate       = Expression.Equal(lenExpression, new SqlLiteralExpression(0));
            var charIndexExpression = new SqlFunctionExpression(
                expression.Type, "CHARINDEX", argument1, objectExpression);
            var elseValue = Expression.Subtract(charIndexExpression, new SqlLiteralExpression(1));

            var expectedResult = Expression.Condition(testPredicate, new SqlLiteralExpression(0), elseValue);

            SqlExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
        }