Transform() public method

public Transform ( MethodCallExpression methodCallExpression ) : Expression
methodCallExpression System.Linq.Expressions.MethodCallExpression
return System.Linq.Expressions.Expression
InsertMethodCallTransformer Class Documentation
Example #1
0
    public void Transform ()
    {
      var method = typeof (string).GetMethod ("Insert", new[] { typeof(int), typeof(string) });
      var objectExpression = Expression.Constant ("Test");
      var argument1 = Expression.Constant(3);
      var argument2 = Expression.Constant("what");
      var expression = Expression.Call (objectExpression, method, argument1, argument2);
      var transformer = new InsertMethodCallTransformer ();

      var result = transformer.Transform (expression);

      var expectedTestExpression = Expression.Equal (new SqlLengthExpression (objectExpression), Expression.Add (argument1, new SqlLiteralExpression (1)));
      var concatMethod = typeof (string).GetMethod ("Concat", new[] { typeof (string), typeof (string) });
      var expectedThenExpression = Expression.Add (objectExpression, argument2, concatMethod);
      var expectedElseExpression = new SqlFunctionExpression (typeof (string), "STUFF", objectExpression, Expression.Add (argument1, new SqlLiteralExpression (1)), new SqlLiteralExpression(0), argument2);
      var expectedResult = Expression.Condition (expectedTestExpression, expectedThenExpression, expectedElseExpression);
      SqlExpressionTreeComparer.CheckAreEqualTrees (expectedResult, result);
    }