Getting Object reference not set to an instance of an object.

Question

Hi, 

I was trying to automate a windows app from scratch and not using the recording feature. I used the calculator application from window.

Was getting the below error

Test method SampleTest.CalculatorTest.launchCalculator threw exception: 
System.NullReferenceException: Object reference not set to an instance of an object.

PFB my code below

namespace SampleTest
{
    [CodedUITest]
    public class CalculatorTest
    {

        [TestMethod]
        public void launchCalculator()
        {

            ApplicationUnderTest.Launch("C:\\Windows\\System32\\calc.exe");
            WinWindow UICalcWindow = new WinWindow();
            UICalcWindow.SearchProperties[WinWindow.PropertyNames.Name] = "Calculator";
            UICalcWindow.SearchProperties[WinWindow.PropertyNames.ClassName] = "CalcFrame";
            UICalcWindow.WindowTitles.Add("Calculator");
            Console.WriteLine(UICalcWindow.Name.ToString());

        }


    }

Answer 1

Can you put some wait after launching the application; On my machine same code is working without any issue.

Thanks

---

Aditya Kumar Agrawal (MSFT)

Answer 2

I put a sleep time of 5000 ms after the launch of the application. Still getting the same error

if possible could you upload load your sln file, so that i can see if i am missing some references

Answer 3

Or could it be problem of the framework i have chosen while creating the project

I chose .net 4

Answer 4

CodedUITest works with .NET v4.0;

Can you call UICalcWindow.DrawHighlight() to check which window it is highlighting ?

---

Aditya Kumar Agrawal (MSFT)

Answer 5

i cannot use any of the methods of  UICalcWindow, all of it gives me the null reference exception

Answer 6

Thanks for Aditya’s friendly assistance.

Hi Nikhil,

Thank you for posting in the MSDN forum.

1. We would make sure that the steps are correct when we create a coded UI test, for detailed information, see Mathew’s blog about “Hand-coding a Coded UI Test”.
2. Like Vinoth’s suggestion, make sure all the related assemblies added as reference with Copy Local property as False. See “Object Exists but get a null reference trying to interact with it.”

Best Regards,

---

Jack Zhai [MSFT]
MSDN Community Support | Feedback to us

Answer 7

Thanks Jack and Aditya. Solved my issue . Appreciate the concern shown.

Answer 8

i had to set the Copy Local property as False, as it was True by default.