DataTable.Compute() raising an exception in C# WinUI

Question

I am creating a simple calculator app in WinUI with C#. I am using the Compute method in DataTable to solve the arithmetic problem. AnswerBox is a label where numbers and operators are appended, and an answer is displayed (using the compute function) when a button is clicked.

AnswerBox.Text = (string)new DataTable().Compute(AnswerBox.Text, "");

It raises an exception when I enter 2+2 (or any other valid expression) in the label. The exception is not shown in vs2022, the app crashes and opens the App.g.i.cs file showing the following.

#if DEBUG && !DISABLE_XAML_GENERATED_BREAK_ON_UNHANDLED_EXCEPTION
            UnhandledException += (sender, e) =>
            {
                if (global::System.Diagnostics.Debugger.IsAttached) global::System.Diagnostics.Debugger.Break();
            };
#endif 

Answer 1

In this case, the following code returns an int value, 4 to be specific.

new DataTable().Compute(AnswerBox.Text, "");

The issue is that you can't just cast int to string.

The next code should work:

var dataTable = new DataTable();

if (dataTable.Compute(AnswerBox.Text, "") is int coputeResult)
{
    AnswerBox.Text = coputeResult.ToString();
}