How to Handle Conditional Operator Assignment with Nullable Types in C#?

Conditional Operator Assignment with Nullable Types

In an attempt to simplify code, developers often encounter a challenge when assigning values to properties with nullable types using the conditional operator. The following code snippet demonstrates this issue:

EmployeeNumber =
string.IsNullOrEmpty(employeeNumberTextBox.Text)
    ? null
    : Convert.ToInt32(employeeNumberTextBox.Text),

In this scenario, EmployeeNumber is a Nullable, and the compiler raises an error:

There is no implicit conversion between 'null' and 'int'

Despite the fact that both null and int are valid values for a nullable integer, the compiler cannot determine the type of the expression based solely on the true/false values.

To resolve this issue, one must explicitly cast one of the values to the desired nullable type, allowing the compiler to determine the expression's type:

EmployeeNumber =
    string.IsNullOrEmpty(employeeNumberTextBox.Text)
    ? (int?)null
    : Convert.ToInt32(employeeNumberTextBox.Text),

or

EmployeeNumber =
    string.IsNullOrEmpty(employeeNumberTextBox.Text)
    ? null
    : (int?)Convert.ToInt32(employeeNumberTextBox.Text),

These modifications ensure that the expression's type is correctly inferred, allowing the conditional operator to be used as intended.

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