I want the EmployeeNumber property for an Employee to only be set by the database, but I need to be able to set the value for unit testing. Which is why I made the helper code below.

Can someone help me troubleshoot & fix this?

Cheers,

Berryl

Helper Code

public static void SetEmployeeNumberFor(Employee employee, EmployeeNumber employeeNumber)
    {
        var empNumberProperty = employee.GetType().GetProperty("EmployeeNumber", BindingFlags.Public | BindingFlags.Instance);

        Check.Invariant(empNumberProperty != null);
        Check.Invariant(empNumberProperty.PropertyType.Equals(typeof(EmployeeNumber)));

        empNumberProperty.SetValue(empNumberProperty, employeeNumber, null);
    }

Full Exception

System.Reflection.TargetException : Object does not match target type.
at System.Reflection.RuntimeMethodInfo.CheckConsistency(Object target)
at System.Reflection.RuntimeMethodInfo.Invoke(Object开发者_运维百科 obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
TestableEmployee.cs(36,0): at Smack.ConstructionAdmin.TestingSupport.ResourceHelper.SetEmployeeNumberFor(Employee employee, EmployeeNumber employeeNumber)
TestableEmployee.cs(47,0): at Smack.ConstructionAdmin.TestingSupport.ResourceHelperTests.SetEmployeeNumberFor()

EmployeeNumber property code

    public virtual EmployeeNumber EmployeeNumber {
        get { return _employeeNumber; } 
        protected set {
            _employeeNumber = value;
            //base.BusinessId = _employeeNumber;
        }
    }
    private EmployeeNumber _employeeNumber;

Try using this instead:

empNumberProperty.SetValue(employee, employeeNumber, null);

The issue is that the first parameter of SetValue is the object that your trying to modify.

While looking at the MSDN Documentation, I also noticed that this method can throw a MethodAccessException if "there was an illegal attempt to access a private or protected method inside a class" which seems like it would apply in this situation. In the remarks section, this notice appears:

Starting with the .NET Framework version 2.0 Service Pack 1, this method can be used to access non-public members if the caller has been granted ReflectionPermission with the ReflectionPermissionFlag.RestrictedMemberAccess flag and if the grant set of the non-public members is restricted to the caller’s grant set, or a subset thereof. To use this functionality, your application should target the .NET Framework version 3.5 or later.

Alternatively, you could try using GetSetMethod(bool), but that would still be subject to the same security restrictions.

empNumberProperty.GetSetMethod(true).Invoke(employee, new[] { employeeNumber });

empNumberProperty.SetValue(empNumberProperty, employeeNumber, null);

Should be

 empNumberProperty.SetValue(employee, employeeNumber, null);