Is it possible to set this static private member of a static class with reflection?

Question

I have a static class with static private readonly member that's set via the class's static constructor. Below is a simplified example.

public static class MyClass {     private static readonly string m_myField;      static MyClass()     {         // logic to determine and set m_myField;     }      public static string MyField     {         get         {             // More logic to validate m_myField and then return it.         }     } } 

Since the above class is a static class, I cannot create an instance of it in order to utilize pass such into a FieldInfo.GetValue() call to retrieve and later set the value of m_myField. Is there a way I'm not aware to either get use the FieldInfo class to get and set the value on a static class or is the only option is to refactor the class I've been asked to unit test for?

Answer 1

Here is a quick example showing how to do it:

using System; using System.Reflection;  class Example {     static void Main()     {         var field = typeof(Foo).GetField("bar",                              BindingFlags.Static |                              BindingFlags.NonPublic);          // Normally the first argument to "SetValue" is the instance         // of the type but since we are mutating a static field we pass "null"         field.SetValue(null, "baz");     } }  static class Foo {     static readonly String bar = "bar"; }