NGWS SDK Documentation  

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Compiler Error CS0192

A readonly field cannot be passed ref or out (except in a constructor)

A field (variable) marked with the readonly keyword cannot be passed either to a ref or out parameter except inside a constructor.

The following sample generates CS0192:

class MyClass {
   public readonly int TestInt = 6;

   static void TestMethod(ref int testInt) {
      testInt = 0;
   }

   MyClass() {
      TestMethod(ref TestInt);   // OK
   }

   public void PassReadOnlyRef() {
      TestMethod(ref TestInt);   // CS0192
   }

   public static void Main() {
   }
}

You can also get CS0192 if the readonly field is static and the constructor is not marked static.