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Fields of static readonly field 'name' cannot be passed ref or out (except in a static constructor)
A field (variable) marked with the readonly keyword cannot be passed either to a ref or out parameter except inside a constructor. For more information, see Fields (C# Programming Guide).
CS0192 also results if the readonly field is static and the constructor is not marked static.
Example
The following sample generates CS0192.
// CS0192.cs
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()
{
}
}