C# reference variable, does making one null make the other null?

问题

I have a question about how C# works.

m_MyClass = new MyClass();
Dispatcher.m_MyClass = m_MyClass;

If I set m_MyClass = null, will that automatically make Dispatcher.m_MyClass null?

回答1:

No. Assigning a different value to a variable of a reference has no effect on other references.

Only modifying fields of an instance or using properties or methods which modify those fields will have an effect:

m_MyClass = new MyClass();
Dispatcher.m_MyClass = m_MyClass;

m_MyClass.MyProp = null;
// Dispatcher.m_MyClass.MyProp == null

回答2:

No. The variable assignment is assigning a copy of the reference by value. Changing the variable after the assignment will not affect the Dispatcher.m_MyClass field/property.

来源：https://stackoverflow.com/questions/18109874/c-sharp-reference-variable-does-making-one-null-make-the-other-null