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For example, the following code shows method MyMethod again, but this time the parameters are reference parameters rather than value parameters. class MyClass { public int Val = 20; }
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// Initialize field to 20.
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class Program ref modifier ref modifier { static void MyMethod(ref MyClass f1, ref int f2) { f1.Val = f1.Val + 5; // Add 5 to field of f1 param. f2 = f2 + 5; // Add 5 to second param. } static void Main() { MyClass A1 = new MyClass(); int A2 = 10; MyMethod(ref A1, ref A2); ref modifiers // Call the method.
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Figure 5-8 illustrates the following about the values of the actual and formal parameters at various stages in the execution of the method: Before the method call, variables A1 and A2, which will be used as the actual parameters, are already on the stack. By the beginning of the method, the names of the formal parameters have been set as aliases for the actual parameters. Variables A1 and f1 refer to the same memory location, and A2 and f2 refer to the same memory location. At the end of the method, both f2 and the field of the object of f1 have been incremented by 5. After method execution, the names of the formal parameters are out of scope, but both the value of A2, which is the value type, and the value of the object pointed at by A1, which is the reference type, have been changed by the activity in the method.
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Figure 5-8. Reference parameter
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Output parameters are used to pass data from inside the method back out to the calling code. They are very similar to reference parameters. Like reference parameters, output parameters have the following requirements: You must use a modifier in both the method declaration and the invocation. With output parameters, the modifier is out, rather than ref. The actual parameter must be a variable it cannot be another type of expression. For example, the following code declares a method called MyMethod, which takes a single output parameter. out modifier void MyMethod( out int val ) { ... } ... int y = 1; MyMethod ( out y ); out modifier
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// Method declaration
// Variable for the actual parameter // Method call
Like reference parameters, the formal parameters of output parameters act as aliases for the actual parameters. Both the formal parameter and the actual parameter are names for the same memory location. Clearly, any changes made to a formal parameter inside the method will be visible through the actual parameter variable after the method. Unlike reference parameters, output parameters require the following: Inside the method, an output parameter must be assigned to before it can be read from. This means that the initial values of the parameters are irrelevant, and that you don t have to assign values to the actual parameters before the method call. Every output parameter must be assigned to, before the method exits.
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Since the code inside the method must write to an output variable before it can read from it, it is impossible to send data into a method by using output parameters. In fact, if there is any execution path through the method that attempts to read the value of an output parameter before the method has assigned it a value, the compiler produces an error message. public void Add2( out int outValue ) { int var1 = outValue + 2; // Error! Can't read from an output variable } // before it has been assigned to by the method.
For example, the following code again shows method MyMethod, but this time using output parameters. class MyClass { public int Val = 20; } class Program { static void { f1 = new f1.Val = f2 = }
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