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out modifier out modifier MyMethod(out MyClass f1, out int f2) MyClass(); 25; 15; // Create an object of the class. // Assign to the class field. // Assign to the int param.
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static void Main() { MyClass A1 = null; int A2; MyMethod(out A1, out A2); out modifiers // Call the method.
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Figure 5-9 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. At the beginning of the method, the names of the formal parameters are 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. The names A1 and A2 are out of scope and cannot be accessed from inside MyMethod. Inside the method, the code creates an object of type MyClass and assigns it to f1. It then assigns a value to f1 s field and also assigns a value to f2. The assignment to f1 and f2 are both required, since they are output parameters. After method execution, the names of the formal parameters are out of scope, but the values of both A1, the reference type, and A2, the value type, have been changed by the activity in the method.
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Figure 5-9. Output parameters
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Parameter Arrays
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In the parameter types I ve covered so far, there must be exactly one actual parameter for each formal parameter. Parameter arrays are different in that they allow zero or more actual parameters for a particular formal parameter. Important points about parameter arrays are the following: There can be only one parameter array in a parameter list. If there is one, it must be the last parameter in the list. To declare a parameter array, you must do the following: Use the params modifier before the data type. Place a set of empty square brackets after the data type. The following method header shows the syntax for the declaration of a parameter array of type int. In this example, formal parameter inVals can represent zero or more actual int parameters. Array of ints void ListInts( params int[] inVals ) { ... Modifier Parameter name The empty set of square brackets after the type name specifies that the parameter will be an array of ints. You don t need to worry about the details of arrays here. They are covered in detail in 14. For our purposes here, though, all you need to know is the following: An array is an ordered set of data items of the same type. An array is accessed by using a numerical index. An array is a reference type, and therefore stores all its data items in the heap.
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Method Invocation
You can supply the actual parameters in two ways. The forms you can use are the following: A comma-separated list of elements of the data type. All the elements must be of the type specified in the method declaration. ListInts( 10, 20, 30 ); // Three ints
A one-dimensional array of elements of the data type. int[] intArray = {1, 2, 3}; ListInts( intArray );
// An array variable
Notice in these examples that you do not use the params modifier in the invocation. The use of the modifier in parameter arrays does not fit the pattern of the other parameter types. The other parameter types are consistent in that they either use a modifier or do not use a modifier. Value parameters take no modifier in either the declaration or the invocation. Reference and output parameters require the modifier in both places. Parameter arrays, however Require the modifier in the declaration Do not allow it in the invocation
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