Ref keyword usage, ref keyword usage

Ref keyword usage, ref keyword usage

RefThe keyword is used to pass parameters by reference (rather than value.

The effect passed by reference is that any changes made to the parameters in the called method are reflected in the call method.

For example, if the caller passes a local variable expression or an array element access expression, the called method replaces the object with the object referenced by the ref parameter, then, the caller's local variables or array elements start to reference the new object.

To useRefParameters, method definitions, and call methods must be explicitly usedRefKeyword, as shown in the following example.

PassRefParameters must be initialized before being passed.

This correspondsOutThe parameters are different. You do not need to initialize the parameters explicitly before passing them. For more information, see out.

The class member cannot haveRefAndOutDifferent signatures.

If the only difference between two types of members is that one of them hasRefParameter, while the other hasOutParameter, a compilation error occurs.