Design Pattern note-Null Object

Source: Internet
Author: User

This mode is intended to prevent null references from being returned, use an empty object instead of an empty reference. That is, null , in this way, the client does not need to worry about whether the returned results are null references, missing judgment or try ... catch statement overhead.

This requires an anonymous instance that represents a null value, however, no matter what method is executed for this instance, I feel that the . net This mode is complicated to implement, returns null In the Program , it is like:

If(E! = NULL & E. Method1 ())


E. method2 ();







But what if I forget to judge ??

I haven't thought of a solution yet.

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