Avoid repeated class instantiation, Singleton Mode

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When calling a method in a class, if the method is not of the static type, we will instantiate the Class Object multiple times and then call it. The following figure shows the singleton mode.

Write the following similar code in this class:

Public class entrantattachmentsclass {# region instance Private Static readonly object lockhelper = new object (); Private Static entrantattachmentsclass _ instance; public static entrantattachmentsclass instance {get {If (_ instance = NULL) lock (lockhelper) {_ instance = new entrantattachmentsclass ();} return _ instance ;}# endregion public int car_add (entrantattachmentsmodel) {.......}...}

In this way, we can easily make the following calls:

Entrantattachmentsclass. instance. car_add (_ Model)> 0;