使用多功能對象

Question

如何在另一個功能中使用對象？

main() 
{ 
    private void button1_click { 

    MyClass object = new MyClass(); 
    object.blabla(); 

    } 

    private void button2_click { 

    // how can i use object from button1_click ?? 

    } 
} 

Answer 1

使object成爲定義函數的類的成員變量。

main() 
{ 
    private MyClass object; 

    private void button1_click { 

    object = new MyClass(); 

Answer 2

通過將對象存儲在函數的作用域之外。

main() 
{ 
    MyClass obj; 

    private void button1_click 
    { 
    obj = new MyClass(); 
    obj.blabla(); 
    } 

    private void button2_click 
    { 
    //maybe check for null etc 
    obj.dosomethingelse(); 
    } 
} 

Answer 3

基本上這是一個更基本的問題，這是可以解決的如

class program 
{ 
    void Main(string[] args) 
    { 
     private MyClass FooInstance; 
     private void button1_click() 
     { 
     // TODO be defensive: check if this.FooInstance is assigned before, to not override it! 
     this.FooInstance = new MyClass(); 
     this.FooInstance.blablabla(); 
     } 

     private void button2_click() 
     { 
     // TODO add some null check aka make sure, that button1_click() happened before and this.FooInstance is assigned 
     this.FooInstance = ....; 
     } 
    } 
} 

您也可以選擇延遲加載作爲一個選項（由安德魯·安德森提到的）