当我已经定义了变量时，为什么会收到错误消息，指出我的变量不存在? [英] Why am I getting an error indicating that my variable doesn't exist, when I've already defined it?

问题描述

我收到一个错误，指出 MyRandomArray 在当前上下文中不存在.如何在 C# WinForms 应用程序中跨类访问变量?

I get an error indicating that MyRandomArray doesn't exist in the current context. How do you access variables across classes in a C# WinForms application?

public void Quiz_Load(object sender, EventArgs e)
{
    string[] MyRandomArray = getWordList();
}

private void timer1_Tick(object sender, EventArgs e)
{
    somefunction(MyRandomArray);/// MyRandomArray doesn't exist in the current context.
}

推荐答案

您已经定义了数组，但是仅在 Quiz_Load 方法的范围内，因此timer1_Tick 的范围不知道它.如果将其声明为类的实例成员，则可以从任何实例方法访问它:

You've defined the array, but only in the scope of the Quiz_Load method, so the scope of timer1_Tick has no knowledge of it. If you declare it as an instance member of the class, it will be accessible from any instance method:

private string[] MyRandomArray;

public void Quiz_Load(object sender, EventArgs e)
{
    this.MyRandomArray = getWordList();
}

private void timer1_Tick(object sender, EventArgs e)
{
   somefunction(this.MyRandomArray); // No problem
}

进一步阅读

• 作用域 (C#)

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