非静态字段、方法或属性是否需要对象引用? [英] An object reference is required for the non-static field, method, or property?

问题描述

我知道这可能是一个非常新的问题，所以我深表歉意.

I know this is probably a very newbish question, so I apologize.

我正在尝试从另一个表单 MaxScore 访问 Form1 上标签的 Text 属性.

I am trying to access the Text property of a label on Form1 from another form, MaxScore.

当我单击 MaxScore 上的 Ok 按钮时，我想使用 max.ToString() 将 Form1 的 myGameCountLbl.Text 设置为 Form1 的变量 max.

When I click the Ok button on MaxScore, I want to set Form1's myGameCountLbl.Text to Form1's variable, max by using max.ToString().

这是我在 MaxScore 的 OK 按钮事件中的代码:

Here is my code in the OK button event of MaxScore:

private void okBtn_Click(object sender, EventArgs e)
{
    Form1.myGameCountLbl.Text = Form1.max.ToString();
    Form1.compGameCountLbl.Text = Form1.max.ToString();
}

但是当我去编译它时，我收到错误:

But when I go to compile it, I get the error:

非静态字段、方法或属性Towergame_2.Form1.myGameCountLbl"需要对象引用

An object reference is required for the non-static field, method, or property 'Towergame_2.Form1.myGameCountLbl'

Towergame_2.Form1.max 和 Towergame_2.Form1.compGameCountLbl 出现同样的错误.

I get the same error for Towergame_2.Form1.max and Towergame_2.Form1.compGameCountLbl.

不太确定如何解决这个问题.Max 是一个公共变量，两个标签也是公共变量.

Not quite sure how to fix this. Max is a public variable and the two labels are pubic as well.

谢谢！

这是我的构造函数中的代码(感谢 lassevk 的代码！):

This is the code in my constructor (thank you lassevk for the code!):

public Form1()
{
    //initialize vars
    myHp = 100;
    compHp = 100;
    youWon = 0;
    compWon = 0;
    money = 100;
    canCompAttack = true;
    gameOver = false;

    //show HowToPlay Dialogue
    HowToPlay howToPlay = new HowToPlay();
    howToPlay.ShowDialog();

    using (MaxScore maxScore = new MaxScore())
    {
        maxScore.MainForm = this;
        maxScore.ShowDialog();
    }

    InitializeComponent();
}

推荐答案

Form1 是班级的名称吗?

Is by any chance Form1 the name of the class?

您需要引用表单类的实例.

You need to have a reference to an instance of the form class.

由于 okBtn 不在同一个表单上，您需要为 MaxScore 表单提供对 Form1 实例的引用.

Since okBtn is not on the same form, you need to give the MaxScore form a reference to the Form1 instance.

例如，您可以将其添加到您的 MaxScore 表单中:

For instance, you can add this to your MaxScore form:

public Form1 MainForm { get; set; }

然后在您的 okBtn_Click 方法中，您将这样写:

And then in your okBtn_Click method, you'll write this:

private void okBtn_Click(object sender, EventArgs e)
{
    MainForm.myGameCountLbl.Text = MainForm.max.ToString();
    MainForm.compGameCountLbl.Text = MainForm.max.ToString();
}

然后当您从 Form1 构建 MaxScore 时(我假设这就是您正在做的):

and then when you're constructing MaxScore from Form1 (I'm assuming that's what you're doing):

using (MaxScore scoreForm = new MaxScore())
{
    scoreForm.MainForm = this;
    scoreForm.ShowDialog();
}

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