从方法外部访问 Form 变量 [英] Accessing Form variable from outside of a method

问题描述

public class Simple : Form
{
    public Simple()
    {
        Text = "Server Command Line";
        Size = new Size(800, 400);
        CenterToScreen();
        Button button = new Button();
        TextBox txt = new TextBox ();
        txt.Location = new Point (20, Size.Height - 70);
        txt.Size = new Size (600, 30);
        txt.Parent = this;
        txt.KeyDown += submit;
        button.Text = "SEND";
        button.Size = new Size (50, 20);
        button.Location = new Point(620, Size.Height-70);
        button.Parent = this;
        button.Click += new EventHandler(sSubmit);   
    }

    private void submit(object sender, KeyEventArgs e)
    {
       if (e.KeyCode == Keys.Enter ) {
            Console.WriteLine ("txt.Text");//How do I grab this?
            Submit();
        }
    }
}

我正在尝试从表单外部访问 txt.Text，而谷歌也没有提供帮助.如何访问它?

I'm trying to access txt.Text from outside the Form, and google hasn't been helpful either. How do I access it?

推荐答案

你必须在你的表单类的某处定义TextBox的一些变量txt，这其实是当您将 TextBox 从 Toolbox 拖放到表单上时，设计器会自动为您完成.此变量是 TextBox 的一个实例.它应该使用构造函数 TextBox() 进行初始化，并使用您在代码中所做的一些属性.您可以在表单类Simple 的范围内使用此变量.它具有属性 Text(类型为 string)，可以修改或获取以显示.要访问属性，只需使用以下模式:[instance Name].[Property name]

You have to define some variable txt of TextBox somewhere in your form class, this is in fact done automatically by designer for you when you drag-n-drop a TextBox from Toolbox onto your form. This variable is an instance of TextBox. It should be initialized using the constructor TextBox() and with some properties as you did in your code. You can use this variable in the scope of the form class Simple. It has property Text (of type string) which can be modified or fetched to display. To access a property, just use this pattern: [instance Name].[Property name]

public class Simple : Form
{
  public Simple()
  {
    Text = "Server Command Line";
    Size = new Size(800, 400);
    CenterToScreen();
    Button button = new Button();
    txt = new TextBox ();
    txt.Location = new Point (20, Size.Height - 70);
    txt.Size = new Size (600, 30);
    txt.Parent = this;
    txt.KeyDown += submit;
    button.Text = "SEND";
    button.Size = new Size (50, 20);
    button.Location = new Point(620, Size.Height-70);
    button.Parent = this;
    button.Click += new EventHandler(sSubmit);   
  }
  TextBox txt;
  private void submit(object sender, KeyEventArgs e)
  {
     if (e.KeyCode == Keys.Enter ) {
        Console.WriteLine (txt.Text);
        Submit();
     }
  }
}

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