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google也没有帮助.如何访问?

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

您必须在表单类中的某个位置定义 TextBox 的一些变量 txt 当您将 TextBox 从 Toolbox 拖放到表单上时，设计师会自动为您完成此操作.此变量是 TextBox 的实例.应该使用构造函数 TextBox()对其进行初始化，并使用与代码中相同的一些属性.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 )，可以对其进行修改或获取以显示.要访问属性，只需使用以下模式: [实例名称].[属性名称]

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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