在Form2 Form1的C＃存取方法 [英] C# Access Method of Form1 on Form2

问题描述

我在我的项目2个形式。
Form1中是主要形式。在那里，我有一个按钮，打开窗体2，一个ListView和调用一个网址，并用它从URL中获取数据养活ListView控件的方法。

I have 2 Forms in my project. Form1 is the main Form. There I have a button to open Form2, a ListView and a method to call a url and feed the ListView with data it gets from the url.

窗体2有一个文本框URL和一个OK按钮。

Form2 has a textbox for the url and a button "Ok".

当我按在Form1上的按钮，它会打开Form2的，没有问题。
我如何管理它的URL传递到Form1的方法，如果我输入一个URL到窗体2的文本框，然后按OK？

When I press the button on Form1, it opens Form2, no problem. How can I manage it to pass the url to the method in Form1 if I enter a url into the textbox of Form2 and press Ok?

如果我这样做

Form1 form1 = new Form1();
form1.method();

这显然会打开Form1的新实例，执行的方法有，并填写列表框那里，但不在我原来的Form1上。

it will obviously open a new instance of Form1, execute the method there and fill the listbox there but not on my original Form1.

我发现问题的各种解决方案在线，但他们要么过于复杂或他们没有工作。

I found various solutions to the problem online but either they were too complicated or they didn't work.

我怎样才能把它，它实际上执行，我已经有，所以与值加载正确的列表框在Form1的方法？

How can I put it that it actually executes the method on the Form1 that I already have and therefore load the correct listbox with the values?

很多谢谢

推荐答案

在 Form2的定义事件，并提高它时，输入的网址：

Define event on Form2 and raise it when url entered:

public class Form2 : Form
{
   public event EventHandler UrlEntered;

   private void ButtonOK_Click(object sender, EventArgs e)
   {
       if (UrlEntered != null)
           UrlEntered(this, EventArgs.Empty);
   }

   public string Url { get { return urlTextBox.Text; } }
}

订阅Form1上该事件：

Subscribe to that event on Form1:

Form2 form2 = new Form2()
form2.UrlEntered += Form2_UrlEntered;
form2.Show();

处理此事件：

Handle this event:

private void Form2_UrlEntered(object sender, EventArgs e)
{
   Form2 form2 = (Form2)sender;
   string url = form2.Url;
   // use it
}

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您也可以定义类型的事件事件处理程序和LT; UrlEnteredEventArgs方式> 自定义事件参数，这将提供输入的URL给用户

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Also you can define event of type EventHandler<UrlEnteredEventArgs> with custom event argument, which will provide entered url to subscribers.

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