使用属性在两个表单之间传递数据

我在C＃中的两个窗体之间传递数据。 Form1是主窗体，其文本框将接收从form2_textbox传递给它的文本，并将其显示在其文本框（form1_textbox）中。

首先，打开form1，使用空文本框和按钮，在单击form1_button时，将打开form2。 在Form2中，我在form2_textbox中输入了一个文本，然后单击了按钮（form2_button）。单击此按钮的事件，它将文本发送到form1的文本框，并且form1将以其空的form1_textbox与从form2接收的文本聚焦。

我正在使用属性来实现此任务。 FORM2.CS

public partial class Form2：Form {//声明事件forms2公共事件EventHandler SomeTextInSomeFormChanged;

public Form2() { InitializeComponent(); } public string get_text_for_Form1 { get { return form2_textBox1.Text; } } //On the button click event of form2, the text from form2 will be send to form1: public void button1_Click(object sender, EventArgs e) { Form1 f1 = new Form1(); f1.set_text_in_Form1 = get_text_for_Form1; //if subscribers exists if(SomeTextInSomeFormChanged != null) { SomeTextInSomeFormChanged(this, null); } } } 

Form1.cs的

 public partial class Form1 : Form { public Form1() { InitializeComponent(); } public string set_text_in_Form1 { set { form1_textBox1.Text = value; } } private void form1_button1_Click(object sender, EventArgs e) { Form2 f2 = new Form2(); f2.Show(); f2.SomeTextInSomeFormChanged +=new EventHandler(f2_SomeTextInSomeFormChanged); } //in form 1 subcribe to event Form2 form2 = new Form2(); public void f2_SomeTextInSomeFormChanged(object sender, EventArgs e) { this.Focus(); } } 

Answer 1

在form2中，您需要创建事件并在form1中订阅它。 就这样。

 //declare event in form 2 public event EventHandler SomeTextInSomeFormChanged; // call event in form2 text_changed event if(SomeTextInSomeFormChanged != null) SomeTextInSomeFormChanged(this, null); //in form 1 subcribe to event var form2 = new Form2(); form2.SomeTextInSomeFormChanged += SomeHandlerInForm1WhereYouCanSetForcusInForm1 

更新：

窗体2：

 public Form2() { InitializeComponent(); } public void button1_Click(object sender, EventArgs e) { //if subscribers exists if(SomeTextInSomeFormChanged != null) { SomeTextInSomeFormChanged(form2_textBox1, null); } } 

Form1中：

 public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void form1_button1_Click(object sender, EventArgs e) { Form2 f2 = new Form2(); f2.Show(); f2.SomeTextInSomeFormChanged +=new EventHandler(f2_SomeTextInSomeFormChanged); } public void f2_SomeTextInSomeFormChanged(object sender, EventArgs e) { var textBoxFromForm2 = (TextBox)sender; form1_textBox1.Text = textBoxFromForm2.Text this.Focus(); } } 

Answer 2

下面列出的网站有很好的教程。 这个特定页面演示了如何实现这一目标：

http://www.vcskicks.com/data-between-forms.php

Answer 3

那这个呢。

 ((Form2)Application.OpenForms["Form2"]).textBox1.Text = "My Message";