如何从Form2调用Form1的方法 [英] How do I call method of Form1 from Form2

问题描述

所以我有一个名为Form1（主要名称）的表单和另一个名为Form2的表单。在Form1中，我有一个与Form1中的textBox控件交互的方法。我想在Form2中调用此方法。







--------- -------------------------------------------------- ----------------------------------------------

 命名空间 WindowsFormsApplication 
 {
  public   partial   class  Form1：Form 
 {
  internal   static  Form2 form2 =  new  Form2（）; 
 
  public  Form1（）
 {
 InitializeComponent（）; 
} 
 
  private   void  buttonShowForm2_Click（ object  sender，EventArgs e）
 {
 form2.Show（）; 
} 
 
  public   void  ShowText（） //  我要调用的方法 
 {
 textBoxInForm1.Text =  从另一个表单调用的方法; 
} 
} 
} 

------------ -------------------------------------------------- -------------------------------------------

 命名空间 WindowsFormsApplication 
 {
  public   partial   class  Form2：表格
 {
 < span class =code-keyword> public  Form2（）
 {
 InitializeComponent（）; 
} 
 
  private   void  buttonCallMethod_Click（ object <> span  sender，EventArgs e）
 {
 Form1 form1 =  new  Form1（）;  //  这会创建新的实例，这是错误的 
 form1.ShowText（）;  //   Form1中定义的方法 
 此。关闭（）; 
} 
} 
} 

-------------------- -------------------------------------------------- -----------------------------------

解决方案

< blockquote>你可能会做类似

  public   partial   class  Form2：表格
 {
 Form1 form1; 
  public  Form2（Form1 form1）
 {
  this  .form1 = form1; 
  //   ...  
} 
  private   void  buttonCallMethod_Click（ object  sender，EventArgs e）
 {
 form1.ShowText（）;  //   Form1中定义的方法 
  //   ...  
} 
  //   ...  
 

I必须使用当前表单在Form1类中定义一个：



-------------------- -------------------------------------------------- -----------------------------------

 命名空间 WindowsFormsApplication 
 {
  public   partia l   class  Form1：表格
 {
 内部 静态 Form2 form2; 
 内部 静态 Form1 form1; 
 
  public  Form1（）
 {
 InitializeComponent（）; 
 form1 = 此;  //  参考当前Form1  
} 
 
 私有  void  buttonShowForm2_Click（ object  sender，EventArgs e）
 {
 form2 =  new  Form2（ ）; 
 form2.Show（）; 
} 
 
  public   void  ShowText（） //  我要调用的方法 
 {
 textBoxInForm1.Text =  从另一个表单调用的方法; 
} 
} 
} 

------------ -------------------------------------------------- -------------------------------------------

 命名空间 WindowsFormsApplication 
 {
  public  < span class =code-keyword> partial   class  Form2：表单
 {
  public  Form2（）
 {
 InitializeComponent（）; 
} 
 
  private   void  buttonCallMethod_Click（ object  sender，EventArgs e）
 {
 Form1.form1.ShowText（）;  //   Form1中定义的方法 
  this  .Close（）; 
} 
} 
} 

------------ -------------------------------------------------- -------------------------------------------

我强烈建议阅读谢尔盖的过去的答案 [ ^ ]和他的优秀提示：一次回答的许多问题 - Windows窗体或WPF Windows之间的协作 [ ^ ]

So I have one form, named Form1 (main one) and another one, named Form2. In Form1 I have a method which interact with a textBox control in Form1. I want to call this method in Form2.



---------------------------------------------------------------------------------------------------------

namespace WindowsFormsApplication
{
    public partial class Form1 : Form
    {
        internal static Form2 form2 = new Form2();

        public Form1()
        {
            InitializeComponent();
        }

        private void buttonShowForm2_Click(object sender, EventArgs e)
        {
            form2.Show();
        }

        public void ShowText()//the method which I want to call
        {
            textBoxInForm1.Text = "Method Called From Another Form";
        }
    }
}

---------------------------------------------------------------------------------------------------------

namespace WindowsFormsApplication
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void buttonCallMethod_Click(object sender, EventArgs e)
        {
            Form1 form1 = new Form1();//this creates new instance, which is wrong
            form1.ShowText();//the method defined in Form1
            this.Close();
        }
    }
}

---------------------------------------------------------------------------------------------------------

解决方案

You might do something like

public partial class Form2 : Form
{
  Form1 form1;
  public Form2(Form1 form1)
  {
      this.form1 = form1;
      //...
  }
  private void buttonCallMethod_Click(object sender, EventArgs e)
  {
      form1.ShowText();//the method defined in Form1
      //...
  }
  //...

I had to use the current form with defining one in the Form1 class:

---------------------------------------------------------------------------------------------------------

namespace WindowsFormsApplication
{
    public partial class Form1 : Form
    {
        internal static Form2 form2;
        internal static Form1 form1;

        public Form1()
        {
            InitializeComponent();
            form1 = this;//refering to the current Form1
        }

        private void buttonShowForm2_Click(object sender, EventArgs e)
        {
            form2 = new Form2();
            form2.Show();
        }

        public void ShowText()//the method which I want to call
        {
            textBoxInForm1.Text = "Method Called From Another Form";
        }
    }
}

---------------------------------------------------------------------------------------------------------

namespace WindowsFormsApplication
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void buttonCallMethod_Click(object sender, EventArgs e)
        {
            Form1.form1.ShowText();//the method defined in Form1
            this.Close();
        }
    }
}

---------------------------------------------------------------------------------------------------------

I do strongly recommend to read Sergey's past answers[^] and His excellent tip: Many Questions Answered at Once — Collaboration between Windows Forms or WPF Windows[^]

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