窗体Form1和Form2 传值

背景:窗体Form1和Form2 Form2由Form1打开(1、模式窗体 2、非模式)
要求:Form2的TextBox值传回Form1的TextBox中
方法:
 情况一:(模式窗体)Form1 .ShowDialog()打开Form2

view plaincopy to clipboardprint?
Form1:   
 public partial class Form1 : Form   
   {   
       public Form1()   
       {   
           InitializeComponent();   
       }   
  
       private void button1_Click(object sender, EventArgs e)   
       {   
           Form2 frm = new Form2(this,textBox1.Text);//带参数构造Form2(此方法该处带俩参数构造多余)   
         
           if (frm.ShowDialog() == DialogResult.OK)   
           {   
               this.textBox1.Text += frm.ReturnText;//通过Form2的属性获得回传值   
           }   
           frm = null;   
              
       }   
          
   Form2:   
    public partial class Form2 : Form   
   {   
       private Form1 pfrm;   
       private string frm1txt;   
       public Form2(Form1 parentfrm,string frm1text)   
       {   
           InitializeComponent();   
           pfrm = parentfrm;   
           frm1txt = frm1text;   
       }   
              public string ReturnText//回传值的属性   
       {   
           get { return this.frm1txt; }   
       }   
         private void button2_Click(object sender, EventArgs e)//给属性赋值并关闭模式窗体Form2   
       {   
           frm1txt = this.textBox2.Text;   
           this.DialogResult = DialogResult.OK;//*必加 模式窗体打开后 只有DialogResult初始化后才可继续操作 否则值无法传回   
           this.Close();//模式窗体关闭.close()相当于将窗体隐藏 彻底关闭需要用.Dispose()   
       }   
  
       private void button3_Click(object sender, EventArgs e)//关闭   
       {   
           this.DialogResult = DialogResult.Cancel;//同*   
           this.Close();   
       }  
 Form1:
  public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 frm = new Form2(this,textBox1.Text);//带参数构造Form2(此方法该处带俩参数构造多余)
       
            if (frm.ShowDialog() == DialogResult.OK)
            {
                this.textBox1.Text += frm.ReturnText;//通过Form2的属性获得回传值
            }
            frm = null;
            
        }
        
    Form2:
   public partial class Form2 : Form
    {
        private Form1 pfrm;
        private string frm1txt;
        public Form2(Form1 parentfrm,string frm1text)
        {
            InitializeComponent();
            pfrm = parentfrm;
            frm1txt = frm1text;
        }
      public string ReturnText//回传值的属性
        {
            get { return this.frm1txt; }
        }
          private void button2_Click(object sender, EventArgs e)//给属性赋值并关闭模式窗体Form2
        {
            frm1txt = this.textBox2.Text;
            this.DialogResult = DialogResult.OK;//*必加 模式窗体打开后 只有DialogResult初始化后才可继续操作 否则值无法传回
            this.Close();//模式窗体关闭.close()相当于将窗体隐藏 彻底关闭需要用.Dispose()
        }

        private void button3_Click(object sender, EventArgs e)//关闭
        {
            this.DialogResult = DialogResult.Cancel;//同*
            this.Close();
        } 

  

情况二:(非模式窗体)Form1 .Show()打开Form2

view plaincopy to clipboardprint?
  Form1:   
  public partial class Form1 : Form   
  {   
      public Form1()   
      {   
          InitializeComponent();   
      }   
  
      private void button1_Click(object sender, EventArgs e)   
      {   
          Form2 frm = new Form2(this,textBox1.Text);    //带参数构造Form2(此处参数1必须,参数2多余 参数2作用为将Form1的值传递到Form2)   
          frm.Show();   
      }   
      public void ChangeText(string str)//获得Form2回传过来的值   
      {   
          this.textBox1.Text += str;   
      }   
  }   
     
  Form2:   
  public partial class Form2 : Form   
  {   
      private Form1 pfrm;   
      private string frm1txt;   
      public Form2(Form1 parentfrm,string frm1text)   
      {   
          InitializeComponent();   
          pfrm = parentfrm;   
          frm1txt = frm1text;   
      }   
}   
private void button1_Click(object sender, EventArgs e)   
  {   
      pfrm.ChangeText(this.textBox2.Text);//调用Form1的方法   
  }   
private void button4_Click(object sender, EventArgs e)   
  {   
      pfrm.textBox1.Text += "sdfsdfsd";//或直接访问Form1的控件   
             
  } 

 

你可能感兴趣的:(窗体Form1和Form2 传值)