從MDI父控件

Question

訪問MDI子控件我有一個MDIParent形式，MDIChild形式和所謂form1正常形態，form1從MDIChild繼承和，形成一個具有文本框名爲textBox1的，在父窗體我有兩個按鈕，新建和保存，當我點擊新建子窗體應加載，當我點擊保存一個消息框應彈出與textbox1.text價值，問題是消息框彈出與出使用波紋管代碼textbox1文本值

IM在父窗體中加載子窗體。

public partial class MDIParent1 : Form 
{ 
    MdiClient mdi = null; 
    string fname; 

    public MDIParent1() 
    { 
     InitializeComponent(); 
     foreach (Control c in this.Controls) 
     { 
      if (c is MdiClient) 
      { 
       mdi = (MdiClient)c; 
       break; 
      } 
     } 
    } 
} 

和我使用來電使用波紋管代碼[點擊新按鈕]

private void ShowNewForm(object sender, EventArgs e) 
{ 
    load_form(new Form1()); 
} 

負載形式功能的負載形式的功能是

private void load_form(object form) 
{ 
    foreach (Form f in mdi.MdiChildren) 
    { 
     f.Close(); 

    } 
    if (form == null) 
     return; 
    ((Form)form).MdiParent = this; 
    ((Form)form).Show(); 
    ((Form)form).AutoScroll = true; 
    fname = ((Form)form).Name; 
} 

和我的形式被加載。 .in保存按鈕onClick功能，我打電話給form1功能叫做getdata()

public void getdata() 
{ 
    messageBox.show(textBox1.text); 
} 

Answer 1

public partial class MDIChild : Form 
    { 
     public virtual string GetMessage() 
     { 
      return this.Name; 
     }  
    } 

    public class Form2 : MDIChild 
    { 
     TextBox textBox1 = new TextBox(); 

     public override string GetMessage() 
     { 
      return textBox1.Text; 
     } 
    } 


    public partial class MDIParent1 : Form 
    { 
     private MdiClient mdi = null; 
     private string fname; 
     private MDIChild currentActiveChild; 

     public MDIParent1() 
     { 
      base.InitializeComponent(); 
      foreach (Control c in this.Controls) 
      { 
       if (c is MdiClient) 
       { 
        mdi = (MdiClient) c; 
        break; 
       } 
      } 
     } 

     private void ShowNewForm(object sender, EventArgs e) 
     { 
      currentActiveChild = new Form2(); 
      load_form(currentActiveChild); 
     } 

     public void getdata() 
     { 
      if (currentActiveChild != null) 
      { 
       MessageBox.Show(currentActiveChild.GetMessage()); 
      } 
     } 
    }