如何在usercontrols中找到控件并将其传递给字符串构建器 [英] how to find controls in usercontrols and pass it to string builder

问题描述

我可以通过这两个代码遍历面板上的控件

 Form4 fl = new Form4（）; 
 StringBuilder sb = new StringBuilder（）; 
 foreach（控制c在panel1.Controls中）
 {
 if（c是ComboBox）
 {
 ComboBox cb =（ComboBox）c; 
 sb.Append（cb.Text）; 
 fl.comboBox1.Text = sb.ToString（）; 
 fl.Show（）; 
} 
 
} 
或者通过这个
 List< combobox> lst = new List< combobox>（）; 
 void GetComboBoxValues（）
 {
 StringBuilder sb = new StringBuilder（）; 
 foreach（lst中的ComboBox c）
 {
 sb.Append（c.Text +\\\\ n）; 
} 
 MessageBox.Show（sb.ToString（））; 
} 

但我在面板上添加了一个usercontrol，其中包含一个组合框和文本框，如何找到控件并添加到字符串构建器

解决方案

您需要将用户控件中的那些控件（ComboBox，TextBox等）公开为公共属性，以便您可以像访问其他属性一样访问这些控件。 UserControl。



例如：

 class MyUserControl：UserControl 
 {
 public TextBox MyTextBox 
 {
 get {return textBox1;} 
} 
 
 public ComboBox MyComboBox 
 {
 get { return comboBox1;} 
} 
} 
 
 //表格类
 foreach（在panel1.Controls中控制ctrl）
 {
 if（ ctrl是MyUserControl）
 {
 MyUserControl myCtrl = ctrl as MyUserControl; 
 //myCtrl.TextBox.Text 
 //myCtrl.ComboBox.Text // ????希望你明白这个，
} 
} 
< pre> ; 

i can iterate through the controls which are on panel by this two code

Form4 fl = new Form4();
           StringBuilder sb = new StringBuilder();
           foreach (Control c in panel1.Controls)
           {
               if (c is ComboBox)
               {
                   ComboBox cb = (ComboBox)c;
                   sb.Append(cb.Text);
                   fl.comboBox1.Text = sb.ToString();
                   fl.Show();
               }
               
           } 
OR by this
List<combobox> lst = new List<combobox>();
void GetComboBoxValues()
{
    StringBuilder sb = new StringBuilder();
    foreach (ComboBox c in lst)
    {
        sb.Append(c.Text + "\r\n");
    }
    MessageBox.Show(sb.ToString());
}

but i add a panel and on panel a usercontrol which contains a combobox and textbox how that can be possible to find controls and add to the string builder

解决方案

You need to expose those Controls ( ComboBox,TextBox etc) inside your user control as Public properties so that you can access these control just like the other properties of the UserControl.

eg:

class MyUserControl :UserControl
{
  public TextBox MyTextBox
  {
    get {return textBox1;}
  }
 
  public ComboBox MyComboBox
  {
    get { return comboBox1;}
  }
}

//Form Class
foreach(Control ctrl in panel1.Controls)
{ 
  if(ctrl is MyUserControl)
  { 
     MyUserControl myCtrl = ctrl as MyUserControl;
     //myCtrl.TextBox.Text
     //myCtrl.ComboBox.Text //????Hope you get this, 
  }
}
<pre>

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