csharp System.Windows.Forms.Control.HasChildren类(方法)实例源码

// Reset all the controls to the user's default Control color. 
private void ResetAllControlsBackColor(Control control)
{
   control.BackColor = SystemColors.Control;
   control.ForeColor = SystemColors.ControlText;
   if(control.HasChildren)
   {
      // Recursively call this method for each child control.
      foreach(Control childControl in control.Controls)
      {
         ResetAllControlsBackColor(childControl);
      }
   }
}

//引入命名空间
using System;
using System.Drawing;
using System.Windows.Forms;

public class ControlParent : Form
{
  private Button btn;

  public ControlParent()
  {
    btn = new Button();
    btn.Location = new Point(50,50);
    btn.Size = new Size(100,23);
    btn.Text = "Relationships";

        //Controls.Add(btn);
    btn.Parent = this;

    MessageBox.Show("Button Parent:  " + btn.Parent.ToString() + "\n" +
      "Button HasChildren:  " + btn.HasChildren.ToString() + "\n" + 
      "TopLevelControl:  " + btn.TopLevelControl.ToString() + "\n" + 
      "Form HasChildren:  " + this.HasChildren.ToString() + "\n" + 
      "Form Controls Count:  " + this.Controls.Count.ToString(),
      "Button Relationships");
  }

  static void Main() 
  {
    Application.Run(new ControlParent());
  }
}