回传动态嵌套控件的FindControl（）方法

Question

如何获得动态创建的控件（即动态控件的子控件）的特定嵌套控件？ FindControl（）方法不起作用，因为它只处理我相信的TopLevel动态控件。

Answer 1

您需要通过您的控件递归的：（C＃代码）

public static Control FindControl(Control parentControl, string fieldName) 
    { 
     if (parentControl != null && parentControl.HasControls()) 
     { 
      Control c = parentControl.FindControl(fieldName); 
      if (c != null) 
      { 
       return c; 
      } 

      // if arrived here, then not found on this level, so search deeper 

      // loop through collection 
      foreach (Control ctrl in parentControl.Controls) 
      { 
       // any child controls? 
       if (ctrl.HasControls()) 
       { 
        // try and find there 
        Control c2 = FindControl(ctrl, fieldName); 
        if (c2 != null) 
        { 
         return c2; // found it! 
        } 
       } 
      } 
     } 

     return null; // found nothing (in this branch) 
    } 

Answer 2

这是我在过去的时代所使用的扩展方法。我发现使用它作为扩展方法会使代码更具表现力，但这只是一种偏好。

/// <summary> 
/// Extension method that will recursively search the control's children for a control with the given ID. 
/// </summary> 
/// <param name="parent">The control who's children should be searched</param> 
/// <param name="controlID">The ID of the control to find</param> 
/// <returns></returns> 
public static Control FindControlRecursive(this Control parent, string controlID) 
{ 
    if (!String.IsNullOrEmpty(parent.ClientID) && parent.ClientID.Equals(controlID)) return parent; 

    System.Web.UI.Control control = null; 
    foreach (System.Web.UI.Control c in parent.Controls) 
    { 
     control = c.FindControlRecursive(controlID); 
     if (control != null) 
      break; 
    } 
    return control; 
}