通过asp.net网页上的所有控制回路 [英] Loop through all controls on asp.net webpage

问题描述

我需要遍历所有的控件，我的asp.net网页，做一些事情来控制。在一种情况下我正在做一个巨大的串出页面，并通过电子邮件发送给自己，而在另一个情况下，我节省一切的cookie。

I need to loop through all the controls in my asp.net webpage and do something to the control. In one instance I'm making a giant string out of the page and emailing it to myself, and in another case I'm saving everything to a cookie.

问题是masterpages和物品与内部控制它们的集合。我希望能够在一个页面传递给方法，那么有一个方法是通用的，足以遍历最内层的内容页面的所有控件，并与他们合作。我试着用递归这样做，但我的递归是不完整的。

The problem is masterpages and items with collections of controls inside them. I want to be able to pass in a Page to the method, then have that method be generic enough to loop through all controls in the inner-most content page and work with them. I've tried doing this with recursion, but my recursion is incomplete.

欲Page对象传递到的方法，以及在最里面的内容页面通过所有控制该方法循环。我怎样才能做到这一点？

I want to pass a Page object into a method, and have that method loop through all controls in the innermost content page. How can I achieve this?

    private static String controlToString(Control control)
{
    StringBuilder result = new StringBuilder();

    String controlID = String.Empty;

    Type type = null;

    foreach (Control c in control.Controls)
    {
        try
        {
            controlID = c.ID.ToString();

            if (c is IEditableTextControl)
            {
                result.Append(controlID + ": " + ((IEditableTextControl)c).Text);
                result.Append("<br />");
            }
            else if (c is ICheckBoxControl)
            {
                result.Append(controlID + ": " + ((ICheckBoxControl)c).Checked);
                result.Append("<br />");
            }
            else if (c is ListControl)
            {
                result.Append(controlID + ": " + ((ListControl)c).SelectedValue);
                result.Append("<br />");
            }
            else if (c.HasControls())
            {
                result.Append(controlToString(c));
            }

            //result.Append("<br />");
        }
        catch (Exception e)
        {

        }
    }

    return result.ToString();
}

如果没有的try / catch

Without Try/catch

对象引用未设置到对象的实例。

Object reference not set to an instance of an object.

在行控件ID = .....

On line controlID = .....

推荐答案

如果你从你的文档的根元素开始你的原来的方法是行不通的：像page.Controls随你便只能通过控制第一级的循环，但要记住一个控制是复合材料。所以，你需要递归实现自己的目标。

Your original method will not work if you start from the root element of your document: something like page.Controls as you will only loop through the first level of controls, but remember a control can be composite. So you need recursion to pull that off.

        public void FindTheControls(List<Control> foundSofar, Control parent) 
        {

            foreach(var c in parent.Controls) 
            {
                  if(c is IControl) //Or whatever that is you checking for 
                  {

                      foundSofar.Add(c);

                      if(c.Controls.Count > 0) 
                      {
                            this.FindTheControls(foundSofar, c);
                      }
                  }


            }  

        }

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