使用母版页清除ASP.NET页面中的所有控件

Question

I have a asp.net page which is inherited from a master page .I want to clear all controls in this page .I tried using the bellow method .This is not working if a master page is there. Otherwise its working fine any ideas?

private void ClearControls()
{
    foreach(Control c in Page.Controls)
    {
        foreach (Control ctrl in c.Controls)
        {
            if (ctrl is TextBox)
            {
                ((TextBox)ctrl).Text = string.Empty;
            }
        }
    }
} 

Answer 1

try this:

public void FindAllTextBox(Control ctrl)
{
    if (ctrl != null)
    {
        foreach (Control c in ctrl.Controls)
        {
            if (c is TextBox)
                ((TextBox)c).Text = string.empty;
            FindAllTextBox(c);
        }
    }
}

Ex.:

Control ctrl = this.FindControl("content");
FindAllTextBox(ctrl);

Answer 2

You should be able to do this with Page.Form.FindControl("ContentPlaceHolder1").Controls :

foreach (Control item in Page.Form.FindControl("ContentPlaceHolder1").Controls)
{
    if (item is TextBox)
    {
        ((TextBox)item).Text = string.Empty;
    }
}

Answer 3

This is probably because of your controls are inside of another container when you add a master page. Have you tried adding another foreach before if?

private void ClearControls()
{ 
    foreach(Control container in Page.Controls) 
    {  
        foreach (Control c in container.Controls)  
        {     
            foreach (Control ctrl in c.Controls)  
            {     
                if (ctrl is TextBox)        
                {          
                    ((TextBox)ctrl).Text = string.Empty; 
                }   
            }  
        }
    }
}  

I wouldn't do it this way though. Sometimes hardcoding is better. This would use a lot of resource when called on a page that contains lots of controls.

Answer 4

Don't hard code:

//Recursively get all the formControls underneath the current one, be it Page, UserControl or whatever.
public static IEnumerable<Control> GetAllControls(this Control parent)  
{  
    foreach (Control control in parent.Controls)  
    {
        yield return control;  
        foreach (Control descendant in control.GetAllControls())  
        {  
            yield return descendant;  
        }  
    }  
}

Then you can call it in your webform / control:

var formCtls = this.GetAllControls().OfType<TextBox>();
foreach(TextBox txtbx in formCtls)
{
    //do what you gotta do ;)

}

Answer 5

Make a method on your .cs like this:

 //Where "this" is Page.
 ClearInput(this);

 private void ClearInput(Control parent)
 {
     foreach (Control c in parent.Controls)
     {
          if (c.Controls.Count > 0)
                ClearInput(c);
          else
          {
               if (c is TextBox)
                  (c as TextBox).Text = "";

               if (c is CheckBox)
                  (c as CheckBox).Checked = false;

                if (c is DropDownList)
                   (c as DropDownList).SelectedIndex = 1;
           }
       }
   }

Answer 6

        private void EnableControls(Control control)
        {
            var textbox = control as TextBox;
            if (textbox != null)
            {
                textbox.Enabled = true;
            }

            var dropDownList = control as DropDownList;
            if (dropDownList != null)
            {
                dropDownList.Enabled = true;
            }

            var radioButton = control as RadioButton;
            if (radioButton != null)
            {
                radioButton.Enabled = true;
            }

            var checkBox = control as CheckBox;
            if (checkBox != null)
            {
                checkBox.Enabled = true;
            }

            foreach (Control childControl in control.Controls)
            {
                EnableControls(childControl);
            }

        }

Answer 7

    public void getAllCtl(ControlCollection ctls)
    {

        foreach (Control c in ctls)
        {
            if (c is System.Web.UI.WebControls.TextBox)
            {
                //TextBox tt = c as TextBox;
                ////to do something by using textBox tt.
                ((TextBox)c).Text = string.Empty;
            }
            if (c is System.Web.UI.WebControls.CheckBox)
            {
                ((CheckBox)c).Checked = false;
            }
            if (c is System.Web.UI.WebControls.DropDownList)
            {
                ((DropDownList)c).SelectedIndex = -1;
            }
            if (c.HasControls())
            {
                getAllCtl(c.Controls);

            }
        }

    }

calling in aspx.cs file as

        getAllCtl(this.Form.Controls);

This is OK and tested work for all Master-child page and where ever multiple controls are contains in the page...

Answer 8

First, use operator as instead of is and cast :

TextBox tb = ctrl as TextBox;
if (tb != null)
{
    tb.Text = String.Empty;
}

Second, you can use ITextControl instead of TextBox .

And third, try next extension method:

public static IEnumerable<T> GetChildControls(this Control control) where T : Control
{
    var children = (control.Controls != null) ? control.Controls.OfType<T>() : Enumerable.Empty<T>();
    return children.SelectMany(c => GetChildControls(c)).Concat(children);
}

Usage:

foreach (var c in this.Page.Controls.GetChildControls<TextBox>())
{
    c.Text = String.Empty;
}

Answer 9

I had the same problem but I think I was making it too hard. I'm using an AJAX UpdatePanel control and I just referenced that instead of going all the way up to the MasterPage. This worked for me.

        foreach (Control c in UpdatePanel1.Controls)
        {
            foreach (Control c1 in c.Controls)
            {
                if (c1 is TextBox)
                {
                    TextBox txtBox = (TextBox)c1;
                    txtBox.Text = "0";
                }
            }
        }

Answer 10

Just keep the controls in Panel, and try the code below

foreach (Control cntrl in pnl.Controls)//pnl is panel id  
                {  
                    if (cntrl is TextBox)  
                    {  
                        TextBox txtBox = (TextBox)cntrl;  
                        txtBox.Text = " ";  
                    }  
                }