So I am making a "Disable all checked checkboxes" button for my windows form application in c#. The code I have works fine when set to loop through a specific panel, like so:
private void LockChecked_Click(object sender, EventArgs e)
{
foreach (Control c in block1Panel.Controls)
{
if (c is CheckBox)
{
CheckBox cb = (CheckBox)c;
if (cb.Checked == true)
{
cb.Enabled = false;
}
}
}
}
But what I'd like to do is loop through all the block panels (block1Panel, block2Panel, block3Panel, etc.) that are inside a main panel (Assignments_Panel).
So, how can I iterate through all the checkboxes from all panels, without having to write a loop for each panel? I know it's possible, but since I'm only a beginner I'm not able to figure this one out, even after hours of searching...
Thank you in advance! And if anything in my question is unclear please say so, so I can explain further!
This method may help. It loops through each control from a parent control, which in your case looks as tough it'd be Assignments_Panel, then for each control that belongs to the parent control, it will either loop through all child controls again, or disable the control, if it is a checkbox.
private void DisableCheckboxes(Control parentControl)
{
foreach (Control childControl in parentControl.Controls)
{
if (childControl is Panel childPanel)
{
DisableCheckboxes(childPanel);
}
else if (childControl is CheckBox childCheckBox)
{
childCheckBox.Enabled = false;
}
}
}
Well, we can enumerate all the controls within form while checking if the control is of type CheckBox; there are many implmentations for this, say
How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?
let's write good old Bread First Search (no Linq, recursion etc.)
private void LockChecked_Click(object sender, EventArgs e) {
Queue<Control> agenda = new Queue<Control>(new [] { this });
while (agenda.Count > 0) {
Control control = agenda.Dequeue();
if (control is CheckBox cb && cb.Checked)
cb.Enabled = false;
foreach (Control child in control.Controls)
agenda.Enqueue(child);
}
}
Related
The picture below represents a plug-in I am building.
Yellow = tabControl1; Orange = tabPage1; Blue = Main Panel (mainPanel); Green = 3 different panels inside the main panel (panel1, panel2 and panel3); White = TextBoxes (that I want to clear); DarkBlue = CheckBoxes corresponsing to the green panels
I am trying to clear any text from the TextBoxes that contain text and reset CheckBoxes when checked, with a button click.
I researched online and tried to accomplish this by the following way but it doesn't seem to be the correct way to handle this problem.
foreach (Control a in tabControl1.Controls)
{
foreach(Control b in tabPage1.Controls)
{
foreach (Control c in mainPanel.Controls)
{
foreach (Control d in panel1.Controls)
{
if (d is TextBox)
{
d.Text = " ";
}
if (d is CheckBox)
{
((CheckBox)d).Checked = false;
}
}
}
}
}
I have only shown panel1 here but tried doing the same thing for panel2 and 3 as well.
What exactly am I doing wrong here? Any help would be greatly appreciated!
You just need a simple recursive method that iterates all controls inside all child containers of a specified parent container, mainPanel, here.
If a control is of type TextBox or CheckBox, set its Text or Checked property accordingly:
(Note that you can also pass tabPage1 to the method, or any other ancestor)
ClearControls(panel1);
// or
ClearControls(tabPage1);
private void ClearControls(Control parent)
{
if ((parent == null) || (!parent.HasChildren))
return;
foreach (var ctl in parent.Controls.OfType<Control>())
{
if (ctl is TextBox txt) {
txt.Clear();
}
if (ctl is CheckBox chk) {
chk.Checked = false;
}
else {
if (ctl.HasChildren) {
ClearControls(ctl);
}
}
}
}
If you want to clear the TextBoxes and ComboBoxes inside of panel1 then you only need to loop through panel1's controls to do it. To handle any panel, you could just write a ClearPanel(Panel) function.
private void ClearPanel(Panel panel)
{
foreach (var ctrl in panel.Controls)
{
if (ctrl is TextBox tb)
{
tb.Clear();
}
else if (ctrl is CheckBox chkBx)
{
chkBx.Checked = false;
}
}
}
private void ClearPanel1Button_Click(object sender, EventArgs e)
{
ClearPanel(panel1);
}
Iterating through the controls in tabControl1, tabPage1, etc, etc adds unnecessary overhead if you already have a reference to the Panel you're dealing with. What's more, if any of the controls in the outer loops have an empty Controls collection then the inner loops won't execute. I suspect this might be why your code isn't working.
Note that the above solution will not handle any TextBox or ComboBox that is inside another container inside panel1. So, if panel1 had a GroupBox inside it which contained TextBoxes or ComboBoxes, they wouldn't be cleared. See the recursive solution below to handle that situation.
EDIT: After re-reading your question I thought maybe you want to clear all TextBox and CheckBox controls on the Form.
If you're needing to clear every TextBox or CheckBox on the Form, you can do this with recursion.
private void Clear(Control ctrl)
{
if (ctrl is TextBox tb)
{
tb.Clear();
}
if (ctrl is CheckBox chkBx)
{
chkBx.Checked = false;
}
foreach (Control child in ctrl.Controls)
{
Clear(child);
}
}
private void ClearButton_Click(object sender, EventArgs e)
{
Clear(this);
}
You could pass any Control to Clear(Control), so if you only wanted to do the TextBoxes and ComboBoxes on tabPage1 you could call Clear(tabPage1). This will clear all the TextBoxes and ComboBoxes on tabPage1, even if they're in a Panel or GroupBox or some other container.
I am a novice to C#.
My application contains Main form and a few usercontrols.
I want the usercontrol named "uc_MainMenu" to be displayed in the panel named "panel2" inside the Main form when I start running the applicaiton.
uc_MainMenu obj_uc_MainMenu = new uc_MainMenu();
private void frmMain_Load(object sender, EventArgs e)
{
this.panel2.Controls.Add(obj_uc_MainMenu);
}
It works.
uc_MainMenu contains a few buttons: btnHeadmaster,btnTeacher,btnStudent,btnAttendance,btnExam and btnLogin.
Each of those buttons' click will bring the corresponding predefined usercontrols.
Here is my question.
I want to disable all the buttons except btnLogin when the form loads.
How can I do that?
I tried this way but it didn't work.
foreach (Control ctrl in panel2.Controls)
{
if (ctrl.GetType() == typeof(Button))
{
((Button)ctrl).Enabled = false;
}
}
I can change each button's enabled properties in the uc_MainMenu, but if so I will have to change them again whenever I switch the usercontrols. That's why I left their enabled property to true when I designed the usercontrols.
Try this:
foreach (Control ctrl in obj_uc_MainMenu.Controls)
{
if (ctrl.GetType() == typeof(Button) && ((Button)ctrl).Name != "btLogin")
{
((Button)ctrl).Enabled = false;
}
}
Notice that I changed panel2 by obj_uc_MainMenu.
Create a property inside user control :
public bool MyButtonEnabled
{
get
{
return anyButtonButNo_btLogin.Enabled;
}
set
{
foreach (Control ctrl in this.Controls)
{
if (ctrl.GetType() == typeof(Button) && ((Button)ctrl).Name != "btLogin")
{
((Button)ctrl).Enabled = value;
}
}
}
}
Now you can use this property anywhere that usercontrol used.
uc_MainMenu obj_uc_MainMenu = new uc_MainMenu();
private void frmMain_Load(object sender, EventArgs e)
{
this.panel2.Controls.Add(obj_uc_MainMenu);
///this property will access the button inside that user control
obj_uc_MainMenu.MyButtonEnabled=false;
}
If your buttons is inside the obj_uc_MainMenu, then you can not retrieve it via panels.Controls. If you want to retrieve them, you should use obj_uc_MainMenu.Controls.
I don't know how did you define the user control obj_uc_MainMenu, then I guest you can do something like this:
foreach (Control ctrl in obj_uc_MainMenu.Controls)
{
if (ctrl.GetType() == typeof(Button))
{
((Button)ctrl).Enabled = false;
}
}
Find will find the panel. If it exists, then iterate through the usercontrol for type button and modify the button/s properties. No need of casting for button within foreach loop (we know its of type Button).
// Get the panel
var panel2 = Controls.Find("YourPanel", true).FirstOrDefault() as Panel;
// If it exists
if (panel2 != null)
{
foreach (var button in panel2.obj_uc_MainMenu.Controls.OfType<Button>())
{
// Set the value of each one
button.Enabled = false;
}
}
Been reading through the threads a lot recently as I am learning to code!
In essence all I know is self taught and very basic, so I would like to start becoming more professional
I would like to shorten this code down (in the simplest way possible) since I often end up with very repetitive code! Here is a primary example
private void button2_Click(object sender, EventArgs e)
{
textBox1.Clear();
textBox2.Clear();
textBox3.Clear();
textBox4.Clear();
textBox5.Clear();
textBox6.Clear();
textBox7.Clear();
textBox8.Clear();
textBox9.Clear();
textBox10.Clear();
textBox11.Clear();
textBox12.Clear();
}
For context I can't clear all textboxes on my form since textBox13 always has a useful value that I can't have deleted!
EDIT * textBoxes 1 to 6 are in groupBox1, and textBoxes 7-12 are in groupBox2. This appears to be significant; I was just using the groupbox tool to make the program clear!
If anyone can help I would be truly grateful! Please keep in mind I am still a coding novice, so some features I am unfamiliar with.
Here is an image of the program to help!
Assuming all your textboxes name start in the format you displayed, you could use this:
foreach (Control control in Controls)
{
if (control.Name.StartsWith("textBox") && !control.Name.EndsWith("13") && control.GetType() == typeof(TextBox))
{
TextBox textBox = (TextBox)control;
textBox.Clear();
}
}
EDIT
If you want it to work with group boxes use this code by calling ClearTextBoxes (just write "ClearTextBoxes();")
private void ClearTextBoxes()
{
foreach (Control control in Controls)
{
ClearTextBox(control);
}
}
private void ClearTextBox(Control control)
{
if (control.GetType() == typeof(TextBox))
{
if (control.Name.StartsWith("textBox") && !control.Name.EndsWith("13"))
{
TextBox textBox = (TextBox)control;
textBox.Clear();
}
}
else if (control.GetType() == typeof(GroupBox))
{
GroupBox groupBox = (GroupBox)control;
foreach (Control groupBoxControl in groupBox.Controls)
{
ClearTextBox(groupBoxControl);
}
}
}
The current setting doesn not allow you to clear everything quickly because each variable, even if they're all of the same type and with similar name, is a different entity and you cannot iterate through them.
Anyway, you could group them in an array and iterate through them like this:
// Fill this array in an Init function
YourType[] textBoxes;
private void button2_Click(object sender, EventArgs e)
{
// Iterate through the whole array except for the last element
for(int i=0; i<textBoxes.Length-1; i++)
{
textBoxes[i].Clear();
}
}
One possible solution would be store textboxes in list
List<TextBox> textBoxes
And then iterate through this collection using for or foreach loop and calling Clear() method.
Or use extension method ForEach()
textBoxes.ForEach(x => x.Clear());
The simplest way is to prepare a collection containing all of your textbox objects
var textBoxes = new List<TextBox> { textBox1,textBox2,textBox3};// fill in the rest
and just iterate with a 'foreach' on it
textBoxes.ForEach(textBox => textBox.Clear());
This is a simple suggestion.
You can also use reflection to make it more implicit but it doesn't worth it
Usually having too many of certain control can be a sign that you can consider a different type of control, but that doesn't seem to be the case based on the screenshot. You can use array:
foreach (var t in new[] { textBox1, textBox2, textBox3 })
t.Clear();
If the controls are directly in the form then something like:
foreach (Control c in this.Controls)
if (c is TextBox && c.Name != "textBox13")
c.Text = ""; // .Text = "" is what TextBox.Clear() does
but because the controls are inside other controls:
foreach (Control c in this.groupBox1.Controls) if (c is TextBox) c.Text = "";
foreach (Control c in this.groupBox2.Controls) if (c is TextBox) c.Text = "";
or:
foreach (var gb in new[] { groupBox1, groupBox2 })
foreach (Control c in gb.Controls)
if (c is TextBox) c.Text = "";
I am coding a C# Forms application and would like to know how to enable/disable all controls container within a panel.
Here is my code:
private void EnabledPanelContents(Panel panel, bool enabled)
{
foreach (var item in panel.Controls)
{
item.enabled = enabled;
}
}
There is no enabled property in the panel.Controls collection.
How can I enable/disable all controls container within a panel.
Thanks in advance.
You are getting controls as var and iterating on them and var doesn't contain any property Enabled. You need to loop through controls and get every control as Control. Try this
private void EnabledPanelContents(Panel panel, bool enabled)
{
foreach (Control ctrl in panel.Controls)
{
ctrl.Enabled = enabled;
}
}
Enabled can be true or false.
"How can I enable/disable all controls container within a panel."
A:
If you want to disable or enable all controls within a panel, you can directly call,
Panel panel;
-> panel.Enabled = true;//For enabling all controls inside the panel.
-> panel.Enabled = false;//For disabling all controls inside the panel.
If you want only specific controls inside the panel to be enabled or disabled then you can iterate through the collection of controls and set it's enable state to true or false based on your requirement.
If you declare item as var (in the foreach loop), it won't have the properties of a windows control.
You should declare it as a control.
Try this code snippet and it should work:
foreach (Control item in panel.Controls)
{
item.Enabled = true; // = true: enable all, = false: disable all
}
Try the following code,
private void DisableAll_Click(object sender, EventArgs e)
{
EnabledPanelContents(this.panel1, false);
}
private void EnabledPanelContents(Panel panel, bool enabled)
{
foreach (Control item in panel.Controls)
{
item.Enabled= enabled;
}
}
#anshu
if your controls are HTML controls then use
foreach (Control ctrl in myControl1.Controls)
if (ctrl is HtmlControl)
((HtmlControl)ctrl).Disabled = true;
private void Form1_Load(object sender, EventArgs e)
{
foreach (Control item in panel.Controls)
if (ctrl is Button)
((Button)item).Enabled = false;
}
I need to empty all the textbox controls after the SAVE button is clicked but the user. I have around 10 of them. How do i clear text from them all simultaneously. I just know about:
textbox1.Text="";
But, if i do this, then i need to repeat this for the no. of textbox controls on my Form, that would be a labor task instead of programmer?
Please guide.
Try this
foreach(TextBox textbox in this.Controls.OfType<TextBox>())
{
textbox.Text = string.Empty;
}
If you want recursivly clear all textboxes use this function.
void ClearTextBoxes(Control control)
{
foreach(Control childControl in control.Controls)
{
TextBox textbox = childControl as TextBox;
if(textbox != null)
textbox.Text = string.Empty;
else if(childControl.Controls.Count > 0)
ClearTextBoxes(childControl);
}
}
If you have all the textboxes on a form without panels or group boxes, you can do this:
foreach (var conrol in Controls)
{
var textbox = conrol as TextBox;
if (textbox != null)
textbox.Clear();
}
If you have a panel, use panel.Controls instead.
You could use the Linq API described in the following article:
http://www.codeproject.com/KB/linq/LinqToTree.aspx#linqforms
This allows you to apply Linq-to-XML style queries on Windows Forms. The following will clear all the TextBox controls that are descendants of 'this':
foreach(TextBox textbox in this.Descendants<TextBox>()
.Cast<TextBox>())
{
textbox.Text = string.Empty;
}
If you want to clear everything on the form, I would suggest a pair of utility function such as:
public static void ClearAllControls(Control.ControlCollection controls)
{
foreach (var control in controls)
ClearAllControls(control);
}
public static void ClearAllControls(Control control)
{
var textBox = control as TextBox
if (textBox != null)
{
textBox.Text = null;
return;
}
var comboBox = control as ComboBox;
if (comboBox != null)
{
comboBox.SelectedIndex = -1;
return;
}
// ...repeat blocks for other control types as needed
ClearAllControls(control.Controls);
}
Call the first method, passing the form's Controls collection, and it will recursively drill down through panels, groups, etc, clearing all the controls it knows about. You'll have to add a block for each different control type, but at least you only have to do it once. It's a bit brute-force, but it's not the kind of code that ends up running in a loop, and it runs plenty fast, anyway.
The final line, which does the recursion, will only be reached if the current control being worked on hasn't already proven to be one of the known types, so you don't have to worry about accidentally "drilling into" things like TextBoxes, looking for child controls that won't be there.