I have a window form where I am creating a list of Checkboxes. The number of checkboxes created are based upon how many items are returned from the database. I've been able to create the checkboxes; however, I am not sure how to add event handlers for these checkboxes. For example, I'd like to add an OnCheckedChanged or CheckStateChanged event. How can I add these events? Also, I would appreciate any other suggestion. I am a total newbie to programming.
private void Form1_Load(object sender, EventArgs e)
{
CheckBoxes = new CheckBox[listGroup.Count()];
for (int i = 0; i < listGroup.Count(); i++)
{
CheckBoxes[i] = new CheckBox();
CheckBoxes[i].Text = listGroup.ElementAt(i).GroupName;
CheckBoxes[i].Name = "txt" + listGroup.ElementAt(i).GroupName.Replace(' ', '_');
CheckBoxes[i].CheckedChanged += new EventHandler(CheckBoxes[i]+"_CheckedChanged");
CheckBoxes[i].Width = 200;
if (i == 0)
{
CheckBoxes[i].Location = new System.Drawing.Point(5, 10);
}
else if (i == 1)
{
CheckBoxes[i].Location = new System.Drawing.Point(5, 40);
}
else if (i == 2)
{
CheckBoxes[i].Location = new System.Drawing.Point(5, 80);
}
this.Controls.Add(CheckBoxes[i]);
}
}
private void Form1_Load(object sender, EventArgs e)
{
//...
CheckBoxes[i].CheckedChanged += checkBoxes_CheckedChanged;
CheckBoxes[i].CheckStateChanged += checkBoxes_CheckStateChanged;
}
void checkBoxes_CheckedChanged(object sender, EventArgs e)
{ //do stuff when checked changed }
void checkBoxes_CheckStateChanged(object sender, EventArgs e)
{ //do stuff when check state changed }
Note: this will give identical event handling for all of your checkboxes.
If you want to do different things for different textboxes, you have to name the eventhandler differently and define that eventhandler.
A more efficient way to set the location of your checkboxes
for (int i = 0; i < listGroup.Count(); i++)
{
CheckBoxes[i] = new CheckBox();
CheckBoxes[i].Text = listGroup.ElementAt(i).GroupName;
CheckBoxes[i].Name = "txt" + listGroup.ElementAt(i).GroupName.Replace(' ', '_');
CheckBoxes[i].CheckedChanged += new EventHandler(CheckBoxes[i] + "_CheckedChanged");
CheckBoxes[i].Width = 200;
//set location based on index of i
CheckBoxes[i].Location = new System.Drawing.Point(5, 10 + (i * 30));
this.Controls.Add(CheckBoxes[i]);
}
private void LoadNewCheckboxes()
{
dynamic listGroupCount = 10;
List<System.Windows.Forms.CheckBox> CheckBoxes = new List<System.Windows.Forms.CheckBox>();
for (int i = 0; i <= listGroupCount - 1; i++)
{
System.Windows.Forms.CheckBox chkbox = new System.Windows.Forms.CheckBox();
chkbox.Text = i.ToString();
//listGroup.ElementAt(i).GroupName
chkbox.Name = "txt" + i.ToString();
//listGroup.ElementAt(i).GroupName.Replace(" "c, "_"c)
chkbox.CheckedChanged += new EventHandler(chkbox_CheckedChanged);
chkbox.CheckStateChanged += new EventHandler(chkbox_CheckStateChanged);
chkbox.Width = 200;
chkbox.AutoSize = true;
this.Controls.Add(chkbox);
CheckBoxes.Add(chkbox);
if (i == 0)
{
chkbox.Location = new System.Drawing.Point(5, 10);
}
else
{
chkbox.Location = new System.Drawing.Point(5, (CheckBoxes[i - 1].Top + CheckBoxes[i - 1].Height + 10));
}
}
}
private void chkbox_CheckedChanged(object sender, EventArgs e)
{
System.Windows.Forms.CheckBox chkbox = (System.Windows.Forms.CheckBox)sender;
if (chkbox != null)
{
//do somthing
Debug.WriteLine("chkbox_CheckedChanged");
Debug.WriteLine(chkbox.Text);
Debug.WriteLine(chkbox.Checked.ToString());
Debug.WriteLine(chkbox.Name.ToString());
}
}
private void chkbox_CheckStateChanged(object sender, EventArgs e)
{
System.Windows.Forms.CheckBox chkbox = (System.Windows.Forms.CheckBox)sender;
if (chkbox != null)
{
//do somthing
Debug.WriteLine("chkbox_CheckStateChanged");
Debug.WriteLine(chkbox.Text);
Debug.WriteLine(chkbox.Checked.ToString());
Debug.WriteLine(chkbox.Name.ToString());
}
}
Related
I have a bounded DataGridView. How can I add a button in one field with data? I will attach a screenshot of how I see it. Do you have any recommendations on this?
it's WinForms and I think that I need to write a custom column type.
I don't think the standard DataGridViewColumn subclasses provide what you're after.
It can be done, though: you will have to create your own custom Control (I guess a TextBox with a Button right next to it), and the appropriateDataGridViewColumn and DataGridViewCell subclasses to host your custom control.
Follow the documentation for further details.
Of course, the alternative would be using third-party, smarter grids.
Create custom column:
class TextAndButtonControl : UserControl
{
private TextBox textbox1;
private Button button1;
public TextAndButtonControl()
{
this.textbox1 = new TextBox();
this.Controls.Add(this.textbox1);
this.button1 = new Button();
this.Controls.Add(this.button1);
this.RenderControl();
this.button1.Click += new EventHandler(button1_Click);
}
void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("Hi");
}
public string Text
{
get { return this.textbox1.Text; }
set { this.textbox1.Text = value; }
}
public string ButtonText
{
get { return this.button1.Text; }
set { this.button1.Text = value; }
}
public void RenderControl()
{
this.textbox1.Location = new Point(0, 0);
this.textbox1.Width = 2 * this.Width / 3;
this.textbox1.Height = this.Height;
this.button1.Location = new Point(2 * this.Width / 3, 0);
this.button1.Width = this.Width / 3;
this.button1.Height = this.Height;
}
}
Add the control in the following way
private void Form1_Load(object sender, EventArgs e)
{
TextAndButtonControl bcol = new TextAndButtonControl();
bcol.Text = "Button Column ";
bcol.ButtonText = "Click Me";
bcol.Name = "btnClickMe";
bcol.RenderControl();
dgMainGrid.Controls.Add(bcol);
}
There is a DataGridViewButtonColumn-Type (Or if you just want a single Cell as Button -> DataGridViewButtonCell-Type).
You could create the DataGridButtonColumn and then add it to your DataGridView:
DataGridViewButtonColumn tempBtnColumn = new DataGridViewButtonColumn();
tempBtnColumn.HeaderText = "Button";
tempBtnColumn.Text = "Button-Text";
tempBtnColumn.Name = "Button-Name";
tempBtnColumn.UseColumnTextForButtonValue = true;
Grid.Columns.Add(tempBtnColumn);
//or if you want a specified position for the Grid:
Grid.Columns.Insert(0, tempBtnColumn);
Update
Here is an update, you could give the ButtonCell the Value you want and then read that with CurrentCell.Value (here is a example, hope it's understandable):
private void ButtonCellWithValue()
{
DataGridViewButtonCell dgvbc = new DataGridViewButtonCell();
dgvbc.Value = "1";
DataGridViewRow dgvr = new DataGridViewRow();
dgvr.Cells.Add(dgvbc);
dataGridView1.Rows.Add(dgvr);
dgvbc = new DataGridViewButtonCell();
dgvbc.Value = "2";
dataGridView1.Rows[0].Cells[1] = dgvbc;
GridView1.CellContentClick += new DataGridViewCellEventHandler(dataGridView1_CellContentClick);
}
void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (((DataGridView)sender).CurrentCell.Value == "1")
{
MessageBox.Show("Super");
}
else if (((DataGridView)sender).CurrentCell.Value == "2")
{
MessageBox.Show("Better");
}
}
Thank a lot #RavirajPalvankar.
If somebody will need, I will write the code here, because cann't write it to Ravuraj's comment, because it's long:
Use the class as Raviraj write:
class TextAndButtonControl : UserControl
{
private TextBox textbox1;
private Button button1;
public TextAndButtonControl()
{
this.textbox1 = new TextBox();
this.Controls.Add(this.textbox1);
this.button1 = new Button();
this.Controls.Add(this.button1);
this.renderControl();
this.button1.Click += new EventHandler(button1_Click);
}
void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("Click! The value is:" + this.Text);
}
public string Text
{
get { return this.textbox1.Text; }
set { this.textbox1.Text = value; }
}
public string ButtonText
{
get { return this.button1.Text; }
set { this.button1.Text = value; }
}
public void renderControl()
{
this.textbox1.Location = new Point(0, 0);
this.textbox1.Width = 2 * this.Width / 3;
this.textbox1.Height = this.Height;
this.button1.Location = new Point(2 * this.Width / 3, 0);
this.button1.Width = this.Width / 3;
this.button1.Height = this.Height;
}
}
then in main Form:
private void Form1_Load(object sender, EventArgs e)
{
DataTable dt = new DataTable();
dt.Columns.Add("col1");
dt.Columns.Add("col2");
for (int j = 0; j < 20; j++)
{
dt.Rows.Add("col1" + j.ToString(), "col2" + j.ToString());
}
this.dataGridView1.DataSource = dt;
this.dataGridView1.Columns[0].Width = 150;
this.txbtnControl = new TextAndButtonControl();
this.txbtnControl.Visible = false;
this.dataGridView1.Controls.Add(this.txbtnControl);
//Handle the cellbeginEdit event to show the usercontrol in the cell while editing
this.dataGridView1.CellBeginEdit += new DataGridViewCellCancelEventHandler(dataGridView1_CellBeginEdit);
}
TextAndButtonControl txbtnControl;
void dataGridView1_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
if (e.ColumnIndex == 0 && e.RowIndex > -1 && e.RowIndex != this.dataGridView1.NewRowIndex)
{
Rectangle rect = this.dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true);
this.txbtnControl.Location = rect.Location;
this.txbtnControl.Size = rect.Size;
this.txbtnControl.Text = this.dataGridView1.CurrentCell.Value.ToString();
this.txbtnControl.ButtonText = "...";
this.txbtnControl.renderControl();
this.txbtnControl.Visible = true;
}
}
private void button1_Click(object sender, EventArgs e)
{
PictureBox dynamicPicture1 = new PictureBox();
dynamicPicture1.Tag = i;
dynamicPicture1.Location = new Point(x, y);
dynamicPicture1.Name = "pictureBox" + i;
dynamicPicture1.Size = new System.Drawing.Size(30, 27);
dynamicPicture1.ImageLocation =
"C:\\Users\\Newfolder\\Downloads\\x`enter code here`ryrvc.jpg";
panel1.Controls.Add(dynamicPicture1);
}
Try this updated code.
private void button1_Click(object sender, EventArgs e)
{
int s = 4;
int x = 0;
int y = 0;
for (int i = 0; i < s; i++)
{
if (i == 0)
{
x = 38;
y = 60;
}
else
{
y += 50;
}
PictureBox dynamicPicture1 = new PictureBox();
dynamicPicture1.Tag = i;
dynamicPicture1.Location = new Point(x, y);
dynamicPicture1.Name = "pictureBox" + i;
dynamicPicture1.Size = new System.Drawing.Size(30, 27);
dynamicPicture1.ImageLocation = #"C:\Users\nxa00960\Downloads\abc.jpg";
panel1.Controls.Add(dynamicPicture1);
dynamicPicture1.Click += dynamicPicture1_Click;
}
}
void dynamicPicture1_Click(object sender, EventArgs e)
{
var pictureBox = sender as PictureBox;
switch (pictureBox.Name)
{
case "pictureBox0":
//do something
break;
case "pictureBox1":
//do something
break;
case "pictureBox2":
//do something
break;
case "pictureBox3":
//do something
break;
default:
break;
}
}
You should put the Method name of your event handler:
dynamicPicture1.Click += dynamicPicture1_Click; //note the name here
And define the event handler somewhere:
void dynamicPicture1_Click(object sender, EventArgs e) {
throw new NotImplementedException(); //default not implemented
}
The name of the event handler must match each other...
i'm designing a windows form application. In this app, user selects a number from a combobox, then depending on the number, some dynamic controls will be created(labels and comboboxes).
My problem is, i need to write some code on these dynamically created comboboxs' "selectedindexchanged" event. But i don't know how to create an event to dynamic combobox.
Here is my function:
FORM1.CS
public void getchildCntrl(Panel pnl,ComboBox cmbb)
{
for (int ix = pnl.Controls.Count - 1; ix >= 0; ix--)
if (pnl.Controls[ix].Name.Substring(0, 5) == "Child") pnl.Controls[ix].Dispose();
if (cmbb.SelectedIndex != 0)
{
Label[] childLabels = new Label[cmbb.SelectedIndex];
ComboBox[] txtTeamNames = new ComboBox[cmbb.SelectedIndex];
for (int i = 0; i < txtTeamNames.Length; i++)
{
//label create
var lbl = new Label();
childLabels[i] = lbl;
lbl.Name = "ChildLb" + i.ToString();
lbl.Text = (i + 1).ToString() + ". Çocuk-Yaş :";
lbl.Width = 80;
lbl.Location = new Point(cmbb.Location.X - 85, cmbb.Location.Y + 7 + ((i + 1) * 28));
lbl.Visible = true;
pnl.Controls.Add(lbl);
//combobox create
var cmb = new ComboBox();
txtTeamNames[i] = cmb;
cmb.Name = "Child" + i.ToString();
cmb.Location = new Point(cmbb.Location.X, cmbb.Location.Y + 5 + ((i + 1) * 28));
cmb.Width = 40;
cmb.DropDownStyle = ComboBoxStyle.DropDownList;
cmb.DataSource = ages.ToArray();
cmb.Visible = true;
pnl.Controls.Add(cmb);
}
}
}
You just register to the event like below...
cmb.SelectedIndexChanged += new System.EventHandler((object o, EventArgs e) =>
{
//Do something here
});
Or
cmb.SelectedIndexChanged += new System.EventHandler(cmb_SelectedValueChanged);
private void cmb_SelectedValueChanged(object sender, EventArgs e)
{
//Do something here.
}
You can hook up an event handler to the ComboBox like this:
cmd.SelectionChanged += new SelectionChangedEventHandler(GuiController_SelectionChanged);
void GuiController_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
throw new NotImplementedException();
}
Register event handler this way:
cmb.SelectedIndexChanged+=new EventHandler(cmb_SelectedIndexChanged);
Unregister this way:
cmb.SelectedIndexChanged-=new EventHandler(cmb_SelectedIndexChanged);
private void cmb_SelectedIndexChanged(object sender, System.EventArgs e)
{
//write your event code here
}
How to: Create Event Handlers at Run Time for Windows Forms
public void getchildCntrl(Panel pnl,ComboBox cmbb)
{
//// your code.....
//combobox create
var cmb = new ComboBox();
cmb.SelectedIndexChanged+=new EventHandler(cmb_SelectedIndexChanged);
// remaining code
cmb.Visible = true;
pnl.Controls.Add(cmb);
}
}
}
For specifying parameters - go through:
ComboBox.SelectedIndexChanged Event
I'm using a for-loop to add values into an array of PictureBox and binding a click event to each one. I'm looking for a way of getting the data of a PictureBox after clicking on it. Since it's an array, I was thinking of sending the value of the loop counter, which would identify which one was clicked.
My code looks like this:
PictureBox[] picboxes = new PictureBox[result];
for (int i = 0; i < results; i++)
{
picboxes[i] = new PictureBox();
picboxes[i].ImageLocation = #FormIni.RetRes((i * 5) + 5 + i);
picboxes[i].Click += new System.EventHandler(PictureBoxes_Click);
}
private void PictureBoxes_Click(object sender, EventArgs e)
{
label1.Text = "here I need the value of the picboxes[i] image location";
}
It can seem stupid, but I thought of something like:
picboxes[i].Click += new System.EventHandler(PictureBoxes_Click(i))
and
private void PictureBoxes_Click(object sender, EventArgs e, int i)
In short: when I click in a PictureBox created in a array via code, how do I get its values (inside the click event handler)?
EDIT!
Sorry for finding it only after making this question, but I've found this solution and it may apply to my case, right?
try do do this
PictureBox[] picboxes = new PictureBox[result];
for (int i = 0; i < results; i++)
{
picboxes[i] = new PictureBox();
picboxes[i].Name = (i+1).ToString();
picboxes[i].ImageLocation = #FormIni.RetRes((i * 5) + 5 + i);
picboxes[i].Click += new System.EventHandler(PictureBoxes_Click);
}
private void PictureBoxes_Click(object sender, EventArgs e)
{
PictureBox p = (PictureBox)sender;
string j = p.Name;
label1.Text = j;
}
You can use the following (anoynomous method) lambda expression
picboxes[i].Click += (sender, eventArguments) => PictureBoxes_Click(sender, eventArguments, i);
Use Tag
PictureBox[] picboxes = new PictureBox[result];
for (int i = 0; i < results; i++)
{
picboxes[i] = new PictureBox();
picboxes[i].Tag = (i+1).ToString();
picboxes[i].ImageLocation = #FormIni.RetRes((i * 5) + 5 + i);
picboxes[i].Click += new System.EventHandler(PictureBoxes_Click);
}
private void PictureBoxes_Click(object sender, EventArgs e)
{
PictureBox p = (PictureBox)sender;
string j = p.tag.tostring();
label1.Text = j;
}
If i create a control on the fly, as below
private void button10_Click(object sender, EventArgs e)
{
CheckedListBox CheckedListBox1 = new CheckedListBox();
CheckedListBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
CheckedListBox1.ItemHeight = 16;
CheckedListBox1.Location = new System.Drawing.Point(12, 313);
CheckedListBox1.Name = "CheckedListBox1";
CheckedListBox1.Size = new System.Drawing.Size(168, 244);
CheckedListBox1.TabIndex = 0;
Controls.Add(CheckedListBox1);
Button button12 = new Button();
button12.Location = new Point(900, 500);
button12.Size = new Size(75, 23);
button12.Click += new System.EventHandler(button12_Click);
button12.Name = "button12";
button12.Text = "Toggle All";
Controls.Add(button12);
}
what is the best way to reference that control from a function outside of the local scope? would it be best creating a static class to somehow hold a reference to the control that can be accessed outside the local scope or is there a findcontrol function for winforms ( i think findcontrol is just for web).
i want
private void button12_Click(object sender, EventArgs e)
{
for (int i = 0; i <= (CheckedListBox1.Items.Count - 1); i++)
{
if (CheckedListBox1.GetItemCheckState(i) == CheckState.Checked)
{
CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
}
else if (CheckedListBox1.GetItemCheckState(i) == CheckState.Indeterminate)
{
CheckedListBox1.SetItemCheckState(i, CheckState.Checked);
}
}
}
to be able to work but im going wrong because of scope? pls help a newbie
thanks
I'm assuming the two functions button12_Click and button10_Click are members of a From class. In this case, your should make your CheckListBox1 and button12 members of the From class. That way, the button12_Click will be able to reference the controls you will have created.
public partial class Form1 : Form
{
CheckedListBox CheckedListBox1 = null;
Button button12 = null;
private void button10_Click(object sender, EventArgs e)
{
CheckedListBox1 = new CheckedListBox();
CheckedListBox1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(255)), ((System.Byte)(224)), ((System.Byte)(192)));
CheckedListBox1.ItemHeight = 16;
CheckedListBox1.Location = new System.Drawing.Point(12, 313);
CheckedListBox1.Name = "CheckedListBox1";
CheckedListBox1.Size = new System.Drawing.Size(168, 244);
CheckedListBox1.TabIndex = 0;
Controls.Add(CheckedListBox1);
button12 = new Button();
button12.Location = new Point(900, 500);
button12.Size = new Size(75, 23);
button12.Click += new System.EventHandler(button12_Click);
button12.Name = "button12";
button12.Text = "Toggle All";
Controls.Add(button12);
}
private void button12_Click(object sender, EventArgs e)
{
for (int i = 0; i <= (CheckedListBox1.Items.Count - 1); i++)
{
if (CheckedListBox1.GetItemCheckState(i) == CheckState.Checked)
{
CheckedListBox1.SetItemCheckState(i, CheckState.Indeterminate);
}
else if (CheckedListBox1.GetItemCheckState(i) == CheckState.Indeterminate)
{
CheckedListBox1.SetItemCheckState(i, CheckState.Checked);
}
}
}
}
When there is only one CheckedListBox make it a class variable. But when you have always only one CheckedListBox - why do you create it dynamically?
If you're adding the controls to the page's Controls collection, just go look there. If you know the index of the control you can reference it that way. if you're adding the control to some container's Control's collection (say, a panel), look for it there