I want to create 10 buttons on my form when I click on button1. No error with this code below but it doesnt work either.
private void button1_Click(object sender, EventArgs e)
{
List<Button> buttons = new List<Button>();
for (int i = 0; i < buttons.Capacity; i++)
{
this.Controls.Add(buttons[i]);
}
}
You aren't creating any buttons, you just have an empty list.
You can forget the list and just create the buttons in the loop.
private void button1_Click(object sender, EventArgs e)
{
int top = 50;
int left = 100;
for (int i = 0; i < 10; i++)
{
Button button = new Button();
button.Left = left;
button.Top = top;
this.Controls.Add(button);
top += button.Height + 2;
}
}
It doesn't work because the list is empty. Try this:
private void button1_Click(object sender, EventArgs e)
{
List<Button> buttons = new List<Button>();
for (int i = 0; i < 10; i++)
{
Button newButton = new Button();
buttons.Add(newButton);
this.Controls.Add(newButton);
}
}
You could do something like this:
Point newLoc = new Point(5,5); // Set whatever you want for initial location
for(int i=0; i < 10; ++i)
{
Button b = new Button();
b.Size = new Size(10, 50);
b.Location = newLoc;
newLoc.Offset(0, b.Height + 5);
Controls.Add(b);
}
If you want them to layout in any sort of reasonable fashion it would be better to add them to one of the layout panels (i.e. FlowLayoutPanel) or to align them yourself.
Two problems- List is empty. You need to add some buttons to the list first. Second problem: You can't add buttons to "this". "This" is not referencing what you think, I think. Change this to reference a Panel for instance.
//Assume you have on your .aspx page:
<asp:Panel ID="Panel_Controls" runat="server"></asp:Panel>
private void button1_Click(object sender, EventArgs e)
{
List<Button> buttons = new List<Button>();
for (int i = 0; i < buttons.Capacity; i++)
{
Panel_Controls.Controls.Add(buttons[i]);
}
}
this is a reference to his Formuse button array like this.it will create 3 dynamic buttons bcoz h variable has value of 3
private void button1_Click(object sender, EventArgs e)
{
int h =3;
Button[] buttonArray = new Button[8];
for (int i = 0; i <= h-1; i++)
{
buttonArray[i] = new Button();
buttonArray[i].Size = new Size(20, 43);
buttonArray[i].Name= ""+i+"";
buttonArray[i].Click += button_Click;//function
buttonArray[i].Location = new Point(40, 20 + (i * 20));
panel1.Controls.Add(buttonArray[i]);
} }
I had the same doubt and came up with the following contribution:
int height = this.Size.Height;
int width = this.Size.Width;
int widthOffset = 10;
int heightOffset = 10;
int btnWidth = 100; // Button Widht
int btnHeight = 40; // Button Height
for (int i = 0; i < 50; ++i)
{
if ((widthOffset + btnWidth) >= width)
{
widthOffset = 10;
heightOffset = heightOffset + btnHeight
var button = new Button();
button.Size = new Size(btnWidth, btnHeight);
button.Name = "" + i + "";
button.Text = "" + i + "";
//button.Click += button_Click; // Button Click Event
button.Location = new Point(widthOffset, heightOffset);
Controls.Add(button);
widthOffset = widthOffset + (btnWidth);
}
else
{
var button = new Button();
button.Size = new Size(btnWidth, btnHeight);
button.Name = "" + i + "";
button.Text = "" + i + "";
//button.Click += button_Click; // Button Click Event
button.Location = new Point(widthOffset, heightOffset);
Controls.Add(button);
widthOffset = widthOffset + (btnWidth);
}
}
Expected Behaviour:
This will generate the buttons dinamically and using the current window size, "break a line" when the button exceeds the right margin of your window.
First, you aren't actually creating 10 buttons. Second, you need to set the location of each button, or they will appear on top of each other. This will do the trick:
for (int i = 0; i < 10; ++i)
{
var button = new Button();
button.Location = new Point(button.Width * i + 4, 0);
Controls.Add(button);
}
You can't add a Button to an empty list without creating a new instance of that Button. You are missing the
Button newButton = new Button();
in your code plus get rid of the .Capacity
