Develop Reference

How to run winform with showing taskbar?

I have a C#.2017 project, Home form is none border (set in properties). It always start with maximize and startposition is windowsdefaultlocation/manual (I tried). I try many code but it still runs and hide taskbar.
I want to run the form in none border, maximize/full screen mode, the form doesn't hide the taskbar of windows 10.
Tried this links:
https://social.msdn.microsoft.com/Forums/windows/en-US/e81dc341-720e-474a-9c37-75eac3a130cb/howto-show-window-form-on-top-of-taskbar-in-every-resolution?forum=winforms
https://www.c-sharpcorner.com/UploadFile/shubham0987/display-app-in-full-screen-with-windows-taskbar/
How to display a Windows Form in full screen on top of the taskbar?
private void Form1_Load(object sender, EventArgs e)
{
this.Height = Screen.PrimaryScreen.WorkingArea.Height;
this.Width = Screen.PrimaryScreen.WorkingArea.Width;
this.Location = Screen.PrimaryScreen.WorkingArea.Location;
//Screen currentScreen = Screen.FromHandle(this.Handle);
//this.Size = new System.Drawing.Size(currentScreen.Bounds.Width, currentScreen.Bounds.Height);
}
It doesn't help me anything. If you have some solution better help me please.
Much thank to all.

Setting a Forms WindowState to Maximized when your BorderStyle is none will always lay over the taskbar. This is a typical behaviour of a "Fullscreen" application.
However you are on the right track. If you want to have a semi-fullscreen experience without laying over the taskbar you have to set the Location and Size of your Form manually.
Important here is that you not only set these values manually but also take away control from the OS itself as it will always try to position a Form by some ruleset.
private void Form1_Load(object sender, EventArgs e)
{
//Hiding the Border to simulate a fullscreen-experience
this.FormBorderStyle = FormBorderStyle.None;
//Telling the operating system that we want to set the start position manually
this.StartPosition = FormStartPosition.Manual;
//Actually setting our Width, Height, and Location
this.Height = Screen.PrimaryScreen.WorkingArea.Height;
this.Width = Screen.PrimaryScreen.WorkingArea.Width;
this.Location = Screen.PrimaryScreen.WorkingArea.Location;
}
Just a little side node: You might want to think about people with multiple screens and on which screen your application should appear (maybe let the user decide by some setting etc).

Maybe this one is quite similar to something I need:
this.MaximumSize = Screen.PrimaryScreen.WorkingArea.Size ;

When I resize my Form to full screen my controls are still on old position

Here is my code
private void button1_Click(object sender, EventArgs e)
{
this.WindowState = FormWindowState.Normal;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Bounds = Screen.PrimaryScreen.Bounds;
pictureBox1.Dock = DockStyle.Fill;
}
What code I can applied on picturebox2 so that picturebox2 also displaced according to form ...

You can use the Dock and Anchor properties of the controls to determine their behavior when the form is resized. When using docks and anchors in WinForms, you typically decide for a primary control (group) that gets the main part of the screen and another group of controls that are aligned in the remaining area. So if you set DockStyle.Fill for PictureBox1 control, you set the other PictureBox to DockStyle.Right. When the form is resized, the main area is extended. Please note however, that it sometimes depends on the order that the controls were created on how they are aligned and whether it works as expected. It might take some experimenting with putting various controls to foreground in order to reach your goal.
This link lists a lot of tutorials on how to align controls on Windows Forms, specifically on setting anchors and docking controls.
In addition, you can use various layout controls, among them a TableLayoutPanel (Thanks #HansPassant for the hint). For a walk-through see this link.

You need to set anchors to all your controls on your form( by default all your controls are "tied" to the top and left of your form) . If anchors are not enough try using dock panels and dock your control.
You can se the anchors from the visual editor. Select a control and on the properties panel you should set the anchors.

Here you have to scale the child controls as the main window is scaled.
try the Scale method by calculating of the scale factor as below:
the code:
Size st = this.Size;
int height = st.Height;
int width = st.Width;
this.WindowState = FormWindowState.Normal;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Bounds = Screen.PrimaryScreen.Bounds;
Size newSize = this.Size;
SizeF scaleFactor = new SizeF();
scaleFactor.Height = newSize.Height / height;
scaleFactor.Width = newSize.Width / width;
this.Scale(scaleFactor);

C# creating a form for given size

I want to draw a rectangle on the screen. I guess the most appropriate way is use a form without boarder.
Form frm = new Form();
frm.StartPosition = FormStartPosition.Manual;
frm.Location = new Point(GlobalPosX, GlobalPosY);
frm.Size = new Size(101, 30);
frm.BackColor = System.Drawing.Color.Yellow;
frm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
frm.Show();
The created from is not as the given size. It's size is similar to the window having boarder. The displayed window is bit larger as I given and the position is also moved little bit upper and left.
Is there another way to achieve my goal?

Use the ClientSize property instead of Size:
frm.ClientSize = new Size(101,30);

If you want to draw rectangle on the screen, you can draw it directly: http://bytes.com/topic/c-sharp/answers/263740-draw-directly-screen

Drawing C# graphics without using Windows Forms
That like talks about making a border-less window. From there, just use the Graphics object to draw whatever you'd like

Get size of window in maximized version in winforms

How can I get the size a form would have in Maximized windowstate without maximizing it ?
I am doing a snapshot of a map control. I want to maximize the window when doing the snapshot but without the user noticing. It seems that the form windows state doesn't change the form size when it is hidden :
this.Hide();
this.WindowState = FormWindowState.Maximized;
// Snapshot but this.Size didn't change
this.WindowState = FormWindowState.Normal;
this.Show();
It works fine when not hiding.
So I'm trying to set the size manually but need to know the Maximized state width and height:
// x & y ???
this.Size = new Size(x,y);

You can read the workingarea-screen size.

Try the SuspendLayout() function to suspend layout updates to your screen. By calling ResumeLayout() you can resume this.

C# - Why won't a fullscreen winform app ALWAYS cover the taskbar?

I'm using Windows Vista and C#.net 3.5, but I had my friend run the program on XP and has the same problem.
So I have a C# program that I have running in the background with an icon in the SystemTray. I have a low level keyboard hook so when I press two keys (Ctr+windows in this case) it'll pull of the application's main form. The form is set to be full screen in the combo key press even handler:
this.FormBorderStyle = FormBorderStyle.None;
this.WindowState = FormWindowState.Maximized;
So it basically works. When I hit CTR+Windows it brings up the form, no matter what program I have given focus to. But sometimes, the taskbar will still show up over the form, which I don't want. I want it to always be full screen when I hit that key combo.
I figure it has something to do with what application has focus originally. But even when I click on my main form, the taskbar sometimes stays there. So I wonder if focus really is the problem. It just seems like sometimes the taskbar is being stubborn and doesn't want to sit behind my program.
Anyone have any ideas how I can fix this?
EDIT: More details-
I'm trying to achieve the same effect that a web browser has when you put it into fullscreen mode, or when you put powerpoint into presentation mode.
In a windows form you do that by putting the border style to none and maximizing the window. But sometimes the window won't cover the taskbar for some reason. Half the time it will.
If I have the main window topmost, the others will fall behind it when I click on it, which I don't want if the taskbar is hidden.

Try this (where this is your form):
this.Bounds = Screen.PrimaryScreen.Bounds;
this.TopMost = true;
That'll set the form to fullscreen, and it'll cover the taskbar.

I've tried so many solutions, some of them works on Windows XP and all of them did NOT work on Windows 7. After all I write a simple method to do so.
private void GoFullscreen(bool fullscreen)
{
if (fullscreen)
{
this.WindowState = FormWindowState.Normal;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Bounds = Screen.PrimaryScreen.Bounds;
}
else
{
this.WindowState = FormWindowState.Maximized;
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
}
}
the order of code is important and will not work if you change the place of WindwosState and FormBorderStyle.
One of the advantages of this method is leaving the TOPMOST on false that allow other forms to come over the main form.
It absolutely solved my problem.

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.F11)
if (FormBorderStyle == FormBorderStyle.None)
{
FormBorderStyle = FormBorderStyle.Sizable;
WindowState = FormWindowState.Normal;
}
else
{
SuspendLayout();
FormBorderStyle = FormBorderStyle.None;
WindowState = FormWindowState.Maximized;
ResumeLayout();
}
}

As far as I know, the taskbar is either above or below windows based on the "Keep the taskbar on top of other windows" setting. (At least, that's the wording in XP.) I suppose you could try to see if you can detect this setting and toggle it if needed?

Try resizing the form and bringing it to the front of the z-order like so:
Rectangle screenRect = Screen.GetBounds(this);
this.Location = screenRect.Location;
this.Size = screenRect.Size;
this.BringToFront();