Mixing
When I have two non-static forms, how to make an event between them
I have two forms here and I want to call the function from one to the other in c# winform. I use events to do this, but they do not work. Every time I call changeTheme (), it throws me a System.NullReferenceException error: 'Object reference not set to an instance of an object.'
I tried to call her through the instance of the Main_form form, but it did not work either. I also tried the events, but when I added a function to make it so it was set to null again. But I'd like to do it with an event.
public delegate void statusChange();
public partial class Settings_form : Form
{
public event statusChange changeTheme;
//Here is some function, variables declaration and code
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
//if (changeTheme != null)
changeTheme();
}
}
public partial class Main_form : Form
{
private void Form1_Load(object sender, EventArgs e)
{
callChangeTheme();
}
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
public void chooseOtherTheme()
{
if (SettingsClass.UseDarkMode)
ToDarkMode();
else ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(28)))), ((int)(((byte)(28)))), ((int)(((byte)(28)))));
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(241)))), ((int)(((byte)(241)))), ((int)(((byte)(241)))));
}
}
c# winforms events
edited Jan 2 at 1:09
EJoshuaS
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
add a comment |
I have two forms here and I want to call the function from one to the other in c# winform. I use events to do this, but they do not work. Every time I call changeTheme (), it throws me a System.NullReferenceException error: 'Object reference not set to an instance of an object.'
I tried to call her through the instance of the Main_form form, but it did not work either. I also tried the events, but when I added a function to make it so it was set to null again. But I'd like to do it with an event.
public delegate void statusChange();
public partial class Settings_form : Form
{
public event statusChange changeTheme;
//Here is some function, variables declaration and code
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
//if (changeTheme != null)
changeTheme();
}
}
public partial class Main_form : Form
{
private void Form1_Load(object sender, EventArgs e)
{
callChangeTheme();
}
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
public void chooseOtherTheme()
{
if (SettingsClass.UseDarkMode)
ToDarkMode();
else ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(28)))), ((int)(((byte)(28)))), ((int)(((byte)(28)))));
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(241)))), ((int)(((byte)(241)))), ((int)(((byte)(241)))));
}
}
c# winforms events
edited Jan 2 at 1:09
EJoshuaS
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13
add a comment |
I have two forms here and I want to call the function from one to the other in c# winform. I use events to do this, but they do not work. Every time I call changeTheme (), it throws me a System.NullReferenceException error: 'Object reference not set to an instance of an object.'
I tried to call her through the instance of the Main_form form, but it did not work either. I also tried the events, but when I added a function to make it so it was set to null again. But I'd like to do it with an event.
public delegate void statusChange();
public partial class Settings_form : Form
{
public event statusChange changeTheme;
//Here is some function, variables declaration and code
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
//if (changeTheme != null)
changeTheme();
}
}
public partial class Main_form : Form
{
private void Form1_Load(object sender, EventArgs e)
{
callChangeTheme();
}
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
public void chooseOtherTheme()
{
if (SettingsClass.UseDarkMode)
ToDarkMode();
else ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(28)))), ((int)(((byte)(28)))), ((int)(((byte)(28)))));
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(241)))), ((int)(((byte)(241)))), ((int)(((byte)(241)))));
}
}
c# winforms events
edited Jan 2 at 1:09
EJoshuaS
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
I have two forms here and I want to call the function from one to the other in c# winform. I use events to do this, but they do not work. Every time I call changeTheme (), it throws me a System.NullReferenceException error: 'Object reference not set to an instance of an object.'
I tried to call her through the instance of the Main_form form, but it did not work either. I also tried the events, but when I added a function to make it so it was set to null again. But I'd like to do it with an event.
public delegate void statusChange();
public partial class Settings_form : Form
{
public event statusChange changeTheme;
//Here is some function, variables declaration and code
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
//if (changeTheme != null)
changeTheme();
}
}
public partial class Main_form : Form
{
private void Form1_Load(object sender, EventArgs e)
{
callChangeTheme();
}
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
public void chooseOtherTheme()
{
if (SettingsClass.UseDarkMode)
ToDarkMode();
else ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(28)))), ((int)(((byte)(28)))), ((int)(((byte)(28)))));
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(((int)(((byte)(241)))), ((int)(((byte)(241)))), ((int)(((byte)(241)))));
}
}
c# winforms events
c# winforms events
edited Jan 2 at 1:09
EJoshuaS
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
edited Jan 2 at 1:09
EJoshuaS
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
edited Jan 2 at 1:09
EJoshuaS
7,359102951
edited Jan 2 at 1:09
EJoshuaS
7,359102951
edited Jan 2 at 1:09
EJoshuaS
7,359102951
7,359102951
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
asked Jan 1 at 19:30
MineFuf LPMineFuf LP
42
42
Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13
add a comment |
Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13
Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13
Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13
add a comment |
2 Answers
2
active
oldest
votes
One big issue I notice is here:
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
You're creating a new instance of Settings_form every time you call this method, but you never actually do anything with the instance - the only time you call Show() is on a completely different instance:
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
If you want to act Settings_form from your main form, you should be sure that you're always acting on the same instance.
Also, please do be mindful of subscribing and unsubscribing events in a way that guarantees that you don't accidentally end up with a memory leak. You can see more details on this here: Why and How to avoid Event Handler memory leaks?
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
add a comment |
The null reference exception is happening because nothing is subscribed to your event.
Generally you'd create an event like this:
public event EventHandler<EventArgs> MyEvent;
It's a lot easier to read than the older event/delegate style but works in exactly the same way.
And fire it like this:
MyEvent?.Invoke(this, EventArgs.Empty);
That way it will only fire if you have subscribers. Again analogous to the if != null fire older style.
With that out of the way, there is a simpler way you can achieve what you want without events.
If you create a derived form and have the change code implemented there you can create the rest of your forms out of that then just call the change code directly:
Your new base form:
public MyDerivedForm : Form
{
public MyDerivedForm()
{
InitializeComponent();
}
public void ChangeTheme(bool usedarkmode)
{
if (usedarkmode)
ToDarkMode();
else
ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(28, 28, 28);
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(241, 241, 241);
}
}
I've simplified your FromArgb calls. All your casting was completely superfluous.
Now derive all your other forms from MyDerivedForm:
public MainForm : MyDerivedForm
{
}
Just add a new form to the project and change the : Form to : MyDerivedForm
In your Settings_form you can just loop over all your opened forms and call the ChangeTheme function on each one which will then switch between light and dark mode.
public Settings_form: MyDerivedForm
{
public Settings_form()
{
InitializeComponent();
}
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
foreach(MyDerivedForm form in Application.OpenForms.OfType<MyDerivedForm>())
{
form.ChangeTheme(SettingsClass.UseDarkMode);
}
}
}
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
One big issue I notice is here:
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
You're creating a new instance of Settings_form every time you call this method, but you never actually do anything with the instance - the only time you call Show() is on a completely different instance:
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
If you want to act Settings_form from your main form, you should be sure that you're always acting on the same instance.
Also, please do be mindful of subscribing and unsubscribing events in a way that guarantees that you don't accidentally end up with a memory leak. You can see more details on this here: Why and How to avoid Event Handler memory leaks?
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
add a comment |
One big issue I notice is here:
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
You're creating a new instance of Settings_form every time you call this method, but you never actually do anything with the instance - the only time you call Show() is on a completely different instance:
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
If you want to act Settings_form from your main form, you should be sure that you're always acting on the same instance.
Also, please do be mindful of subscribing and unsubscribing events in a way that guarantees that you don't accidentally end up with a memory leak. You can see more details on this here: Why and How to avoid Event Handler memory leaks?
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
add a comment |
One big issue I notice is here:
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
You're creating a new instance of Settings_form every time you call this method, but you never actually do anything with the instance - the only time you call Show() is on a completely different instance:
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
If you want to act Settings_form from your main form, you should be sure that you're always acting on the same instance.
Also, please do be mindful of subscribing and unsubscribing events in a way that guarantees that you don't accidentally end up with a memory leak. You can see more details on this here: Why and How to avoid Event Handler memory leaks?
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
One big issue I notice is here:
public void callChangeTheme()
{
Settings_form settings_Form = new Settings_form();
settings_Form.changeTheme += new statusChange(chooseOtherTheme);
}
You're creating a new instance of Settings_form every time you call this method, but you never actually do anything with the instance - the only time you call Show() is on a completely different instance:
private void settingsToolStripMenuItem_Click(object sender, EventArgs e)
{
Settings_form settings_Form = new Settings_form();
settings_Form.Show();
}
If you want to act Settings_form from your main form, you should be sure that you're always acting on the same instance.
Also, please do be mindful of subscribing and unsubscribing events in a way that guarantees that you don't accidentally end up with a memory leak. You can see more details on this here: Why and How to avoid Event Handler memory leaks?
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
answered Jan 2 at 1:14
EJoshuaSEJoshuaS
7,359102951
7,359102951
add a comment |
add a comment |
The null reference exception is happening because nothing is subscribed to your event.
Generally you'd create an event like this:
public event EventHandler<EventArgs> MyEvent;
It's a lot easier to read than the older event/delegate style but works in exactly the same way.
And fire it like this:
MyEvent?.Invoke(this, EventArgs.Empty);
That way it will only fire if you have subscribers. Again analogous to the if != null fire older style.
With that out of the way, there is a simpler way you can achieve what you want without events.
If you create a derived form and have the change code implemented there you can create the rest of your forms out of that then just call the change code directly:
Your new base form:
public MyDerivedForm : Form
{
public MyDerivedForm()
{
InitializeComponent();
}
public void ChangeTheme(bool usedarkmode)
{
if (usedarkmode)
ToDarkMode();
else
ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(28, 28, 28);
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(241, 241, 241);
}
}
I've simplified your FromArgb calls. All your casting was completely superfluous.
Now derive all your other forms from MyDerivedForm:
public MainForm : MyDerivedForm
{
}
Just add a new form to the project and change the : Form to : MyDerivedForm
In your Settings_form you can just loop over all your opened forms and call the ChangeTheme function on each one which will then switch between light and dark mode.
public Settings_form: MyDerivedForm
{
public Settings_form()
{
InitializeComponent();
}
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
foreach(MyDerivedForm form in Application.OpenForms.OfType<MyDerivedForm>())
{
form.ChangeTheme(SettingsClass.UseDarkMode);
}
}
}
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
add a comment |
The null reference exception is happening because nothing is subscribed to your event.
Generally you'd create an event like this:
public event EventHandler<EventArgs> MyEvent;
It's a lot easier to read than the older event/delegate style but works in exactly the same way.
And fire it like this:
MyEvent?.Invoke(this, EventArgs.Empty);
That way it will only fire if you have subscribers. Again analogous to the if != null fire older style.
With that out of the way, there is a simpler way you can achieve what you want without events.
If you create a derived form and have the change code implemented there you can create the rest of your forms out of that then just call the change code directly:
Your new base form:
public MyDerivedForm : Form
{
public MyDerivedForm()
{
InitializeComponent();
}
public void ChangeTheme(bool usedarkmode)
{
if (usedarkmode)
ToDarkMode();
else
ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(28, 28, 28);
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(241, 241, 241);
}
}
I've simplified your FromArgb calls. All your casting was completely superfluous.
Now derive all your other forms from MyDerivedForm:
public MainForm : MyDerivedForm
{
}
Just add a new form to the project and change the : Form to : MyDerivedForm
In your Settings_form you can just loop over all your opened forms and call the ChangeTheme function on each one which will then switch between light and dark mode.
public Settings_form: MyDerivedForm
{
public Settings_form()
{
InitializeComponent();
}
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
foreach(MyDerivedForm form in Application.OpenForms.OfType<MyDerivedForm>())
{
form.ChangeTheme(SettingsClass.UseDarkMode);
}
}
}
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
add a comment |
The null reference exception is happening because nothing is subscribed to your event.
Generally you'd create an event like this:
public event EventHandler<EventArgs> MyEvent;
It's a lot easier to read than the older event/delegate style but works in exactly the same way.
And fire it like this:
MyEvent?.Invoke(this, EventArgs.Empty);
That way it will only fire if you have subscribers. Again analogous to the if != null fire older style.
With that out of the way, there is a simpler way you can achieve what you want without events.
If you create a derived form and have the change code implemented there you can create the rest of your forms out of that then just call the change code directly:
Your new base form:
public MyDerivedForm : Form
{
public MyDerivedForm()
{
InitializeComponent();
}
public void ChangeTheme(bool usedarkmode)
{
if (usedarkmode)
ToDarkMode();
else
ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(28, 28, 28);
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(241, 241, 241);
}
}
I've simplified your FromArgb calls. All your casting was completely superfluous.
Now derive all your other forms from MyDerivedForm:
public MainForm : MyDerivedForm
{
}
Just add a new form to the project and change the : Form to : MyDerivedForm
In your Settings_form you can just loop over all your opened forms and call the ChangeTheme function on each one which will then switch between light and dark mode.
public Settings_form: MyDerivedForm
{
public Settings_form()
{
InitializeComponent();
}
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
foreach(MyDerivedForm form in Application.OpenForms.OfType<MyDerivedForm>())
{
form.ChangeTheme(SettingsClass.UseDarkMode);
}
}
}
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
The null reference exception is happening because nothing is subscribed to your event.
Generally you'd create an event like this:
public event EventHandler<EventArgs> MyEvent;
It's a lot easier to read than the older event/delegate style but works in exactly the same way.
And fire it like this:
MyEvent?.Invoke(this, EventArgs.Empty);
That way it will only fire if you have subscribers. Again analogous to the if != null fire older style.
With that out of the way, there is a simpler way you can achieve what you want without events.
If you create a derived form and have the change code implemented there you can create the rest of your forms out of that then just call the change code directly:
Your new base form:
public MyDerivedForm : Form
{
public MyDerivedForm()
{
InitializeComponent();
}
public void ChangeTheme(bool usedarkmode)
{
if (usedarkmode)
ToDarkMode();
else
ToLightMode();
}
public void ToDarkMode()
{
this.BackColor = Color.FromArgb(28, 28, 28);
}
public void ToLightMode()
{
this.BackColor = Color.FromArgb(241, 241, 241);
}
}
I've simplified your FromArgb calls. All your casting was completely superfluous.
Now derive all your other forms from MyDerivedForm:
public MainForm : MyDerivedForm
{
}
Just add a new form to the project and change the : Form to : MyDerivedForm
In your Settings_form you can just loop over all your opened forms and call the ChangeTheme function on each one which will then switch between light and dark mode.
public Settings_form: MyDerivedForm
{
public Settings_form()
{
InitializeComponent();
}
private void UseDarkMode_chk_CheckedChanged(object sender, EventArgs e)
{
//Some code
SettingsClass.UseDarkMode = this.UseDarkMode_chk.Checked;
foreach(MyDerivedForm form in Application.OpenForms.OfType<MyDerivedForm>())
{
form.ChangeTheme(SettingsClass.UseDarkMode);
}
}
}
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
edited Jan 2 at 8:55
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
answered Jan 1 at 21:12
Handbag CrabHandbag Crab
1,3271312
1,3271312
add a comment |
add a comment |
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Which line of code gives you the error ?
– Chetan Ranpariya
Jan 1 at 21:13