Problem with static methods

[Chris Clement]

I didn't write this code so I'm not sure what is going on with this error.
checkedListBox1 is a public object. Why does the error say that it is
expecting a 'class' in a for loop? Is it because the method is static?
Here is the error and the code:

C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1' denotes a 'field'
where a 'class' was expected
public static void MenuItem_Click(object sender, System.EventArgs e)
{
for(int i = 0; i<checkedListBox1.Items.Count;i++)//<<<<line 1130
{
checkedListBox1.SetItemChecked(i,false);
}
}

Also getting an error saying: C:\...\newPrompt.cs(172): An object reference
is required for the nonstatic field, method, or property
'APP.mainForm.MenuItem'
private void button1_Click(object sender, System.EventArgs e)
{
for(int o = mainForm.historyMenuItem.MenuItems.Count-1; o>=0;o--)
mainForm.historyMenuItem.MenuItems.RemoveAt(o);

}

Help is appreciated.

[Chris Clement]

Ok. I made the checkListBox1 static and the error went away, but now it
disappears from the form in design mode. Any ideas?

[Gary van der Merwe]

Hi

Make both the method and the field non-static?

Gary
"Chris Clement" <ch**********@onlyonnewsgroup.com> wrote in message
news:#N**************@tk2msftngp13.phx.gbl...

Ok. I made the checkListBox1 static and the error went away, but now it
disappears from the form in design mode. Any ideas?

[100]

Hi Chris,
See comments inline.

C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1' denotes a 'field'
where a 'class' was expected
public static void MenuItem_Click(object sender, System.EventArgs e)
{
for(int i = 0; i<checkedListBox1.Items.Count;i++)//<<<<line 1130
{
checkedListBox1.SetItemChecked(i,false);
}
}
this method is static so you have to have reference to the form which has
this public field *checkedListBox1*.
The error message is somehow confusing, but since it is static method you
can use (beside method arguments and local variables) only static members.
Since *checkedListBox1* is not method argument nor local variable it has to
be a static member of some type ant it has to be preceded by a type name.

Also getting an error saying: C:\...\newPrompt.cs(172): An object reference is required for the nonstatic field, method, or property
'APP.mainForm.MenuItem'
private void button1_Click(object sender, System.EventArgs e)
{
for(int o = mainForm.historyMenuItem.MenuItems.Count-1; o>=0;o--)
mainForm.historyMenuItem.MenuItems.RemoveAt(o);

}

For this error I can only guess. Is it mainForm the name of the class?

HTH
B\rgds
100

[Chris Clement]

The method is being called by another class so it needs to be static for
that class to access it with instantiation. Yes, what you are saying makes
sense and I actually fixed the error by making the checkListBox1 static, but
now the checkListBox no longer appears in design mode.
"Nelson" <ne*******@cox.net> wrote in message
news:00****************************@phx.gbl...

Since your function is declared static, it can be called
without instantiation of your form class wich contains
the checkbox. Therefore your static function has know
way of knowing a checkbox exists. Why are you using a
static function here anyway?

I hope that makes sense.

-----Original Message-----
I didn't write this code so I'm not sure what is going

on with this error.

checkedListBox1 is a public object. Why does the error

say that it is

expecting a 'class' in a for loop? Is it because the

method is static?

Here is the error and the code:

C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1'

denotes a 'field'

where a 'class' was expected
public static void MenuItem_Click(object sender,

System.EventArgs e)

{
for(int i = 0;

i<checkedListBox1.Items.Count;i++)//<<<<line 1130

{
checkedListBox1.SetItemChecked(i,false);
}
}

Also getting an error saying: C:\...\newPrompt.cs(172):

An object reference

is required for the nonstatic field, method, or property
'APP.mainForm.MenuItem'
private void button1_Click(object sender,

System.EventArgs e)

{
for(int o = mainForm.historyMenuItem.MenuItems.Count-1;

o>=0;o--)

mainForm.historyMenuItem.MenuItems.RemoveAt(o);

}

Help is appreciated.

.

[Chris Clement]

"100" <10*@100.com> wrote in message
news:%2****************@TK2MSFTNGP11.phx.gbl...

Hi Chris,
See comments inline.

C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1' denotes a 'field'
where a 'class' was expected
public static void MenuItem_Click(object sender, System.EventArgs e)
{
for(int i = 0; i<checkedListBox1.Items.Count;i++)//<<<<line 1130
{
checkedListBox1.SetItemChecked(i,false);
}
}
this method is static so you have to have reference to the form which has
this public field *checkedListBox1*.
The error message is somehow confusing, but since it is static method you
can use (beside method arguments and local variables) only static members.
Since *checkedListBox1* is not method argument nor local variable it has

to be a static member of some type ant it has to be preceded by a type name.

Also getting an error saying: C:\...\newPrompt.cs(172): An object

reference

is required for the nonstatic field, method, or property
'APP.mainForm.MenuItem'
private void button1_Click(object sender, System.EventArgs e)
{
for(int o = mainForm.historyMenuItem.MenuItems.Count-1; o>=0;o--)
mainForm.historyMenuItem.MenuItems.RemoveAt(o);

}

For this error I can only guess. Is it mainForm the name of the class?

Thanks for the help, 100. Yes, mainForm is the name of the class where the
static method is. Fixed the problem by making checkListBox1 static but now
it does not appear in the design mode.

[Chris Clement]

Gary,

Thanks for the response. The newPrompt class needs to be able to access the
method so it must be static.

Chris
"Gary van der Merwe" <ga*****@hotmail.com> wrote in message
news:%2***************@TK2MSFTNGP11.phx.gbl...

Hi

Make both the method and the field non-static?

Gary
"Chris Clement" <ch**********@onlyonnewsgroup.com> wrote in message
news:#N**************@tk2msftngp13.phx.gbl...

Ok. I made the checkListBox1 static and the error went away, but now it
disappears from the form in design mode. Any ideas?

[nelson]

Chris,

Why don't you just pass the checklistbox to the function.

Example:
public static void mystaticfunction(CheckedListBox clb)
{
for(int i = 0; i<clb.Items.Count;i++)
{
clb.SetItemChecked(i,false);
}
}

This should solve your problem.

-----Original Message-----
The method is being called by another class so it needs to be static forthat class to access it with instantiation. Yes, what you are saying makessense and I actually fixed the error by making the checkListBox1 static, butnow the checkListBox no longer appears in design mode.
"Nelson" <ne*******@cox.net> wrote in message
news:00****************************@phx.gbl...

Since your function is declared static, it can be called without instantiation of your form class wich contains
the checkbox. Therefore your static function has know
way of knowing a checkbox exists. Why are you using a
static function here anyway?

I hope that makes sense.

>-----Original Message-----
>I didn't write this code so I'm not sure what is going

on with this error.

>checkedListBox1 is a public object. Why does the error

say that it is

>expecting a 'class' in a for loop? Is it because the

method is static?

>Here is the error and the code:
>
>C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1'

denotes a 'field'

>where a 'class' was expected
>
>
>public static void MenuItem_Click(object sender,

System.EventArgs e)

>{
>for(int i = 0;

i<checkedListBox1.Items.Count;i++)//<<<<line 1130

>{
>checkedListBox1.SetItemChecked(i,false);
>}
>}
>
>Also getting an error saying: C:\...\newPrompt.cs

(172): An object reference

>is required for the nonstatic field, method, or

property >'APP.mainForm.MenuItem'
>
>
>private void button1_Click(object sender,

System.EventArgs e)

>{
>for(int o = mainForm.historyMenuItem.MenuItems.Count-

1; o>=0;o--)

> mainForm.historyMenuItem.MenuItems.RemoveAt(o);
>
>}
>
>Help is appreciated.
>
>
>
>.
>

.

[Chris Clement]

Thanks, Nelson. I'll give it a try.

"nelson" <ne*******@cox.net> wrote in message
news:00****************************@phx.gbl...

Chris,

Why don't you just pass the checklistbox to the function.

Example:
public static void mystaticfunction(CheckedListBox clb)
{
for(int i = 0; i<clb.Items.Count;i++)
{
clb.SetItemChecked(i,false);
}
}

This should solve your problem.

-----Original Message-----
The method is being called by another class so it needs

to be static for

that class to access it with instantiation. Yes, what

you are saying makes

sense and I actually fixed the error by making the

checkListBox1 static, but

now the checkListBox no longer appears in design mode.
"Nelson" <ne*******@cox.net> wrote in message
news:00****************************@phx.gbl...

Since your function is declared static, it can be called without instantiation of your form class wich contains
the checkbox. Therefore your static function has know
way of knowing a checkbox exists. Why are you using a
static function here anyway?

I hope that makes sense.

>-----Original Message-----
>I didn't write this code so I'm not sure what is going
on with this error.
>checkedListBox1 is a public object. Why does the error say that it is
>expecting a 'class' in a for loop? Is it because the
method is static?
>Here is the error and the code:
>
>C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1'
denotes a 'field'
>where a 'class' was expected
>
>
>public static void MenuItem_Click(object sender,
System.EventArgs e)
>{
>for(int i = 0;
i<checkedListBox1.Items.Count;i++)//<<<<line 1130
>{
>checkedListBox1.SetItemChecked(i,false);
>}
>}
>
>Also getting an error saying: C:\...\newPrompt.cs (172): An object reference
>is required for the nonstatic field, method, or property >'APP.mainForm.MenuItem'
>
>
>private void button1_Click(object sender,
System.EventArgs e)
>{
>for(int o = mainForm.historyMenuItem.MenuItems.Count- 1; o>=0;o--)
> mainForm.historyMenuItem.MenuItems.RemoveAt(o);
>
>}
>
>Help is appreciated.
>
>
>
>.
>

.

[Frank Oquendo]

Chris,

I've read all the responses in this thread and remain unclear on the
need for a static method. Yes, you need to access this method from
another class but marking it public takes care of that problem.

It seems you're misundertanding the purpose of a static function. The
compiler expects to find the CheckedListBox within a containing type,
i.e. your form. However, since the method is static, there is no
instance of the form for it to access so it cannot locate the
CheckedListBox.

You either have to pass the object into the static method or make the
object a static member of your form. The second option makes little
sense since the only time you need something like a ListBox is as part
of a UI so that leaves you with the first option.

Personally, I'd recommend making the method non-static. Perhaps if you
gave us some more context, we could provide you with a better answer.

--
There are 10 kinds of people. Those who understand binary and those who
don't.

http://code.acadx.com
(Pull the pin to reply)

[Nelson]

Since your function is declared static, it can be called
without instantiation of your form class wich contains
the checkbox. Therefore your static function has know
way of knowing a checkbox exists. Why are you using a
static function here anyway?

I hope that makes sense.

-----Original Message-----
I didn't write this code so I'm not sure what is going on with this error.checkedListBox1 is a public object. Why does the error say that it isexpecting a 'class' in a for loop? Is it because the method is static?Here is the error and the code:

C:\...\Form1.cs(1130): 'APP.mainForm.checkedListBox1' denotes a 'field'where a 'class' was expected
public static void MenuItem_Click(object sender, System.EventArgs e){
for(int i = 0; i<checkedListBox1.Items.Count;i++)//<<<<line 1130{
checkedListBox1.SetItemChecked(i,false);
}
}

Also getting an error saying: C:\...\newPrompt.cs(172): An object referenceis required for the nonstatic field, method, or property
'APP.mainForm.MenuItem'
private void button1_Click(object sender, System.EventArgs e){
for(int o = mainForm.historyMenuItem.MenuItems.Count-1; o>=0;o--) mainForm.historyMenuItem.MenuItems.RemoveAt(o);

}

Help is appreciated.

.