C# Passing values to another form

Question

I'm passing a bool from one form to another, I have tried declaring 'Private bool useDBServer;' at the top of my class but this create a new variable.

What am I doing wrong?

Thanks

Form1 below:

Form2 frm = new Form2(dataGridView1, _useDBServer, _useOther);

Form2 below:

    public Form2(DataGridView dgv, bool useDBServer, bool useOther)
    {
       if(useDBServer) //<---- works here
       {
         //stuff
       }
    }


    private void readRegistry()
    {
       if(useDBServer) //<---- but not here
       {
         //stuff
       }
    }

Jon Skeet · Accepted Answer · 2009-09-25 11:10:05Z

5

If you want to use the variable in a different method, you'll have to have it as an instance variable, and copy the value in the constructor:

private readonly bool useDBServer;

public Form2(DataGridView dgv, bool useDBServer, bool useOther)
{
   this.useDBServer = useDBServer; // Copy parameter to instance variable
   if(useDBServer) 
   {
     //stuff
   }
}


private void readRegistry()
{
   if(useDBServer) // Use the instance variable
   {
     //stuff
   }
}

answered Sep 25, 2009 at 11:10

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Comments

Preet Sangha · Accepted Answer · 2009-09-25 11:10:17Z

0

public Form2(DataGridView dgv, bool _useDBServer, bool useOther)
    {
       useDBServer = _useDBServer;

       if(useDBServer) //<---- works here
       {
         //stuff
       }
    }

answered Sep 25, 2009 at 11:10

Preet Sangha

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Comments

Matt Lacey · Accepted Answer · 2009-09-25 11:10:31Z

0

Do something like this:

bool localUseDBServer;

public Form2(DataGridView dgv, bool useDBServer, bool useOther)
{
   localUseDBServer = useDBServer;

   if(localUseDBServer)
   {
     //stuff
   }
}

private void readRegistry()
{
   if(localUseDBServer)
   {
     //stuff
   }
}

answered Sep 25, 2009 at 11:10

Matt Lacey

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3 Comments

Matt Lacey Over a year ago

is the down vote just because I posted the same thing as 2 other people at the same time? Or is there something wrong in what I posted?

Jon Skeet Over a year ago

@Matt: I didn't downvote, but I wouldn't call an instance variable "localXXX"... it sounds like it's meant to be a local variable.

Matt Lacey Over a year ago

@Jon Skeet - Didn't mean to imply you down voted. Someone did & I wondered why. Yes the name is bad but I wanted to imply the variable was local to the class without putting in the code to show this.

Josh Smeaton · Accepted Answer · 2009-09-25 11:30:06Z

0

You're passing an argument to the constructor. How is that going to be used in a method within the class? You either need to 'save' the argument in an instance member variable. Or you need to forward the argument from the constructor to the method.

answered Sep 25, 2009 at 11:30

Josh Smeaton

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