Using strings from other classes C#

Question

I have a class that requests that when called a string is sent when requesting / initializing it.

class Checks
{
    public Checks(string hostname2)
    {
        // logic here when class loads

    }

    public void Testing()
    {
        MessageBox.Show(hostname2);
    }
}

How would it be possible to take the string "hostname2") in the class constructor and allow this string to be called anywhere in the "Checks" class?

E.g. I call Checks(hostname2) from the Form1 class, now when the Checks class is initialized I can then use the hostname2 string in my Checks class as well

Tudor · Accepted Answer · 2012-01-14 13:48:28Z

7

Declare a member inside the class and assign the value you passed to the member inside the constructor:

class Checks
{
    private string hostname2;

    public Checks(string hostname2)
    {
       this.hostname2 = hostname2; // assign to member
    }

    public void Testing()
    {
        MessageBox.Show(hostname2);
    }
}

If you also need to have outside access, make it a property:

class Checks
{
    public string Hostname2 { get; set; }

    public Checks(string hostname2)
    {
       this.Hostname2 = hostname2; // assign to property
    }

    public void Testing()
    {
        MessageBox.Show(Hostname2);
    }
}

Properties start with a capital letter by convention. Now you can access it like this:

Checks c = new Checks("hello");
string h = c.Hostname2; // h = "hello"

Thanks to Andy for pointing this out: if you want the property to be read-only, make the setter private:

public string Hostname2 { get; private set; }

edited Jan 14, 2012 at 13:48

answered Jan 14, 2012 at 13:42

Tudor

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2 Comments

Andy Over a year ago

You should probably also point out that if you DONT want outside classes changing the value that you can have a public getter but private or protected setter.

TrueWill Over a year ago

You can also use the readonly keyword on the private field to disallow modification except at construction time. Other classes can't access a private field anyway, but readonly prevents the same class from changing its value later. In other words, it lets you specify your intention.

Paolo Tedesco · Accepted Answer · 2012-01-14 13:43:26Z

2

You need to copy the constructor argument in a class variable:

class Checks {

    // this string, declared in the class body but outside
    // methods, is a class variable, and can be accessed by
    // any class method. 
    string _hostname2;

    public Checks(string hostname2) {
        _hostname2 = hostname2;
    }

    public void Testing() {
        MessageBox.Show(_hostname2);
    }

}

answered Jan 14, 2012 at 13:43

Paolo Tedesco

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Comments

Ehsan · Accepted Answer · 2012-01-14 13:49:49Z

2

You can expose a public property to retun the hostname2 value which is the standard for exposing your private varibles


class Checks
{
    private string _hostname;
    public Checks(string hostname2)
    {
        _hostname = hostname2;
    }
    public string Hostname 
    {
       get { return _hostname; }
    }
}

answered Jan 14, 2012 at 13:49

Ehsan

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