How do I set a variable of myclass type

Question

1.00/5 (1 vote)

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Hi!

I have next situation:
In ClassA I created an variable of type MyClass

C#

public class ClassA
{
    public MyClass var { get; set; }
    public class MyClass
    {
        public string user { get; set; }
        public string pass { get; set; }
    }
}

static void Main(string[] args)
{
    ClassA variable = new ClassA();
    variable.var.user = "TestUser";
    variable.var.pass = "testpass";  
}

When I try to set variable.var.user with any string value it gives me the error :

Terminal

System.NullReferenceException: 'Object reference not set to an instance of an object.'

What I have tried:

C#

public class ClassA
{
    public MyClass var { get; set; }
    public class MyClass
    {
        public string user { get; set; }
        public string pass { get; set; }
    }
}

static void Main(string[] args)
{
    ClassA variable = new ClassA();
    variable.var.user = "TestUser";
    variable.var.pass = "testpass";  
}

How the assigning should be made ?

Posted 21-Oct-22 3:23am

Gaby94

Updated 21-Oct-22 3:39am

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Richard MacCutchan · Accepted Answer · 2022-10-21T03:39:00

I am not sure why you have a second class inside ClassA. But you need to instantiate the var variable before you can reference it. So add a constructor to ClassA as follows:

C#

public class ClassA
{
    public MyClass var { get; set; }
    public class MyClass
    {
        public string user { get; set; }
        public string pass { get; set; }
    }
    public ClassA()
    {
        var = new MyClass(); // create the MyClass object
    }
}

[edit]

Well it all depends on exactly what you are trying to do. But as far as I can see you only need one class and that is MyClass, so you can get rid of ClassA.

C#

public class MyClass
{
    public string user { get; set; }
    public string pass { get; set; }
}

Then all you need in your main method is:

C#

MyClass var = new MyClass(); // create the MyClass object
var.user = "TestUser";
var.pass = "testpass";

[/edit]