Object Reference Not Set to an Instance of An Object

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Hi there,

I have a structure that I have created in a class and I create a constructor for the Struct. Now when I create an instance of the Structure from my Main procedure, and then send this new instance to a procedure to do stuff, it comes up with the above error.

C#

public Class Someclass
{
  public Struct Clues
  {
    public Clues(int value)
    {
       Array = new byte[2];
       num = value;
    }
    public byte[] Array; 
    public int num;
  };
  
}

So now in main I create the instance of this class struct

Someclass.Clues S = new Someclass.Clues(0);

And somewhere down the Line I parse this new Instance to a procedure:
SomeProcedure(S);

where it allocates values for the member of that structure

C#

SomeProcedure(Someclass.Clues qq)
{
   qq.Array[0]=0;   //Error Pops Up Here
   qq.num=25;
}

Posted 11-Oct-11 21:02pm

codenameyash

Updated 11-Oct-11 21:03pm

member60

v2

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StM0n 12-Oct-11 3:20am

Are "Class" and "Struct" spelled correctly in your code? They should be lowercase...

codenameyash 12-Oct-11 3:22am

yeah, they are all standard, exactly how C# likes them

theanil 12-Oct-11 3:26am

no your 'c' in class and 's' in struct should be in lower case.

codenameyash 12-Oct-11 3:28am

errrrrrmmmm, maybe I should have been more clear,the program compiles.. And they are all Lower case. dunno Y i didnt write them like that here :)

StM0n 12-Oct-11 3:29am

it's ok ;)

StM0n 12-Oct-11 3:29am

After changing it ot lowercase your code run fine on my machine... do you change your variable "S" somewhere?

Is your code running smoothly, if you just the code you've posted?

codenameyash 12-Oct-11 3:32am

When you say change S, what do you mean. I just create the instance and parse it down, and the variables in the struct are changed. Do you mean that?

StM0n 12-Oct-11 3:50am

Take a look at the first solution or mine (the second one)

StM0n 12-Oct-11 4:26am

Erh... no. Do you accidently discard the variable?

4 solutions

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**theanil** · Answer 1 · 2011-10-11T21:43:00

Even i was getting the same error but by placing some procedure in some class it worked
here is the code

C#

public class Someclass
    {
        public struct Clues
        {
            public Clues(int value)
            {
                Array = new byte[2];
                num = value;
            }
            public byte[] Array;
            public int num;
        };
        public void xyz(Someclass.Clues qq)
        {
            qq.Array[0] = 0;   
            qq.num = 25;
        }
  }

    class Program
    {
        static void Main(string[] args)
        {
            Someclass.Clues S = new Someclass.Clues(0);
            Someclass x = new Someclass();
            x.xyz(S);

        }

    }

codenameyash · Answer 2 · 2011-10-11T22:53:00

Solution 4

You were right, I was changing "S" ..... Very Very Very Silly Mistake, thanks for that....

Posted 11-Oct-11 22:53pm

codenameyash

Comments

StM0n 12-Oct-11 5:05am

You're welcome ;)

Herman<T>.Instance · Answer 3 · 2011-10-11T22:28:00

Solution 3

qq = not set to new Someclass.Clues();

or make Clues static or create the object reference

C#

Someclass.Clues qq = new Someclass.Clues();
SomeProcedure(qq);


SomeProcedure(Someclass.Clues qq)
{
   qq.Array[0]=0;   //Error Pops Up Here
   qq.num=25;
}

Posted 11-Oct-11 22:28pm

Herman<T>.Instance

StM0n · Answer 4 · 2011-10-11T21:50:00

C#

using System;
using System.Collections.Generic;

public class Someclass {
    public struct Clues {
        public Clues(int value) {
            Array = new byte[2];
            num = value;
        }
        public byte[] Array;
        public int num;
    };
}

public class MyClass {

    public static void Main() {
        Someclass.Clues S = new Someclass.Clues(0);        
        doSomething(S);        
    }

    private static void doSomething(Someclass.Clues qq) {
        qq.Array[0] = 0;   
        qq.num = 25;
    }        
}

Works fine with me... could you try?