Converted JSON to classes, how to set values

Question

I have pasted JSON in to my C# console application, so it produces classes like so :

public class Rootobject
{
    public Id id { get; set; }
}

public class Id
{
    public Identifier Identifier { get; set; }
}

public class Identifier
{
    public Id1 id { get; set; }
    public Type type { get; set; }
}

public class Id1
{
    public string IdentifierString { get; set; }
}

public class Type
{
    public string IdentifierType { get; set; }
}

I wish to set the values of identifierString and identifierType like so :

var node = new Rootobject();
 node.id.Identifier.id.IdentifierString = "testId";
 node.id.Identifier.type.IdentifierType = "idType";

However, I get an 'Object reference not set to an instance of an object' error.

The `Id` class is non-static. So, you need to create an object of it. — Atanu Roy, Nov 24 '16 at 13:26
Possible duplicate of [Convert JSON String To C# Object](http://stackoverflow.com/questions/4611031/convert-json-string-to-c-sharp-object) — Liam, Nov 24 '16 at 13:27
Possible duplicate of [What does "Object reference not set to an instance of an object" mean?](http://stackoverflow.com/questions/779091/what-does-object-reference-not-set-to-an-instance-of-an-object-mean) — kiziu, Nov 24 '16 at 13:53

score 1 · Accepted Answer · edited Nov 24 '16 at 13:37

1

you should write:

 var node = new Rootobject();
 node.id = new Id();
 node.id.Identifier = new Identifier();
 node.id.Identifier.id = new Id1();
 node.id.Identifier.type = new Type();
 node.id.Identifier.id.IdentifierString = "testId";
 node.id.Identifier.type.IdentifierType = "idType";

or even better:

var node = new Rootobject
{
  id = new Id
  {
    Identifier = new Identifier
    {
      id = new Id1 { IdentifierString = "id" },
      type = new Type { IdentifierType = "type" },
    }
  }
};

You are missing creation of objects, they are nulls

edited Nov 24 '16 at 13:37

thatOneGuy

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answered Nov 24 '16 at 13:27

Maksim Simkin

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Thanks, that worked :) I edited the creation to create the correct objects :) – thatOneGuy Nov 24 '16 at 13:32

score 1 · Answer 2 · answered Nov 24 '16 at 13:30

Or version which compile :)

var node = new RootObject
{
    id = new Id
    { 
        Identifier = new Identifier
        {
            id = new Id1 { IdentifierString = "id" },
            type = new Type { IdentifierType = "type" },
        }
    }
};

Converted JSON to classes, how to set values

2 Answers2