How to add an Array of Object in a C# List<T>

Question

I have to create something like the below, a JSON string:

{
     "sync": {
          "email": "[email protected]",
          "first": "James",
          "last": "Dawson",
          "cell": "2120980989",
          "valueOfField": [
               {
                    "number": "1",
                    "content": "second"
               },
               {
                    "number": "10",
                    "content": "Y"
               }
               /* more as needed */
          ]
    }
}

I can do everything up to valueOfField.

Here is my code:

sync cu = new sync();
cu.first = "James";
cu.last = "Doe";
cu.email = "[email protected]";
cu.cell = "999-999-9999";
/*for (int i = 0; i < 2; i++)
{
    cu.valueOfField.Add("1", "106-93-0909");
    cu.valueOfField.Add("5", "12/3/1995");
}*/
string json = Newtonsoft.Json.JsonConvert.SerializeObject(new { sync = cu });
...
public class sync
{
    public string first;
    public string last;
    public string email;
    public string cell;
    /*public IDictionary<string, string> valueOfField;*/
}

I tried adding an IDictionary but that didn't work.

Can I get some help in creating the valueOfField.

pm100 · Accepted Answer · 2022-03-13 00:41:44Z

1

you need another class for the valueOfs

public class ValueOf{
  public string number {get;set;}
  public string content {get;set;}
}

then

public class sync
{
    public string first;
    public string last;
    public string email;
    public string cell;
    public List<ValueOf> valueOfField = new List<ValueOf>();
}

now

   cu.valueOfField.Add(new ValueOf{
         Number="1", Content = "106-93-0909"
   });
   cu.valueOfField.Add(new ValueOf{
         Number = "5", Content = "12/3/1995"); 
   });

edited Mar 13, 2022 at 0:41

answered Mar 13, 2022 at 0:26

pm100

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4 Comments

Si8 Over a year ago

Thank you... The example topped off the answer! Appreciate it. IT all maks sense, drew a blank for a bit :) +1

Si8 Over a year ago

I get a System.NullReferenceException: 'Object reference not set to an instance of an object.' error in those example... Don't I have to initialize the list?

pm100 Over a year ago

@Si8 yes sorry see edit

Si8 Over a year ago

I just did it during the population of values... but your works as well. Either or works. :)

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