从组合框数据（从数据库加载）Winform 中反序列化 json 对象

Question

Good morning, I'm having a hard time finding solution to my problem. I have a combobox which is populated using datasource which is from DB and those data where JSON objects. How will I deserialize those data? This is the JSON data from Database:

{"displayname":{"value":"Test","scope":"contacts","verified":"0"},"address":{"value":"","scope":"private","verified":"0"},"website":{"value":"","scope":"private","verified":"0"},"email":{"value":"","scope":"contacts","verified":"0"},"avatar":{"scope":"contacts","verified":"0"},"phone":{"value":"01234567890","scope":"private","verified":"0"},"twitter":{"value":"","scope":"private","verified":"0"}}

And below is what will be shown in the combobox. I don't want a JSON object in my combobox but instead a deserialized data. Ex: I want to only show the names in my combobox which is the value under displayname in JSON Object.

Answer 1

Download and install Newtonsoft.Json package from NuGet. then you can Deserialize your JSON string and add it to your Combobox items.

eg

//using Newtonsoft.Json;
//using Newtonsoft.Json.Linq;

    string jsonStr = "Your JsonString ... ";
    var parsed = JsonConvert.DeserializeObject<JObject>(jsonStr);
    string[] lst = parsed.Properties().Select(q => q.Name).ToArray();
    comboBox1.Items.AddRange(lst);

---

if you want to have separate DisplayMember and ValueMember you can use your JProperty array as a DataSource.

eg

    string jsonStr = "Your JsonString ... ";
    var parsed = JsonConvert.DeserializeObject<JObject>(jsonStr);
    comboBox1.DataSource = parsed.Properties().ToArray();
    comboBox1.DisplayMember = "Name";
    comboBox1.ValueMember = "Value";

when you use a DataSource the comboBox1.SelectedItem also is a JProperty. so you can use this object to access other data in your json string.

eg

   private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
   {
      // selectedValue is equal to `value` in the json string
      var selectedValue = ((JProperty)comboBox1.SelectedItem).Value.Value<string>("value");
      MessageBox.Show(selectedValue); 
   }

Answer 2

Create a class as your Combo box Data Source like this,

public class Displayname
{
    public string scope;
    public string value; // as your display member in combobox
    public int verified;
}
public class MyData
{
    public string address;
    public Displayname displayname;
}

then deserialize your JSON to an object of MyData like this

string json = @"{
                'displayname': {'value' : 'james@example.com',
  'scope': 'contacts'},
  'verified': '0' } ,  'address':'blabla' ";
    var t = JsonConvert.DeserializeObject<MyData>(json);
combobox.datasource = t.displayname; // not sure about syntax of this line,

Then in combobox property set the display member as value (this is the name of the property you have in your json and also you have in Deserialized class which is Displayname). exactly write the the name of the property that you want.

by the way, value is not good name for display member and the json string you provided I believe is not right json. good luck