Json.NET - Json library for Javascript

The Json.NET library allows the simple and safe reading and writing of JSON objects from .NET. Using readers and writers, and makes passing messages between .NET and JavaScript a snap.

Json.NET CodePlex Project

I have the user class like below,

public class User
{
	public int UserId { get; set;}
	public string Name { get; set;}
	public string Note { get; set;}
}

If I want to serialize a list of user directly to web page, so javascript can further process it, I can call SerializeObject in the view:

Newtonsoft.Json.JsonConvert.SerializeObject(Model.Users)

This will render the following string to browser:

[{"UserId":"1","Name":"Tom","Note":"Great!"},{"UserId":"2","Name":"Jim","Note":"Sweet!"}]

In the view, I render a dropdown of user,

                            <% = Html.DropDownListFor(m => m.UserId,
                                Model.Users.Select(p => new SelectListItem
                                {
                                    Text = p.Name,
                                    Value = p.UserId.ToString(),
                                    Selected = p.UserId == Model.UserId
                                }), "Please Select", new { onchange = "onUserChange(this.value);" })%>

In the user dropdown, if the user was changed, I update the note for this user by javascript, without going back to server

Because we are using Json in the view, be sure to add the namespace to web.config,