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How to build object hierarchy for serialization with json.net?

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醉梦人生
醉梦人生 2020-12-24 02:30

I\'m trying to properly write code to build a data structure to serialize into json.

I\'m using json.net.

I don\'t want to create a bunch of classes to hold

3条回答
  • 情歌与酒
    情歌与酒 (楼主)
    2020-12-24 03:01

    I think what you're asking is how to serialize complex business objects in json, but only expose certain properties.

    In other words you already have a list of students, but you only want to send very specific data via json. If I'm wrong this answer won't suit your needs.

    So assuming you have a list of students, with a projects property that has an inner property of tasks, this is how I do it without having to create loads of new classes, I use anonymous objects.

    Once I've created my list of anonymous objects, I simply turn them into a json string.

    As pointed out in the comments you don't need to use json.net, this functionality is available in the framework, add a reference to System.Web.Extensions.dll then

    using System.Web.Script.Serialization;

    var jsonStudents = new List();

foreach (var student in students)
{
    jsonStudents.Add(new
    {
        student.Id,         //anonymous properties automatically pick up the name of the property you pass them, this will be called Id
        FullName = student.FirstName + " " + student.LastName, //if you want to name a property yourself use this notation
        Projects = student.Projects.Select(p => new //this will be an enumerable of nested anonymous objects, we're partially selecting project properties
        {
            p.Id,
            p.Name,
            Tasks = p.Tasks.Select(t => new //nesting another level
            {
                t.Id,
                t.Name
            })
        })
    });
}

var serializer = new JavaScriptSerializer();

var jsonString = serializer.Serialize(jsonStudents);



    If you really want to use loops you can do this to allow you to do more complicated things in the creating of the projects and tasks:
    


    var jsonStudents = new List();

foreach (var student in students)
{
    var tempStudent = new
    {
        student.Id,         //anonymous properties automatically pick up the name of the property you pass them, this will be called Id
        FullName = student.FirstName + " " + student.LastName, //if you want to name a property yourself use this notation
        Projects = new List()
    };

    foreach (var project in student.Projects)
    {
        var tempProject = new {
            project.Id,
            project.Name,
            Tasks = new List()
        };

        foreach (var task in project.Tasks)
        {
            tempProject.Tasks.Add(new {
                task.Id,
                task.Name
            });
        }

        tempStudent.Projects.Add(tempProject);
    }

    jsonStudents.Add(tempStudent);
}

var serializer = new JavaScriptSerializer();

var jsonString = serializer.Serialize(jsonStudents);

    
    
             
    
                                                        
    
            
            
    
              
                
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