ASP.NET MVC 遇到JSON循环调用的问题应该怎么解决？-木庄网络博客

本文摘自PHP中文网，作者零下一度，侵删。

1..Net开源Json序列化工具Newtonsoft.Json中提供了解决序列化的循环引用问题：

方式1：指定Json序列化配置为 ReferenceLoopHandling.Ignore

方式2：指定 JsonIgnore忽略引用对象

实例1，解决MVC的Json序列化引用方法：

step1:在项目上添加引用 Newtonsoft.Json程序包，命令：Insert-Package Newtonsoft.Json

step2:在项目中添加一个类，继承JsonResult，代码如下：

/// <summary>/// 继承JsonResut，重写序列化方式/// </summary>public class JsonNetResult : JsonResult
{public JsonSerializerSettings Settings { get; private set; }public JsonNetResult()
    {
        Settings = new JsonSerializerSettings
        {//这句是解决问题的关键,也就是json.net官方给出的解决配置选项.                 
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
        };
    }public override void ExecuteResult(ControllerContext context)
    {if (context == null)throw new ArgumentNullException("context");if (this.JsonRequestBehavior == JsonRequestBehavior.DenyGet && string.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))throw new InvalidOperationException("JSON GET is not allowed");
        HttpResponseBase response = context.HttpContext.Response;
        response.ContentType = string.IsNullOrEmpty(this.ContentType) ? "application/json" : this.ContentType;if (this.ContentEncoding != null)
            response.ContentEncoding = this.ContentEncoding;if (this.Data == null)return;var scriptSerializer = JsonSerializer.Create(this.Settings);using (var sw = new StringWriter())
        {
            scriptSerializer.Serialize(sw, this.Data);
            response.Write(sw.ToString());
        }
    }
}

step3:在项目添加BaseController，重写Json()方法，代码如下：

public class BaseController : Controller
{public StudentContext _Context = new StudentContext();/// <summary>/// 重写，Json方法，使之返回JsonNetResult类型/// </summary>protected override JsonResult Json(object data, string contentType,
        Encoding contentEncoding, JsonRequestBehavior behavior)
    {return new JsonNetResult
        {
            Data = data,
            ContentType = contentType,
            ContentEncoding = contentEncoding,
            JsonRequestBehavior = behavior
        };
    }
}

step4.向平时一样使用就可以了

//获取列表public JsonResult GetList()
{
    List<student> list = _Context.students.Where(q => q.sno == "103").ToList();//方法1return Json(list);//方法2//return new JsonNetResult() {//    Data=list//};
}