解决MVC Json序列化的循环引用问题/EF Json序列化循引用问题---Newtonsoft.Json

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());
        }
    }
}

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