c# - 在 ASP.NET MVC 中全局应用 JSON 序列化程序设置

Question

Entity Framework Navigation 属性在我的 Kendo Grid 尝试序列化我的 查看模型。我们正在使用 Newtonsoft.JSON，所以我想在我的 Application_Start 中(全局)将 "ReferenceLoopHandling" 设置为 "Ignore" ()。

奇怪的是，ASP.NET 似乎不遵守该设置...所以我仍然遇到异常。

...有什么想法吗？

版本:

• 微软.AspNet.Mvc (5.2.3.0)
• Microsoft.AspNet.WebApi (5.2.3)
• Newtonsoft.Json (10.0.3)

示例应用_START:
移动到顶部 或底部 的调用不会改变结果...

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    GlobalConfiguration.Configure(WebApiConfig.Register);
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);
    LoadSiteMap();

    var json = GlobalConfiguration.Configuration.Formatters.JsonFormatter;
    json.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
}

示例 Razor 标记:
注意“绑定(bind)到”选项...

@(Html.Kendo().Grid<RTUDeviceControlRoomAlarm>()
              .Columns(columns =>
              {
                  columns.Bound(x => x.Id)
                      .Visible(false);
                  columns.Bound(x => x.RTUDeviceId)
                      .Visible(false);
                  columns.Bound(x => x.Register)
                      .Title("Register")
                      .Width(50);
                  columns.Bound(x => x.Description)
                      .Title("Description")
                      .Width(100);
                  columns.Bound(x => x.LowLowLimitOFF)
                      .Title("LL Limit/OFF")
                      .Width(50);
                  columns.Bound(x => x.LowLowLimitON)
                      .Title("LL Limit/ON")
                      .Width(50);
                  columns.Bound(x => x.HiLimit)
                      .Title("Hi Limit")
                      .Width(50);
                  columns.Bound(x => x.HiHiLimit)
                      .Title("HH Limit")
                      .Width(50);
                  columns.Command(command => { command.Edit(); command.Destroy(); }).Width(70);
              })
              .Name("gridControlRoomAlarms")
              .ToolBar(toolbar => toolbar.Create())
              .Editable(editable => editable.Mode(GridEditMode.InLine))
              .Sortable()
              .Scrollable()
              .BindTo(Model.RTUDeviceControlRoomAlarms)
              .DataSource(dataSource => dataSource.Ajax()
                                                  .PageSize(50)
                                                  .Model(model => { model.Id(m => m.Id); })
                                                  .Create(update => update.Action("Create", "ControlRoomAlarm", new { Area = "Documents" }))
                                                  .Update(update => update.Action("Update", "ControlRoomAlarm", new { Area = "Documents" }))
                                                  .Destroy(update => update.Action("Destroy", "ControlRoomAlarm", new { Area = "Documents" }))
                                                  )
              .HtmlAttributes(new { @class = "", @style = "height: 400px;" }))

更新:
也试过...

• GlobalConfiguration.Configuration.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

Answer 1

尝试在您的 Application_Start() 中添加此配置作为最后一行:

json.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.None;

参见 https://www.newtonsoft.com/json/help/html/PreserveObjectReferences.htm并注意代码中可能产生的副作用