我喜欢从Application_Start()做它的解决方案，在这里的答案

显然，我不能在JavaScript中使用我的函数中的配置访问json对象，因为在DalSoft的答案中返回的对象在对象的(键，val)上都有“\n \r”。

不管怎样，只要能工作就好(因为不同的方法在不同的场景下工作，这取决于所提出的意见和问题)，尽管最好采用一种标准的方法，并提供一些良好的文档支持该方法。

最好的解决方案是从Web API中的循环引用处理(这个答案的大部分都是从这里复制的):

修复1:全局忽略循环引用

(我已经选择/尝试了这一个，就像其他许多人一样)

The json.net serializer has an option to ignore circular references. Put the following code in WebApiConfig.cs file: config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore; The simple fix will make serializer to ignore the reference which will cause a loop. However, it has limitations: The data loses the looping reference information The fix only applies to JSON.net The level of references can't be controlled if there is a deep reference chain

如果你想在非api的ASP中使用这个修复。NET项目，你可以添加上述行到Global.asax.cs，但首先添加:

var config = GlobalConfiguration.Configuration;

如果你想在.Net Core项目中使用它，你可以将Startup.cs更改为:

var mvc = services.AddMvc(options =>
{
   ...
})
.AddJsonOptions(x => x.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);

Fix 2: Preserving circular reference globally This second fix is similar to the first. Just change the code to: config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Serialize; config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects; The data shape will be changed after applying this setting. [ { "$id":"1", "Category":{ "$id":"2", "Products":[ { "$id":"3", "Category":{ "$ref":"2" }, "Id":2, "Name":"Yogurt" }, { "$ref":"1" } ], "Id":1, "Name":"Diary" }, "Id":1, "Name":"Whole Milk" }, { "$ref":"3" } ] The $id and $ref keeps the all the references and makes the object graph level flat, but the client code needs to know the shape change to consume the data and it only applies to JSON.NET serializer as well. Fix 3: Ignore and preserve reference attributes This fix is decorate attributes on model class to control the serialization behavior on model or property level. To ignore the property: public class Category { public int Id { get; set; } public string Name { get; set; } [JsonIgnore] [IgnoreDataMember] public virtual ICollection<Product> Products { get; set; } } JsonIgnore is for JSON.NET and IgnoreDataMember is for XmlDCSerializer. To preserve reference: // Fix 3 [JsonObject(IsReference = true)] public class Category { public int Id { get; set; } public string Name { get; set; } // Fix 3 //[JsonIgnore] //[IgnoreDataMember] public virtual ICollection<Product> Products { get; set; } } [DataContract(IsReference = true)] public class Product { [Key] public int Id { get; set; } [DataMember] public string Name { get; set; } [DataMember] public virtual Category Category { get; set; } } JsonObject(IsReference = true)] is for JSON.NET and [DataContract(IsReference = true)] is for XmlDCSerializer. Note that: after applying DataContract on class, you need to add DataMember to properties that you want to serialize. The attributes can be applied on both json and xml serializer and gives more controls on model class.

您也可以将属性应用到属性。 [JsonProperty(ReferenceLoopHandling =…)属性非常适合这一点。

例如:

/// <summary>
/// Represents the exception information of an event
/// </summary>
public class ExceptionInfo
{
    // ...code omitted for brevity...

    /// <summary>
    /// An inner (nested) error.
    /// </summary>
    [JsonProperty( ReferenceLoopHandling = ReferenceLoopHandling.Ignore, IsReference = true )]
    public ExceptionInfo Inner { get; set; }

    // ...code omitted for brevity...    
}

希望有帮助， 扬

请确保在您的方法中使用await和async。如果对象没有正确序列化，就会出现此错误。

我们可以将这两行添加到DbContext类构造函数中以禁用Self引用循环，例如

public TestContext()
        : base("name=TestContext")
{
    this.Configuration.LazyLoadingEnabled = false;
    this.Configuration.ProxyCreationEnabled = false;
}

只需更新Startup.cs文件中的services.AddControllers()即可

services.AddControllers()
  .AddNewtonsoftJson(options =>
      options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
   );