C# Json.net linq to Json将null强制转换为JObject抛出异常

例如，我编写这样的代码

        bool hasCustomer = true;

        JObject j = JObject.FromObject(new
        {
            customer = hasCustomer? new
            {
                name = "mike",
                age = 48
            }:null
        });


        JObject c = (JObject)j["customer"];
        if (c != null)
            string name = (string) c["name"];

这个很好用

但是如果我设置hasCustomer=false

       JObject c = (JObject)j["customer"];

将抛出System.InValidCastException：

       Unable to cast object of type 'Newtonsoft.Json.Linq.JValue' to type 'Newtonsoft.Json.Linq.JObject'.

我希望只将null赋值给JObject c，因为JObject是可以为null的

---

那么，处理这种情况的最佳方法是什么？JObject可以为null，但这并不意味着JObject可以强制转换null。 您可以尝试以下方法：

JObject j = JObject.FromObject(new
        {
            customer = hasCustomer? new
            {
                name = "mike",
                age = 48
            }:new Object()
        });

---

忽略null似乎产生了正确的行为

    bool hasCustomer = false ;

    JsonSerializer s = new JsonSerializer() {
        NullValueHandling = NullValueHandling.Ignore
    };
    JObject j = JObject.FromObject( new {
        customer = hasCustomer ? new {
            name = "mike" ,
            age = 48
        } : null
    }, s );


    JObject c = (JObject)j[ "customer" ];