无法确定类型“Class"的 JSON 对象类型. [英] Could not determine JSON object type for type "Class"

问题描述

尝试将类类型的对象添加到 JArray 时出现以下错误.

I got the following error while trying to add an object of type class to the JArray.

无法确定类型Class"的 JSON 对象类型

这是我正在使用的代码:

Here is the code that I am using:

private dynamic _JArray = null

private JArray NArray(Repository repository)
    {
        _JArray = new JArray();

        string[] amounts = repository.Amounts.Split('|');

        for (int i = 0; i <= amounts.Length; i++)
        {
            _JArray.Add(
                new AmountModel
                {
                    Amounts = amounts[i],
                });
        }

        return _JArray;
    }

public class AmountModel
{
    public string Amounts;
}

我在运行程序时这样称呼它:

And I call it like the following when run the program:

_JArray = NArray(repository);

Console.WriteLine(JsonConvert.SerializeObject(_JArray));

如何将_JArray (JArray)中的AmountModel (class)转换为JSON对象?

How can I convert the AmountModel (class) inside of _JArray (JArray), to be recognized by the system as JSON object?

非常感谢您的回答.

谢谢.

推荐答案

为了将任意非原始 POCO 添加到 JArray(或 JObject)，您必须使用 JToken.FromObject() 的重载之一显式序列化它:

In order to add an arbitrary non-primitive POCO to a JArray (or JObject), you must explicitly serialize it, using one of the overloads of JToken.FromObject():

_JArray = new JArray();

string[] amounts = repository.Amounts.Split('|');

for (int i = 0; i < amounts.Length; i++)
{
    _JArray.Add(JToken.FromObject(
        new AmountModel
        {
            Amounts = amounts[i],
        }));
}

return _JArray;

(另请注意，我更正了 for 循环中的结束条件.它是 i <= amount.Length，导致 IndexOutOfRangeException 异常.)

(Note also that I corrected the end condition in your for loop. It was i <= amounts.Length, which resulted in an IndexOutOfRangeException exception.)

工作示例 .Net fiddle #1 这里.

Working sample .Net fiddle #1 here.

或者，您可以使用 LINQ 和 JArray.FromObject 简化代码() 通过将字符串数组投影到 AmountModel 可枚举然后在一次调用中将整个序列序列化为 JArray:

Alternatively, you could simplify your code with LINQ and JArray.FromObject() by projecting the string array to an AmountModel enumerable then serializing the entire sequence to a JArray in one call:

var _JArray = JArray.FromObject(amounts.Select(a => new AmountModel { Amounts = a }));

小提琴示例 #2 这里.

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