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
在尝试将类类型的对象添加到 JArray 时遇到以下错误.
I got the following error while trying to add an object of type class to the JArray.
Could not determine JSON object type for type "Class"
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;
}
运行该程序时,我将其命名如下:
And I call it like the following when run the program:
_JArray = NArray(repository);
Console.WriteLine(JsonConvert.SerializeObject(_JArray));
如何转换 _JArray(JArray)内部的 AmountModel(类),以使系统识别为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
为了向JArray
添加任意非原始POCO,必须使用 JToken.FromObject()
:
In order to add an arbitrary non-primitive POCO to a JArray
, 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;
(还要注意,我已纠正了for
循环中的结束条件.它是i <= amounts.Length
,这导致了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小提琴#1 此处.
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 }));
样本小提琴#2 此处.
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