[英]Problems deserializing using Newtonsoft JSON
I have the following class: 我有以下课程:
public class Student
{
public int studentNumber;
public string testWeek;
public string topics;
}
I do some stuff to it, serialize it and save it in a file. 我对它做了一些处理,对其进行序列化并将其保存在文件中。 It looks likes this:
看起来像这样:
[
{
"studentNumber": 1,
"testWeek": "1",
"topics": "5 & 8"
},
{
"studentNumber": 2,
"testWeek": "1",
"topics": "5 & 8"
},
{
"studentNumber": 3,
"testWeek": "1",
"topics": "5 & 8"
},
{
"studentNumber": 4,
"testWeek": "1",
"topics": "5 & 8"
},
{
"studentNumber": 5,
"testWeek": "1",
"topics": "5 & 8"
}
]
Later I want to deserialize it so I can work on it again. 稍后,我想对其进行反序列化,以便再次进行处理。 I have this code
我有这个代码
Student[] arr = new Student[numberOfStudentsInClass];
arr = JsonConvert.DeserializeObject<Student>(File.ReadAllText(_selectedClass))
Where _selectedClass is string containing the file name. 其中_selectedClass是包含文件名的字符串。 But I am getting an error
但是我遇到一个错误
Cannot convert WindowsFormApplicationsForm1.Form.Student to WindowsFormApplicationsForm1.Form.Student[]
无法将WindowsFormApplicationsForm1.Form.Student转换为WindowsFormApplicationsForm1.Form.Student []
You indicated in your JsonConvert.DeserializeObject that you are trying to deserialize to a single Student
instance. 您在JsonConvert.DeserializeObject中指示要尝试反序列化为单个
Student
实例。 Not an array. 不是数组。 And there's no need to initialize the array in one statement and then assign it a value on another.
而且,无需在一个语句中初始化数组,然后在另一个语句上为其分配值。 And anyways, we generally use generic arrays these days.
而且无论如何,这些天我们通常使用通用数组。
Replace: 更换:
Student[] arr = new Student[numberOfStudentsInClass];
arr = JsonConvert.DeserializeObject<Student>(File.ReadAllText(_selectedClass))
With this: 有了这个:
List<Student> students =
JsonConvert.DeserializeObject<List<Student>>(File.ReadAllText(_selectedClass));
As the exception states, the method JsonConvert.DeserializeObject<Student>
returns an object of type Student
, while the variable arr
is of type Student[]
.so you can't assign the result of JsonConvert.DeserializeObject<Student>
to arr
. 作为异常状态,方法
JsonConvert.DeserializeObject<Student>
返回类型为Student
的对象,而变量arr
的类型为Student[]
,因此您无法将JsonConvert.DeserializeObject<Student>
的结果分配给arr
。
you need to Deserialize your text to a List<Student>
instead and call .ToArray
if you want an array such as follows: 您需要将文本反序列
.ToArray
List<Student>
,如果需要数组,请调用.ToArray
,如下所示:
Student[] students = JsonConvert.DeserializeObject<List<Student>>(File.ReadAllText(_selectedClass)).ToArray();
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