错误“无法将 JSON 值转换为 System.String。路径：$[1].Interests[1].Meta[9].Content | LineNumber: 0 | BytePositionInLine: 10073。”

Question

public Class Employee{

  public string Name { get; set; }

  [Column(TypeName = "jsonb")]
  public List<Section> Sections { get; set; }

}

public Class Sections{

   public string Booking { get; set; }


  [Column(TypeName = "jsonb")]
  public List<Interest> Interests { get; set; }

}

public Class Interest{

  public string Title { get; set; }

  public List<Meta> Meta { get; set; }


  public List<WithAlt> Images { get; set; }
}

public Class Meta{

      public string Type { get; set; }

     public string Content { get; set; }

}

public Class WithAlt{

     public string content { get; set; }

     public string Alt { get; set; }

}

我从 Employee 表中获取数据

员工在获取数据时 Sections Column 我得到了

The JSON value could not be converted to System.String. Path: $[1].Interests[1].Meta[9].Content | LineNumber: 0 | BytePositionInLine: 10073. 

发生错误

public Task<Employee> CheckEmployee(string name){

// error throw Line
var query= await catalogDbContext.Employee
             .Where(i.Name === name)
            .FirstOrDefault();
}

并非所有价值，而是List<Section> 或 List<Interest> 或 List<Meta> 或 List<WithAlt> 具有空值

当我手动将值添加到下面的部分列时

{
  "Booking": "",
  "Interests":[
   {
       "Title":"",

       "Meta":[

          { 
           
             "Type" : " ", 
          
              "Content" : " "
          }
         ],

     "Images" : [
      {
         "content" : " ",

         "alt" : " "
      }
    ]
  }
],

  }

不会报错

有没有办法使用代码优先的方法为上述字段定义默认值

当我初始化 Sections 属性时

public List<Section> Sections { get; set; }={};

它显示以下错误

Can only use array initializer expressions to assign to array types. Try using a new expression instead.

还有

public List<Section> Sections { get; set; }= new List<Section> Sections();

和

public List<Meta> Meta { get; set; }= = new List<Meta>();

和

public List<WithAlt> Images { get; set; }= new List<WithAlt>();

投掷Error "The JSON value could not be converted to System.String. Path: $[1].Interests[1].Meta[9].Content | LineNumber: 0 | BytePositionInLine: 10073."

Answer 1

只能使用数组初始化表达式来分配数组类型。请尝试使用新的表达式。

您可以将json数据转换为Section类型而不是List<Section>类型。

var json = "{\"Booking\":\"\",\"Interests\":[{\"Title\":\"\",\"Meta\":[{\"Type\":\" \",\"Content\":\" \"}],\"Images\":[{\"content\":\" \",\"alt\":\" \"}]}]}";
            var s = JsonConvert.DeserializeObject<Section>(json);
            //If you want to set Employee.Sections with json data,try this
            Employee e = new Employee { Sections = new List<Section> { s } };

模型（将类名 Sections 更改为 Section，Interests 更改为 Interest）：

public class Employee
    {

        public string Name { get; set; }

        [Column(TypeName = "jsonb")]
        public List<Section> Sections { get; set; }

    }

    public class Section
    {

        public string Booking { get; set; }


        [Column(TypeName = "jsonb")]
        public List<Interest> Interests { get; set; }

    }

    public class Interest
    {

        public string Title { get; set; }

        public List<Meta> Meta { get; set; }


        public List<WithAlt> Images { get; set; }
    }

    public class Meta
    {

        public string Type { get; set; }

        public string Content { get; set; }

    }

    public class WithAlt
    {

        public string content { get; set; }

        public string Alt { get; set; }

    }

Answer 2

我刚刚对你的 json 进行反序列化，一切正常，我找不到任何错误

public static void Main()
{
var json = "{\"Booking\":\"\",\"Interests\":[{\"Title\":\"\",\"Meta\":[{\"Type\":\" \",\"Content\":\" \"}],\"Images\":[{\"content\":\" \",\"alt\":\" \"}]}]}";
var jd = JsonConvert.DeserializeObject<Data>(json);
}

类

    public class Data
    {
        public string Booking { get; set; }
        public List<Interest> Interests { get; set; }
    }
    public class Interest
    {
        public string Title { get; set; }
        public List<Meta> Meta { get; set; }
        public List<Image> Images { get; set; }
    }

    public class Meta
    {
        public string Type { get; set; }
        public string Content { get; set; }
    }

    public class Image
    {
        public string content { get; set; }
        public string alt { get; set; }
    }