JSON DeserializeObject无法转换或从System.String转换为Model

Could not cast or convert from System.String to
SmartBookLibrary.ViewModel.BookJ1.

Description: An unhandled exception
occurred during the execution of the current web request. Please
review the stack trace for more information about the error and where
it originated in the code.

Exception Details: System.ArgumentException: Could not cast or convert
from System.String to SmartBookLibrary.ViewModel.BookJ1.

这是我的JSON示例：

{
  "authorfamily1": "von Goethe",
  "authorname1": "Johann",
  "authorsurname1": "Wolfgang",
  "title": "Fausto I",
  "extension": "epub",
  "md5": "58cb1dd438bc6c6027fcda9e7729e5ee",
  "isbn": "",
  "descr": "",
  "cover": "1"
},
{
  "authorfamily1": "von Goethe 1",
  "authorname1": "Johann",
  "authorsurname1": "Wolfgang",
  "title": "Fausto I",
  "extension": "epub",
  "md5": "58cb1dd438bc6c6027fcda9e7729e5ee",
  "isbn": "",
  "descr": "",
  "cover": "1"
}

这是代码：

var json = System.IO.File.ReadAllText("/data1.json");           
var courses = JsonConvert.DeserializeObject<Dictionary<string, BookJ1>>(json);

这是我的模型或VM：

public class BookJ1
{
    public string title { get; set; }
    public string isbn { get; set; }
    public string extension { get; set; }
    public string authorfamily1 { get; set; }
    public string authorname1 { get; set; }
    public string md5 { get; set; }
    public int cover { get; set; }
    [AllowHtml]
    [Column(TypeName = "text")]
    public string descr { get; set; }
}

您很可能需要在尝试反序列化该JSON之前将其格式化为数组

var data = System.IO.File.ReadAllText("/data1.json");
var json = string.Format("[{0}]", data);
BookJ1[] courses = JsonConvert.DeserializeObject<BookJ1[]>(json);

但是,如果显示的示例不完整,并且文件中的数据实际上存储为数组

[{
  "authorfamily1": "von Goethe",
  "authorname1": "Johann",
  "authorsurname1": "Wolfgang",
  "title": "Fausto I",
  "extension": "epub",
  "md5": "58cb1dd438bc6c6027fcda9e7729e5ee",
  "isbn": "",
  "descr": "",
  "cover": "1"
},
{
  "authorfamily1": "von Goethe 1",
  "authorname1": "Johann",
  "authorsurname1": "Wolfgang",
  "title": "Fausto I",
  "extension": "epub",
  "md5": "58cb1dd438bc6c6027fcda9e7729e5ee",
  "isbn": "",
  "descr": "",
  "cover": "1"
}]

那么您只需要反序列化为正确的类型

var json = System.IO.File.ReadAllText("/data1.json");           
BookJ1[] courses = JsonConvert.DeserializeObject<BookJ1[]>(json);