Question

与this question类似，我正在尝试使用LiteDB文档中的示例，并在运行时出现错误：

Invalid BSON data type 'Null' on field '_id'.

下面是我的代码，其中包括我为解决该问题所做的尝试，即添加注释on the github, here中的_id和Id声明

Public Class Customer
   Public _id As LiteDB.BsonValue
   Public Id As Integer
   Public Name As String
   Public Phones As String
   Public IsActive As Boolean
End Class

Public Class ThisAddIn


  Shared Sub testSub()
    Dim db As New LiteDB.LiteDatabase(Directory.GetCurrentDirectory() & "\DEPDB.db")
    Dim col As LiteDB.LiteCollection(Of Customer)

    col = db.GetCollection(Of Customer)("customer")

    Dim tCustomer As New Customer

    tCustomer.Id = 1
    tCustomer.Name = "John Doe"
    tCustomer.Phones = "12354534"
    tCustomer.IsActive = True

    col.Insert(tCustomer)
  end sub
end class

Answer 1

将类声明略微更改为：

Public Class Customer
  Public Property Id As Integer
  Public Property Name As String
  Public Phones As String
  Public IsActive As Boolean
End Class

允许编译和运行代码，并使用以下命令搜索“名称”字段：

    col.EnsureIndex(Function(x) x.Name)

    Dim tresult = col.FindOne(Function(x) x.Name.Contains("Jo"))

    MsgBox(tresult.Name)

尽管如此，我还是偶然遇到了这个解决方案，在声明中添加了文字……任何解释将不胜感激。

字段'_id'上的BSON数据类型无效'Null'

1 个答案: