Question

好的我有一个类，一个dbml文件和一个表单。我的项目名为“演示项目”

表格 - DriveTimeActiveVendorsFrom dbml - Dataworld class - tblDriveTimeActiveVendors

我的表单包含以下代码

 Imports System.Data.Linq.Mapping

 Public Class DriveTimeActiveVendorsForm

Private dc As New DataworldDataContext.DataworldDataContext
Dim _insert As New tblDrivetimeActiveVendors

Private Sub insertVendor()
    dc = New DataworldDataContext.DataworldDataContext
    _insert.ASRVendor = TextBox1.Text
    _insert.AddressLine1 = TextBox2.Text
    _insert.City = TextBox3.Text
    dc.tblDriveTimeActiveVendors.InsertOnSubmit(_insert)
End Sub

 End Class

我的课程包含以下内容

 Public Class tblDrivetimeActiveVendors


Private _ASRVendor As String = Nothing
Private _AddressLine1 As String = Nothing
Private _City As String = Nothing



Public Property ASRVendor() As String
    Get
        Return _ASRVendor
    End Get
    Set(ByVal value As String)
        If value Is Nothing Then
            _ASRVendor = Nothing
        Else
            _ASRVendor = value.Trim
        End If
    End Set
End Property

Public Property AddressLine1() As String
    Get
        Return _AddressLine1
    End Get
    Set(ByVal value As String)
        If value Is Nothing Then
            _AddressLine1 = Nothing
        Else
            _AddressLine1 = value.Trim
        End If
    End Set
End Property

Public Property City() As String
    Get
        Return _City
    End Get
    Set(ByVal value As String)
        If value Is Nothing Then
            _City = Nothing
        Else
            _City = value.Trim
        End If
    End Set
End Property

我在下一行收到错误

    dc.tblDriveTimeActiveVendors.InsertOnSubmit(_insert)

它是“_insert”部分，错误是

    Value of type 'WindowsApplication1.tblDrivetimeActiveVendors' cannot be converted to 'WindowsApplication1.DataworldEntity.tblDriveTimeActiveVendor'.    C:\Users\rmonzing\Documents\Visual Studio 2008\Projects\DemoProject\DemoProject\DriveTimeActiveVendorsForm.vb   13  53  DemoProject

我在这里缺少什么？感谢

Answer 1

变量_insert被声明为tblDrivetimeActiveVendors（复数）类型的对象，但InsertOnSubmit期望一个类型为'tblDrivetimeActiveVendor'的对象（单数）。

在代码的某处，某些东西已经声明了一个类tblDrivetimeActiveVendor，它（可能）包含与数据库表中的列对应的属性。您需要使用此对象而不是上面发布的类。

不理解Linq到Sql的这个错误

1 个答案: