尝试更新用户详细信息，asp.net成员时出错

Question

我正在使用asp.net成员身份并尝试更新用户详细信息，但出现以下错误：

Error    2    Overload resolution failed because no accessible 'New' accepts this number of arguments. 

以下是完整的.vb代码：

Partial Class FamilyAdmin_edit_user
    Inherits System.Web.UI.Page

    Private username As String

    Dim user As MembershipUser

    Private Sub Page_Load()
        username = Request.QueryString("username")
        If username Is Nothing OrElse username = "" Then
            Response.Redirect("users.aspx")
        End If
        User = Membership.GetUser(username)

        UserUpdateMessage.Text = ""
    End Sub

    Protected Sub UserInfo_ItemUpdating(ByVal sender As Object, ByVal e As DetailsViewUpdateEventArgs)
        'Need to handle the update manually because MembershipUser does not have a
        'parameterless constructor  

        user.Email = DirectCast(e.NewValues(0), String)
        user.Comment = DirectCast(e.NewValues(1), String)
        user.IsApproved = CBool(e.NewValues(2))

        Try
            ' Update user info:
            Membership.UpdateUser(user)

            ' Update user roles:
            UpdateUserRoles()

            UserUpdateMessage.Text = "Update Successful."

            e.Cancel = True
            UserInfo.ChangeMode(DetailsViewMode.[ReadOnly])
        Catch ex As Exception
            UserUpdateMessage.Text = "Update Failed: " + ex.Message

            e.Cancel = True
            UserInfo.ChangeMode(DetailsViewMode.[ReadOnly])
        End Try
    End Sub

    Private Sub Page_PreRender()
        ' Load the User Roles into checkboxes.
        UserRoles.DataSource = Roles.GetAllRoles()
        UserRoles.DataBind()

        ' Disable checkboxes if appropriate:
        If UserInfo.CurrentMode <> DetailsViewMode.Edit Then
            For Each checkbox As ListItem In UserRoles.Items
                checkbox.Enabled = False
            Next
        End If

        ' Bind these checkboxes to the User's own set of roles.
        Dim userRoles__1 As String() = Roles.GetRolesForUser(username)
        For Each role As String In userRoles__1
            Dim checkbox As ListItem = UserRoles.Items.FindByValue(role)
            checkbox.Selected = True
        Next
    End Sub

    Private Sub UpdateUserRoles()
        For Each rolebox As ListItem In UserRoles.Items
            If rolebox.Selected Then
                If Not Roles.IsUserInRole(username, rolebox.Text) Then
                    Roles.AddUserToRole(username, rolebox.Text)
                End If
            Else
                If Roles.IsUserInRole(username, rolebox.Text) Then
                    Roles.RemoveUserFromRole(username, rolebox.Text)
                End If
            End If
        Next
    End Sub

    Public Sub DeleteUser(ByVal sender As Object, ByVal e As EventArgs)
        'Membership.DeleteUser(username, false); // DC: My apps will NEVER delete the related data.
        Membership.DeleteUser(username, True)
        ' DC: except during testing, of course!
        Response.Redirect("manage_members.aspx")
    End Sub

    Public Sub UnlockUser(ByVal sender As Object, ByVal e As EventArgs)
        ' Dan Clem, added 5/30/2007 post-live upgrade.

        ' Unlock the user.
        User.UnlockUser()

        ' DataBind the GridView to reflect same.
        UserInfo.DataBind()
    End Sub

End Class

在我之前：

 Dim user As MembershipUser

并得到错误：

你调用的对象是空的。 说明：执行当前Web请求期间发生未处理的异常。 请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。

异常详细信息：System.NullReferenceException：对象引用未设置为对象的实例。

源错误：

第20行：'无参数构造函数第21行：第22行：
user.Email = DirectCast（e.NewValues（0），字符串）第23行：user.Comment = DirectCast（e.NewValues（1），字符串）第24行：user.IsApproved = CBool​​（e.NewValues（2））

对于缺乏编程知识，我深表歉意。 您能否指出我需要更改代码以更新用户详细信息的位置？

谢谢

Answer 1

在Membership.GetUser(username)您需要添加第二个参数IsUserOnline（布尔值）： Membership.GetUser(username, true)

变量Membership用Membership.Provider初始化？