尝试更新用户详细信息、asp.net 成员资格时出错

Question

我正在使用 asp.net 成员资格并尝试更新用户详细信息，但收到以下错误：

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

在我有之前：

 Dim user As MembershipUser

并得到错误：

对象引用未设置为 对象的实例。说明：一个 期间发生未处理的异常 当前网络的执行 要求。请查看堆栈跟踪 有关错误的更多信息 以及它起源于代码的位置。

异常详情： System.NullReferenceException：对象 引用未设置为 对象。

来源错误：

第 20 行：'无参数 构造函数第 21 行：第 22 行：
用户.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))

对于我缺乏编程知识，我深表歉意。您能否指出我需要在哪里更改代码才能更新用户详细信息？

谢谢

Answer 1

在Membership.GetUser(username) 中需要添加第二个参数 IsUserOnline (Boolean)： Membership.GetUser(username, true)

变量Membership被初始化为Membership.Provider?