那应该不是这里的问题，下面的代码是我自定义登录窗口“确定”的代码

我中途要切换用户无法完成是怎么回事？我查了下系统命令里没有重新载入的命令呀。。

Dim UserName As String = e.Form.Controls("用户名").Value
Dim cmd As New SQLCommand
Dim dt As DataTable
Dim dr As DataRow
cmd.C
If UserName = ""  Then
    Messagebox.show("请选择用户!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
cmd.CommandText = "Select * From {用户管理} Where [用户名] = \'" & UserName & "\'"
dt = cmd.ExecuteReader
If dt.DataRows.Count = 0 Then
    Messagebox.show("此用户不存在!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
dr = dt.DataRows(0)
If e.Form.Controls("密码").Value = dr("密码") Then
    _UserName = UserName
    _UserGroup = dr("用户分组")
    _UserDep = dr("部门")
    e.Form.Close
Else
    Messagebox.show("密码错误!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If

Dim xt As RibbonMenu.Button
xt = ConfigBar.Items("设计系统登录")
If _UserGroup <> "开发者"
    TableCaptionVisible = False
    xt.Visible = False
End If
Forms("系统主窗口").Open()
Dim tl1 As WinForm.TopicLink
tl1 = Forms("系统主窗口").Controls("TopicBar1").pages("用户管理").links("用户设置")
If _UserGroup <> "开发者" AndAlso _UserGroup <> "系统管理员"
    tl1.Visible = False
End If

Syscmd.Project.Load()

加入这条命令后就出现错误了