主题：代码不执行，高手请进

With Tables("长期医嘱")
    .Position = .Rows.Count - 1
End With
If e.form.Controls("ComboBox1").Value Is Nothing Or e.form.Controls("ComboBox4").Value Is Nothing Then
    MsgBox("请选择患者住院号和追加类别!",64,"提示")
If Tables("长期医嘱").Rows.count >0 Then
Dim cm4 As WinForm.ComboBox = e.Form.Controls("ComboBox4")
    Dim f As New Filler
    f.SourceTable = DataTables("追加项目")
    f.SourceCols = "拼音码,项目名称"
    f.DataTable = DataTables("长期医嘱")
    f.DataCols = "拼音码,项目名称"
    f.Filter = "分组名称 ='" & cm4.Value & "'"
    f.Fill()
Dim Nu ,X ,Rq,Ys As String
Nu =CurrentTable.Current("编号")
X = e.Form.Controls("ComboBox1").value
Rq= e.Form.Controls("DateTimePicker1").value
Ys=e.Form.Controls("ComboBox5").value
Dim drs As List(Of DataRow)
drs = DataTables("长期医嘱").Select("[编号] >'" & Nu &"'")
For Each dr As DataRow In drs
    dr("住院号") = X
    dr("开嘱日期") = Rq
    dr("医生") = Ys
Next
With Tables("长期医嘱")
    .Position = .Rows.Count - 1
End With
Else
Dim cm4 As WinForm.ComboBox = e.Form.Controls("ComboBox4")
    Dim f As New Filler
    f.SourceTable = DataTables("追加项目")
    f.SourceCols = "拼音码,项目名称"
    f.DataTable = DataTables("长期医嘱")
    f.DataCols = "拼音码,项目名称"
    f.Filter = "分组名称 ='" & cm4.Value & "'"
    f.Fill()
Dim Nu ,X ,Rq,Ys As String
Nu =CurrentTable.Current("编号")
X = e.Form.Controls("ComboBox1").value
Rq= e.Form.Controls("DateTimePicker1").value
Ys=e.Form.Controls("ComboBox5").value
Dim drs As List(Of DataRow)
drs = DataTables("长期医嘱").Select("[编号] ='" & Nu &"'")
For Each dr As DataRow In drs
    dr("住院号") = X
    dr("开嘱日期") = Rq
    dr("医生") = Ys
Next
With Tables("长期医嘱")
    .Position = .Rows.Count - 1
End With
End If
End If

问题可能出在If语句上。

我的意思：

第一步：返回最末行

第二步：如果表中为空行，执行第二个IF

否则执行else