导入 ".xls"文件时：   

Else If fl.ToLower.EndsWith(".xls") Then
            Dim Book As New xls.Book(fl)
            For Each Sheet As xls.Sheet In Book.Sheets \'引用新增加的工作表
                Dim mg As New Merger
                mg.SourcePath = fl \'指定数据文件所在目录
                mg.Format = "excel" \'指定格式
                mg.SourceTableName = sheet.Name & "$"
                mg.DataTableName = "成绩库" \'指定接收数据的表
                mg.Merge() \'开始合并
            Next
如果导入的是".xlsx“文件，怎么修改代码？请指教。谢谢！

Else If fl.ToLower.EndsWith(".xls") Then

改成

Else If fl.ToLower.EndsWith(".xls") OrElse fl.ToLower.EndsWith(".xlsx")  Then

收到。谢谢！但只能导入一个文件了，不能导入多个文件。请指教。谢谢！

Dim dlg As New OpenFileDialog
dlg.MultiSelect = True
dlg.Filter= "数据库文件|*.dbf;*.xls;*.xlsx|全部|*.*"
If dlg.ShowDialog = DialogResult.OK Then
    For Each fl As String In dlg.FileNames
        If fl.ToLower.EndsWith(".dbf") Then
            Dim wjm As String = FileSys.GetName(fl)
            Dim mg As New Merger
            mg.SourcePath = FileSys.GetParentPath(fl) \'指定数据文件所在目录
            mg.Format = "dbase" \'指定格式
            mg.SourceTableName =  wjm \'指定要合并的dbase文件,无需扩展名
            mg.DataTableName = "成绩库" \'指定接收数据的表
            mg.Merge() \'开始合并
        Else If fl.ToLower.EndsWith(".xls") Then
            Dim Book As New xls.Book(fl)
            For Each Sheet As xls.Sheet In Book.Sheets \'引用新增加的工作表
                Dim mg As New Merger
                mg.SourcePath = fl \'指定数据文件所在目录
                mg.Format = "excel" \'指定格式
                mg.SourceTableName = sheet.Name & "$"
                mg.DataTableName = "成绩库" \'指定接收数据的表
                mg.Merge() \'开始合并
            Next
        Else If fl.ToLower.EndsWith(".xlsx") Then
            Dim Book As New xls.Book(fl)
            For Each Sheet As xls.Sheet In Book.Sheets \'引用新增加的工作表
                Dim mg As New Merger
                mg.SourcePath = fl \'指定数据文件所在目录
                mg.Format = "excel2007" \'指定格式
                mg.SourceTableName = sheet.Name & "$"
                mg.DataTableName = "成绩库" \'指定接收数据的表
                mg.Merge() \'开始合并
            Next
        End If
    Next
End If

已上传汇总名册。谢谢！

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你datacolchanged事件影响了

Dim dlg As New OpenFileDialog
dlg.MultiSelect = True
dlg.Filter= "数据库文件|*.dbf;*.xls;*.xlsx|全部|*.*"
If dlg.ShowDialog = DialogResult.OK Then
    systemready = False
    For Each fl As String In dlg.FileNames
        If fl.ToLower.EndsWith(".dbf") Then
            Dim wjm As String = FileSys.GetName(fl)
            Dim mg As New Merger
            mg.SourcePath = FileSys.GetParentPath(fl) \'指定数据文件所在目录
            mg.Format = "dbase" \'指定格式
            mg.SourceTableName =  wjm \'指定要合并的dbase文件,无需扩展名
            mg.DataTableName = "成绩库" \'指定接收数据的表
            mg.Merge() \'开始合并
        Else If fl.ToLower.EndsWith(".xls") Then
            Dim Book As New xls.Book(fl)
            For Each Sheet As xls.Sheet In Book.Sheets \'引用新增加的工作表
                Dim mg As New Merger
                mg.SourcePath = fl \'指定数据文件所在目录
                mg.Format = "excel" \'指定格式
                mg.SourceTableName = sheet.Name & "$"
                mg.DataTableName = "成绩库" \'指定接收数据的表
                mg.Merge() \'开始合并
            Next
        Else If fl.ToLower.EndsWith(".xlsx") Then
            Dim Book As New xls.Book(fl)
            For Each Sheet As xls.Sheet In Book.Sheets \'引用新增加的工作表
                Dim mg As New Merger
                mg.SourcePath = fl \'指定数据文件所在目录
                mg.Format = "excel2007" \'指定格式
                mg.SourceTableName = sheet.Name & "$"
                mg.DataTableName = "成绩库" \'指定接收数据的表
                mg.Merge() \'开始合并
            Next
        End If
    Next
    DataTables("成绩库").DeleteFor("单位 is null")
    systemready = True
End If

e.Form.Controls("Label1").Text = "数据导入结束,可以进行分项统计!"