请问上述代码错哪儿了？ - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

for each dc1 As datacol in datatables("Zstb").datacols
    for each dc As datacol in datatables("Zszy").datacols
        if dc1.name = dc.name then
            'Exit For 这个不要了,否则遍历完之前一旦有相同的列,就停止执行了~
        elseif dc1.name <> dc.name then
            Dim Len As Integer = DataTables("Zszy").DataCols(dc.name).MaxLength
            DataTables("Zstb").DataCols.Add(dc.name, GetType(string),len)
        end if
    next
next
或者这样:
for each dc1 As datacol in datatables("Zstb").datacols
    for each dc As datacol in datatables("Zszy").datacols
        iif dc1.name <> dc.name then
            Dim Len As Integer = DataTables("Zszy").DataCols(dc.name).MaxLength
            DataTables("Zstb").DataCols.Add(dc.name, GetType(string),len)
        else
            return
        end if
    next
next

主题：请问上述代码错哪儿了？