生成以后，用vba处理下。

Dim Book As New XLS.Book(ProjectPath & "Attachments\\订单计划一览表.xls")
Dim fl As String = ProjectPath & "Reports\\订单计划一览表.xls"
Dim Sheet As XLS.Sheet = Book.Sheets(0) \'引用工作簿的第一个工作表
Book.Build() \'生成细节区

Book.Save(fl) \'保存工作簿

Dim App As New MSExcel.Application
Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open(fl)
Dim Ws As MSExcel.WorkSheet = Wb.WorkSheets(1)
Dim Rg As MSExcel.Range = Ws.UsedRange
Rg.WrapText = True
\'Rg.EntireColumn.AutoFit   \'自动调整列宽
Rg.EntireRow.AutoFit  \'自动调整行高
App.Visible = True

不可能影响你的样式。

如果你的单元格是合并的单元格要这样处理 http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=70571&replyID=485270&skin=1

限定范围即可。

Dim App As New MSExcel.Application
try
   
    Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open("d:\\工单.xls")
    Dim Ws = wb.WorkSheets(1)
    Dim rg As MSExcel.Range
Dim tempWs = wb.WorkSheets.Add
    Dim tempCell As MSExcel.Range = tempWs.Cells(1, 1)
    For Each rg In ws.UsedRange
        If rg.MergeCells AndAlso rg.address.contains("$I") AndAlso rg.MergeArea.Columns.count=4 Then
            Dim width As Double = 0
            Dim tempCol
            For Each tempcol In rg.MergeArea.Columns
                width = width + tempcol.ColumnWidth
            Next
            tempWs.Columns(1).WrapText = True
            tempWs.Columns(1).ColumnWidth = width
            tempWs.Columns(1).Font.Size = rg.Font.Size
            tempcell.Value = rg.Value
            tempcell.RowHeight = 0
            tempcell.EntireRow.Activate
            tempcell.EntireRow.AutoFit
            If (rg.RowHeight < tempcell.RowHeight) Then
                Dim tempHeight As Double
                Dim tempCount As Integer
                tempHeight = tempcell.RowHeight
                tempCount = rg.MergeArea.Rows.Count
                For Each addHeightRow As object In rg.MergeArea.Rows
                   
                    If (addHeightRow.RowHeight < tempHeight / tempCount) Then
                        addHeightRow.RowHeight = tempHeight / tempCount
                    End If
                    tempHeight = tempHeight - addHeightRow.RowHeight
                    tempCount = tempCount - 1
                Next
                rg.WrapText = True
            End If
        End If
    Next
    app.DisplayAlerts = False
    tempWs.Delete
    app.visible = True
catch ex As exception
    msgbox(ex.message)
    app.quit
End try