一个通用的Datagrid导出Excel打印的源函数
闲暇之余，写成函数，供新人研究学习



    'Power by：Landlordh
    '列宽默认为datagird的tablestyles(0)列宽的五分之一
    'G2E(dg1)


    Public Function G2E(ByVal dg As DataGrid)
        Dim dt As New DataTable
        Try
            dt = CType(dg.DataSource, DataTable)
        Catch ex As Exception
            MsgBox(ex.Message)
            Exit Function
        End Try
        Dim total_col As Integer = dt.Columns.Count
        Dim total_row As Integer = dt.Rows.Count
        If total_col < 1 Or total_row < 1 Then
            MsgBox("没有可供导入的数据!", MsgBoxStyle.Information, "系统提示")
            Exit Function
        End If

        'killEXCEL()

        '要先在引用中添加EXCEL组件
        Dim xlApp As New Excel.Application
        Dim xlBook As Excel.Workbook
        Dim xlSheet As Excel.Worksheet

        Try
            GC.Collect()
            xlBook = xlApp.Workbooks().Add
            xlSheet = xlBook.Worksheets("sheet1")
            xlApp.Visible = True

            Try
                With xlSheet.PageSetup
                    .RightMargin = 1
                    .LeftMargin = 1
                    .CenterHorizontally = True
                    .CenterHeader = "&24 报表"
                    .RightFooter = "&P of &N"
                End With
            Catch ex As Exception
                MsgBox(ex.ToString)
                Exit Function
            End Try

            Dim Col As Integer
            Dim Row As Integer
            Dim st_row As Integer = 5 '数据列头开始行,（列头）
            Dim trueCol As Integer = 0
            For Col = 0 To total_col - 1
                If dg.TableStyles.Item(0).GridColumnStyles.Item(Col).Width > 0 Then trueCol += 1
            Next

            Dim TitleArray(4, 0) As Object
            Dim HeaderArray(0, trueCol - 1) As Object
            Dim DataArray(total_row - 1, trueCol - 1) As Object

            TitleArray(0, 0) = "TO:"
            TitleArray(1, 0) = "FORM:"
            TitleArray(2, 0) = ""
            TitleArray(3, 0) = ""
            xlSheet.Range("A1").Resize(4, 1).Value = TitleArray

            Dim i As Integer = 0
            For Col = 0 To total_col - 1
                If dg.TableStyles.Item(0).GridColumnStyles.Item(Col).Width > 0 Then
                    i += 1
                    HeaderArray(0, i - 1) = dt.Columns(Col).ColumnName
                    '设列宽,默认为datagird列宽的五分之一
                    xlSheet.Cells(st_row, i).ColumnWidth = dg.TableStyles.Item(0).GridColumnStyles.Item(Col).Width / 5
                End If
            Next
            xlSheet.Range("A" & st_row).Resize(st_row, trueCol).Value = HeaderArray

            For Row = 0 To total_row - 1
                i = 0
                For Col = 0 To total_col - 1
                    If dg.TableStyles.Item(0).GridColumnStyles.Item(Col).Width > 0 Then
                        i += 1
                        DataArray(Row, i - 1) = dt.Rows(Row).Item(Col)
                    End If
                Next
            Next
            xlSheet.Range("A" & st_row + 1).Resize(total_row, trueCol).Value = DataArray

            With xlSheet
                .Range(.Cells(st_row, 1), .Cells(st_row, trueCol)).Font.Bold = True
                .Range(.Cells(st_row, 1), .Cells(st_row, trueCol)).HorizontalAlignment = 3
                .Range(.Cells(st_row, 1), .Cells(total_row + st_row, trueCol)).Borders.LineStyle = 1
                '设置数据区第一列到第二列为居中
                .Range(.Cells(st_row, 1), .Cells(total_row + st_row, 2)).HorizontalAlignment = 3
            End With

            xlApp.ActiveWorkbook.PrintPreview()
        Catch ex As Exception
            xlSheet = Nothing
            xlApp.DisplayAlerts = False
            xlBook.RunAutoMacros(Excel.XlRunAutoMacro.xlAutoClose)
            xlBook.Close()
            xlBook = Nothing
            xlApp.Quit()
            xlApp.DisplayAlerts = True
            xlApp = Nothing
            GC.Collect()
            MsgBox(ex.ToString)
            Exit Function
        End Try
      &n

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