如何使用vb.net将datagridview导出到excel？

Question

我在vb.net中有一个datagridview,它从数据库中填充.我研究过,我发现没有内置的支持直接从datagridview打印.我不想使用水晶报告,因为我不熟悉它.

我打算将它导出到excel以使我能够从datagridview生成报告.

你能告诉我这样做的方法吗？

Answer 1

下面的代码创建Excel文件并将其保存在D:驱动器中它使用Microsoft Office 2007

首先将READ REIDRANCE(Microsoft Office 12.0对象库)添加到项目中

然后将下面给出的代码添加到导出按钮单击事件 -

Private Sub Export_Button_Click(ByVal sender As System.Object, ByVal e As 
System.EventArgs) Handles VIEW_Button.Click

    Dim xlApp As Microsoft.Office.Interop.Excel.Application
    Dim xlWorkBook As Microsoft.Office.Interop.Excel.Workbook
    Dim xlWorkSheet As Microsoft.Office.Interop.Excel.Worksheet
    Dim misValue As Object = System.Reflection.Missing.Value
    Dim i As Integer
    Dim j As Integer

    xlApp = New Microsoft.Office.Interop.Excel.ApplicationClass
    xlWorkBook = xlApp.Workbooks.Add(misValue)
    xlWorkSheet = xlWorkBook.Sheets("sheet1")


    For i = 0 To DataGridView1.RowCount - 2
        For j = 0 To DataGridView1.ColumnCount - 1
            For k As Integer = 1 To DataGridView1.Columns.Count
                xlWorkSheet.Cells(1, k) = DataGridView1.Columns(k - 1).HeaderText
                xlWorkSheet.Cells(i + 2, j + 1) = DataGridView1(j, i).Value.ToString()
            Next
        Next
    Next

    xlWorkSheet.SaveAs("D:\vbexcel.xlsx")
    xlWorkBook.Close()
    xlApp.Quit()

    releaseObject(xlApp)
    releaseObject(xlWorkBook)
    releaseObject(xlWorkSheet)

    MsgBox("You can find the file D:\vbexcel.xlsx")
End Sub

Private Sub releaseObject(ByVal obj As Object)
    Try
        System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
        obj = Nothing
    Catch ex As Exception
        obj = Nothing
    Finally
        GC.Collect()
    End Try
End Sub

Answer 2

Excel方法

这种方法与您将看到的许多方法不同.其他人使用循环来编写每个单元格并使用文本数据类型写入单元格.

该方法创建从一个对象数组DataTable或DataGridView,然后将写入所述阵列到Excel.这意味着我可以在没有循环的情况下写入Excel并保留数据类型.

我从我的库中提取了这个,我认为我改变了它只能使用这个代码,但可能需要更多的小调整.如果您收到错误,请告诉我,我会为您纠正错误.通常,我创建一个类的实例并调用这些方法.如果您想使用我的库,请使用此链接下载它,如果您需要帮助,请告诉我.
https://zomp.co/Files.aspx?ID=zExcel

将代码复制到解决方案后,您将使用它.

在按钮代码中添加此项并将名称更改为控件.

WriteDataGrid("Sheet1", grid)

要在导出后打开文件,请使用此行

System.Diagnostics.Process.Start("The location and filename of your file")

在该WriteArray方法中,您需要将保存工作簿的行更改为要保存的位置.将此作为参数添加可能是有意义的.

wb.SaveAs("C:\MyWorkbook.xlsx")

Public Function WriteArray(Sheet As String, ByRef ObjectArray As Object(,)) As String
    Try
        Dim xl As Excel.Application = New Excel.Application
        Dim wb As Excel.Workbook = xl.Workbooks.Add()
        Dim ws As Excel.Worksheet = wb.Worksheets.Add()
        ws.Name = Sheet
        Dim range As Excel.Range = ws.Range("A1").Resize(ObjectArray.GetLength(0), ObjectArray.GetLength(1))
        range.Value = ObjectArray

        range = ws.Range("A1").Resize(1, ObjectArray.GetLength(1) - 1)

        range.Interior.Color = RGB(0, 70, 132)  'Con-way Blue
        range.Font.Color = RGB(Drawing.Color.White.R, Drawing.Color.White.G, Drawing.Color.White.B)
        range.Font.Bold = True
        range.WrapText = True

        range.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter
        range.VerticalAlignment = Excel.XlVAlign.xlVAlignCenter

        range.Application.ActiveWindow.SplitColumn = 0
        range.Application.ActiveWindow.SplitRow = 1
        range.Application.ActiveWindow.FreezePanes = True

        wb.SaveAs("C:\MyWorkbook.xlsx")
        wb.CLose()
        xl.Quit()
        xl = Nothing
        wb = Nothing
        ws  = Nothing
        range = Nothing
        ReleaseComObject(xl)
        ReleaseComObject(wb)
        ReleaseComObject(ws)
        ReleaseComObject(range)

        Return ""
    Catch ex As Exception
        Return "WriteArray()" & Environment.NewLine & Environment.NewLine & ex.Message
    End Try
End Function

Public Function WriteDataGrid(SheetName As String, ByRef dt As DataGridView) As String
        Try
            Dim l(dt.Rows.Count + 1, dt.Columns.Count) As Object
            For c As Integer = 0 To dt.Columns.Count - 1
                l(0, c) = dt.Columns(c).HeaderText
            Next

            For r As Integer = 1 To dt.Rows.Count
                For c As Integer = 0 To dt.Columns.Count - 1
                    l(r, c) = dt.Rows(r - 1).Cells(c)
                Next
            Next

            Dim errors As String = WriteArray(SheetName, l)
            If errors <> "" Then
                Return errors
            End If

            Return ""
        Catch ex As Exception
            Return "WriteDataGrid()" & Environment.NewLine & Environment.NewLine & ex.Message
        End Try
    End Function


 Public Function WriteDataTable(SheetName As String, ByRef dt As DataTable) As String
        Try
            Dim l(dt.Rows.Count + 1, dt.Columns.Count) As Object
            For c As Integer = 0 To dt.Columns.Count - 1
                l(0, c) = dt.Columns(c).ColumnName
            Next

            For r As Integer = 1 To dt.Rows.Count
                For c As Integer = 0 To dt.Columns.Count - 1
                    l(r, c) = dt.Rows(r - 1).Item(c)
                Next
            Next

            Dim errors As String = WriteArray(SheetName, l)
            If errors <> "" Then
                Return errors
            End If

            Return ""
        Catch ex As Exception
            Return "WriteDataTable()" & Environment.NewLine & Environment.NewLine & ex.Message
        End Try
    End Function

我实际上不在我的数据库程序中使用这个方法,因为当你有很多行/列时它是一个很慢的方法.我改为从DataGridView创建一个CSV.使用Excel Automation写入Excel仅在需要格式化数据和单元格时才有用,否则应使用CSV.您可以使用图像后的代码进行CSV导出.

CSV方法

Private Sub DataGridToCSV(ByRef dt As DataGridView, Qualifier As String)  
        Dim TempDirectory As String = "A temp Directory"  
        System.IO.Directory.CreateDirectory(TempDirectory)
        Dim oWrite As System.IO.StreamWriter
        Dim file As String = System.IO.Path.GetRandomFileName & ".csv"
        oWrite = IO.File.CreateText(TempDirectory & "\" & file)

        Dim CSV As StringBuilder = New StringBuilder()

        Dim i As Integer = 1
        Dim CSVHeader As StringBuilder = New StringBuilder()
        For Each c As DataGridViewColumn In dt.Columns
            If i = 1 Then
                CSVHeader.Append(Qualifier & c.HeaderText.ToString() & Qualifier)
            Else
                CSVHeader.Append("," & Qualifier & c.HeaderText.ToString() & Qualifier)
            End If
            i += 1
        Next

        'CSV.AppendLine(CSVHeader.ToString())
        oWrite.WriteLine(CSVHeader.ToString())
        oWrite.Flush()

        For r As Integer = 0 To dt.Rows.Count - 1

            Dim CSVLine As StringBuilder = New StringBuilder()
            Dim s As String = ""
            For c As Integer = 0 To dt.Columns.Count - 1
                If c = 0 Then
                    'CSVLine.Append(Qualifier & gridResults.Rows(r).Cells(c).Value.ToString() & Qualifier)
                    s = s & Qualifier & gridResults.Rows(r).Cells(c).Value.ToString() & Qualifier
                Else
                    'CSVLine.Append("," & Qualifier & gridResults.Rows(r).Cells(c).Value.ToString() & Qualifier)
                    s = s & "," & Qualifier & gridResults.Rows(r).Cells(c).Value.ToString() & Qualifier
                End If

            Next
            oWrite.WriteLine(s)
            oWrite.Flush()
            'CSV.AppendLine(CSVLine.ToString())
            'CSVLine.Clear()
        Next

        'oWrite.Write(CSV.ToString())

        oWrite.Close()
        oWrite = Nothing    

        System.Diagnostics.Process.Start(TempDirectory & "\" & file)   

        GC.Collect()

    End Sub