利用VB.NET实现导出DataTable数据到excel中，各位大侠帮帮忙，最好有源码，谢谢，江湖救急

刚好写了个Helper类，你试验一下DataTable2Exce(这个方法代码如下：

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Imports System.IO

Imports System.Data

Imports System.Data.OleDb

Public MustInherit Class ExcelHelper

Private Shared Function buildConnStr(excelFilePath As String) As String

Dim excelFileInfo As New System.IO.FileInfo(excelFilePath)

Dim constr As String

If excelFileInfo.Extension = ".xlsx" Then

constr = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 12.0 Xml;HDR=YES;IMEX=1'", excelFilePath)

Else

constr = String.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1'", excelFilePath)

End If

Return constr

End Function

'将datatable导入到excel

Public Shared Function DataTable2Excel(dt As DataTable, excelFilePath As String) As Boolean

If File.Exists(excelFilePath) Then

Throw New Exception("该文件已经存在！")

End If

If dt.TableName.Trim.Length = 0 Or dt.TableName.ToLower = "table" Then

dt.TableName = "Sheet1"

End If

Dim colCount As Integer = dt.Columns.Count

Dim pa(colCount - 1) As OleDb.OleDbParameter

Dim tableStructStr As String = "Create Table " dt.TableName "("

Dim connString As String = buildConnStr(excelFilePath)

Dim objconn As New OleDbConnection(connString)

Dim objcmd As New OleDbCommand

objcmd.Connection = objconn

Dim dataTypeList As New ArrayList

dataTypeList.Add("System.Decimal")

dataTypeList.Add("System.Double")

dataTypeList.Add("System.Int16")

dataTypeList.Add("System.Int32")

dataTypeList.Add("System.Int64")

dataTypeList.Add("System.Single")

Dim i As Integer = 0

For Each col As DataColumn In dt.Columns

If dataTypeList.IndexOf(col.GetType.ToString) 0 Then

pa(i) = New OleDbParameter("@" col.ColumnName, OleDbType.Double)

objcmd.Parameters.Add(pa(i))

If i + 1 = colCount Then

tableStructStr += col.ColumnName + " double)"

Else

tableStructStr += col.ColumnName + " double,"

End If

Else

pa(i) = New OleDbParameter("@" col.ColumnName, OleDbType.VarChar)

objcmd.Parameters.Add(pa(i))

If i + 1 = colCount Then

tableStructStr += col.ColumnName + " VarChar)"

Else

tableStructStr += col.ColumnName + " VarChar,"

End If

End If

i += 1

Next

Try

objcmd.CommandText = tableStructStr

If objconn.State = ConnectionState.Closed Then objconn.Open()

objcmd.ExecuteNonQuery()

Catch ex As Exception

Throw ex

End Try

Dim InsertSql_1 As String = "Insert into " + dt.TableName + " ("

Dim InsertSql_2 As String = " Values ("

Dim InsertSql As String = ""

For colID As Integer = 0 To colCount - 1 Step 1

If colID + 1 = colCount Then

InsertSql_1 += dt.Columns(colID).ColumnName ")"

InsertSql_2 += "@" + dt.Columns(colID).ColumnName + ")"

Else

InsertSql_1 += dt.Columns(colID).ColumnName + ","

InsertSql_2 += "@" + dt.Columns(colID).ColumnName + ","

End If

Next

InsertSql = InsertSql_1 + InsertSql_2

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

For colID = 0 To dt.Columns.Count - 1

If pa(colID).DbType = DbType.Double And dt.Rows(rowID)(colID).ToString.Trim = "" Then

pa(colID).Value = 0

Else

pa(colID).Value = dt.Rows(rowID)(colID).ToString.Trim

End If

Next

Try

objcmd.CommandText = InsertSql

objcmd.ExecuteNonQuery()

Catch ex As Exception

Throw ex

End Try

Next

Try

If objconn.State = ConnectionState.Open Then objconn.Close()

Catch exp As Exception

Throw exp

End Try

Return True

End Function

' 获取Excel文件数据表列表Sheets

Public Shared Function GetExcelTables(ExcelFileName As String) As ArrayList

'Dim sheets As New List(Of String)

'conn.Open()

'Dim dt As DataTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, Nothing)

'For Each r In dt.Rows

' sheets.Add(r("TABLE_NAME"))

'Next

'conn.Close()

'Return sheets

Dim dt As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

Return Nothing

End If

Dim tableList As New ArrayList

Using conn As OleDbConnection = New OleDbConnection(buildConnStr(ExcelFileName))

Try

conn.Open()

dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, New Object() {Nothing, Nothing, Nothing, "TABLE"})

Catch ex As Exception

Throw ex

End Try

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

Dim tableName As String = dt.Rows(i)(2).ToString.Trim.TrimEnd("$")

If tableList.IndexOf(tableName) 0 Then tableList.Add(tableName)

Next

End Using

Return tableList

End Function

'将Excel文件导出至DataTable(第一行作为表头)

Public Shared Function InputFromExcel(ExcelFileName As String, TableName As String) As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

End If

Dim tableList As ArrayList = GetExcelTables(ExcelFileName)

If tableList.IndexOf(TableName) 0 Then

TableName = tableList(0).ToString.Trim

End If

Dim dt As New DataTable

Dim conn As New OleDbConnection(buildConnStr(ExcelFileName))

Dim cmd As New OleDbCommand("select * from [" TableName "$]", conn) '调试是否需要$

Dim adapter As New OleDbDataAdapter(cmd)

Try

If conn.State = ConnectionState.Closed Then conn.Open()

adapter.Fill(dt)

Catch ex As Exception

Throw ex

Finally

If conn.State = ConnectionState.Open Then conn.Close()

End Try

Return dt

End Function

'查询excel文件中的一个数据

Public Shared Function ReadOneDataFromExcel(ExcelFileName As String, TableName As String, sql As String) As Object

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

End If

Dim tableList As ArrayList = GetExcelTables(ExcelFileName)

If tableList.IndexOf(TableName) 0 Then

TableName = tableList(0).ToString.Trim

End If

Dim dt As New DataTable

Dim conn As New OleDbConnection(buildConnStr(ExcelFileName))

Dim cmd As New OleDbCommand(sql, conn) '调试是否需要$

Dim ret As Object

Try

If conn.State = ConnectionState.Closed Then conn.Open()

ret = cmd.ExecuteScalar()

Catch ex As Exception

Throw ex

Finally

If conn.State = ConnectionState.Open Then conn.Close()

End Try

Return ret

End Function

'获取Excel文件指定数据表的数据列表columnNames

Public Shared Function GetExcelTableColumns(ExcelFileName As String, TableName As String) As ArrayList

Dim dt As DataTable

If Not File.Exists(ExcelFileName) Then

Throw New Exception("指定的Excel文件不存在")

Return Nothing

End If

Dim ColList As New ArrayList

Using conn As OleDbConnection = New OleDbConnection(buildConnStr(ExcelFileName))

Try

conn.Open()

dt = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Columns, New Object() {Nothing, Nothing, TableName, Nothing})

Catch ex As Exception

Throw ex

End Try

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

Dim ColName = dt.Rows(i)("Column_Name").ToString().Trim()

ColList.Add(ColName)

Next

End Using

Return ColList

End Function

End Class

vb.net 输出 excel

这里有段VB6.0的，你可以参考。

注意添加引用。

Private Sub Command6_Click()

Dim i, j As Integer

Dim xlApplication As Excel.Application, xlWorkbook As Excel.Workbook, xlSheet

Dim xlApp As Excel.Application

On Error Resume Next

Set xlApplication = GetObject(, "Excel.Application")

Set xlApp = CreateObject("Excel.Application")

If MsgBox("确认将文件信息导出到EXCEL中？�", vbExclamation + vbYesNo, "警告") = vbYes Then

If Err.Number 0 Then Set xlApplication = CreateObject("Excel.Application")

Set xlWorkbook = xlApplication.Workbooks.Add

Set xlSheet = xlWorkbook.ActiveSheet

xlSheet.Cells(1, 2) = lblcl.Caption

xlSheet.Range("A1:E1").MergeCells = True

xlSheet.Range("A1:E1").HorizontalAlignment = xlCenter

xlSheet.Cells(2, 2).ColumnWidth = 18

For i = 1 To DataGrid1.Columns.Count

xlSheet.Cells(2, 1) = "编号"

xlSheet.Cells(2, i + 1) = DataGrid1.Columns(i).Caption

For j = 0 To DataGrid1.VisibleRows - 1

xlSheet.Cells(j + 3, 1) = j + 1

xlSheet.Cells(j + 3, i + 1) = DataGrid1.Columns(i).CellText(DataGrid1.RowBookmark(j))

Next j

Next i

xlApplication.Visible = True

Set xlSheet = Nothing

Set xlWorkbook = Nothing

Set xlApplication = Nothing

'xlApp.Range("A2:L2").Columns.Interior.ColorIndex = 40

'xlApp.Range("A2:L2").Borders.LineStyle = xlContinuous

'xlApp.Visible = True

'xlApp.Range(xlSheet.Cells(2 + PartsRs.RecordCount + 1, 1), xlSheet.Cells(2 + PartsRs.RecordCount + 1, 8)).Columns.Interior.ColorIndex = 40

'xlApp.Range(xlSheet.Cells(2 + PartsRs.RecordCount + 1, 1), xlSheet.Cells(2 + PartsRs.RecordCount + 1, 8)).Borders.LineStyle = xlContinuous

Else

MsgBox "无信息可供您导出，请确认!", vbExclamation + vbOKOnly, "警告"

End If

End Sub

VB.net中把datagridview中的数据导出到电子表格，表格导出后出现"未将对象引用设置到对象的实例。

以下是我以前百度找的资料 希望对你有用 你读取DataGridView到DataGrid然后直接调用函数即可

Public Function ExportXLsD(ByVal datagrid As DataGrid) ', ByVal Title As String)

'Dim Mytable As New DataTable

'Mytable = CType(datagrid.DataSource, DataTable)

If mytable Is Nothing Then

MessageBox.Show("没有记录不能导出数据", "PurpleStar", MessageBoxButtons.OK, MessageBoxIcon.Information)

Exit Function

End If

If mytable.Rows.Count 0 Then

Dim MyFileName As String

Dim FileName As String

With SaveFileDialog1

.AddExtension = True '如果用户忘记添加扩展名，将自动家上

.DefaultExt = "xls" '默认扩展名

.Filter = "Excel文件(*.xls)|*.xls"

.Title = "文件保存到"

If .ShowDialog = DialogResult.OK Then

FileName = .FileName

End If

End With

MyFileName = Microsoft.VisualBasic.Right(FileName, 4)

If MyFileName = "" Then

Exit Function

End If

If MyFileName = ".xls" Or MyFileName = ".XLS" Then

Dim FS As FileStream = New FileStream(FileName, FileMode.Create)

Dim sw As StreamWriter = New StreamWriter(FS, System.Text.Encoding.Default)

sw.WriteLine(vbTab FileName vbTab Date.Now)

Dim i, j As Integer

Dim str As String = ""

For i = 0 To mytable.Columns.Count - 1

str = mytable.Columns(i).Caption

sw.Write(str vbTab)

Next

sw.Write(vbCrLf)

For j = 0 To mytable.Rows.Count - 1

For i = 0 To mytable.Columns.Count - 1

Dim strColName, strRow As String

strRow = IIf(mytable.Rows(j).Item(i) Is DBNull.Value, "", mytable.Rows(j).Item(i))

sw.Write(strRow vbTab)

Next

sw.Write(vbLf)

Next

sw.Close()

FS.Close()

MessageBox.Show("数据导出成功！", "PurpleStar", MessageBoxButtons.OK, MessageBoxIcon.Information)

Else

Exit Function

End If

Else

MessageBox.Show("没有记录不能导出数据", "PurpleStar", MessageBoxButtons.OK, MessageBoxIcon.Information)

End If

End Function

Private Sub OK_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_Button.Click

Dim saveExcel As SaveFileDialog

saveExcel = New SaveFileDialog

saveExcel.Filter = "Excel文件(.xls)|*.xls"

Dim filename As String

If saveExcel.ShowDialog = Windows.Forms.DialogResult.Cancel Then Exit Sub

filename = saveExcel.FileName

Dim excel As Excel.Application

excel = New Excel.Application

excel.DisplayAlerts = False

excel.Workbooks.Add(True)

excel.Visible = False

Dim i As Integer

For i = 0 To DataGridView1.Columns.Count - 1

excel.Cells(1, i + 1) = DataGridView1.Columns(i).HeaderText

Next

'设置标题

Dim j As Integer

For i = 0 To DataGridView1.Rows.Count - 1 '填充数据

For j = 0 To DataGridView1.Columns.Count - 1

excel.Cells(i + 2, j + 1) = DataGridView1(j, i).Value

Next

Next

excel.Workbooks(1).SaveCopyAs(filename) '保存

Me.Close()

End Sub

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