vb.net 2010/2008 导出到excel,无需引用

这是网上的一个在Vb.net中将数据库中的数据导出到Excel的例子，经过了小小的修改，这种方法的好处是不需要另外的引用，代码如下：

ASP/Visual Basic Code复制内容到剪贴板

Dim Mytable As DataTable = myDataSet("select * from JL").Tables(0)
'红色的是自定函数，可见最下面代码

If Mytable Is Nothing Then
MessageBox.Show("没有记录不能导出数据", "导出提示", MessageBoxButtons.OK, MessageBoxIcon.Information)
Exit Sub
End If
Dim SaveFileDialog As FileDialog = New SaveFileDialog
If Mytable.Rows.Count > 0 Then
Dim MyFileName As String
Dim FileName As String = ""
With SaveFileDialog
.AddExtension = True '如果用户忘记添加扩展名，将自动加上
.DefaultExt = "xls" '默认扩展名
.Filter = "Excel文件(*.xls)|*.xls"
.Title = "文件保存到"
If .ShowDialog = Windows.Forms.DialogResult.OK Then
FileName = .FileName
End If
End With
MyFileName = Microsoft.VisualBasic.Right(FileName, 4)
If MyFileName = "" Then
Exit Sub
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 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(vbCrLf)
Next
sw.Close()
fs.Close()
MessageBox.Show("数据导出成功！", "导出提示", MessageBoxButtons.OK, MessageBoxIcon.Information)
Else
Exit Sub
End If
Else
MessageBox.Show("没有记录不能导出数据", "导出提示", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If

折叠C/C++ Code复制内容到剪贴板

Public Function myDataSet(ByVal SQLStr As String) As DataSet
dbName = My.Settings.dbNamer

Try
ConnStr = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Application.StartupPath & "\" & dbName & ".mdb"
Conn = New OleDbConnection(ConnStr)
Conn.Open()
Dim da As OleDbDataAdapter = New OleDbDataAdapter(SQLStr, Conn)
Dim ds As DataSet = New DataSet
da.Fill(ds)
Return ds
Catch ex As Exception
MsgBox(ex.Message.ToString, MsgBoxStyle.Information, "提示")
' MsgBox("请检查数据库名称是否正确！！", MsgBoxStyle.Information, "找不到数据库")
'frmSet.txtDbName.Text = "data2003"
dbName = My.Settings.dbNamer = "site"
'frmMain.toolReReadData.PerformClick()
' frmSet.Show()
Finally
Conn.Close()
End Try
Return Nothing '为去无返回警告
End Function