解题思路：
把EXCEL看做数据源来连接。
用一个list来显示EXCEL中的所有表，选择指定表名，打开EXCEL到DG
——————————如下：
引用ADODB 2.8
导入：
Imports System.Data
Imports System.Data.Odbc
Imports System.Data.OleDb
申明
Private Excelpath As String
Public conn As New ADODB.Connection
Public rs As New ADODB.Recordset
创建conn
Public Sub connDB(ByVal filePath As String)
On Error Resume Next
Dim strConnString As String = "Provider=microsoft.ace.oledb.12.0;Data Source=" & filePath & ";Extended Properties='Excel 12.0; HDR=yes;IMEX=1';"
conn.ConnectionString = strConnString
conn.CursorLocation = ADODB.CursorLocationEnum.adUseClient
conn.Open()
End Sub
Public Function 获取电子表集合(filePath) As List(Of String)
Dim ConnStr As String = "Provider=microsoft.ace.oledb.12.0;Data Source=" & filePath & ";Extended Properties='Excel 12.0; HDR=no;IMEX=1';"
Dim list As New List(Of String)()
Dim Conn2 As New OleDbConnection(ConnStr)
Try
If Conn2.State = ConnectionState.Closed Then
Conn2.Open()
End If
Dim dt As DataTable = Conn2.GetSchema("Tables")
For Each row As DataRow In dt.Rows
If row(3).ToString() = "TABLE" Then
list.Add(row(2).ToString())
End If
Next
Catch e As Exception
'Throw e
Finally
If Conn2.State = ConnectionState.Open Then
Conn2.Close()
End If
Conn2.Dispose()
End Try
Return list
End Function
//////////////////
开始打开指定EXCEL到DG
Call connDB(Excelpath)
Dim sqlstr As String = "select * from [" & Me.ListBox1.Text & "]"
With rs
If rs.State <> 0 Then rs.Close()
.CursorLocation = ADODB.CursorLocationEnum.adUseClient
.Open(sqlstr, conn, ADODB.CursorTypeEnum.adOpenKeyset, ADODB.LockTypeEnum.adLockOptimistic)
If Not rs.EOF And Not rs.BOF Then
Dim da As New System.Data.OleDb.OleDbDataAdapter
Dim ds As New DataSet
da.Fill(ds, rs, "
注册表")
DG.DataSource = Nothing
DG.DataSource = ds.Tables(0)
DG.Refresh()
End If
End With