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做excel插件开发，可能需要为excel添加自定义的工具栏。这个也是非常的简单的。
Public Class ConnectClass Connect
Implements Extensibility.IDTExtensibility2
Dim app As Excel.Application
Dim wb As Excel.Workbook
Dim ws As Excel.Worksheet
Dim addInInstance As Object
Dim pasteText As Microsoft.Office.Core.CommandBarButton ‘定义一个工具栏按钮
Public Sub OnBeginShutdown()Sub OnBeginShutdown(ByRef custom As System.Array) Implements Extensibility.IDTExtensibility2.OnBeginShutdown
End Sub
Public Sub OnAddInsUpdate()Sub OnAddInsUpdate(ByRef custom As System.Array) Implements Extensibility.IDTExtensibility2.OnAddInsUpdate
End Sub
Public Sub OnStartupComplete()Sub OnStartupComplete(ByRef custom As System.Array) Implements Extensibility.IDTExtensibility2.OnStartupComplete
End Sub
Public Sub OnDisconnection()Sub OnDisconnection(ByVal RemoveMode As Extensibility.ext_DisconnectMode, ByRef custom As System.Array)
Implements Extensibility.IDTExtensibility2.OnDisconnection
End Sub
Public Sub OnConnection()Sub OnConnection(ByVal application As Object, ByVal connectMode As Extensibility.ext_ConnectMode,
ByVal addInInst As Object, ByRef custom As System.Array)
Implements Extensibility.IDTExtensibility2.OnConnection
If TypeOf (application) Is Excel.Application Then app = CType(application, Excel.Application)
addInInstance = addInInst
wb = app.ActiveWorkbook
ws = CType(wb.ActiveSheet, Excel.Worksheet)
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