在VS2003中，如果要给ActiveX控件的图象属性赋值，需要调用VB6.ImageToPicture。因为VS2003把图象属性的类型处理为stdole.IPictureDisp对象，所以需要利用这个函数将System.Drawing.Image转换为stdole.IPictureDisp。如：
Dim bmp1 As New Bitmap(strm1)
Dim strm2 As System.IO.Stream = Me.GetType.Assembly.GetManifestResourceStream("PROP.CONSTRUC.bmp")
ChkList1.set_ItemImage(ChkList1.NewIndex, VB6.ImageToPicture(bmp1))
如果在VS2005 Beta 2下运行上面的代码会导致一个System.InvalidCastException异常。提示信息为：
Unable to cast COM object of type 'System.Drawing.Image' to class type ''. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.
不过这段信息并不能说明错误的真实原因。实际上这个异常是因为VS2005将ActiveX控件图象属性的类型处理为System.Drawing.Image，也就是说不再需要VB6.ImageToPicture的转换了。你可以将代码这样写：
Dim bmp1 As New Bitmap(strm1)
Dim strm2 As System.IO.Stream = Me.GetType.Assembly.GetManifestResourceStream("PROP.CONSTRUC.bmp")
ChkList1.set_ItemImage(ChkList1.NewIndex, bmp1)
Dim bmp1 As New Bitmap(strm1) Dim strm2 As System.IO.Stream = Me.GetType.Assembly.GetManifestResourceStream("PROP.CONSTRUC.bmp") ChkList1.set_ItemImage(ChkList1.NewIndex, VB6.ImageToPicture(bmp1))如果在VS2005 Beta 2下运行上面的代码会导致一个System.InvalidCastException异常。提示信息为：
Unable to cast COM object of type 'System.Drawing.Image' to class type ''. Instances of types that represent COM components cannot be cast to types that do not represent COM components; however they can be cast to interfaces as long as the underlying COM component supports QueryInterface calls for the IID of the interface.不过这段信息并不能说明错误的真实原因。实际上这个异常是因为VS2005将ActiveX控件图象属性的类型处理为System.Drawing.Image，也就是说不再需要VB6.ImageToPicture的转换了。你可以将代码这样写：
Dim bmp1 As New Bitmap(strm1) Dim strm2 As System.IO.Stream = Me.GetType.Assembly.GetManifestResourceStream("PROP.CONSTRUC.bmp") ChkList1.set_ItemImage(ChkList1.NewIndex, bmp1)