.NET 对实现IPersistStream接口的对象进行保存和读取

我们可以对实现IPersistStream接口的类的对象进行保存和读取，如Element，Map等等

以下为应用IPersistStream接口保存当前视图（Map）至文件和读取文件并在当前视图展示的代码

 

            //保存当前视图至文件

            IMemoryBlobStream pMemoryBlobStream = new MemoryBlobStreamClass();

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            pObjectStream.Stream = pMemoryBlobStream;

 

            IPersistStream pPersistStream = (IPersistStream)m_map;

            pPersistStream.Save((IStream)pObjectStream, 0);

            pMemoryBlobStream.SaveToFile(@"e:\myfile.blb");

 

 

            //读取文件并在当前视图展现

            IMemoryBlobStream pMemoryBlobStream = new MemoryBlobStreamClass();

            pMemoryBlobStream.LoadFromFile(@"e:\myfile.blb");

            IObjectStream pObjectStream = new ObjectStreamClass();

            pObjectStream.Stream=pMemoryBlobStream;

            IPersistStream pPersistStream = (IPersistStream)m_map;

            pPersistStream.Load((IStream)pObjectStream);

 

            m_activeView.Refresh();