IXMLWriter xmlWriter = new XMLWriterClass() Note the name given to the object, as well as the namespace which identify the object as an ArcObject. This is done by an XMLSerializer, which writes the object to the XMLStream. Use XMLWriter in order to serialize the ArcObject into an XMLStream. Implementing method PersistStreamHelp.Save()Ĭonvert ArcObjects types into a string.
#Istream net code#
The following code uses unsafe code since interface IStream requires usage of pointers and therefore only given in C#. Some class members should not be directly copied, for example window handles (hWnd), device contexts (hDC), file handles, and Graphical Device Interface (GDI).
See the link in the Related Information section below. In the case of ArcObjects, the solution is to use XMLSerialize in order to write the ArcObjects unmanaged class members into an xml stream, and then convert this stream into a simple string which is serializabe.Īll the code in this article are from the Implementing persistence sample. This means that all managed objects must support serialization and that unmanaged objects must be converted into a managed serializable type. The idea behind a helper class is that each object passed to it should eventually become serializeable. The solution is to write a helper static class with helper methods Save() and Load () to delegate the calls when implementing IPersistStream in an object. Writing this code as a part of the custom object can also be cumbersome and difficult to read and maintain. Save() and IPersistStream.Load() methods. This makes it a challenge to implement the IPersistStream. The reality is that the object has different types of class members, including both managed and unmanaged types, i.e., ArcObjects components. For objects that only have managed class members, use MemoryStream in conjunction with a BinaryFormatter, assuming that all of these members support serialization. NET, however each method is object type specific. There are several ways to convert objects into byte arrays in.
NET, the objects must be converted into a byte array. In order to use the structured stream given by these methods using.
#Istream net serial#
IPersistStream is a Microsoft interface which provides methods for saving and loading objects that use a simple serial stream for their storage needs. This class requires that the cloned object, or clonee, support IPersistStream. use an ObjectCopy class, which uses ObjectStream internally. To support cloning through serialization, temporarily save the object to an ObjectSteam and then duplicate the object by creating a new instance of the class and loading its properties from the temporary ObjectStream. This functionality is available by implementing the interface IPersistVariant. For example, a custom symbol or element needs to be saved with the map document and load when the map document is opened. When writing customized objects, many cases need to support serialization.
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