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AppStateSerializer problem

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9094 Dec 5,2003 04:31 PM UTC Dec 8,2003 03:44 AM UTC Windows Forms 3
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Tags: Tools
Roland Martin
Asked On December 5, 2003 04:31 PM UTC

I am attempting to use AppStateSerializer to save/restore an object. I am using SerializeMode.XMLFile, the serialization works fine but DeserializeObject fails on line 817 of AppSerializer.cs. The source comments say the following: // The depersisted hashtable will contain a string representation of // the XML data. Convert the contents of the String into a bytearray // and deserialize the bytearray using a memorystream. In Visual Studio this is not true, the hashtable contains an already deserialized object, not a String version. The following fails: byte[] bytearray = encoding.GetBytes(ht[strname] as String); Additional information: String reference not set to an instance of a String. Is there anything I can do to fix this? Thanks - Roland

Gurucharan Patwal [Syncfusion]
Replied On December 5, 2003 08:22 PM UTC

Hi Roland, Please take a look at the sample in the folder - ..\Syncfusion\Essential Suite\Shared\Samples\AppStateSerializerDemo which shows how an AppStateSerializer could be used to save/load state information of a control on a form. Refer to this code snippet : AppStateSerializer.InitializeSingleton(SerializeMode.XMLFile, "GlobalState"); Here state information is persisted and loaded from a XMLFile name GlobalState. Please let us know what object (like ToolBars, docking windows etc.) are you referring to here, so that we could send you a specific sample that meets your requirements. Thanks for choosing Syncfusion products. Regards, Guru Patwal Syncfusion, Inc.

Roland Martin
Replied On December 6, 2003 12:10 AM UTC

I am attempting to serialize/deserialize my own object, not dockable window or toolbar state. The object has a few int members. Is the problem that AppStateSerializer only supports simple types and not complex objects? I can serialize/deserialize individual int/string/bool fine, I just cannot deserialize an object with multiple member variables.

Holger Persch
Replied On December 8, 2003 03:44 AM UTC

I have done this already in my project and everything works fine. I am serializing and deserializing a class with about 9 fields in a XML based file (SerializeMode.XMLFile) without any problems. The class contains some strings, bools and also a ArrayList. Regards, Holger

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