SoapFormatter.Deserialise cannot read a Font object?

[Philip K]

I was trying to use Soap serialisation to save some systems settings
how ever it fails if the settings contain a Font object, works fine if
the Font object is not in the object being serialised.

Font is marked [Serializable()] in the MS documentation.

Exception has been thrown by the target of an invocation.

at System.Reflection.RuntimeConstructorInfo.Serializa tionInvoke(Object
target, SerializationInfo info, StreamingContext context)
at
System.Runtime.Serialization.ObjectManager.Complet eISerializableObject(Object
obj, SerializationInfo info, StreamingContext context)
at
System.Runtime.Serialization.ObjectManager.FixupSp ecialObject(ObjectHolder
holder)\r\n at System.Runtime.Serialization.ObjectManager.DoFixup s()
at
System.Runtime.Serialization.Formatters.Soap.Objec tReader.Deserialize(HeaderHandler handler, ISerParser serParser)
at
System.Runtime.Serialization.Formatters.Soap.SoapF ormatter.Deserialize(Stream
serializationStream, HeaderHandler handler)
at
System.Runtime.Serialization.Formatters.Soap.SoapF ormatter.Deserialize(Stream
serializationStream)
at MiTekAUS.mi2020mn.JigViewSettings.Load() in
c:\\mi2020mn\\mi2020mn\\jigviewsettings.cs:line 133

[mridey]

Use a surrogate to Serialize and Deserialize the Font class yourself.

public class SoapFormatterEx : IFormatter
{
private SoapFormatter _formatter;

public SoapFormatterEx()
{
// 1. Create an instance of a Soap Formatter.
_formatter = new SoapFormatter();

// 2. Construct a SurrogateSelector object
SurrogateSelector ss = new SurrogateSelector();

// 3. Construct an instance of our serialization surrogate type
FontSurrogate vss = new FontSurrogate();

// 4. Tell the surrogate selector to use our object when a
// Font object is serialized/deserialized.
ss.AddSurrogate(typeof(System.Drawing.Font),
new StreamingContext(StreamingContextStates.All), vss);

// 5. Have the formatter use our surrogate selector
_formatter.SurrogateSelector = ss;
}

#region IFormatter Members

public void Serialize(System.IO.Stream serializationStream, object
graph)
{
_formatter.Serialize(serializationStream,graph);
}

public SerializationBinder Binder
{
get { return _formatter.Binder; }
set { _formatter.Binder = value; }
}

public StreamingContext Context
{
get { return _formatter.Context; }
set { _formatter.Context = value; }
}

public ISurrogateSelector SurrogateSelector
{
get { return _formatter.SurrogateSelector; }
set { _formatter.SurrogateSelector = value; }
}

public object Deserialize(System.IO.Stream serializationStream)
{
return _formatter.Deserialize(serializationStream);
}

#endregion

#region FontSurrogate class

private class FontSurrogate : ISerializationSurrogate
{
public void GetObjectData(object obj, SerializationInfo info,
StreamingContext context)
{
Font font = obj as Font;
FontConverter fc = new FontConverter();
info.AddValue("Encoded",fc.ConvertToString(font));
}

public object SetObjectData(object obj, SerializationInfo info,
StreamingContext context, ISurrogateSelector selector)
{
FontConverter fc = new FontConverter();
return fc.ConvertFromString(info.GetString("Encoded"));
}
}

#endregion
}

--
mridey
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