Can't deserialize with binaryFormatter after changing namespace of class [duplicate]

问题

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duplicated id with fragment (3 answers)

Is it possible to recover an object serialized via “BinaryFormatter” after changing class names? (1 answer)

Closed 5 years ago.

After changing the namespace of my class I can no longer deserialize the objects. I've implemented SerializationBinder. Example:

public class TypeNameConverter : SerializationBinder
{
    public override Type BindToType(string assemblyName, string typeName)
    {
        typeName = typeName.Replace("MyOldNamespace", "MyNewNamespace");
        return Type.GetType(string.Format("{0}, {1}", typeName, assemblyName));
    }
}

BinaryFormatter bf = new BinaryFormatter();
bf.Binder = new TypeNameConverter();

The exception I get is:

'System.Runtime.Serialization.TypeLoadExceptionHolder' cannot be converted to type 'MyNewNamespace.MyClass'

回答1:

you forgot to replace the assembly name:

class TypeNameConverter : SerializationBinder
{
    public override Type BindToType(string assemblyName, string typeName)
    {
        typeName = typeName.Replace("MyOldNamespace", "MyNewNamespace");
        assemblyName = assemblyName.Replace("MyOldNamespace", "MyNewNamespace");
        return Type.GetType(string.Format("{0}, {1}", typeName, assemblyName));
    }
}

来源：https://stackoverflow.com/questions/12737602/cant-deserialize-with-binaryformatter-after-changing-namespace-of-class