将代码移入命名空间后出现序列化异常

Question

我将我的 c++/cli (visual studio 2010) 项目的代码移到了命名空间中。在此之前，一切都在全局命名空间中，但这有几个需要解决的缺点。

重命名后，现有存档文件的二进制反序列化失败，错误信息如下：

Serialization Exception occurred.
The object with ID 11 was referenced in a fixup but does not exist.

为了解决类的重命名问题 - 现在驻留在命名空间中 - 我使用了 SerializationBinder。

ref class MySerializationBinder sealed: SerializationBinder
{
public:
    virtual Type^ BindToType (String^ assemblyname, String^ typeName) override
    {
        Type^ result = Type::GetType (typeName);
        if (result == nullptr)
        {
            result = Type::GetType ("MyNamespace." + typeName);
        }
        return result;
    }
};

有人知道这里可能出了什么问题吗？

Answer 1

将代码从 How to create a SerializationBinder for the Binary Formatter that handles the moving of types from one assembly and namespace to another 翻译成非常快速的 n 肮脏的 c++ cli，我们得到类似

的东西

virtual Type^ BindToType (String^ assemblyName, String^ typeName) override
{
    auto m = Regex::Match (typeName, "^(?<gen>[^\[]+)\[\[(?<type>[^\]]*)\](,\[(?<type>[^\]]*)\])*\]$");
    if (m->Success)
    {
        // generic type
        Type^ gen = GetFlatTypeMapping (assemblyName, m->Groups["gen"]->Value);
        List<Type^>^ genArgs = gcnew List<Type^> ();
        for each(Capture^ c in Enumerable::Cast<Capture^> (m->Groups["type"]->Captures)){
            Match^ m2 = Regex::Match (c->Value, "^(?<tname>.*)(?<aname>(,[^,]+){4})$");
            String^ tname = m2->Groups["tname"]->Value->Trim ();
            Type^ t = BindToType ("", tname);
            genArgs->Add(t);
        }
        return gen->MakeGenericType (genArgs->ToArray ());
    }
    return GetFlatTypeMapping (assemblyName, typeName);
}

Type^ GetFlatTypeMapping (String^ assemblyName, String^ typeName)
{
    Type^ result = Type::GetType (typeName);
    if (result == nullptr)
    {
        result = Type::GetType ("MyNamespace." + typeName);
    }
    if (result == nullptr)
    {
        if (typeName->Contains ("BindingList"))
            result = BindingList<int>::typeid->GetGenericTypeDefinition (); //int is just a placeholder
        if (typeName->Contains ("KeyValuePair"))
            result = KeyValuePair<int, int>::typeid->GetGenericTypeDefinition (); //int is just a placeholder
    }
    if (result == nullptr)
        throw gcnew Exception ("Fail");
    return result;
}

但是，由于我知道要翻译哪个类，所以我发现以下方法更容易。这样我们也不必关心嵌套泛型。假定变量 OldClassList 是一个字符串列表，其中包含必须移动到命名空间 MyNamespace.

中的类名

virtual Type^ BindToType (String^ assemblyName, String^ typeName) override
{
    String^ newTypeName = typeName;
    for each(String^ name in OldClassList)
        newTypeName = Regex::Replace (newTypeName, "(?<![.\w])" + name + "\b", "MyNamespace." + name);
    newTypeName = Regex::Replace (newTypeName, "\OldAssembly, Version", "NewAssembly, Version");

    Type^ result = Type::GetType (newTypeName);
    if (result == nullptr)
        throw gcnew Exception ("Could not parse the string {0} to a valid type."->Format(typeName));

    return result;
}

将代码移入命名空间后出现序列化异常

Serialization exception after moving code into namespace

.net

visual-c++

serialization

c++-cli

binaryformatter