Question

我正在创建一个联网的应用程序。为此，我正在创建一个消息传递系统。到目前为止我得到了什么（至少是一个片段......）

public static byte[] ClassToBytes(GenericMessage Data)
{
    int Size = Marshal.SizeOf(Data);
    byte[] Buffer = new byte[Size];
    IntPtr Ptr = Marshal.AllocHGlobal(Size);

    Marshal.StructureToPtr(Data, Ptr, true);
    Marshal.Copy(Ptr, Buffer, 0, Size);
    Marshal.FreeHGlobal(Ptr);

    return Buffer;
}

public static GenericMessage BytesToClass(byte[] Source, ClassType Type)
{
    switch (Type) //This is going to be extended
    {
        case ClassType.GenericMessage:
            return BytesToClass<GenericMessage>(Source);
            break;
        case ClassType.RequestMessage: //RequestMessage is derived from GenericMessage
            return BytesToClass<RequestMessage>(Source);
            break;
        case ClassType.ResponseMessage: //ResponseMessage is derived from GenericMessage
            return BytesToClass<ResponseMessage>(Source);
            break;
        default:
            throw new KeyNotFoundException();
            break;
    }
}

public static T BytesToClass<T>(byte[] Source)
{
    int Size = Marshal.SizeOf(typeof(T));
    IntPtr Ptr = Marshal.AllocHGlobal(Size);
    Marshal.Copy(Source, 0, Ptr, Size);
    T result = (T)Marshal.PtrToStructure(Ptr, typeof(T));
    Marshal.FreeHGlobal(Ptr);
    return result;
}

基本上我想做的是：

public static GenericMessage BytesToClass(byte[] Source, ClassType Type)
{
    return BytesToClass<Type>(Source);  
}

是否有这样的方式使用枚举，或者字典？

我已经尝试过，但没有任何结果。

Answer 1

如果你想动态提供泛型类型，就像评论中评论的@usr一样，你可以这样做：

    public static GenericMessage BytesToClass(byte[] Source, ClassType MyType)
    {
        // Gets the Type we want to convert the Source byte array to from the Enum 
        Type _targetType = typeof(Program).GetNestedType(MyType.ToString());
        // Gets the generic convertion method, note we have to give it the exact parameters as there are 2 methods with the same name
        var _convMethod = typeof(Program).GetMethod("BytesToClass", new Type[] { typeof(byte[]) });
        // Invoke the generic method, setting T as _targetType
        var result = _convMethod.MakeGenericMethod(new Type[] { _targetType }).Invoke(null, new object[] { Source });
        return (GenericMessage)result;
    }

ClassType enum成员的名称必须与他们所代表的类名完全相同。此外，此方法假定您要将字节数组转换为的类在Program类中（请参阅typeof(Program)）。显然你应该改变它以使它适用于你的程序。

将枚举值连接到方法组的优雅方法

1 个答案: