Protobuf.net＆QUOT;类型不能一个串行器已经产生与QUOT变更一次; [英] Protobuf.net "The type cannot be changed once a serializer has been generated"

问题描述

我在使用Protobuf.net，它抛出一个非常奇怪的除了一些相当简单的code。 在上线167，它抛出一个InvalidOperationException异常MetaType.cs的类型不能一次串行已经产生变化。这是什么意思，如何解决呢？

我的code是这样的：

此方法启动了所有的连载：

 而（的Parallel.For（0，100，（我）=＆GT！;
{
    部件w;
    锁定（F）{W = f.CreateWidget（）; }

    SerialiseWidget（瓦特）;

}）。IsCompleted）
{
    Thread.sleep代码（10）;
}
 

pretty的简单，它只是遍历所有的并行，串行化和100的部件。

本连载方法也pretty的简单：

 专用字节[] SerialiseWidget（部件w）
{
    使用（MemoryStream的M =新的MemoryStream（））
    {
        Serializer.Serialize＆LT; PacketChunk＆GT;（M，W）;

        返回m.ToArray（）;
    }
}
 

最后，Widget类看起来是这样的：

  [ProtoContract]
私有类的Widget
{
    [ProtoMember（1）]
    公众诠释一个;

    [ProtoMember（2）]
    公共字节[] B：

    [ProtoMember（3）]
    公共事℃; //事情本身就是一个protocontract

    [ProtoMember（4）]
    公众诠释D组;

    [ProtoMember（5）]
    公众诠释ê;
}
 

:我怀疑这可能是与事实，我在并行循环结束了。如何线程是Protobuf.net的那种事？

解决方案

  

如何线程是Protobuf.net的那种事？

那么，它发现了一些奇怪的事情发生：）

一个电话在某些时候theading（应用程序启动时是明显的点）之前，

只需添加到串行器。prepareSerializer，它应该原谅你......

编辑：思考它，有一个相当简单的变化，我可以做，以帮助特定的场景;我会调整，当我得到一个机会。此外，这应该只会影响的未发布的V2code（从SORCE code） - 在pre-内置DLL不受此AFAIK

I have some fairly simple code using Protobuf.net, which is throwing a very odd exception. In MetaType.cs on line 167 it throws a InvalidOperationException "The type cannot be changed once a serializer has been generated". What does this mean and how do I fix it?

My code looks like this:

This method starts off all the serialising:

while (!Parallel.For(0, 100, (i) =>
{
    Widget w;
    lock (f) { w = f.CreateWidget(); }

    SerialiseWidget(w);

}).IsCompleted)
{
    Thread.Sleep(10);
}

Pretty simple, it just loops through everything in Parallel, and serialises 100 widgets.

The serialise method is also pretty simple:

private byte[] SerialiseWidget(Widget w)
{
    using (MemoryStream m = new MemoryStream())
    {
        Serializer.Serialize<PacketChunk>(m, w);

        return m.ToArray();
    }
}

And finally, the widget class looks like this:

[ProtoContract]
private class Widget
{
    [ProtoMember(1)]
    public int a;

    [ProtoMember(2)]
    public byte[] b;

    [ProtoMember(3)]
    public Thing c; //Thing is itself a protocontract

    [ProtoMember(4)]
    public int d;

    [ProtoMember(5)]
    public int e;
}

Edit:: I suspect this may be to do with the fact I'm looping over in parallel. How threadsafe is Protobuf.net for that kind of thing?

解决方案

How threadsafe is Protobuf.net for that kind of thing?

Well, it noticed something odd happening :)

Just add a call to Serializer.PrepareSerializer at some point before the theading (app startup being the obvious point) and it should forgive you...

Edit: thinking about it, there is a fairly simple change I can make to help that specific scenario; I'll tweak that when I get a chance. Also, this should only affect the unreleased "v2" code (from sorce code) - the pre-built dll is not affected by this AFAIK.

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