Protobuf.net＆QUOT;类型不能一个串行器已经产生与QUOT变更一次;

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

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

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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