在我的一个。net标准dll中也有类似的问题。

我使用了Microsoft.XmlSerializer.Generator nuget，它可以在. net Core和. net Standard上预生成XmlSerializer。

XmlSerializer函数。FromTypes不会抛出异常，但它会泄漏内存。这就是为什么你需要为每个类型缓存这样的序列化器，以避免内存泄漏为每个创建的实例。

创建自己的XmlSerializer工厂并简单地使用它:

XmlSerializer serializer = XmlSerializerFactoryNoThrow.Create(typeof(MyType));

工厂是这样的:

public static class XmlSerializerFactoryNoThrow
{
    public static Dictionary<Type, XmlSerializer> _cache = new Dictionary<Type, XmlSerializer>();

    private static object SyncRootCache = new object();        

    /// <summary>
    /// //the constructor XmlSerializer.FromTypes does not throw exception, but it is said that it causes memory leaks
    /// http://stackoverflow.com/questions/1127431/xmlserializer-giving-filenotfoundexception-at-constructor
    /// That is why I use dictionary to cache the serializers my self.
    /// </summary>
    public static XmlSerializer Create(Type type)
    {
        XmlSerializer serializer;

        lock (SyncRootCache)
        {
            if (_cache.TryGetValue(type, out serializer))
                return serializer;
        }

        lock (type) //multiple variable of type of one type is same instance
        {
            //constructor XmlSerializer.FromTypes does not throw the first chance exception           
            serializer = XmlSerializer.FromTypes(new[] { type })[0];
            //serializer = XmlSerializerFactoryNoThrow.Create(type);
        }

        lock (SyncRootCache)
        {
            _cache[type] = serializer;
        }
        return serializer;
    }       
}

更复杂的版本，没有内存泄漏的可能性(请有人检查代码):

    public static XmlSerializer Create(Type type)
    {
        XmlSerializer serializer;

        lock (SyncRootCache)
        {
            if (_cache.TryGetValue(type, out serializer))
                return serializer;
        }

        lock (type) //multiple variable of type of one type is same instance
        {
            lock (SyncRootCache)
            {
                if (_cache.TryGetValue(type, out serializer))
                    return serializer;
            }
            serializer = XmlSerializer.FromTypes(new[] { type })[0];
            lock (SyncRootCache)
            {
                _cache[type] = serializer;
            }
        }          
        return serializer;
    }       
}

另一方面，对编译错误进行故障排除是非常复杂的。这些问题在FileNotFoundException异常中显示，并显示如下信息:

File or assembly name abcdef.dll, or one of its dependencies, was not found. File name: "abcdef.dll"
   at System.Reflection.Assembly.nLoad( ... )
   at System.Reflection.Assembly.InternalLoad( ... )
   at System.Reflection.Assembly.Load(...)
   at System.CodeDom.Compiler.CompilerResults.get_CompiledAssembly() 

You may wonder what a file not found exception has to do with instantiating a serializer object, but remember: the constructor writes C# files and tries to compile them. The call stack of this exception provides some good information to support that suspicion. The exception occurred while the XmlSerializer attempted to load an assembly generated by CodeDOM calling the System.Reflection.Assembly.Load method. The exception does not provide an explanation as to why the assembly that the XmlSerializer was supposed to create was not present. In general, the assembly is not present because the compilation failed, which may happen because, under rare circumstances, the serialization attributes produce code that the C# compiler fails to compile.

请注意 当XmlSerializer在不能访问临时目录的帐户或安全环境下运行时，也会发生此错误。

来源: http://msdn.microsoft.com/en-us/library/aa302290.aspx

在Visual Studio项目属性(“Build”页面，如果我没记错的话)中有一个选项显示“生成序列化程序集”。尝试为生成[包含MyType的程序集]的项目打开该选项。

在我的一个。net标准dll中也有类似的问题。

我使用了Microsoft.XmlSerializer.Generator nuget，它可以在. net Core和. net Standard上预生成XmlSerializer。

为了避免异常，你需要做两件事:

向序列化类添加属性(我希望您有访问权限) 使用sgen.exe生成序列化文件

将System.Xml.Serialization.XmlSerializerAssembly属性添加到类中。 将'MyAssembly'替换为MyClass所在程序集的名称。

[Serializable]
[XmlSerializerAssembly("MyAssembly.XmlSerializers")]
public class MyClass
{
…
}

使用sgen.exe实用程序生成序列化文件，并将其与类的程序集一起部署。

' sgen.exe MyAssembly.dll '将生成文件myassembly . xmlserializer .dll

这两个更改将导致.net直接查找程序集。 我检查了一下，它在。net框架3.5和Visual Studio 2008上工作