我一直在使用的一个应用程序在尝试序列化类型时失败了。
像这样的陈述
XmlSerializer lizer = new XmlSerializer(typeof(MyType));
生产:
System.IO.FileNotFoundException occurred
Message="Could not load file or assembly '[Containing Assembly of MyType].XmlSerializers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified."
Source="mscorlib"
FileName="[Containing Assembly of MyType].XmlSerializers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"
FusionLog=""
StackTrace:
at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
我没有为我的类定义任何特殊的序列化器。
我该如何解决这个问题?
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
看到过很多使用ConcurrentDictionary的建议,但没有可靠的例子,所以我将全身心投入到这个解决方案竞赛中。我不是一个线程安全的开发人员,所以如果这段代码不可靠,请为那些跟随的人说出来。
public static class XmlSerializerHelper
{
private static readonly ConcurrentDictionary<Type, XmlSerializer> TypeSerializers = new ConcurrentDictionary<Type, XmlSerializer>();
public static XmlSerializer GetSerializer(Type type)
{
return TypeSerializers.GetOrAdd(type,
t =>
{
var importer = new XmlReflectionImporter();
var mapping = importer.ImportTypeMapping(t, null, null);
return new XmlSerializer(mapping);
});
}
}
我看过其他关于ConcurrentDictionary和Lazy加载值的文章。我不确定这是否与此相关,但这里是它的代码:
private static readonly ConcurrentDictionary<Type, Lazy<XmlSerializer>> TypeSerializers = new ConcurrentDictionary<Type, Lazy<XmlSerializer>>();
public static XmlSerializer GetSerializer(Type type)
{
return TypeSerializers.GetOrAdd(type,
t =>
{
var importer = new XmlReflectionImporter();
var mapping = importer.ImportTypeMapping(t, null, null);
var lazyResult = new Lazy<XmlSerializer>(() => new XmlSerializer(mapping), LazyThreadSafetyMode.ExecutionAndPublication);
return lazyResult;
}).Value;
}