我必须使用MessagePack来反序列化从Web API(ASP.net)返回的数据,该Web API使用相同的程序包进行了序列化。
使用以下代码
public async static Task<T> DeserializeAsync<T>(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream), "Stream value cannot be null");
}
stream.Position = 0;
T deserialized = await MessagePackSerializer.DeserializeAsync<T>(stream, MessagePack.Resolvers.ContractlessStandardResolver.Options).ConfigureAwait(false);
return deserialized;
}
在Android的调试模式下一切正常,但在iOS的调试和发行版以及Android发行模式下,一切正常。反序列化代码崩溃,但出现以下异常
Android -> Release
[MonoDroid] at MessagePa07-10 18:06:01.269 I/MonoDroid(13495): MessagePack.MessagePackSerializationException: Failed to deserialize Project.Core.Models.SomeData Class value. ---> System.TypeInitializationException: The type initializer for 'FormatterCache`1' threw an exception. ---> MessagePack.Internal.MessagePackDynamicObjectResolverException: can't find public constructor. type:System.Drawing.Drawing2D.Matrix
[MonoDroid] at MessagePack.Internal.ObjectSerializationInfo.CreateOrNull (System.Type type, System.Boolean forceStringKey, System.Boolean contractless, System.Boolean allowPrivate) [0x009a0] in <23c4c9b023514c20801c8f07fd69206c>:0
[MonoDroid] at MessagePack.Internal.DynamicObjectTypeBuilder.BuildType (MessagePack.Internal.DynamicAssembly assembly, System.Type type, System.Boolean forceStringKey, System.Boolean contractless) [0x00015] in <23c4c9b023514c20801c8f07fd69206c>:0
iOS->
System.TypeInitializationException: The type initializer for 'Project.Core.Helpers.BinarySerializer' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Resolvers.ContractlessStandardResolver' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Internal.StandardResolverHelper' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Resolvers.DynamicEnumResolver' threw an exception. ---> System.PlatformNotSupportedException: Operation is not supported on this platform.
at MessagePack.Internal.DynamicAssembly..ctor (System.String moduleName) [0x0001a] in <f04e2061de5c414991b8e36a20354820>:0
at MessagePack.Resolvers.DynamicEnumResolver..cctor () [0x00010] in <f04e2061de5c414991b8e36a20354820>:0
--- End of inner exception stack trace ---
at (wrapper managed-to-native) System.Object.__icall_wrapper_mono_generic_class_init(intptr)
at MessagePack.Internal.StandardResolverHelper..cctor () [0x00000] in <f04e2061de5c414991b8e36a20354820>:0
--- End of inner exception stack trace ---
在MessagePack git页面中找到该部分,指定使用提前时间代码生成器解决此问题的方法。我按照步骤操作,但无法解决问题。另外,我确定我做得对。
如何在Xamarin.Forms中使用MessagePack。任何人都可以建议我或提供参考。
更新后续步骤
Initialize
方法中使用了以下代码StaticCompositeResolver.Instance.Register(
MessagePack.Resolvers.GeneratedResolver.Instance,
MessagePack.Resolvers.StandardResolver.Instance
现在(平台不支持该操作)也会引发异常。我不太明白我在这里干什么。
更新2:
例外 MessagePackSerializerOptions
System.TypeInitializationException: The type initializer for 'MessagePackSerializerOptionsDefaultSettingsLazyInitializationHelper' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Resolvers.StandardResolver' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Internal.StandardResolverHelper' threw an exception. ---> System.TypeInitializationException: The type initializer for 'MessagePack.Resolvers.DynamicEnumResolver' threw an exception. ---> System.PlatformNotSupportedException: Operation is not supported on this platform.
at System.Reflection.Emit.AssemblyBuilder.DefineDynamicAssembly (System.Reflection.AssemblyName name, System.Reflection.Emit.AssemblyBuilderAccess access) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/mcs/class/corlib/System.Reflection.Emit/AssemblyBuilder.pns.cs:129
at MessagePack.Internal.DynamicAssembly..ctor (System.String moduleName) [0x0001a] in <f04e2061de5c414991b8e36a20354820>:0
at MessagePack.Resolvers.DynamicEnumResolver..cctor () [0x00010] in <f04e2061de5c414991b8e36a20354820>:0
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句