问题描述
当我尝试打开我的自定义可视化工具 在 .NET Core 项目(面向 2.2)中的表达式树上,出现以下异常:
When I try to open my custom visualizer on an expression tree in a .NET Core project (targeting 2.2), I get the following exception:
正在调试的进程中的自定义可视化组件抛出了类型为System.TypeLoadException"的未处理异常.
无法从程序集 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' 加载类型 'System.Runtime.CompilerServices.IsReadOnlyAttribute'.
Could not load type 'System.Runtime.CompilerServices.IsReadOnlyAttribute' from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.
以下代码(来自问题末尾的堆栈跟踪)似乎存在相同的问题:
The following code (derived from the stack trace, at the end of the question) appears to have the same issue:
// using System;
// using System.IO;
// using System.Runtime.Serialization.Formatters.Binary;
var stream = File.Create(Path.GetTempFileName());
var formatter = new BinaryFormatter();
var data = new VisualizerData(expr); // serialized class with information about a given expression tree
formatter.Serialize(stream, data); // fails with the same exception
当代码在 .NET Core 项目中运行,但使用来自引用的 .NET Framework 程序集(面向 4.7.2)的类 (VisualizerData
) 时;该程序集引用了 WPF 程序集.
when the code is running in a .NET Core project, but uses a class (VisualizerData
) from a referenced .NET Framework assembly (targeting 4.7.2); that assembly has references to WPF assemblies.
我该如何调试这个问题?可能是什么原因造成的?
请注意,这里没有进行任何反序列化;这就是启动序列化的全部过程.
Note that there isn't any deserialization going on here; this is all while starting up serialization.
VisualizerDataObjectSource.TransferData 的源代码VisualizerDataObjectSource.cs:line 9
堆栈跟踪:
at System.ModuleHandle.ResolveType(RuntimeModule module, Int32 typeToken, IntPtr* typeInstArgs, Int32 typeInstCount, IntPtr* methodInstArgs, Int32 methodInstCount, ObjectHandleOnStack type)
at System.ModuleHandle.ResolveTypeHandleInternal(RuntimeModule module, Int32 typeToken, RuntimeTypeHandle[] typeInstantiationContext, RuntimeTypeHandle[] methodInstantiationContext)
at System.Reflection.RuntimeModule.ResolveType(Int32 metadataToken, Type[] genericTypeArguments, Type[] genericMethodArguments)
at System.Reflection.CustomAttribute.FilterCustomAttributeRecord(CustomAttributeRecord caRecord, MetadataImport scope, Assembly& lastAptcaOkAssembly, RuntimeModule decoratedModule, MetadataToken decoratedToken, RuntimeType attributeFilterType, Boolean mustBeInheritable, Object[] attributes, IList derivedAttributes, RuntimeType& attributeType, IRuntimeMethodInfo& ctor, Boolean& ctorHasParameters, Boolean& isVarArg)
at System.Reflection.CustomAttribute.IsCustomAttributeDefined(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, RuntimeType attributeFilterType, Int32 attributeCtorToken, Boolean mustBeInheritable)
at System.Reflection.CustomAttribute.IsDefined(RuntimeMethodInfo method, RuntimeType caType, Boolean inherit)
at System.Runtime.Serialization.SerializationEvents.GetMethodsWithAttribute(Type attribute, Type t)
at System.Runtime.Serialization.SerializationEvents..ctor(Type t)
at System.Runtime.Serialization.SerializationEventsCache.<>c.<GetSerializationEventsForType>b__1_0(Type type)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at System.Runtime.Serialization.SerializationEventsCache.GetSerializationEventsForType(Type t)
at System.Runtime.Serialization.SerializationObjectManager.RegisterObject(Object obj)
at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.WriteArrayMember(WriteObjectInfo objectInfo, NameInfo arrayElemTypeNameInfo, Object data)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.WriteArray(WriteObjectInfo objectInfo, NameInfo memberNameInfo, WriteObjectInfo memberObjectInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Write(WriteObjectInfo objectInfo, NameInfo memberNameInfo, NameInfo typeNameInfo)
at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, BinaryFormatterWriter serWriter, Boolean fCheck)
at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Boolean check)
at ExpressionTreeVisualizer.VisualizerDataObjectSource.TransferData(Object target, Stream incomingData, Stream outgoingData) in C:UsersSpitzsource
eposzspitzExpressionToStringVisualizer.SharedVisualizerDataObjectSource.cs:line 9
at Microsoft.VisualStudio.DebuggerVisualizers.DebuggeeSide.Impl.ClrCustomVisualizerDebuggeeHost.TransferData(Object visualizedObject, Byte[] uiSideData)
推荐答案
似乎序列化在引用的 .NET Framework 程序集中定义的值类型是问题的根源.
It appears that serializing a value type defined in the referenced .NET Framework assembly is at the root of the problem.
使用以下方法:
static (bool success, string failPath, string errorMessage) CanSerialize(object o, string path = "") {
var formatter = new BinaryFormatter();
using (var stream = File.Create(Path.GetTempFileName())) {
return CanSerialize(o, path, formatter, stream);
}
}
static (bool success, string failPath, string errorMessage) CanSerialize(object o, string path, BinaryFormatter formatter, Stream stream) {
if (o == null) { return (false, path, "Null object"); }
string msg;
var t = o.GetType();
if (t.IsPrimitive || t == typeof(string)) { return (true, path, null); }
try {
formatter.Serialize(stream, o);
return (true, path, null);
} catch (Exception ex) {
msg = ex.Message;
}
List<(string, object)> values;
if (t.IsArray) {
values = (o as IEnumerable).ToObjectList()
.Select((x, index) => ($"[{index}]", x))
.Where(x => x.Item2 != null)
.ToList();
} else {
values = t.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)
.Where(fld => !fld.IsStatic)
.Select(fld => ($".{fld.Name}", fld.GetValue(o)))
.Where(x => x.Item2 != null)
.ToList();
}
foreach (var (name, value) in values) {
var ret = CanSerialize(value, path + name, formatter, stream);
if (!ret.success) { return ret; }
}
return (false, path, msg);
}
以下struct
定义:
[Serializable]
public struct EndNodeData {
public string Closure { get; set; }
public string Name { get; set; }
public string Type { get; set; }
public string Value { get; set; }
}
以下代码:
var endnodeData = new EndNodeData {
Closure = null,
Name = null,
Type = "int",
Value = "5"
};
Console.WriteLine(CanSerialize(endnodeData));
打印出来:
(错误,无法从程序集mscorlib,版本=4.0.0.0,文化=中性,PublicKeyToken=b77a5c561934e089"中加载类型System.Runtime.CompilerServices.IsReadOnlyAttribute".)
问题似乎出在这种特定类型或一般的值类型上.
It would seem the problem is with this specific type, or value types in general.
这篇关于序列化期间的 TypeLoadException的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!