不能强制转换到看似相同的类

Question

我正在用.NET-5编写C#，并尝试基于一些XML实例化一个类。这似乎工作得很好，因为我得到了所需对象的一个实例：

var refxmlFileInfo = new FileInfo(settings.COBDateSetting);
// Casting fails. The Object is of the expected type
CalcConfiguration.CobDateSettings = (COBDate_Settings)factoryHelper.GetInstance(refxmlFileInfo, xmlFileInfo.FullName);

但是，转换失败，并出现一个奇怪的错误，表明实例和目标的类型相同：

[A]DataModel.BusinessDays.COBDate_Settings cannot be cast to
[B]DataModel.BusinessDays.COBDate_Settings.

Type A originates from 'DataModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' in the context 'Default' at location
'<REMOVED>\bin\Debug\net5.0\DataModel.dll'.

Type B originates from 'DataModel, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' in the context 'Default' at location
'<REMOVED>\bin\Debug\net5.0\DataModel.dll'.

我已经检查了项目之间的引用，但没有发现任何异常。

public object GetInstance(FileInfo xmlFileInfo,string usedWhere)
{
   ISettings setting = GetSettings(xmlFileInfo, usedWhere);
   var classToResolve = ((IDefiningType)setting).GetDefiningType();
   var classInstance = (IInitializeXML)Unity.Resolve(classToResolve);
   classInstance.InitializeXML(this, xmlFileInfo);
   return classInstance;
}

public ISettings GetSettings(FileInfo xmlFileInfo,string usedWhere)
{
   if (!xmlFileInfo.Exists)
   {
     var msg = string.Format("Path: <{0}> not found in referenced file: {1}", xmlFileInfo.FullName,usedWhere);
     throw new Exception(msg);
    }

// Uses some regex to find out which class is XML-Serialized. The string is // then checked against all types in assembly. Types are extracted using
// *.dll and the loading the assembly
var typeToResolve = GetSettingsType(xmlFileInfo);
// We now have a instance of the definingType class
ISettings setting = (ISettings)Convert.ChangeType(SettingsSerializer.Deserialize(typeToResolve, xmlFileInfo), typeToResolve);
            return setting;
 }

有没有人知道问题出在哪里？

Answer 1

我找到了解决方案。原因是我使用LoadFile遍历了DLL：

var baseDir = AppContext.BaseDirectory;
var dir = new DirectoryInfo(baseDir);
foreach (var dllfile in dir.GetFiles("*.dll"))

似乎C#没有意识到这些类是相同的，并且它们来自同一个动态链接库。我使用这篇文章中的一个解决方案解决了这个问题：

Getting Information about a assembly which is present in Solution

public IEnumerable<Assembly> GetAssemblies()
        {
            var list = new List<string>();
            var stack = new Stack<Assembly>();

            stack.Push(Assembly.GetEntryAssembly());

            do
            {
                var asm = stack.Pop();

                yield return asm;

                foreach (var reference in asm.GetReferencedAssemblies())
                    if (!list.Contains(reference.FullName))
                    {
                        stack.Push(Assembly.Load(reference));
                        list.Add(reference.FullName);
                    }

            }
            while (stack.Count > 0);

        }

但是，在这种情况下，我必须引用所有程序集，并在引用的程序集中调用某些内容。上面的代码似乎只有在dlls已经加载的情况下才能工作。