建议为程序集提供完全指定的文本标识。

Question

我想在运行时使用以下命令实例化一个类

_syncHelper = (ISyncHelper) Activator.CreateInstance("SBD.Syrius.Synchronisation", "SyncHelper");


A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

System.IO.FileNotFoundException: Could not load file or assembly 

'SBD.Syrius.Synchronisation' or one of its dependencies. The system cannot find the file specified.

File name: 'SBD.Syrius.Synchronisation'
at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase,    
Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr   pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
at System.Activator.CreateInstance(String assemblyName, String typeName)

at SBD.Syrius.DataLayer.DataHelper.get_SyncHelper() in e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.DataLayer\DataHelper.cs:line 35

at SBD.Syrius.DataLayer.Context.SaveChanges() in e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.DataLayer\Context.cs:line 99

at SBD.Syrius.UI.MDIHelper.AttemptToSave(Context Db) in  e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.UI\MDIHelper.cs:line 51

=== Pre-bind state information ===
LOG: User = saturn\kirsten
LOG: DisplayName = SBD.Syrius.Synchronisation
(Partial)
WRN: Partial binding information was supplied for an assembly:
WRN: Assembly Name: SBD.Syrius.Synchronisation | Domain ID: 1
WRN: A partial bind occurs when only part of the assembly display name is provided.
WRN: This might result in the binder loading an incorrect assembly.
WRN: It is recommended to provide a fully specified textual identity for the assembly,
WRN: that consists of the simple name, version, culture, and public key token.
WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information 
and common solutions to this issue.
LOG: Appbase = file:///E:/EShared/Syrius6/syrius_syrius/SBD.Syrius.UI/bin/Debug/
LOG: Initial PrivatePath = NULL
Calling assembly : SBD.Syrius.DataLayer, Version=1.0.0.0, Culture=neutral,  
PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file:    
E:\EShared\Syrius6\syrius_syrius\SBD.Syrius.UI\bin\Debug\SBD.Syrius.UI.vshost.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from    
C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or    
location-based assembly bind).

LOG: Attempting download of new URL          file:///E:/EShared/Syrius6/syrius_syrius/SBD.Syrius.UI/bin/Debug/SBD.Syrius.Synchronisation.DLL.

LOG: Attempting download of new URL   file:///E:/EShared/Syrius6/syrius_syrius/SBD.Syrius.UI/bin/Debug/SBD.Syrius.Synchronisation/SBD.Syrius.Synchronisation.DLL.

LOG: Attempting download of new URL file:///E:/EShared/Syrius6/syrius_syrius/SBD.Syrius.UI/bin/Debug/SBD.Syrius.Synchronisation.EXE.

LOG: Attempting download of new URL file:///E:/EShared/Syrius6/syrius_syrius/SBD.Syrius.UI/bin/Debug/SBD.Syrius.Synchronisation/ SBD.Syrius.Synchronisation.EXE.

我的文件是用小写.dll创建的

有没有一个如何为程序集提供完全指定的文本标识的示例？我是否应该尝试更改.dll扩展的大小写？

如果我实际将.dll复制到UI\bin\debug文件夹，则会得到不同的错误

A first chance exception of type 'System.TypeLoadException' occurred in mscorlib.dll
System.TypeLoadException: Could not load type 'SyncHelper' 
from assembly  

'SBD.Syrius.Synchronisation，Version=1.0.0.0，Culture=neutral，PublicKeyToken=null‘。

 at System.Reflection.RuntimeAssembly.GetType(RuntimeAssembly assembly, String name,    
 Boolean throwOnError, Boolean ignoreCase, ObjectHandleOnStack type)


at System.Reflection.RuntimeAssembly.GetType(String name, Boolean throwOnError, Boolean ignoreCase)

 at System.Activator.CreateInstance(String assemblyString, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture,   Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)

at System.Activator.CreateInstance(String assemblyName, String typeName)
at SBD.Syrius.DataLayer.DataHelper.get_SyncHelper() in   

e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.DataLayer\DataHelper.cs:line 35
at SBD.Syrius.DataLayer.Context.SaveChanges() in 

e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.DataLayer\Context.cs:line 99

at SBD.Syrius.UI.MDIHelper.AttemptToSave(Context Db) in   
e:\EShared\Syrius6\syrius_syrius\SBD.Syrius.UI\MDIHelper.cs:line 51

Answer 1

找出三个错误：

1. Activator.CreateInstance需要类型的完整名称才能加载它，这意味着您必须将命名空间添加到类型名称中。

你有可能在不同的命名空间中有多个同名的类，那么它如何确定加载了哪一个。

• 你想要创建一个接口的实例，这是不可能的。

ISyncHelper是一个接口，你不能说：

var variable = new ISynchHelper()

它会导致编译错误，因为接口只是一个空的主体，不包含一行实现。

因此，每次使用反射进行测试时，都要小心，因为编译器无法帮助您，如果出现问题，您将在运行时而不是在编译时面对它。

• 最后一个错误是由于UI中没有对同步项目的引用，这意味着它不会复制到UI的Bin文件夹中。project.You可以通过将同步项目添加到UI或仅在生成后向要复制的同步项目添加复制命令来执行此操作。

祝你好运:-)