我们在iis发布web网站时有时会遇到这个问题，会报这个异常，
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<span><H1>“/”应用程序中的服务器错误。<hr width=100% size=1 color=silver></H1>
<h2> <i>未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。</i> </h2></span>
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<b> 说明: </b>执行当前 Web 请求期间，出现未经处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
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<b> 异常详细信息: </b>System.BadImageFormatException: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。<br><br>
<b>源错误:</b> <br><br>
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执行当前 Web 请求期间生成了未经处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。</code>
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<b>程序集加载跟踪:</b> 下列信息有助于确定程序集“Pechkin”未能加载的原因。<br><br>
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警告: 程序集绑定日志记录被关闭。
要启用程序集绑定失败日志记录，请将注册表值 [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD)设置为 1。
注意: 会有一些与程序集绑定失败日志记录关联的性能损失。
要关闭此功能，请移除注册表值 [HKLM\Software\Microsoft\Fusion!EnableLog]。
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<b>堆栈跟踪:</b> <br><br>
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[BadImageFormatException: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。]
System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +0
System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) +225
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection) +110
System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +22
System.Reflection.Assembly.Load(String assemblyString) +34
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +48
[ConfigurationErrorsException: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。]
System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +767
System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +256
System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +58
System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +281
System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies() +69
System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded) +137
System.Web.Compilation.BuildManager.ExecutePreAppStart() +172
System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException) +848
[HttpException (0x80004005): 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。]
System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +532
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +111
System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +714
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<b>版本信息:</b> Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.7.3282.0
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[BadImageFormatException]: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。
在 System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
在 System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
在 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean forIntrospection)
在 System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
在 System.Reflection.Assembly.Load(String assemblyString)
在 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)
[ConfigurationErrorsException]: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。
在 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)
在 System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory()
在 System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai)
在 System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)
在 System.Web.Compilation.BuildManager.GetPreStartInitMethodsFromReferencedAssemblies()
在 System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath, Boolean& isRefAssemblyLoaded)
在 System.Web.Compilation.BuildManager.ExecutePreAppStart()
在 System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)
[HttpException]: 未能加载文件或程序集“Pechkin”或它的某一个依赖项。试图加载格式不正确的程序。
在 System.Web.HttpRuntime.FirstRequestInit(HttpContext context)
在 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context)
在 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context)
-->原因:操作系统是64位的，但发布的程序引用了一些32位的ddl，所以出现了兼容性的问题 解决方案一:如果是64位机器，IIS————高级设置——启用32位应用程序 ：true。 解决方案二:修改项目属性——生成——目标平台（比如，X86\X64）