CS0016: 未能写入(A compilation error has occurred.HttpCompileException: error CS0016: Could not write to

转自VC错误:http://www.vcerror.com/?p=1689
问题描述：

项目部署一直挺好的，今天使用时，突然在日记中报错！

System.UnauthorizedAccessException: Access to the temp directory is denied. Identity 'IIS APPPOOL\zbs_Remoter_20104' under which XmlSerializer is running does not have sufficient permission to access the temp directory. CodeDom will use the user account
the process is using to do the compilation, so if the user doesn�t have access to system temp directory, you will not be able to compile. Use Path.GetTempPath() API to find out the temp directory location.

Server stack trace:

at System.Xml.Serialization.Compiler.Compile(Assembly parent, String ns, XmlSerializerCompilerParameters xmlParameters, Evidence evidence)

at System.Xml.Serialization.TempAssembly.GenerateAssembly(XmlMapping[] xmlMappings, Type[] types, String defaultNamespace, Evidence evidence, XmlSerializerCompilerParameters parameters, Assembly assembly, Hashtable assemblies)

at System.Xml.Serialization.XmlSerializer.GetSerializersFromCache(XmlMapping[] mappings, Type type)

at System.Xml.Serialization.XmlSerializer.FromMappings(XmlMapping[] mappings, Type type)

在浏览器中，页面返回如下错误信息：

error CS0016: Could not write to output file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\62dbbf01\a08ea1a8\App_global.asax.qujxfrcb.dll' -- '拒绝访问。 ' at System.Web.Compilation.AssemblyBuilder.Compile() at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
at System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) at System.Web.Compilation.BuildManager.CompileGlobalAsax() at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() at System.Web.Compilation.BuildManager.CallAppInitializeMethod()
at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)

……………………

at System.Web.Compilation.AssemblyBuilder.Compile() at System.Web.Compilation.BuildProvidersCompiler.PerformBuild() at System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) at System.Web.Compilation.BuildManager.CompileGlobalAsax()
at System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() at System.Web.Compilation.BuildManager.CallAppInitializeMethod() at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory
configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)

很是奇怪，竟然提示：

CS0016: Could not write to output file 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\62dbbf01\a08ea1a8\App_global.asax.qujxfrcb.dll' -- '拒绝访问。 '



解决方法：

具体的解决方法参考文章:http://www.vcerror.com/?p=1689