我正在将 ASP.NET Core 1 应用程序从 RC 1 迁移到 RC 2。应用程序本身有 Web 应用程序(针对 netcoreapp1.0)和两个用于模型和数据访问层(netstandard1.5)的类库(.NET Core)有针对性)。这些类库使用 MongoDB 驱动程序 2.2.4。应用程序恢复依赖关系并编译,没有任何错误。但是,在 MongoDB 客户端初始化期间会抛出 FileNotFound 异常。
An exception of type 'System.IO.FileNotFoundException' occurred in MongoDB.Driver.dll but was not handled in user code
Additional information: Could not load file or assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.
at MongoDB.Driver.MongoUrlBuilder.Parse(String url)
at MongoDB.Driver.MongoUrl..ctor(String url)
at MongoDB.Driver.MongoClient..ctor(String connectionString)
at GS.Quest.DataAccess.Context..ctor() in
CoreWebApp\src\DataAccess\Context.cs:line 9
什么会导致这个问题?目前是否有可能在 ASP.NET Core RC 2 应用程序中使用旧版 MongoDB 驱动程序,而根本无需等待 .NET 核心版本的驱动程序?此外,ASP.NET Core RC 1 应用程序没有任何问题。
Web 应用程序 project.json
{
"userSecretsId": "aspnet-CoreWebApp-6f0c9639-a671-45df-afcb-f126e55c6e3e",
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.0-rc2-3002702",
"type": "platform"
},
"Microsoft.ApplicationInsights.AspNetCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Authentication.Cookies": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Diagnostics": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Razor.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
"Microsoft.AspNetCore.StaticFiles": "1.0.0-rc2-final",
"Microsoft.EntityFrameworkCore.SqlServer": "1.0.0-rc2-final",
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final",
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final",
"Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging.Debug": "1.0.0-rc2-final",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc2-final",
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"MongoDB.Driver": "2.2.4",
"Models": "1.0.0.*",
"DataAccess": "1.0.0.*"
},
"tools": {
"Microsoft.AspNetCore.Razor.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.AspNetCore.Server.IISIntegration.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview1-final",
"imports": [
"portable-net45+win8+dnxcore50",
"portable-net45+win8"
]
},
"Microsoft.Extensions.SecretManager.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
"version": "1.0.0-preview1-final",
"imports": [
"portable-net45+win8+dnxcore50",
"portable-net45+win8"
]
}
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"dnxcore50",
"dnx451",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"gcServer": true
},
"publishOptions": {
"include": [
"wwwroot",
"Views",
"appsettings.json",
"web.config"
]
},
"scripts": {
"prepublish": [ "npm install", "bower install", "gulp clean", "gulp min" ],
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
模型 project.json
{
"version": "1.0.0-*",
"dependencies": {
"NETStandard.Library": "1.5.0-rc2-24027",
"Microsoft.NETCore.Portable.Compatibility": "1.0.1-rc2-24027",
"MongoDB.Driver": "2.2.4"
},
"frameworks": {
"netstandard1.5": {
"imports": [ "dnxcore50", "dnx451" ]
}
}
}
数据访问项目.json
{
"version": "1.0.0-*",
"dependencies": {
"NETStandard.Library": "1.5.0-rc2-24027",
"Microsoft.NETCore.Portable.Compatibility": "1.0.1-rc2-24027",
"Microsoft.Extensions.Logging": "1.0.0-rc2-final",
"MongoDB.Driver": "2.2.4",
"Models": "1.0.0-*"
},
"frameworks": {
"netstandard1.5": {
"imports": [ "dnxcore50", "dnx451" ]
}
}
}
在迁移过程中,我关注了 official documentation然后我尝试将现有源代码移动到由 Visual Studio 2015 创建的示例 ASP.NET Core 1 RC 2 Web 应用程序。
更新
迁移到 net451 框架后,项目文件如下所示
网络应用
{
"userSecretsId": "aspnet-CoreWebApp-6f0c9639-a671-45df-afcb-f126e55c6e3e",
"dependencies": {
"Microsoft.ApplicationInsights.AspNetCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Authentication.Cookies": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Diagnostics": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Razor.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0-rc2-final",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0-rc2-final",
"Microsoft.AspNetCore.StaticFiles": "1.0.0-rc2-final",
"Microsoft.EntityFrameworkCore.SqlServer": "1.0.0-rc2-final",
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0-rc2-final",
"Microsoft.Extensions.Configuration.Json": "1.0.0-rc2-final",
"Microsoft.Extensions.Configuration.UserSecrets": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging.Console": "1.0.0-rc2-final",
"Microsoft.Extensions.Logging.Debug": "1.0.0-rc2-final",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0-rc2-final",
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {
"version": "1.0.0-preview1-final",
"type": "build"
},
"MongoDB.Driver": "2.2.4",
"Models": "1.0.0.*",
"DataAccess": "1.0.0.*"
},
"tools": {
"Microsoft.AspNetCore.Razor.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.AspNetCore.Server.IISIntegration.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.EntityFrameworkCore.Tools": {
"version": "1.0.0-preview1-final",
"imports": [
"portable-net45+win8+dnxcore50",
"portable-net45+win8"
]
},
"Microsoft.Extensions.SecretManager.Tools": {
"version": "1.0.0-preview1-final",
"imports": "portable-net45+win8+dnxcore50"
},
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": {
"version": "1.0.0-preview1-final",
"imports": [
"portable-net45+win8+dnxcore50",
"portable-net45+win8"
]
}
},
"frameworks": {
"net451": { }
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"gcServer": true
},
"publishOptions": {
"include": [
"wwwroot",
"Views",
"appsettings.json",
"web.config"
]
},
"scripts": {
"prepublish": [ "npm install", "bower install", "gulp clean", "gulp min" ],
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
模型
{
"version": "1.0.0-*",
"dependencies": {
"MongoDB.Driver": "2.2.4"
},
"frameworks": {
"net451": { }
}
}
数据访问
{
"version": "1.0.0-*",
"dependencies": {
"Microsoft.Extensions.Logging": "1.0.0-rc2-final",
"Models": "1.0.0-*"
},
"frameworks": {
"net451": { }
}
}
最佳答案
您不能在 netappcore1.0 应用程序中定位 MongoDB 驱动程序!并且请不要在 netappcore1.0 导入中使用 dnx451。 .NET 4.5.1 程序集不适用于 .NET Core 应用程序!只有 .NET Core 程序集(win8 和 win8.1/uwp 是基于 .NET 的,dnx451 不是)。它本质上说:“在 .NET Core 应用程序中安装 MongoDb,即使它不针对/支持它”。
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"dnxcore50",
"dnx451",
"portable-net45+win8"
]
}
这将强制 nuget 恢复 dnx451/net451 包,即使它们不受支持。 imports 部分只是作为一种解决方法,用于强制恢复与 .NET 核心兼容但尚未针对 netstandard1.5 的包(例如为 UWP 编写的包, Win8 或 Win8.1)。
如果您想使用 MongoDB 驱动程序,您必须以 net451 为目标,而不是 netcoreapp1.0 或 netstandard1.5。这适用于所有引用 MongoDB 的项目和子项目。
关于MongoDB 驱动程序抛出文件未找到异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37688495/
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