我最近将我的ASP.NET Core应用程序之一从net461应用程序升级到ASP.NET Core 2.0应用程序，因为过去让我难过的唯一一件事就是System.Transactions（现在受支持）。
升级后，访问使用以下功能的任何功能时都会出现错误：
protected static TransactionScope GetTransactionScope()
{
TransactionOptions transactionOptions = new TransactionOptions
{
IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted,
Timeout = TransactionManager.MaximumTimeout
};
return new TransactionScope(TransactionScopeOption.Required, transactionOptions);
}
错误：
不支持加入环境事务。
根据我对Google的研究，我在GitHub上看到了一些与此相关的未解决问题，他们都说将System.Data.SqlClient升级到最新的预发行版将解决此问题。
我相信此问题已解决，但又引起了另一个问题。我在项目中使用的是Dapper v1.50.2，我认为它无法使用System.Data.SqlClient的预发布版本，因为现在出现以下错误：
抛出了'System.Data.SqlClient.SqlConnection'的类型初始值设定项
一个例外
有谁知道我如何使用Dapper并摆脱这种环境交易错误？我不确定发生这样的错误时如何将System.Transactions移植。
最佳答案
我最近解决了这个问题。
首先，在您的Web.csproj中替换
<PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.5" />
与
<PackageReference Include="Microsoft.AspNetCore" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Antiforgery" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.ApplicationInsights.HostingStartup" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Core" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Facebook" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Google" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.MicrosoftAccount" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.OAuth" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authentication.Twitter" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authorization" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Authorization.Policy" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.AzureAppServices.HostingStartup" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.AzureAppServicesIntegration" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.CookiePolicy" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Cors" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Cryptography.Internal" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Cryptography.KeyDerivation" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.DataProtection" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.DataProtection.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.DataProtection.AzureStorage" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.DataProtection.Extensions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Diagnostics.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Hosting" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Hosting.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Hosting.Server.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Html.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Http" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Http.Extensions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Http.Features" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.HttpOverrides" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Identity" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.JsonPatch" Version="2.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Localization" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Localization.Routing" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.MiddlewareAnalysis" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Abstractions" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.ApiExplorer" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Cors" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.DataAnnotations" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Json" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Formatters.Xml" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Localization" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.Extensions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.ViewCompilation" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.RazorPages" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.TagHelpers" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.ViewFeatures" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.NodeServices" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.Owin" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Razor" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Razor.Language" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Razor.Runtime" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.ResponseCaching" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.ResponseCaching.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.ResponseCompression" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Rewrite" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Routing" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Routing.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.HttpSys" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Core" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Https" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.Session" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.SpaServices" Version="2.0.2" />
<PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.WebSockets" Version="2.0.1" />
<PackageReference Include="Microsoft.AspNetCore.WebUtilities" Version="2.0.1" />
<PackageReference Include="Microsoft.CodeAnalysis.Razor" Version="2.0.1" />
<PackageReference Include="Microsoft.Data.Sqlite" Version="2.0.0" />
<PackageReference Include="Microsoft.Data.Sqlite.Core" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Caching.Redis" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.AzureKeyVault" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.CommandLine" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Ini" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.UserSecrets" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Configuration.Xml" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.DiagnosticAdapter" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.FileProviders.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.FileProviders.Composite" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.FileProviders.Physical" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.FileSystemGlobbing" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.Extensions.Identity.Core" Version="2.0.1" />
<PackageReference Include="Microsoft.Extensions.Identity.Stores" Version="2.0.1" />
<PackageReference Include="Microsoft.Extensions.Localization" Version="2.0.1" />
<PackageReference Include="Microsoft.Extensions.Localization.Abstractions" Version="2.0.1" />
<PackageReference Include="Microsoft.Extensions.Logging" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.AzureAppServices" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Configuration" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.EventSource" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Logging.TraceSource" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.ObjectPool" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Options" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Options.ConfigurationExtensions" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.Primitives" Version="2.0.0" />
<PackageReference Include="Microsoft.Extensions.WebEncoders" Version="2.0.0" />
<PackageReference Include="Microsoft.Net.Http.Headers" Version="2.0.1" />
<PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="2.0.1" />
在此程序包参考中，我删除了有关EntityFramework和SqlServer缓存的所有参考。
然后，添加对较早的System.Data.SqlClient的引用
<PackageReference Include="System.Data.SqlClient" Version="4.3.0" />
希望能帮助到你！
关于c# - Dapper在将System.Data.SqlClient升级到版本4.5.0-preview2后抛出System.Data.SqlClient.SqlConnection异常，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47421371/