Npgsql：`AddEntityFrameworkNpgsqlTrigrams` 做什么？

Question

由于 Ngpsql 文档没有 comperhensive page for fuzzy string matching, I went with what test cases 正在使用，因此出现以下错误：

Exception has occurred: CLR/System.AggregateException
An unhandled exception of type 'System.AggregateException' occurred in API.dll: 'Some services are not able to be constructed'
    Inner exceptions found, see $exception in variables window for more details.
    Innermost exception      System.InvalidOperationException : Unable to resolve service for type 'Microsoft.EntityFrameworkCore.Storage.IRelationalTypeMappingSource' while attempting to activate 'Npgsql.EntityFrameworkCore.           PostgreSQL.Query.ExpressionTranslators.Internal.NpgsqlTrigramsMethodCallTranslatorPlugin'.
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateArgumentCallSites(Type serviceType, Type implementationType, CallSiteChain callSiteChain, ParameterInfo[] parameters, Boolean            throwIfCallSiteNotFound)
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.CreateConstructorCallSite(ResultCache lifetime, Type serviceType, Type implementationType, CallSiteChain callSiteChain)
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.TryCreateExact(ServiceDescriptor descriptor, Type serviceType, CallSiteChain callSiteChain, Int32 slot)
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteFactory.GetCallSite(ServiceDescriptor serviceDescriptor, CallSiteChain callSiteChain)
    at Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngine.ValidateService(ServiceDescriptor descriptor)

通常我会问发生了什么，但我注意到如果我不使用 AddEntityFrameworkNpgsqlTrigrams，我能够编译和调用三元组函数（确切地说是 TrigramsSimilarity）导致我的表达被成功翻译。所以我的问题是：AddEntityFrameworkNpgsqlTrigrams 有什么用？我可以不提吗？
我应该注意，我使用的是 Npgsql.EntityFrameworkCore.PostgreSQL.Trigrams 版本 3.1.4。我们还没有迁移到 .NET 5.0

Answer 1

通常使用 Trigram 插件的方法是参考 OnModelConfiguring 中的 Npgsql.EntityFrameworkCore.PostgreSQL.Trigrams nuget package, and call UseTrigrams:

options.UseNpgsql(@"<connection string>", o => o.UseTrigrams())

This is documented here。应用程序很少需要直接调用 AddEntityFrameworkNpgsqlTrigrams。

Npgsql：`AddEntityFrameworkNpgsqlTrigrams` 做什么？

Npgsql: What does `AddEntityFrameworkNpgsqlTrigrams` do?

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