c# - 在 ConfigureServices(IServiceCollection services) 中调用 services.AddOptions() 不明确

Question

在 ConfigureServices(IServiceCollection services) 中添加 services.AddOptions() 后出现以下错误:

CS0121  
The call is ambiguous between the following methods or properties: Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(Microsoft.Extensions.DependencyInjection.IServiceCollection) and Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptions(Microsoft.Extensions.DependencyInjection.IServiceCollection)'

代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

...

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddOptions();
    ...
}

这特别奇怪，因为在相同的“方法或属性”之间存在歧义

Answer 1

基于 this question 的反馈我追踪到我在 project.lock.json 中有一个对 "EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final" 的引用，它本身有一个引用 "Microsoft.Extensions.OptionsModel": "1.0.0-rc1-final"

重点是只引用 "Microsoft.Extensions.Options": "1.0.0-rc2-final" 并删除所有对 OptionsModel 的引用.