曖昧通話services.AddOptions（）（IServiceCollection服務）

Question

在ConfigureServices(IServiceCollection services)加入services.AddOptions()後出現以下錯誤：

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)' 

代碼：

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(); 
    ... 
} 

這是特別奇怪的模糊性在相同的'方法或專有'之間'

Answer 1

基於來自this question的反饋，我追蹤到我曾在一個project.lock.json參考"EntityFramework.MicrosoftSqlServer": "7.0.0-rc1-final"其自身具有"Microsoft.Extensions.OptionsModel": "1.0.0-rc1-final"

參考的意義就在於只有引用"Microsoft.Extensions.Options": "1.0.0-rc2-final"並刪除所有的人到OptionsModel。