c# - “ConfigurationBuilder”不包含 'AddJsonFile' 的定义

Question

我有以下错误:

Program.cs(15,72): error CS1061: 'ConfigurationBuilder' does not contain a definition for 'AddJsonFile' and no accessible extension method 'AddJsonFile' accepting a first argument of type 'ConfigurationBuilder' could be found (are you missing a using directive or an assembly

该项目是一个 dotnet 核心应用程序、控制台应用程序，使用 Azure 搜索 SDK

错误行如下:

using System;
using System.Linq;
using System.Threading;
using Microsoft.Azure.Search;
using Microsoft.Azure.Search.Models;
using Microsoft.Extensions.Configuration;
using Microsoft.Spatial;

namespace DemoSearchIndexer
{
    class Program
    {
        static void Main(string[] args)
        {
            IConfigurationBuilder builder = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json");
            IConfigurationRoot configuration = builder.Build();
            ...

Answer 1

AddJsonFile NuGet 中提供了扩展方法:

• Microsoft.Extensions.Configuration.Json

构建 ASP.NET Core 应用程序时，通常会引用 Microsoft.AspNetCore.App(或者，历史上是 Microsoft.AspNetCore.All)，您会得到此“免费”。

构建控制台应用程序或不引用元包的应用程序时，您需要显式引用 Microsoft.Extensions.Configuration.Json。