关于c＃：如何在Core 2.0中的ConfigurationBuilder中设置SetBasePath 引入包解决 .AddEnvironmentVariables()报错

标签：AddEnvironmentVariables Core SetBasePath Json 报错 AddJsonFile Extensions Configur

关于c＃：如何在Core 2.0中的ConfigurationBuilder中设置SetBasePath
https://www.codenong.com/46843367/

How to SetBasePath in ConfigurationBuilder in Core 2.0

如何在Core 2.0的ConfigurationBuilder中设置基本路径。

我已经在Google上搜索并找到了这个问题，这个问题来自Microsoft文档以及在线的2.0文档，但是他们似乎正在使用1.0.0-beta8中的Microsoft.Extension.Configuration版本。

我想阅读appsettings.json。在Core 2.0中，有没有新的方法可以做到这一点？

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using System;
using System.IO;
using Microsoft.Extensions.Configuration;
namespace ConsoleApp2
{
class Program
{
public static IConfigurationRoot Configuration { get; set; }

static void Main(string[] args)
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory()) // <== compile failing here
.AddJsonFile("appsettings.json");

Configuration = builder.Build();

Console.WriteLine(Configuration.GetConnectionString("con"));
Console.WriteLine("Press a key...");
Console.ReadKey();
}
}
}

appsetting.json

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{
"ConnectionStrings": {
"con":"connection string"
}
}

更新：
除了按照Set指示的那样添加Microsoft.Extensions.Configuration.FileExtensions，我还需要添加Microsoft.Extensions.Configuration.Json来获取AddJsonFile扩展名。

相关讨论

类文件中唯一必需的using语句应该是Microsoft.Extensions.Configuration。但是，必须通过"管理NuGet包"项目选项显式添加NuGet依赖项" Microsoft.Extensions.Configuration.Json"。其依赖项是" Microsoft.Extensions.Configuration.FileExtensions"，因此将作为依赖项连接的一部分包括在内。这两个依赖关系将解决" SetBasePath"和" AddJsonFile"编译错误。
值得指出的是，它不再可用作Mac预览版的VS设置当前目录为bin / netcoreapp2x
不是学究的，而是Configuration.EnvironmentVariables == Microsoft.Extensions.Configuration.EnvironmentVariables。有几件名字相似的东西。

同时使用" Microsoft.Extensions.Configuration"和" Microsoft.Extensions.Configuration.Json"，这将解决问题。

https://www.nuget.org/packages/Microsoft.Extensions.Configuration/
https://www.nuget.org/packages/Microsoft.Extensions.Configuration.Json/

这是示例" ConnectionFactory"

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using System.Data;
using System.Data.SqlClient;
using Microsoft.Extensions.Configuration;
using System.IO;

namespace DataAccess.Infrastructure
{
public class ConnectionFactory : IConnectionFactory
{
public ConnectionFactory()
{
var builder = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json");
Configuration = builder.Build();
}

public IConfigurationRoot Configuration { get; }
public IDbConnection GetConnection
{
get
{
var connectionString = Configuration.GetConnectionString("DefaultConnection");
var conn = new SqlConnection(connectionString);
conn.Open();
return conn;
}
}

#region IDisposable Support
private bool disposedValue = false; // To detect redundant calls

protected virtual void Dispose(bool disposing)
{
if (!disposedValue)
{
if (disposing)
{
// TODO: dispose managed state (managed objects).
}

// TODO: free unmanaged resources (unmanaged objects) and override a finalizer below.
// TODO: set large fields to null.

disposedValue = true;
}
}

// TODO: override a finalizer only if Dispose(bool disposing) above has code to free unmanaged resources.
// ~ConnectionFactory() {
// // Do not change this code. Put cleanup code in Dispose(bool disposing) above.
// Dispose(false);
// }

// This code added to correctly implement the disposable pattern.
public void Dispose()
{
// Do not change this code. Put cleanup code in Dispose(bool disposing) above.
Dispose(true);
// TODO: uncomment the following line if the finalizer is overridden above.
// GC.SuppressFinalize(this);
}
#endregion
} }

标签：AddEnvironmentVariables,Core,SetBasePath,Json,报错,AddJsonFile,Extensions,Configur
From： https://www.cnblogs.com/sunny3158/p/17033874.html

关于c＃：如何在Core 2.0中的ConfigurationBuilder中设置SetBasePath 引入包解决 .AddEnvironmentVariables()报错

How to SetBasePath in ConfigurationBuilder in Core 2.0

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