如何通过ASP.NET Core Web应用读取appsettings.json配置文件？

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1. 安装Nuget包：Microsoft.Extensions.Configuration.Json

2.在appsettings.json中添加：

json ConnectionStrings: { Logging: { LogLevel: { Default: Warning } }, SQLConnection: Data Source=127.0.0.1;Database=xxxx;UID=xx;PWD=xx }

1.Nuget添加Microsoft.Extensions.Configuration.Json

2.appsettings.json中添加"ConnectionStrings"

{ "Logging": { "LogLevel": { "Default": "Warning" } }, "ConnectionStrings": { "SQLConnection": "Data Source=127.0.0.1;Database=xxxx;UID=xx;PWD=xx;", "OracleConnection": "", "MySqlConnection": "", "SqlLiteConnection": "" }, "AllowedHosts": "*" }

3.新建AppSettingsJson.cs

using Microsoft.Extensions.Configuration; using System.IO; namespace WebAPI { public class AppSettingsJson { public static string ApplicationExeDirectory() { var location = System.Reflection.Assembly.GetExecutingAssembly().Location; var appRoot = Path.GetDirectoryName(location); return appRoot; } public static IConfigurationRoot GetAppSettings() { string applicationExeDirectory = ApplicationExeDirectory(); var builder = new ConfigurationBuilder() .SetBasePath(applicationExeDirectory) .AddJsonFile("appsettings.json"); return builder.Build(); } } }

4.C#调用

var config = AppSettingsJson.GetAppSettings(); var str = config.GetSection("ConnectionStrings:SQLConnection").Value;