这篇文章给大家分享的是有关.Net Core3.0如何配置Configuration的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
准备
.NET core和.NET项目配置上有了很大的改变，支持的也更加丰富了比如命令行，环境变量，内存中.NET对象，设置文件等等。.NET项目我们常常把配置信息放到webConfig 或者appConfig中。配置相关的源码https://github.com/aspnet/Extensions；如果打开源码项目 如果遇到以下错误，未遇到直接跳过。
错误提示： error : The project file cannot be opened by the project system, because it is missing some critical imports or the referenced SDK cannot be found. Detailed Information:
解决办法：查看本地安装的sdk 与 global.json中制定的版本是否一致：然后修改即可
public static IHostBuilder CreateDefaultBuilder(string[] args){var builder = new HostBuilder();builder.UseContentRoot(Directory.GetCurrentDirectory());builder.ConfigureHostConfiguration(config =>{config.AddEnvironmentVariables(prefix: "DOTNET_");if (args != null){config.AddCommandLine(args);}});builder.ConfigureAppConfiguration((hostingContext, config) =>{var env = hostingContext.HostingEnvironment;config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true).AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);if (env.IsDevelopment() && !string.IsNullOrEmpty(env.ApplicationName)){var appAssembly = Assembly.Load(new AssemblyName(env.ApplicationName));if (appAssembly != null){config.AddUserSecrets(appAssembly, optional: true);}}
将文件读入配置时，会创建一下唯一的分层健来保存配置值：
Logging:LogLevel:Default
Logging:LogLevel:System
Logging:LogLevel:Microsoft
Logging:LogLevel:Microsoft.Hosting.Lifetime
AllowedHosts
var jsonValue = $"AllowedHosts:{_config["AllowedHosts"]}"+ "\r\n";jsonValue += "Logging:LogLevel:Default：" + _config.GetValue<string>("Logging:LogLevel:Default")+ "\r\n";//GetSection 返回IConfigurationSection；如果未匹配到 返回null//jsonValue += "---" + _config.GetSection("Logging:LogLevel:System");jsonValue += "Logging:LogLevel:System：" + _config.GetSection("Logging:LogLevel:System").Value+ "\r\n\n";var logSection = _config.GetSection("Logging:LogLevel");var configurationSections = logSection.GetChildren();foreach (var sections in configurationSections){jsonValue += $"{sections.Path}:{sections.Value}";jsonValue += "\r\n";}jsonValue += "\r\n";
输出：
{"AA": {"RabbitMqHostUrl": "rabbitmq://localhost:5672","RabbitMqHostName": "localhost","RabbitMqUserName": "admin","RabbitMqPassword": "123"}}
public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureAppConfiguration((hostingContext, config) => { config.SetBasePath(Directory.GetCurrentDirectory()); config.AddJsonFile("AAAppSettings.json", optional: true, reloadOnChange: true); })
使用bind方法绑定到新建的类上如：
public partial class AAConfig { public string RabbitMqHostUrl { get; set; } public string RabbitMqHostName { get; set; } public string RabbitMqUserName { get; set; } public string RabbitMqPassword { get; set; } }
var aaConfig = new AAConfig();_config.GetSection("AA").Bind(aaConfig);jsonValue += aaConfig.RabbitMqHostUrl + "\r\n";jsonValue += aaConfig.RabbitMqHostName + "\r\n";jsonValue += aaConfig.RabbitMqUserName + "\r\n";jsonValue += aaConfig.RabbitMqPassword + "\r\n";return jsonValue;
运行输出：
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