ServiceStack NetCoreAppSettings 配置文件读取和设置

假设node和npm已经安装

npm install -g @servicestack/cli

执行命令dotnet-new selfhost sshost

这样就创建了servicestack的控制台程序，用vs2017解决方案，添加如下代码

 

using funq;
using microsoft.aspnetcore.builder;
using microsoft.aspnetcore.hosting;
using microsoft.extensions.configuration;
using microsoft.extensions.dependencyinjection;
using servicestack;
using sshost.serviceinterface;
using system;
using system.io;
using system.threading.tasks;

namespace sshost
{
    public class program
    {
        public static void main(string[] args)
        {
            var host = new webhostbuilder()
                .usekestrel()
                .usecontentroot(directory.getcurrentdirectory())
                .usestartup<startup>()
                .useurls(environment.getenvironmentvariable("aspnetcore_urls") ?? "http://localhost:5000/")
                .build();

            host.run();
        }
    }

    public class startup
    {

        public iconfiguration configuration { get; set; }
        public startup(iconfiguration configuration) => configuration = configuration;

        // this method gets called by the runtime. use this method to add services to the container.
        public void configureservices(iservicecollection services)
        {

        }

        // this method gets called by the runtime. use this method to configure the http request pipeline.
        public void configure(iapplicationbuilder app, ihostingenvironment env)
        {
            //nuget里添加microsoft.extensions.configuration.json，否则编译不认识addjsonfile
            var builder = new configurationbuilder()
                  .setbasepath(env.contentrootpath)
                  .addjsonfile($"appsettings.json", optional: true)
                  .addenvironmentvariables();

            configuration = builder.build();

            app.useservicestack(new apphost
            {
                appsettings = new netcoreappsettings(configuration)
            });

            app.run(context =>
            {
                context.response.redirect("/metadata");
                return task.fromresult(0);
            });
        }
    }

    public class apphost : apphostbase
    {
        public apphost()
            : base("sshost", typeof(myservices).assembly) { }

        public class pageconfig
        {
            public int lightlistpagesize { get; set; }

            public int gatewaylistpagesize { get; set; }
        }

        public override void configure(container container)
        {
            setconfig(new hostconfig
            {
                debugmode = appsettings.get(nameof(hostconfig.debugmode), false)
            });

            #region 读取或者设置netcoreappsettings

            //读取单个值
            console.writeline($"maxrecords: {appsettings.getstring("maxrecords")}");

            //读取对象属性
            console.writeline($"pageconfig: {appsettings.getstring("pageconfig:lightlistpagesize")}");

            //读取整个对象
            var pageconfig = appsettings.get<pageconfig>("pageconfig");

            console.writeline($"connectionstring: {appsettings.getstring("connectionstrings:defaultconnection")}");

            //设置每页记录最大数量为200
            appsettings.set<int>("maxrecords", 200);
            console.writeline($"maxrecords: {appsettings.getstring("maxrecords")}");

            pageconfig.lightlistpagesize = 50;
            pageconfig.gatewaylistpagesize = 60;

            //设置属性，然后读取对象
            appsettings.set<int>("pageconfig:lightlistpagesize", 50);
            var pageconfig2 = appsettings.get<pageconfig>("pageconfig");

            console.writeline("设置配置完毕");

            #endregion

        }
    }
}

 项目sshost里添加配置文件appsettings.json，里面配置内容如下

{
  "maxrecords": "300",
  "pageconfig": {
    "lightlistpagesize": "10",
    "gatewaylistpagesize": "20"
  },
  "connectionstrings": {
    "defaultconnection": "server=(localdb)\\mssqllocaldb;database=_change_me;trusted_connection=true;multipleactiveresultsets=true"
  }
}

编译运行，出现如下错误信息

1>------ 已启动全部重新生成: 项目: sshost.servicemodel, 配置: debug any cpu ------
1>sshost.servicemodel -> d:\sshost\sshost.servicemodel\bin\debug\netstandard2.0\sshost.servicemodel.dll
2>------ 已启动全部重新生成: 项目: sshost.serviceinterface, 配置: debug any cpu ------
2>sshost.serviceinterface -> d:\sshost\sshost.serviceinterface\bin\debug\netstandard2.0\sshost.serviceinterface.dll
3>------ 已启动全部重新生成: 项目: sshost, 配置: debug any cpu ------
4>------ 已启动全部重新生成: 项目: sshost.tests, 配置: debug any cpu ------
4>sshost.tests -> d:\sshost\sshost.tests\bin\debug\netcoreapp2.1\sshost.tests.dll
3>program.cs(47,20,47,31): error cs1061: “iconfigurationbuilder”未包含“addjsonfile”的定义，并且找不到可接受第一个“iconfigurationbuilder”类型参数的可访问扩展方法“addjsonfile”(是否缺少 using 指令或程序集引用?)
3>已完成生成项目“sshost.csproj”的操作 - 失败。
========== 全部重新生成: 成功 3 个，失败 1 个，跳过 0 个 ==========

nuget里添加microsoft.extensions.configuration.json，否则编译不认识addjsonfile

再次编译运行

 

总结一下，servicestack的appsettings功能非常强大，并且非常好用，不仅支持过去的web.config，也支持.net core的appsettings.json，还支持文本文件

想了解更多的情况，可以查看文档：https://github.com/servicestack/docs/blob/master/docs/_documentation/appsettings.md