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安装Hangfire

　　在webapi项目中通过nuget安装Hangfire.Core，Hangfire.sqlServer，Hangfire.AspNetCore，截止到目前的最新版本是1.7.6。

使用MSsql 数据库

　　可以创建一个新的数据库，或者使用现有数据库。

CREATE DATABASE [HangfireTest]
GO

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设置appsettings.json

{
  "ConnectionStrings": {
    "Hangfire": "Server=.;Database=mssqllocaldb;Integrated Security=SSPI;"
  },"Logging": {
    "LogLevel": {
      "Default": "Warning","Hangfire": "Information"
    }
  },"AllowedHosts": "*"
}

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注册hangfire服务

　　在startup.cs引用Hangfire和Hangfire.sqlServer，然后注册hangfire服务。

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
    // 注册Hangfire服务
    services.AddHangfire(configuration => configuration
        .SetDataCompatibilityLevel(CompatibilityLevel.Version_170)
        .UseSimpleAssemblyNameTypeSerializer()
        .UseRecommendedSerializerSettings()
        .UsesqlServerStorage(Configuration.GetConnectionString("HangfireConnection"),new sqlServerStorageOptions
        {
            CommandBatchMaxTimeout = TimeSpan.FromMinutes(5),SlidingInvisibilityTimeout = TimeSpan.FromMinutes(5),QueuePollInterval = TimeSpan.Zero,UseRecommendedIsolationLevel = true,UsePageLocksOnDequeue = true,DisableGlobalLocks = true
        }));

    services.AddHangfireServer();

    services.AddMvc();
}

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　　修改configure方法

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app,IBackgroundJobClient backgroundJobs,IHostingEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    else
    {
        // The default HSTS value is 30 days. You may want to change this for production scenarios,see https://aka.ms/aspnetcore-hsts.
        app.UseHsts();
    }

    app.UseHangfireDashboard();
    backgroundJobs.Enqueue(() => Console.WriteLine("hello from hangfire"));

    app.UseHttpsRedirection();
    app.UseMvc();
}