动态制作 HangFire 连接字符串 .Net Core

Question

我有一个使用 HangFire 进行后台作业的项目，我需要动态更改连接字符串，而无需每次都手动更改代码，因为我想运行将此作业发送给任何客户许多客户和许多数据库我已经根据此解决方案对启动和 DbContext 中的正常连接进行了此操作，并且工作起来很有魅力

我想对 HangFire 连接做同样的事情，这是我现在使用的代码

            services.AddHangfire(configuration => configuration.UseStorage(
            new MySqlStorage("server=127.0.0.1;uid=root;database=0046696-k; Allow User Variables=True",
            new MySqlStorageOptions()
            {
                TransactionIsolationLevel = (System.Transactions.IsolationLevel?)IsolationLevel.ReadCommitted,
                QueuePollInterval = TimeSpan.FromSeconds(15),
                JobExpirationCheckInterval = TimeSpan.FromHours(1),
                CountersAggregateInterval = TimeSpan.FromMinutes(5),
                PrepareSchemaIfNecessary = true,
                DashboardJobListLimit = 50000,
                TransactionTimeout = TimeSpan.FromMinutes(1),
                TablesPrefix = "Hangfire"
            })));
        services.AddHangfireServer();

Answer 1

不要对连接字符串进行硬编码。

保存在appsettings.json文件中

例如

{
  "ConnectionStrings": {
    "Hangfire": "server=127.0.0.1;uid=root;database=0046696-k; Allow User Variables=True"
  }

  /* other settings */
}

并在启动时加载。

//...Assume IConfiguration Configuration is loaded

//...

string connectionString = Configuration.GetConnectionString("Hangfire"); //<-- NOTE

services.AddHangfire(configuration => configuration.UseStorage(
    new MySqlStorage(connectionString, //<-- NOTE
    new MySqlStorageOptions() {
        TransactionIsolationLevel = (System.Transactions.IsolationLevel?)IsolationLevel.ReadCommitted,
        QueuePollInterval = TimeSpan.FromSeconds(15),
        JobExpirationCheckInterval = TimeSpan.FromHours(1),
        CountersAggregateInterval = TimeSpan.FromMinutes(5),
        PrepareSchemaIfNecessary = true,
        DashboardJobListLimit = 50000,
        TransactionTimeout = TimeSpan.FromMinutes(1),
        TablesPrefix = "Hangfire"
    })));

services.AddHangfireServer();

//...

这样你只需要根据需要编辑设置文件。

如果选项也需要动态更改，则在设置中添加一个部分来保存所需的选项并在启动中加载它们。

动态制作 HangFire 连接字符串 .Net Core

Make dynamically HangFire connection string .NetCore

c#

linq

hangfire

asp.net-core