我要评论项目中需要用到quartz执行定时任务，在此记录一下学习过程。
quartz安装
在vs2022中，通过nuget包管理器安装quartz 3.8.1 ，这是.net 6 依赖的最高版本。
创建定时器任务
1、创建quartzconfigurator
新建quartzconfiguratorextensions类，用于注册触发器和任务，代码如下：
/// <summary>
/// 添加任务和触发器
/// </summary>
/// <typeparam name="t"></typeparam>
/// <param name="quartz"></param>
/// <param name="config"></param>
/// <exception cref="exception"></exception>
public static void addjobandtrigger<t>(this iservicecollectionquartzconfigurator quartz, iconfiguration config) where t : ijob
{
// use the name of the ijob as the appsettings.json key
string jobname = typeof(t).name;
// try and load the schedule from configuration
var configkey = $"quartz:{jobname}";
var cronschedule = config[configkey];
// some minor validation
if (string.isnullorempty(cronschedule))
{
throw new exception($"no quartz.net cron schedule found for job in configuration at {configkey}");
}
// register the job as before
var jobkey = new jobkey(jobname);
quartz.addjob<t>(opts => opts.withidentity(jobkey));
quartz.addtrigger(opts => opts
.forjob(jobkey)
.withidentity(jobname + "-trigger")
.withcronschedule(cronschedule)); // use the schedule from configuration
}
/// <summary>
/// 添加任务和触发器（带参数传递）
/// </summary>
/// <typeparam name="t"></typeparam>
/// <param name="quartz"></param>
/// <param name="config"></param>
/// <param name="keyvaluepairs">需要传递的参数</param>
/// <param name="istriggerjobdatamap">默认通过 工作描述时传递参数</param>
/// <exception cref="exception"></exception>
public static void addjobandtriggerwithparameter<t>(this iservicecollectionquartzconfigurator quartz, iconfiguration config,
idictionary<string, object>? keyvaluepairs = null, bool isjobdetailjobdatamap = true) where t : ijob
{
// use the name of the ijob as the appsettings.json key
string jobname = typeof(t).name;
// try and load the schedule from configuration
var configkey = $"quartz:{jobname}";
var cronschedule = config[configkey];
// some minor validation
if (string.isnullorempty(cronschedule))
{
throw new exception($"no quartz.net cron schedule found for job in configuration at {configkey}");
}
// register the job as before
var jobkey = new jobkey(jobname);
if (keyvaluepairs != null && isjobdetailjobdatamap)
{
switch (isjobdetailjobdatamap)
{
case true:
quartz.addjob<t>(opts => opts
.withidentity(jobkey)
.usingjobdata(new jobdatamap(keyvaluepairs)));
quartz.addtrigger(opts => opts
.forjob(jobkey)
.withidentity(jobname + "-trigger")
.withcronschedule(cronschedule)); // use the schedule from configuration
break;
case false:
quartz.addjob<t>(opts => opts
.withidentity(jobkey));
quartz.addtrigger(opts => opts
.forjob(jobkey)
.withidentity(jobname + "-trigger")
.withcronschedule(cronschedule)
.usingjobdata(new jobdatamap(keyvaluepairs))); // use the schedule from configuration
break;
}
}
else
{
quartz.addjob<t>(opts => opts
.withidentity(jobkey));
quartz.addtrigger(opts => opts
.forjob(jobkey)
.withidentity(jobname + "-trigger")
.withcronschedule(cronschedule)); // use the schedule from configuration
}
}2、在program.cs 中注入服务
builder.services.addquartz(q =>
{
创建计划单元（时间轴，载体）
//stdschedulerfactory schedulerfactory = new stdschedulerfactory();
//var scheduler = await schedulerfactory.getscheduler();
//await scheduler.start();
q.usemicrosoftdependencyinjectionjobfactory();
// register the job, loading the schedule from configuration
q.addjobandtrigger<fromkingdeeworkerjob>(builder.configuration);
});
builder.services.addquartzhostedservice(q => q.waitforjobstocomplete = true);3、创建工作单元workerjob
新建类testworkerjob，并继承ijob，代码如下：
[persistjobdataafterexecution]//在执行完成后，保留jobdatamap数据
[disallowconcurrentexecution]//不允许并发执行，即必须等待上次完成后才能执行下一次
public class testworkerjob : ijob
{
private readonly ilogger<testeworkerjob> _logger;
public testworkerjob(ilogger<testworkerjob> logger)
{
_logger = logger;
}
public task execute(ijobexecutioncontext context)
{
_logger.loginformation(datetime.now +" --- hello world!");
task.delay(50000);
thread.sleep(10000);
return task.completedtask;
}
}假如我们的定时任务，执行一次需要耗时比较久，而且后一次执行需要等待前一次完成，并且需要前一次执行的结果作为参考，那么就需要设置任务的任性。因为默认情况下，工作单元在每一次运行都是一个新的实例，相互之间独立运行，互不干扰。所以如果需要存在一定的关联，就要设置任务的特性，主要有两个，如下所示：
[persistjobdataafterexecution]//在执行完成后，保留jobdatamap数据
[disallowconcurrentexecution]//不允许并发执行，即必须等待上次完成后才能执行下一次
以上两个特性，只需要标记在任务对应的类上即可。
4、appsettings.json配置
在appsettings.json文件中添加一项quartz，子项的必须与workerjob的名字保持一致，value是cron表达式
{
"quartz": {
"fromkingdeeworkerjob": "0/5 * * * * ?"
}
}然后，启动项目，就可以看到任务可以正常运行啦。
最后
最后附上学习链接，
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