标签:Console students Age watch LINQ 查询 WriteLine var PLINQ
PLINQ查询和LINQ查询也就是并行和串行的区别:
基本类:
public class Student
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public DateTime CreateTime { get; set; }
}
具体实现演变:
public partial class Program
{
private static void Sample04()
{
//线程安全字典
var students = new ConcurrentDictionary<int, Student>();
// 并行生成1000万条数据
Parallel.For(0, 10_000_000, (i) =>
{
var single = new Student
{
Id = i,
Name = "name" + i,
Age = i % 100,
CreateTime = DateTime.Now.AddSeconds(i)
};
students.TryAdd(i, single);
});
Console.WriteLine("数据已生成");
// PLINQ查询
var watch = new Stopwatch();
watch.Start();
var query1 = (from n in students.Values.AsParallel()
where n.Age > 18 && n.Age < 80
select n).ToList();
watch.Stop();
Console.WriteLine("PLINQ耗时:{0}", watch.ElapsedMilliseconds);
// LINQ查询
watch.Restart();
var query2 = (from n in students.Values
where n.Age > 18 && n.Age < 80
select n).ToList();
watch.Stop();
Console.WriteLine("LINQ耗时:{0}", watch.ElapsedMilliseconds);
}
private static void LinqTread()
{
var students = new ConcurrentDictionary<int, Student>();
Parallel.For(0, 10, (i) =>
{
var single = new Student
{
Id = i,
Name = "name" + i,
Age = i % 100,
CreateTime = DateTime.Now.AddSeconds(i)
};
students.TryAdd(i, single);
});
Console.WriteLine("数据生成结束");
// 测试PLNQ与LINQ查询
var query = from n in students.Values.AsParallel()
select new {Name = n.Name, ThreadId = Thread.CurrentThread.ManagedThreadId};
foreach (var o in query)
{
Console.WriteLine($"{o} - from ThreadId = {Thread.CurrentThread.ManagedThreadId}");
}
Console.WriteLine($"CurrentThreadId:{Thread.CurrentThread.ManagedThreadId}");
}
}
标签:Console,students,Age,watch,LINQ,查询,WriteLine,var,PLINQ 来源: https://www.cnblogs.com/gibschen/p/15767268.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。