本文整理汇总了C#中System.Threading.Tasks.Task.Task构造函数的典型用法代码示例。如果您正苦于以下问题：C# Task构造函数的具体用法？C# Task怎么用？C# Task使用的例子？那么, 这里精选的构造函数代码示例或许可以为您提供帮助。您也可以进一步了解该构造函数所在类System.Threading.Tasks.Task的用法示例。
在下文中一共展示了Task构造函数的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: Main
//引入命名空间
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
public class Example
{
public static async Task Main()
{
var list = new ConcurrentBag<string>();
string[] dirNames = { ".", ".." };
List<Task> tasks = new List<Task>();
foreach (var dirName in dirNames) {
Task t = new Task( () => { foreach(var path in Directory.GetFiles(dirName))
list.Add(path); } );
tasks.Add(t);
t.Start();
}
await Task.WhenAll(tasks.ToArray());
foreach (Task t in tasks)
Console.WriteLine("Task {0} Status: {1}", t.Id, t.Status);
Console.WriteLine("Number of files read: {0}", list.Count);
}
}输出：
Task 1 Status: RanToCompletion Task 2 Status: RanToCompletion Number of files read: 23
示例2: Main
//引入命名空间
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
public class Example
{
public static void Main()
{
var list = new ConcurrentBag<string>();
string[] dirNames = { ".", ".." };
List<Task> tasks = new List<Task>();
foreach (var dirName in dirNames) {
Task t = Task.Run( () => { foreach(var path in Directory.GetFiles(dirName))
list.Add(path); } );
tasks.Add(t);
}
Task.WaitAll(tasks.ToArray());
foreach (Task t in tasks)
Console.WriteLine("Task {0} Status: {1}", t.Id, t.Status);
Console.WriteLine("Number of files read: {0}", list.Count);
}
}输出：
Task 1 Status: RanToCompletion Task 2 Status: RanToCompletion Number of files read: 23
示例3: Main
//引入命名空间
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
public class Example
{
public static async Task Main()
{
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
var files = new List<Tuple<string, string, long, DateTime>>();
var t = new Task(() => { string dir = "C:\\Windows\\System32\\";
object obj = new Object();
if (Directory.Exists(dir)) {
Parallel.ForEach(Directory.GetFiles(dir),
f => {
if (token.IsCancellationRequested)
token.ThrowIfCancellationRequested();
var fi = new FileInfo(f);
lock(obj) {
files.Add(Tuple.Create(fi.Name, fi.DirectoryName, fi.Length, fi.LastWriteTimeUtc));
}
});
}
} , token);
t.Start();
tokenSource.Cancel();
try {
await t;
Console.WriteLine("Retrieved information for {0} files.", files.Count);
}
catch (AggregateException e) {
Console.WriteLine("Exception messages:");
foreach (var ie in e.InnerExceptions)
Console.WriteLine(" {0}: {1}", ie.GetType().Name, ie.Message);
Console.WriteLine("\nTask status: {0}", t.Status);
}
finally {
tokenSource.Dispose();
}
}
}输出：
Exception messages: TaskCanceledException: A task was canceled. Task status: Canceled
示例4: Main
//引入命名空间
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
public class Example
{
public static async Task Main()
{
var tasks = new List<Task>();
Random rnd = new Random();
Object lockObj = new Object();
String[] words6 = { "reason", "editor", "rioter", "rental",
"senior", "regain", "ordain", "rained" };
foreach (var word6 in words6) {
Task t = new Task( (word) => { Char[] chars = word.ToString().ToCharArray();
double[] order = new double[chars.Length];
lock (lockObj) {
for (int ctr = 0; ctr < order.Length; ctr++)
order[ctr] = rnd.NextDouble();
}
Array.Sort(order, chars);
Console.WriteLine("{0} --> {1}", word,
new String(chars));
}, word6);
t.Start();
tasks.Add(t);
}
await Task.WhenAll(tasks.ToArray());
}
}输出：
regain --> irnaeg ordain --> rioadn reason --> soearn rained --> rinade rioter --> itrore senior --> norise rental --> atnerl editor --> oteird