本文整理汇总了C#中System.Threading.Tasks.Task<TResult>.ContinueWith方法的典型用法代码示例。如果您正苦于以下问题：C# Task<TResult>.ContinueWith方法的具体用法？C# Task<TResult>.ContinueWith怎么用？C# Task<TResult>.ContinueWith使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Threading.Tasks.Task<TResult>的用法示例。
在下文中一共展示了Task<TResult>.ContinueWith方法的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.Generic;
using System.Threading;
using System.Threading.Tasks;
using Timers = System.Timers;
public class Example
{
static CancellationTokenSource ts;
public static void Main(string[] args)
{
int upperBound = args.Length >= 1 ? Int32.Parse(args[0]) : 200;
ts = new CancellationTokenSource();
CancellationToken token = ts.Token;
Timers.Timer timer = new Timers.Timer(3000);
timer.Elapsed += TimedOutEvent;
timer.AutoReset = false;
timer.Enabled = true;
var t1 = Task.Run(() => { // True = composite.
// False = prime.
bool[] values = new bool[upperBound + 1];
for (int ctr = 2; ctr <= (int) Math.Sqrt(upperBound); ctr++) {
if (values[ctr] == false) {
for (int product = ctr * ctr; product <= upperBound;
product = product + ctr)
values[product] = true;
}
token.ThrowIfCancellationRequested();
}
return values; }, token);
var t2 = t1.ContinueWith( (antecedent) => { // Create a list of prime numbers.
var primes = new List<int>();
token.ThrowIfCancellationRequested();
bool[] numbers = antecedent.Result;
string output = String.Empty;
for (int ctr = 1; ctr <= numbers.GetUpperBound(0); ctr++)
if (numbers[ctr] == false)
primes.Add(ctr);
// Create the output string.
for (int ctr = 0; ctr < primes.Count; ctr++) {
token.ThrowIfCancellationRequested();
output += primes[ctr].ToString("N0");
if (ctr < primes.Count - 1)
output += ", ";
if ((ctr + 1) % 8 == 0)
output += Environment.NewLine;
}
//Display the result.
Console.WriteLine("Prime numbers from 1 to {0}:\n",
upperBound);
Console.WriteLine(output);
}, token);
try {
t2.Wait();
}
catch (AggregateException ae) {
foreach (var e in ae.InnerExceptions) {
if (e.GetType() == typeof(TaskCanceledException))
Console.WriteLine("The operation was cancelled.");
else
Console.WriteLine("ELSE: {0}: {1}", e.GetType().Name, e.Message);
}
}
finally {
ts.Dispose();
}
}
private static void TimedOutEvent(Object source, Timers.ElapsedEventArgs e)
{
ts.Cancel();
}
}
// If cancellation is not requested, the example displays output like the following:
// Prime numbers from 1 to 400:
//
// 1, 2, 3, 5, 7, 11, 13, 17,
// 19, 23, 29, 31, 37, 41, 43, 47,
// 53, 59, 61, 67, 71, 73, 79, 83,
// 89, 97, 101, 103, 107, 109, 113, 127,
// 131, 137, 139, 149, 151, 157, 163, 167,
// 173, 179, 181, 191, 193, 197, 199, 211,
// 223, 227, 229, 233, 239, 241, 251, 257,
// 263, 269, 271, 277, 281, 283, 293, 307,
// 311, 313, 317, 331, 337, 347, 349, 353,
// 359, 367, 373, 379, 383, 389, 397, 401
// If cancellation is requested, the example displays output like the following:
// The operation was cancelled.示例2: Main
//引入命名空间
using System;
using System.Threading;
using System.Threading.Tasks;
public class Example
{
public static void Main()
{
var cts = new CancellationTokenSource();
var token = cts.Token;
// Get an integer to generate a list of its exponents.
var rnd = new Random();
var number = rnd.Next(2, 21);
var t = Task.Factory.StartNew( (value) => { int n = (int) value;
long[] values = new long[10];
for (int ctr = 1; ctr <= 10; ctr++)
values[ctr - 1] = (long) Math.Pow(n, ctr);
return values;
}, number);
var continuation = t.ContinueWith( (antecedent, value) => { Console.WriteLine("Exponents of {0}:", value);
for (int ctr = 0; ctr <= 9; ctr++)
Console.WriteLine(" {0} {1} {2} = {3:N0}",
value, "\u02C6", ctr + 1,
antecedent.Result[ctr]);
Console.WriteLine();
}, number);
continuation.Wait();
cts.Dispose();
}
}输出：
Exponents of 2: 2 ^ 1 = 2 2 ^ 2 = 4 2 ^ 3 = 8 2 ^ 4 = 16 2 ^ 5 = 32 2 ^ 6 = 64 2 ^ 7 = 128 2 ^ 8 = 256 2 ^ 9 = 512 2 ^ 10 = 1,024
示例3: Main
//引入命名空间
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
public class Example
{
public static void Main(string[] args)
{
int upperBound = args.Length >= 1 ? Int32.Parse(args[0]) : 200;
var t1 = Task.Run(() => { // True = composite.
// False = prime.
bool[] values = new bool[upperBound + 1];
for (int ctr = 2; ctr <= (int) Math.Sqrt(upperBound); ctr++) {
if (values[ctr] == false) {
for (int product = ctr * ctr; product <= upperBound;
product = product + ctr)
values[product] = true;
}
}
return values; });
var t2 = t1.ContinueWith( (antecedent) => { // Create a list of prime numbers.
var primes = new List<int>();
bool[] numbers = antecedent.Result;
string output = String.Empty;
for (int ctr = 1; ctr <= numbers.GetUpperBound(0); ctr++)
if (numbers[ctr] == false)
primes.Add(ctr);
// Create the output string.
for (int ctr = 0; ctr < primes.Count; ctr++) {
output += primes[ctr].ToString("N0");
if (ctr < primes.Count - 1)
output += ", ";
if ((ctr + 1) % 8 == 0)
output += Environment.NewLine;
}
//Display the result.
Console.WriteLine("Prime numbers from 1 to {0}:\n",
upperBound);
Console.WriteLine(output);
});
try {
t2.Wait();
}
catch (AggregateException ae) {
foreach (var e in ae.InnerExceptions)
Console.WriteLine("{0}: {1}", e.GetType().Name, e.Message);
}
}
}输出：
Prime numbers from 1 to 400: 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401
示例4: DoWork
//引入命名空间
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
// Demonstrates how to associate state with task continuations.
class ContinuationState
{
// Simluates a lengthy operation and returns the time at which
// the operation completed.
public static DateTime DoWork()
{
// Simulate work by suspending the current thread
// for two seconds.
Thread.Sleep(2000);
// Return the current time.
return DateTime.Now;
}
static void Main(string[] args)
{
// Start a root task that performs work.
Task<DateTime> t = Task<DateTime>.Run(delegate { return DoWork(); });
// Create a chain of continuation tasks, where each task is
// followed by another task that performs work.
List<Task<DateTime>> continuations = new List<Task<DateTime>>();
for (int i = 0; i < 5; i++)
{
// Provide the current time as the state of the continuation.
t = t.ContinueWith(delegate { return DoWork(); }, DateTime.Now);
continuations.Add(t);
}
// Wait for the last task in the chain to complete.
t.Wait();
// Print the creation time of each continuation (the state object)
// and the completion time (the result of that task) to the console.
foreach (var continuation in continuations)
{
DateTime start = (DateTime)continuation.AsyncState;
DateTime end = continuation.Result;
Console.WriteLine("Task was created at {0} and finished at {1}.",
start.TimeOfDay, end.TimeOfDay);
}
}
}
/* Sample output:
Task was created at 10:56:21.1561762 and finished at 10:56:25.1672062.
Task was created at 10:56:21.1610677 and finished at 10:56:27.1707646.
Task was created at 10:56:21.1610677 and finished at 10:56:29.1743230.
Task was created at 10:56:21.1610677 and finished at 10:56:31.1779883.
Task was created at 10:56:21.1610677 and finished at 10:56:33.1837083.
*/