в 15:31, 26 мая 2010

2010-05-26T15:31:18Z

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2010-05-26T11:39:41Z

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==Async Delegate Invocation==

<source lang="csharp">
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
public delegate int BinaryOp(int x, int y);
class Program {
static void Main(string[] args) {
BinaryOp b = new BinaryOp(Add);
IAsyncResult iftAR = b.BeginInvoke(10, 10, null, null);
while (!iftAR.AsyncWaitHandle.WaitOne(2000, true)) {
Console.WriteLine("Doing more work in Main()!");
}
int answer = b.EndInvoke(iftAR);
Console.WriteLine("10 + 10 is {0}.", answer);
}
static int Add(int x, int y) {
Console.WriteLine("Add() invoked on thread {0}.", Thread.CurrentThread.GetHashCode());
Thread.Sleep(5000);
return x + y;
}
}
</source>

==Async Delegates Callback==

<source lang="csharp">
using System;
using System.Threading;

class AsyncDelegatesCallback
{
public static int Add(int op1, int op2, out int result)
{
Thread.Sleep(1000);
return (result = op1 + op2);
}
public delegate int AddDelegate(int op1, int op2,
out int result);

public static void AnnounceSum(IAsyncResult iar)
{
AddDelegate add = (AddDelegate)iar.AsyncState;

int result;
add.EndInvoke(out result, iar);

Console.WriteLine("[AnnounceSum] The result is {0}", result);
}

static void Main()
{
int result;
AddDelegate add = new AddDelegate(Add);
add.BeginInvoke(6, 42, out result, new AsyncCallback(AnnounceSum), add);

Thread.Sleep(1000);
}
}
</source>

==delegate BeginInvoke of IAsyncResult==

<source lang="csharp">
using System;
using System.Threading;

class AsyncDelegatesBlocked
{
public static int Add(int op1, int op2, out int result)
{
Thread.Sleep(3000);
return (result = op1 + op2);
}
public delegate int AddDelegate(int op1, int op2,out int result);

static void Main()
{
int result;
AddDelegate add = new AddDelegate(Add);

IAsyncResult iAR = add.BeginInvoke(6, 42, out result,null, null);

for (int i = 0; i < 10; i++)
{
Thread.Sleep(200);
Console.Write(".");
}
iAR.AsyncWaitHandle.WaitOne();
add.EndInvoke(out result, iAR);

Console.WriteLine("[Main] The result is {0}", result);
}
}
</source>

==What happens if an unhandled exception is raised in a multicast delegate?==

<source lang="csharp">
using System;
using System.Threading;

public delegate void DelegateClass();
public class Starter {
public static void Main() {
try {
DelegateClass del = MethodA;
IAsyncResult ar = del.BeginInvoke(null, null);
del.EndInvoke(ar);
} catch (Exception except) {
Console.WriteLine("Exception caught: "+ except.Message);
}
}
public static void MethodA() {
if (Thread.CurrentThread.IsThreadPoolThread == true) {
Console.WriteLine("Running on a thread pool thread");
} else {
Console.WriteLine("Running on primary thread");
}
throw new Exception("failure");
}
}
</source>

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Csharp/C Sharp/Language Basics/Delegate Async - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия