C Sharp
Usage
Regular Expressions
Regex
Reference
using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main ()
{
// Define a regular expression for repeated words.
Regex rx = new Regex(@"\b(?<word>\w+)\s+(\k<word>)\b");
// Define a test string. <br />
string text = "The the quick brown fox fox jumps over the lazy dog dog.";
<br />
// Find match.
Match match = rx.Match(text);
// Iterature through captures
foreach (Capture c in match.captures) {
Console.WriteLine("Captured {c.Value}");
}
}
}
Multithreading
Theadpool
C# has a convenient TheadPool class in the System.Threading namespace.
class TestClass {
static void Main(string[] args) {
int numberOfTasks = 10;
int tasksRemaining = 10;
// This is similar to a mutex.
ManualResetEvent finishedHandle = new ManualResetEvent(false);
for (int i = 0; i < numberOfTasks; i++) {
// Note that you cannot reuse i here.
// You can use this trick to put it in a closure
// Or you can make a closure manually with another anonymous function
// i.e. (a => { return _=>{ \\ Do stuff here })(a)
int j = i;
ThreadPool.QueueUserWorkItem(_ => {
try {
// Do something time consuming or resource intensive.
// Do not use i here. You can use j instead.
} catch (System.Exception e) {
// Print Stack Trace
} finally {
if (Interlocked.Decrement(ref tasksRemaining) == 0) {
finishedHandle.Set();
}
}
});
}
// Blocking wait.
finishedHandle.WaitOne();
}
}
Platform Invoke
Reference
Platform Invoke (or P/Invoke) allows you to call and use C and C++ libraries from within your C# or other .NET programs.