All my posts are provided "AS IS" with no warranties, and confer no rights.
01/02/2010 Leave a comment
An example of Flag struct that using interger and set by bits
public struct BitFlagVector32
{
private int data;
public BitFlagVector32(int data)
{
this.data = data;
}
public int IntegerValue
{
get
{
return this.data;
}
set
{
this.data = value;
}
}
public bool this[int bit]
{
get
{
return ((this.data & bit) == bit);
}
set
{
int data = this.data;
if (value)
{
this.data = data | bit;
}
else
{
this.data = data & ~bit;
}
}
}
public void Set(int bit)
{
this.data |= bit;
}
public void Clear(int bit)
{
this.data &= ~bit;
}
}
public static class UsageClass
{
public static BitFlagVector32 flag = new BitFlagVector32(15);
public static void Usage()
{
flag.Clear(0x00); //No effect
flag.Clear(0x01); //value 14 00001110
flag.Clear(0x02); //value 12 00001100
flag.Clear(0x04); //value 8 00001000
flag.Clear(0x08); //value 0 00000000
flag.Set(0); //No effect
flag.Set(0x01); //value 0 00000001
flag.Set(0x02); //value 0 00000011
flag.Set(0x04); //value 0 00000111
flag.Set(0x08); //value 0 00001111
}
}
...
28/01/2010 Leave a comment
using System;
using System.Threading;
using System.Windows.Forms;
using System.Net.NetworkInformation;
namespace ContextHelper
{
static class Pinger
{
public static void Ping(string url_or_IP)
{
using (Ping ping = new Ping())
{
try
{
Console.Write(" {0}...", url_or_IP);
PingReply reply = ping.Send(url_or_IP, 100);
if (reply.Status == IPStatus.Success)
{
Console.WriteLine("Success - IP Address:{0}", reply.Address, reply.RoundtripTime);
}
else
{
Console.WriteLine(reply.Status);
}
}
catch (Exception ex)
{
Console.WriteLine("Error ({0})",
ex.InnerException.Message);
}
}
}
}
}
28/01/2010 Leave a comment
Some times you want one running instance for your application then you can deny another running instance with this code.
using System;
using System.Threading;
using System.Windows.Forms;
namespace MyApp
{
static class Program
{
static Mutex _Mutex = null;
[STAThread]
static void Main()
{
bool myAppFirstInstance;
_Mutex = new Mutex(true, "Global\\MyApp ", out myAppFirstInstance);
if (myAppFirstInstance)
Application.Run(new MainForm());
else
MessageBox.Show("There is already exists a running instance of this application",
"Warning",
MessageBoxButtons.OK, MessageBoxIcon.Exclamation, MessageBoxDefaultButton.Button1);
}
}
}
27/01/2010 Leave a comment
In C#, use as, not is. The is keyword is used to see whether a reference can be cast as particular type, but it doesn’t return a reference converted to that type. So usually, if you get a positive result from the is, the first thing you’ll do is a cast—effectively implementing the same cast twice. With the as keyword, a reference cast as the new type is returned if it’s valid and a null is returned if it’s not. You then can check for the null and do what you like. The asapproach is fully 50% faster than the is approach.
Bugra Postaci's Blog 