‘as’ versus type casting

Prefix casting vs as casting

Stopwatch s = new Stopwatch();
            s.Start();
            for (int i = 0; i < 100000000; i++)
            {
                object myClass = new CNDSegment();
                ((CNDSegment)myClass).Method1();
            }
            s.Stop();
            Console.WriteLine(String.Format("Time taken by prefix casting is {0} milliseconds", s.ElapsedMilliseconds));
            s.Reset();
            s.Start();
            for (int i = 0; i < 100000000; i++)
            {
                object myClass = new CNDSegment();
                (myClass as CNDSegment).Method1();
            }
            s.Stop();
            Console.WriteLine(String.Format("Time taken by as casting and typeof method {0} milliseconds", s.ElapsedMilliseconds));

            Console.ReadLine();

Time taken by prefix casting is 1406 milliseconds
Time taken by as casting and typeof method 1338 milliseconds

Read this:
http://www.codeproject.com/Articles/8052/Type-casting-impact-over-execution-performance-in#_rating
http://gen5.info/q/2008/06/13/prefix-casting-versus-as-casting-in-c/

Comments

Post a Comment

Popular posts from this blog

Convert XElement to DataTable

public DataTable XElementToDataTable(XElement x)  {    DataTable dt = new DataTable();   XElement setup = (from p in x.Descendants() select p).First();    foreach (XElement xe in setup.Descendants()) // build your DataTable      dt.Columns.Add(new DataColumn(xe.Name.ToString(),typeof(string))); // add columns to your dt   var all = from p in x.Descendants(setup.Name.ToString()) select p;    foreach (XElement xe in all)    {      DataRow dr = dt.NewRow();      foreach (XElement xe2 in xe.Descendants())        dr[xe2.Name.ToString()] = xe2.Value; //add in the values      dt.Rows.Add(dr);    }    return dt;  }
Read more

Enable mouse scroll-wheel in VB6

VB6 would let us use the mouse scroll-wheel like later versions of VS does. Here's a add-in for VB6 that I have used that does just that! Download  \ Visual Basic 6\vb6mousewheel\VB6MOU~1   from Microsoft web site ·          Copy the VB6IDEMouseWheelAddin.dll to somewhere on your local machine where it won’t get deleted. I use “C:\Program Files\Microsoft Visual Studio 6”. ·          Click Start, click Run, type regsvr32 \VB6IDEMouseWheelAddin.dll, and then click OK. ·          Start Visual Basic 6.0. ·          Click Add-Ins, and then click Add-in Manager. ·          In the Add-in Manager list, click MouseWheel Fix. ·          Click to select the Loaded/Unloaded check box, and then click to select the Load on Startup check box. ·          Click OK.
Read more

C# code to Check IE Proxy Settings

private static void CheckIEProxySettings() {     string strFileURL = " http://programmersvision.blogspot.in ";     HttpWebRequest WebReqt = (HttpWebRequest)HttpWebRequest.Create(strFileURL);     WebProxy WP = new WebProxy(WebReqt.Proxy.GetProxy(new Uri(strFileURL)));     WP.Credentials = CredentialCache.DefaultCredentials;     Console.WriteLine(WP.Address);     // or use this method     //CheckForProxy(new Uri(" http://http://programmersvision.blogspot.in ")); } private static void CheckForProxy(Uri resource) {     WebProxy proxy = (WebProxy)WebProxy.GetDefaultProxy();     Uri proxyUri = proxy.GetProxy(resource);     if (proxyUri == resource)     {         Console.WriteLine("There is no proxy for {0}", resource);     }     else     {         Console.WriteLine("Proxy for {0} is {1}", resource, proxyUri.ToString());     } }
Read more