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This article is to share with you about what C# programming skills are. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

One of the C # programming skills, minimizing windows

Minimize the window when clicking "X" or "Alt+F4"

Such as:

Protected override void WndProc (ref Message m) {const int WM_SYSCOMMAND = 0x0112; const int SC_CLOSE = 0xF060; if (m.Msg = = WM_SYSCOMMAND & & (int) m.WParam = = SC_CLOSE) {/ / User clicked close button this.WindowState = FormWindowState.Minimized; return;} base.WndProc (ref m);}

Second, how to make the Foreach loop run faster

Foreach is a ready-made statement that simply enumerates and manipulates the elements in the collection, as shown in the following example:

Using System; using System.Collections; namespace LoopTest {class Class1 {static void Main (string [] args) {/ / create an ArrayList of strings ArrayList array = new ArrayList (); array.Add ("Marty"); array.Add ("Bill"); array.Add ("George"); / / print the value of every item foreach (string item in array) {Console.WriteLine (item);}

You can use foreach statements in each collection that implements the Ienumerable interface. If you want to know more about the use of foreach, you can check out the C # Language Specification in the .NET Framework SDK documentation.

At compile time, the C # editor converts each foreach region.

IEnumerator enumerator = array.GetEnumerator (); try {string item; while (enumerator.MoveNext ()) {item = (string) enumerator.Current; Console.WriteLine (item);} finally {IDisposable d = enumerator as IDisposable; if (d! = null) d.Dispose ();}

This shows that in the background, the management of foreach will bring some extra code to your program to increase the system overhead.

C # programming skill 3. Save the picture to a XML file

In the resource file of WinForm, the non-text contents such as the Image attribute of PictureBox are converted into text storage, which is realized by Serialization.

Example:

Using System.Runtime.Serialization.Formatters.Soap; Stream stream = new FileStream ("E:\\ Image.XML", FileMode.Create,FileAccess.Write,FileShare.None); SoapFormatter f = new SoapFormatter (); Image img = Image.FromFile ("E:\\ Image.bmp"); f.Serialize (stream,img); stream.Close ()

C # programming skills IV. Block CTRL-V

The TextBox control in WinForm has no way to block the clipboard paste action of CTRL-V. If you need an input box but do not want the user to paste the contents of the clipboard, you can use the RichTextBox control instead and block the CTRL-V key in KeyDown, for example:

Private void richTextBox1_KeyDown (object sender, System.Windows.Forms.KeyEventArgs e) {if (e.Control & & e.KeyCode==Keys.V) e.Handled = true;}

C # programming skills 5. Judge whether a file or folder exists.

With System.IO.File, it is very simple to check whether a file exists:

Bool exist = System.IO.File.Exists (fileName)

If you need to determine whether a directory (folder) exists, you can use System.IO.Directory:

Bool exist = System.IO.Directory.Exists (folderName)

C # programming skills VI. Use delegate types to design custom events

In C # programming, any Class except Method and Property can have its own Event. The steps to define and use custom events are as follows:

(1) define a delegate type outside Class to determine the interface of the event program

(2) inside Class, declare a public event variable with the type of delegate defined in the previous step

(3) trigger an event somewhere within a Method or Property

(4) use the + = operator to specify the event handler in the Client program

Example: / / define the Delegate type and restrict the parameters of the event program

Public delegate void MyEventHandler (object sender, long lineNumber); public class DataImports {/ / define new event NewLineRead public event MyEventHandler NewLineRead; public void ImportData () {long I = 0; / / event parameter while () {ionization +; / / trigger event if (NewLineRead! = null) NewLineRead (this, I) / /.} / / the following is the Client code private void CallMethod () {/ / declare the Class variable without WithEvents private DataImports _ da = null; / / specify the event handler _ da.NewLineRead + = new MyEventHandler (this.DA_EnterNewLine); / / call the Class method, and the event _ da.ImportData () will be triggered on the way. } / / event handler private void DA_EnterNewLine (object sender, long lineNumber) {/ /...}

C # programming skills VII. IP and hostname parsing

Using System.Net, you can implement IP resolution functions similar to the Ping command line, such as resolving hostnames to IP or vice versa:

Private string GetHostNameByIP (string ipAddress) {IPHostEntry hostInfo = Dns.GetHostByAddress (ipAddress); return hostInfo.HostName;} private string GetIPByHostName (string hostName) {System.Net.IPHostEntry hostInfo = Dns.GetHostByName (hostName); return hostInfo.AddressList [0] .ToString ();} Thank you for reading! This is the end of this article on "what are the C# programming skills?". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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