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Filter a collection on the basis of each of its elements type.Let’s say you have the following list with integer and string elements −list.Add("Katie"); list.Add(100); list.Add(200);To filter collection and get only elements with string type.var myStr = from a in list.OfType() select a;Work the same for integer type.var myInt = from a in list.OfType() select a;The following is the complete code −Example Live Demousing System; using System.Linq; using System.Collections; public class Demo { public static void Main() { IList list = new ArrayList(); list.Add("Katie"); list.Add(100); list.Add(200); ... Read More
Use File.Delete method to delete a file.Firstly, set the path of the file you want to delete.String myPath = @"C:\New\amit.txt";Now, use the File.Delete method to delete the file.File.Delete(myPath);The following is the complete code −Example Live Demousing System; using System.IO; public class Program { public static void Main() { String myPath = @"C:\New\amit.txt"; Console.WriteLine("Deleting File"); File.Delete(myPath); } }OutputDeleting File
Use File.Copy method to make copy of an existing file.Add the path of the file you want to copy.String myPath = @"D:\one.txt";Now copy the above file to the following file −String myPath = @"D:\one.txt";Use the File.Copy method with both the source and destination file.File.Copy(myPath,newpath);Exampleusing System; using System.IO; public class Program { public static void Main() { String myPath = @"D:\one.txt"; // the file will get copied here String newpath = @"D:\two.txt"; // copying file File.Copy(myPath,newpath); } }
If any of the following string appears in the format string and followed by at least one zero, then the number is formatted with an “E” or “e” in between the number and the exponent."E" "E+" "E-" "e" "e+" "e-"Example Live Demousing System; using System.Globalization; class Demo { static void Main() { double num = 9400; Console.WriteLine(num.ToString("0.###E+0", CultureInfo.InvariantCulture)); Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:0.###E+0}", num)); Console.WriteLine(num.ToString("0.###E+000", CultureInfo.InvariantCulture)); Console.WriteLine(String.Format(CultureInfo.InvariantCulture, "{0:0.###E+000}", num)); } }Output9.4E+3 9.4E+3 9.4E+003 9.4E+003
Firstly, set a LinkedList with nodes.string [] students = {"Tim", "Jack", "Henry", "David", "Tom"}; LinkedList list = new LinkedList(students);To add a node at the first position, use the AddFirst() method.list.AddFirst("Amit");Example Live Demousing System; using System.Collections.Generic; class Demo { static void Main() { string [] students = {"Tim", "Jack", "Henry", "David", "Tom"}; LinkedList list = new LinkedList(students); foreach (var stu in list) { Console.WriteLine(stu); } // adding a node Console.WriteLine("LinkedList after adding a node at the first position..."); ... Read More
This method returns true if the entered string has only whitespace characters or is null.Let say you checked for null value −bool val1 = string.IsNullOrWhiteSpace(null);The above returns True, since the string is “null”. In the same way, check it for whitespace character.Here is the entire example that checks for null and whitespace.Example Live Demousing System; using System.IO; public class Demo { public static void Main() { bool val1 = string.IsNullOrWhiteSpace(null); bool val2 = string.IsNullOrWhiteSpace(" "); bool val3 = string.IsNullOrWhiteSpace("5"); Console.WriteLine(val1); Console.WriteLine(val2); Console.WriteLine(val3); } }OutputTrue True False
Set a list.List list = new List { 150, 300, 400, 350, 450, 550, 600 };To get the smallest element, use the Min() method.list.AsQueryable().Min();To get the largest element, use the Max() method.list.AsQueryable().Max();Let us see the complete code −Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { List list = new List { 150, 300, 400, 350, 450, 550, 600 }; foreach(long ele in list){ Console.WriteLine(ele); } // getting largest element long max_num = list.AsQueryable().Max(); ... Read More
Firstly, set a string array.string[] num = { "One", "Two", "Three", "Four", "Five"};Use the Linq LongCount method to get the count of elements.num.AsQueryable().LongCount();Here is the complete code −Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { string[] num = { "One", "Two", "Three", "Four", "Five"}; long res = num.AsQueryable().LongCount(); Console.WriteLine("{0} elements", res); } }Output5 elements
The General Date Long Time standard format specifier is a combination of the short date ("d") and long time ("T") patterns, separated by a space.Set the date −DateTime dt = new DateTime(2018, 1, 3, 3, 45, 20);Now, use the ToString() method and DateTimeFormatInfo.dt.ToString("G", DateTimeFormatInfo.InvariantInfo)Example Live Demousing System; using System.Globalization; class Demo { static void Main() { DateTime dt = new DateTime(2018, 1, 3, 3, 45, 20); Console.WriteLine(dt.ToString("G", DateTimeFormatInfo.InvariantInfo)); } }Output01/03/2018 03:45:20
This IE4 document object model (DOM) introduced in Version 4 of Microsoft's Internet Explorer browser. IE 5 and later versions include support for most basic W3C DOM features.ExampleTo access document properties using W3C DOM method, you can try to run the following code − Document Title This is main title Click the following to see the result: