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The long type represents a 64-bit signed integer.To implicitly convert a 64-bit signed integer to a Decimal, firstly set a long value.long val = 989678876876876;To convert long to decimal, assign the value.dec = val;Let us see another example −Example Live Demousing System; public class Demo { public static void Main() { long val = 76755565656565; decimal dec; Console.WriteLine("Implicit conversion from 64-bit signed integer (long) to Decimal"); dec = val; Console.WriteLine("Decimal : "+dec); } }OutputImplicit conversion from 64-bit signed integer (long) to Decimal Decimal : 76755565656565
Use the SkipWhile() method to skip elements from a sequence as long as the specified condition is true.The following is the array −int[] marks = { 35, 42, 48, 88, 55, 90, 95, 85 };Here is the condition.s => s >= 50As long as the above condition is true, the elements above 50 are skipped as shown below −Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo { public static void Main() { int[] marks = { 35, 42, 48, 88, 55, 90, 95, 85 }; // skips elements above 50 IEnumerable selMarks = marks.AsQueryable().OrderByDescending(s => s).SkipWhile(s => s >= 50); // displays rest of the elements Console.WriteLine("Skipped marks > 60..."); foreach (int res in selMarks) { Console.WriteLine(res); } } }OutputSkipped marks > 60... 48 42 35
The ("E") format specifier converts a number to a string of the following form −"-d.ddd…E+ddd"Or"-d.ddd…e+ddd"Above, "d" is a digit (0-9).Prefix the exponent with an "E" or an "e".Example Live Demousing System; using System.Globalization; class Demo { static void Main() { double d = 3452.7678; Console.WriteLine(d.ToString("E", CultureInfo.InvariantCulture)); Console.WriteLine(d.ToString("E10", CultureInfo.InvariantCulture)); Console.WriteLine(d.ToString("e", CultureInfo.InvariantCulture)); Console.WriteLine(d.ToString("e10", CultureInfo.InvariantCulture)); } }Output3.452768E+003 3.4527678000E+003 3.452768e+003 3.4527678000e+003
The IsDefined method returns true if a given integral value, or its name as a string, is present in a specified enum.The following is our enum −enum Subjects { Maths, Science, English, Economics };The above is initialized by default i.e.Maths = 0, Science = 1, English = 2, Economics = 3Therefore, when we will find 3 using IsDefined(), then it will return True as shown below −Example Live Demousing System; public class Demo { enum Subjects { Maths, Science, English, Economics }; public static void Main() { object ob; ob = 3; Console.WriteLine("{0} = {1}", ob, Enum.IsDefined(typeof(Subjects), ob)); } }Output3 = True
Convert a string representation of number to an integer, using the int.Parse method in C#. If the string cannot be converted, then the int.Parse method returns an exceptionLet’s say you have a string representation of a number.string myStr = "200";Now to convert it to an integer, use the int.Parse(). It will get converted.int.Parse(myStr);Example Live Demousing System.IO; using System; class Program { static void Main() { int res; string myStr = "200"; res = int.Parse(myStr); Console.WriteLine("String is a numeric representation: "+res); } }OutputString is a numeric representation: 200
The Where method filters an array of values based on a predicate.Here, the predicate is checking for elements above 70.Where((n, index) => n >= 70);Example Live Demousing System; using System.Linq; using System.Collections.Generic; public class Demo { public static void Main() { int[] arr = { 10, 30, 20, 15, 90, 85, 40, 75 }; Console.WriteLine("Array:"); foreach (int a in arr) Console.WriteLine(a); // getting elements above 70 IEnumerable myQuery = arr.AsQueryable().Where((n, index) => n >= 70); Console.WriteLine("Elements above 70...:"); foreach (int res in myQuery) Console.WriteLine(res); } }OutputArray: 10 30 20 15 90 85 40 75 Elements above 70...: 90 85 75
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