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Csharp Articles
Page 102 of 196
ToDictionary method in C#
The ToDictionary method is an extension method in C# and converts a collection into Dictionary.Firstly, create a string array −string[] str = new string[] {"Car", "Bus", "Bicycle"};Now, use the Dictionary method to convert a collection to Dictionary −str.ToDictionary(item => item, item => true);Here is the complete code −Exampleusing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { string[] str = new string[] {"Car", "Bus", "Bicycle"}; // key and value under ToDictionary var d = str.ToDictionary(item => item, item => true); foreach (var ele in ...
Read MoreContainsValue in C#
Use the ContainsValue() method in C# to search for a value in a Dictionary.Create a Dictionary and add elements −Dictionary d = new Dictionary(); d.Add("keyboard", "One"); d.Add("mouse", "Two");Now, use the ContainsValue() method to find a particular value −d.ContainsValue("Two");The following is the complete code −Exampleusing System; using System.Collections.Generic; using System.Linq; class Program { static void Main() { Dictionary d = new Dictionary(); d.Add("keyboard", "One"); d.Add("mouse", "Two"); // search for a value Console.WriteLine(d.ContainsValue("Two")); } }OutputTrue
Read MoreCase-insensitive Dictionary in C#
To compare, ignoring case, use the case-insensitive Dictionary.While declaring a Dictionary, set the following property to get case-insensitive Dictionary −StringComparer.OrdinalIgnoreCaseAdd the property like this −Dictionary dict = new Dictionary (StringComparer.OrdinalIgnoreCase);Here is the complete code −Exampleusing System; using System.Collections.Generic; public class Program { public static void Main() { Dictionary dict = new Dictionary (StringComparer.OrdinalIgnoreCase); dict.Add("cricket", 1); dict.Add("football", 2); foreach (var val in dict) { Console.WriteLine(val.ToString()); } // case insensitive dictionary i.e. "cricket" is equal to "CRICKET" Console.WriteLine(dict["cricket"]); Console.WriteLine(dict["CRICKET"]); } }Output[cricket, 1] [football, 2] 1 1
Read MoreC# Program to count the number of lines in a file
Firstly, create a file using StreamWriter class and add content to it −using (StreamWriter sw = new StreamWriter("hello.txt")) { sw.WriteLine("This is demo line 1"); sw.WriteLine("This is demo line 2"); sw.WriteLine("This is demo line 3"); }Now use the ReadAllLines() method to read all the lines. With that, the Length property is to be used to get the count of lines −int count = File.ReadAllLines("hello.txt").Length;Here is the complete code −Exampleusing System; using System.Collections.Generic; using System.IO; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("hello.txt")) { ...
Read MoreC# Program to write an array to a file
Use WriteAllLines method to write an array to a file.Firstly, set a string array −string[] stringArray = new string[] { "one", "two", "three" };Now, use the WriteAllLines method to add the above array to a file −File.WriteAllLines("new.txt", stringArray);Here is the complete code −Exampleusing System.IO; using System; public class Program { public static void Main() { string[] stringArray = new string[] { "one", "two", "three" }; File.WriteAllLines("new.txt", stringArray); using (StreamReader sr = new StreamReader("new.txt")) { string res = sr.ReadToEnd(); Console.WriteLine(res); } } }Outputone two three
Read MoreC# Program to check whether a directory exists or not
Use the Directory. Exists method to check whether a directory exists or not.Let’s say you need to check whether the following directory exists or not −C:\AmitFor that, use the Exists() method −if (Directory.Exists("C:\Amit")) { Console.WriteLine("Directory Amit Exist!"); }The following is the complete code −Exampleusing System.IO; using System; public class Program { public static void Main() { if (Directory.Exists("C:\Amit")) { Console.WriteLine("Directory Amit Exist!"); } else { Console.WriteLine("Directory Amit does not exist!"); } } }OutputDirectory Amit does not exist!
Read MoreC# Program to display the name of the directory
Firstly, use the DirectoryInfo that operates on Directories. The parameter set in it is the file path −DirectoryInfo dir = new DirectoryInfo(@"D:ew");To get the name of the directory, use the Name property −dir.NameThe following is the code to display the name of the directory −Exampleusing System.IO; using System; public class Program { public static void Main() { DirectoryInfo dir = new DirectoryInfo(@"D:ew"); // displaying the name of the directory Console.WriteLine(dir.Name); } }OutputD:ew\
Read MoreC# Program to get information about a file
To get information about a file means to get what all attributes are set for that particular file. For example, a file can be normal, hidden, archived, etc.Firstly, use the FileInfo class −FileInfo info = new FileInfo("hello.txt");Now, use FileAttributes to get information about a file −FileAttributes attr = info.Attributes;The following is the code −Exampleusing System.IO; using System; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("hello.txt")) { sw.WriteLine("This is demo text!"); } FileInfo info = new FileInfo("hello.txt"); FileAttributes attr = info.Attributes; Console.WriteLine(attr); } }OutputNormal
Read MoreC# Program to get the last write time of a file
To get the last write time of a file in C#, use the LastWriteTime() method.For this, use the FileInfo as well as DateTime classes.Create an object of each −FileInfo file = new FileInfo("amit.txt"); DateTime dt = file.CreationTime; dt = file.LastWriteTime;Let us see the complete code −Exampleusing System.IO; using System; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("amit.txt")) { sw.WriteLine("Welcome!"); } FileInfo file = new FileInfo("amit.txt"); // file creation time DateTime dt = file.CreationTime; ...
Read MoreC# Program to get the last access time of a file
To get the last access time of a file in C#, use the LastAccessTime() method.For this, use the FileInfo as well as DateTime classes.Create an object of each −FileInfo file = new FileInfo("new.txt"); DateTime dt = file.CreationTime; dt = file.LastAccessTime;Let us see the complete code −Exampleusing System.IO; using System; public class Program { public static void Main() { using (StreamWriter sw = new StreamWriter("quiz.txt")) { sw.WriteLine("Quizzes!"); } FileInfo file = new FileInfo("quiz.txt"); // last access time DateTime dt = file.LastAccessTime; Console.WriteLine(dt); } }Output9/5/2018 5:21:43 AM
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