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Csharp Articles
Page 101 of 196
C# program to convert string to long
To convert a string to a long, use the Long.parse method in C# −Firstly, set a string −string str = "6987646475767";Now, convert it to long −long.Parse(str);Here is the complete code −Exampleusing System; using System.Linq; class Demo { static void Main() { string str = "6987646475767"; long res = long.Parse(str); Console.WriteLine(res); } }Output6987646475767
Read MoreSort KeyValuePairs in C#
Use the Sort method to sort the KeyValuePairs collection.Firstly, set the collection −var myList = new List(); // adding elements myList.Add(new KeyValuePair(1, 20)); myList.Add(new KeyValuePair(2, 15)); myList.Add(new KeyValuePair(3, 35)); myList.Add(new KeyValuePair(4, 50)); myList.Add(new KeyValuePair(5, 25));To sort, use the Sort() method. With that, we have used the CompareTo() method to compare values −myList.Sort((x, y) => (y.Value.CompareTo(x.Value)));The following is the complete code −Exampleusing System; using System.Collections.Generic; class Program { static void Main() { var myList = new List(); // adding elements myList.Add(new KeyValuePair(1, 20)); myList.Add(new KeyValuePair(2, 15)); ...
Read MoreKeyNotFoundException in C#
The KeyNotFoundException is thrown when a key you are finding is not available in the Dictionary collection.Let us see an example −Exampleusing System; using System.Collections.Generic; public class Demo { public static void Main() { try { var dict = new Dictionary() { {"TV", "Electronics"}, {"Laptop", "Computers"}, }; Console.WriteLine(dict["Pen Drive"]); } catch (Exception e) { Console.WriteLine(e); } } }The ...
Read MoreC# orderby Keyword
Use the orderby leyword to sort a list in ascending or descending order.The following is the list −List myList = new List(); myList.Add("truck"); myList.Add("bus"); myList.Add("bicycle"); myList.Add("motorbike");Now let us sort the list in descending order −myLen = from element in myList orderby element.Length descending select element;Here is the complete code −Exampleusing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { List myList = new List(); myList.Add("truck"); myList.Add("bus"); myList.Add("bicycle"); myList.Add("motorbike"); var myLen = from element in myList ...
Read MoreGet all drives in C#
Firstly, use GetDrives to get the name of all the drives −var drv = DriveInfo.GetDrives();Loop through to get the name of all the drives on the system −foreach (DriveInfo dInfo in drv) { Console.WriteLine(dInfo.Name); }Let us see the complete code −Exampleusing System; using System.Linq; using System.IO; public class Demo { public static void Main() { var drv = DriveInfo.GetDrives(); foreach (DriveInfo dInfo in drv) { Console.WriteLine(dInfo.Name); } } }Output/etc/resolv.conf /etc/hostname /etc/hosts /run/secrets /home/cg/rootNote: The result will vary on different Operating Systems. The above output ...
Read MoreTakeWhile method in C# ()
With the TakeWhile() method, you can get methods by setting a condition base on Predicate.Firstly, declare and initialize an array −int[] arr = { 25, 40, 65, 70};Now, use the TakeWhile() method and predicate to get all the elements that are less than 30.var val = arr.TakeWhile(ele => ele < 30);Let us see the same example, wherein we have displayed the values less than 30 using Predicate −Exampleusing System; using System.Linq; using System.IO; public class Demo { public static void Main() { int[] arr = { 25, 40, 65, 70}; var val = arr.TakeWhile(ele => ele < 30); foreach (int res in val) { Console.WriteLine(res); } } }Output25
Read MoreAggregate method in C#
Use the Aggregate method in C# to perform mathematical operations such as Sum, Min, Max, Average, etc.Let us see an example to multiply array elements using Aggregate method.Here is our array −int[] arr = { 10, 15, 20 };Now, use Aggregate() method −arr.Aggregate((x, y) => x * y);Here is the complete code −Exampleusing System; using System.Linq; using System.IO; public class Demo { public static void Main() { int[] arr = { 10, 15, 20 }; // Multiplication int res = arr.Aggregate((x, y) => x * y); Console.WriteLine(res); } }Output3000
Read MoreAll Method in C#
The All() extension method is part of the System.Linq namepspace. Using this method, you can check whether all the elements match a certain condition or not.Set an array −int[] arr = { 6, 7, 15, 40, 55 };The following is an example. It checks whether all the elements in the array is greater than and equal to 2 or not −arr.All(element => element > = 2);Here is the complete code −Exampleusing System; using System.Linq; class Program { static void Main() { int[] arr = { 6, 7, 15, 40, 55 }; bool res = arr.All(element => element >= 2); Console.WriteLine(res); } }OutputTrue
Read MoreFind a specific element in a C# List
Set a list −List myList = new List() { 5, 10, 17, 19, 23, 33 };Let us say you need to find an element that is divisible by 2. For that, use the Find() method −int val = myList.Find(item => item % 2 == 0);Here is the complete code −Exampleusing System; using System.Collections.Generic; using System.Linq; class Demo { static void Main() { List myList = new List() { 5, 10, 17, 19, 23, 33 }; Console.WriteLine("List: "); foreach(int i in myList) { Console.WriteLine(i); } int val = myList.Find(item => item % 2 == 0); Console.WriteLine("Element that divides by zero: "+val); } }OutputList: 5 10 17 19 23 33 Element that divides by zero: 10
Read MoreToDictionary 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 ...
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