Programming Articles - Page 3085 of 3363

Let’s say the following is the string −StringBuilder str = new StringBuilder("Patience is key!");To remove whitespace, you can use the replace method.str.Replace(" ", "");Let us see the complete code.Example Live Demousing System; using System.Text; class Demo {    static void Main() {       // Initial String       StringBuilder str = new StringBuilder("Patience is key!");       Console.WriteLine(str.ToString());       // Replace       str.Replace(" ", "");       // New String       Console.WriteLine(str.ToString());       Console.ReadLine();    } }OutputPatience is key! Patienceiskey!

To handle File Paths in C#, use the Path methods. These methods come under System.IO Namespace.Some of them are −GetExtensionRetrieve the extension of the file using the GetExtension() method.For example, .txt, .dat, etc.GetFileNameRetrieve the name of the file using the GetFileName() method.For example, new.txt, details.dat, etc.GetFileNameWithoutExtensionRetrieve the name of the file without extension using the GetFileNameWithoutExtension() method.For example, new, details, etc.Let us see an example −Example Live Demousing System.IO; using System; class Program {    static void Main() {       string myPath = "D:\one.txt";       string fileExtension = Path.GetExtension(myPath);       string fileName = Path.GetFileName(myPath);   ... Read More

Set an array.int[] array = new int[] { 50, 100, 150, 200, 250, 300, 350, 400 };Now, if you will print this array using a loop and new line, then the arrays will be visible vertically.To work it horizontally, use the Join() method and set spaces to separate array elements.string.Join(" ", array)Let us see the complete code.Example Live Demousing System; using System.Linq; using System.IO; class Program {    static void Main() {       int[] array = new int[] { 50, 100, 150, 200, 250, 300, 350, 400 };       Console.WriteLine(string.Join(" ", array));    } }Output50 100 150 200 250 300 350 400

Firstly, set a list and add elements.List myList = new List(); myList.Add("Jennings"); myList.Add("James"); myList.Add("Chris");Let’s say you need to delete the element “James” now. For that, use the Remove() method.myList.Remove("James");Here is the complete code.Example Live Demousing System.Collections.Generic; using System; class Program {    static void Main() {       List myList = new List();       myList.Add("Jennings");       myList.Add("James");       myList.Add("Chris");       Console.WriteLine("Initial List...");       foreach(string str in myList) {          Console.WriteLine(str);       }       myList.Remove("James");       Console.WriteLine("New List...");     ... Read More

Let’s say you have a ValueTuple and would like to convert it to a tuple, then use the ToTuple() method.With C#, we can easily convert a ValueTuple to a Tuple using ToTuple() method.Note − Add System.ValueTuple package to run ValueTuple program.Let’s see how to add it −Go to your projectRight click on the project in the solution explorerSelect “Manage NuGet Packages”You will reach the NuGet Package Manager.Now, click the Browse tab and find “ValueTuple”Finally, add System.ValueTuple packageLet us see an example to implement ToTuple() method.Exampleusing System; class Program {    static void Main() {       var val = ... Read More

If a File you are trying to find does not exist, then FileNotFoundException occurs.Here, we are try to find a file that does not exist using StreamReader() method.reader = new StreamReader("new.txt"))To read it we have used the following method −reader.ReadToEnd();Let us see the complete code.Exampleusing System.IO; using System; class Program {    static void Main() {       using (StreamReader reader = new StreamReader("new.txt")) {          reader.ReadToEnd();       }    } }The above code will generate the following exception since the file “new.txt” does not exist.Unhandled Exception: System.IO.FileNotFoundException: Could not find file …

If a directory you are trying to find does not exist, then DirectoryNotFoundException occurs.Here, we are try to find a directory that does not exist using GetDirectories() method.Exampleusing System.IO; using System; class Program {    static void Main() {       Directory.GetDirectories("D:ew\");    } }The above code will generate the following exception since the directory “D:ew” does not exist.Unhandled Exception: System.IO.DirectoryNotFoundException: Could not find a part of the path

Declare an array and add elements.int[] val = { 5, 8, 15, 25, 40, 55, 80, 100 };Now, use the Queryable Last() method to get the last element.val.AsQueryable().Last();Let us see the complete code.Example Live Demousing System; using System.Collections.Generic; using System.Linq; class Demo {    static void Main() {       int[] val = { 5, 8, 15, 25, 40, 55, 80, 100 };       int last_num = val.AsQueryable().Last();       Console.WriteLine("Last element: "+last_num);    } }OutputLast element: 100

Set the string.StringBuilder str = new StringBuilder("Tom Hanks");Now, use the replace() method to replace whitespace with String. Empty. This will eventually remove the whitespace.str.Replace(" ", String.Empty);Let us see the complete code −Example Live Demousing System; using System.Text; class Demo {    static void Main() {       StringBuilder str = new StringBuilder("Tom Hanks");       Console.WriteLine(str.ToString());       str.Replace(" ", String.Empty);       Console.WriteLine(str.ToString());       Console.ReadLine();    } }OutputTom Hanks TomHanks

The following is our string −string myStr = "5";To check whether the above is a string with numeric representation, use TryParse and out.int.TryParse(myStr, out a);Here is the complete code.Example Live Demousing System.IO; using System; class Program {    static void Main() {       bool res;       int a;       string myStr = "5";       // checking for valid string representation of a number       res = int.TryParse(myStr, out a);       Console.WriteLine(res);    } }OutputTrue