Csharp/C Sharp/Data Types/String Format

|{0,10:X}|{1,10}|{2:X}|{3}|

<source lang="csharp"> public class MainClass {

   public static void Main() {
       int i = 250662;
       string s = string.Format("|{0,10:X}|{1,10}|{2:X}|{3}|", i, i, i, i);
   }

}

</source>

{4,4}

<source lang="csharp"> using System; public class MainClass {

   public static void Main() {
       Random rnd = new Random();
       int[,] m = new int[3, 5];
       for (int i = 0; i < m.GetLength(0); i++)
           for (int j = 0; j < m.GetLength(1); j++)
               m[i, j] = rnd.Next(1000);
       for (int i = 0; i < m.GetLength(0); i++)
           Console.WriteLine("{0,4} {1,4} {2,4} {3,4} {4,4}", m[i, 0], m[i, 1], m[i, 2], m[i, 3], m[i, 4]);
   }

}

</source>

Control the width

<source lang="csharp"> using System; public class TestConsoleApp {

   public static void Main(string[] args) {
       Console.WriteLine("\n{0,-10}{1,-3}", "Name", "Salary");
       Console.WriteLine("{0,-10}{1,6}", "Bill", 123456);
       Console.WriteLine("{0,-10}{1,6}", "Polly", 7890);
   }

}

</source>

Fill placeholders using an array of objects.

<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; class Program {

   static void Main(string[] args) {
       object[] stuff = { "Hello", 20.9, 1, "There", "83", 99.99933 };
       Console.WriteLine("The Stuff: {0} , {1} , {2} , {3} , {4} , {5} ", stuff);
       Console.WriteLine("{0}, Number{0}, Number{0}", 9);
   }

}

</source>

Format a string

<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; class Program {

   static void Main(string[] args) {
       int theInt = 90;
       double theDouble = 9.99;
       bool theBool = true;
       Console.WriteLine("Int is: {0}\nDouble is: {1}\nBool is: {2}",theInt, theDouble, theBool);
   }

}

</source>

Format with {0:F}

<source lang="csharp"> using System; using System.Globalization; using System.Text; public class NumParsingApp {

   public static void Main(string[] args) {
       string u = "AA -1,234,567.890  ";
       NumberFormatInfo ni = new NumberFormatInfo();
       ni.CurrencySymbol = "AA";
       double h = Double.Parse(u, NumberStyles.Any, ni);
       Console.WriteLine("h = {0:F}", h);
   }

}

</source>

left justify and align a set of strings to improve the appearance of program output

<source lang="csharp"> using System; class Class1 {

   public static void Main(string[] args) {
       string[] names = {"CA  ","  SA","J      A","SA"," SA "};
       foreach (string s in names) {
           Console.WriteLine("This is the name "{0}" before", s);
       }
       string[] sAlignedNames = TrimAndPad(names);
       foreach (string s in sAlignedNames) {
           Console.WriteLine("This is the name "{0}" afterwards", s);
       }
   }
   public static string[] TrimAndPad(string[] strings) {
       string[] stringsToAlign = new String[strings.Length];
       for (int i = 0; i < stringsToAlign.Length; i++) {
           stringsToAlign[i] = strings[i].Trim();
       }
       int nMaxLength = 0;
       foreach (string s in stringsToAlign) {
           if (s.Length > nMaxLength) {
               nMaxLength = s.Length;
           }
       }
       for (int i = 0; i < stringsToAlign.Length; i++) {
           stringsToAlign[i] =
                 stringsToAlign[i].PadRight(nMaxLength + 1);
       }
       return stringsToAlign;
   }

}

</source>

The comma (,M) determines the field width and justification.

<source lang="csharp"> using System; public class TestConsoleApp {

   public static void Main(string[] args)
   {
     Console.WriteLine(
         "{0,5} {1,5}", 123, 456);      // Right-aligned
     Console.WriteLine(
         "{0,-5} {1,-5}", 123, 456);    // Left-aligned
     Console.WriteLine(
         "{0,-10:D6} {1,-10:D6}", 123, 456);
   }

}

</source>

Use string.Format to format integer

<source lang="csharp"> using System; public class TestConsoleApp {

   public static void Main(string[] args) {
       string s = string.Format("123");
       string t = string.Format("{0}", 123);
       string u = string.Format("{0:D3}", 123);
       Console.WriteLine(s);
       Console.WriteLine(t);
       Console.WriteLine(u);
   }

}

</source>

use the Format() method to format a string

<source lang="csharp"> using System; class MainClass {

   public static void Main() {
       
       float myFloat = 1234.56789f;
       string myString8 = String.Format("{0, 10:f3}", myFloat);
       Console.WriteLine("String.Format(\"{0, 10:f3}\", myFloat) = " + myString8);
   
   }

}

</source>

Use the static String.Format() method to build a new string.

<source lang="csharp"> using System; using System.Collections.Generic; using System.Text; class Program {

   static void Main(string[] args) {
       string formatStr;
       formatStr = String.Format("Don"t you wish you had {0:C} in your account?", 99989.987);
       Console.WriteLine(formatStr);
   }

}

</source>