String.ToUpperInvariant Method is used to get a copy of this String object converted to uppercase using the casing rules of the invariant culture. Here “invariant culture” represents a culture that is culture-insensitive.
Syntax:
public string ToUpperInvariant ();
Return Value: The return type of this method is System.String. This method will return a string which is the uppercase equivalent of the current string.
Below given are some examples to understand the implementation in a better way:
Example 1:
// C# program to illustrate // ToUpperInvariant() method using System;
public class GFG {
// Main method
static public void Main()
{
// variables
string strA = "WelCome tO GeeKSfOrGeeKs" ;
string strB;
// Convert strA into lowercase
// using ToLowerInvariant() method
strB = strA.ToUpperInvariant();
// Display string before ToUpperInvariant() method
Console.WriteLine( "String before ToUpperInvariant:" );
Console.WriteLine(strA);
Console.WriteLine();
// Display string after ToUpperInvariant() method
Console.WriteLine( "String after ToUpperInvariant:" );
Console.WriteLine(strB);
}
} |
String before ToUpperInvariant: WelCome tO GeeKSfOrGeeKs String after ToUpperInvariant: WELCOME TO GEEKSFORGEEKS
Example 2:
// C# program to illustrate // ToUpperInvariant() Method using System;
public class GFG {
// Main method
static public void Main()
{
// Calling function
Convert( "GEeks" );
Convert( "geeks" );
Convert( "GEEKS" );
}
static void Convert(String value)
{
// Display strings
Console.WriteLine( "string 1: {0}" , value);
// Convert string into Uppercase
// using ToUpperInvariant() method
value = value.ToUpperInvariant();
// Display the Lowercase strings
Console.WriteLine( "string 2: {0}" , value);
}
} |
string 1: GEeks string 2: GEEKS string 1: geeks string 2: GEEKS string 1: GEEKS string 2: GEEKS
Note:
- The invariant culture represents a culture that is culture-insensitive. It is associated with the English language but not with a specific country or region.
- ToUpperInvariant() method does not modify the value of the current instance. Instead, it returns a new string in which all characters in the current instance are converted to uppercase.
- This method can’t be overloaded if you try to overload this method, it will give you compile time error.
Reference: https://docs.microsoft.com/en-us/dotnet/api/system.string.toupperinvariant?view=netframework-4.7.2