C＃ToUpper（）メソッド

C＃のToUpper（）メソッドは、大文字に変換されたこの文字列のコピーを返すために使用されます。

構文

public string ToUpper ();

例

using System;
public class Demo {
   public static void Main(String[] args) {
      string str1 = "Welcome!";
      string str2 = "Thisisit!";
      char[] arr1 = str1.ToCharArray(3,2);
      char[] arr2 = str2.ToCharArray(2,2);
      Console.WriteLine("String1 = "+str1);
      Console.WriteLine("String1 ToUpper = "+str1.ToUpper());
      Console.WriteLine("String1 Substring from index4 = " + str1.Substring(4, 4));
      Console.Write("Character array...String1 =");
      for (int i = 0; i < arr1.Length; i++)
      Console.Write(" " + arr1[i]);
      Console.WriteLine("\n\nString2 = "+str2);
      Console.WriteLine("String2 ToUpper = "+str2.ToUpper());
      Console.WriteLine("String2 Substring from index2 = " + str2.Substring(0, 5));
      Console.Write("Character array...String2 =");
      for (int i = 0; i < arr2.Length; i++)
      Console.Write(" " + arr2[i]);
   }
}

出力

String1 = Welcome!
String1 ToUpper = WELCOME!
String1 Substring from index4 = ome!
Character array...String1 = c o
String2 = Thisisit!
String2 ToUpper = THISISIT!
String2 Substring from index2 = Thisi
Character array...String2 = i s

例

using System;
using System.Globalization;
public class Demo {
   public static void Main(String[] args) {
      string str1 = "JackSparrow!";
      string str2 = "@#$PQRSTUV!";
      Console.WriteLine("String1 = "+str1);
      Console.WriteLine("String1 ToUpper = "+str1.ToUpper(new CultureInfo("en-US", false)));
      Console.WriteLine("String1 Substring from index4 = " + str1.Substring(2, 2));
      Console.WriteLine("\n\nString2 = "+str2);
      Console.WriteLine("String2 ToUpper = "+str2.ToUpper(new CultureInfo("en-US", false)));
      Console.WriteLine("String2 Substring from index2 = " + str2.Substring(0, 5));
   }
}

出力

String1 = JackSparrow!
String1 ToUpper = JACKSPARROW!
String1 Substring from index4 = ck
String2 = @#$PQRSTUV!
String2 ToUpper = @#$PQRSTUV!
String2 Substring from index2 = @#$PQ