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Char.ConvertFromUtf32 Method (Int32)


Converts the specified Unicode code point into a UTF-16 encoded string.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

public static string ConvertFromUtf32(
	int utf32


Type: System.Int32

A 21-bit Unicode code point.

Return Value

Type: System.String

A string consisting of one Char object or a surrogate pair of Char objects equivalent to the code point specified by the utf32 parameter.

Exception Condition

utf32 is not a valid 21-bit Unicode code point ranging from U+0 through U+10FFFF, excluding the surrogate pair range from U+D800 through U+DFFF.

Use this method to convert a 21-bit Unicode code point to a UTF-16 encoded string before testing the string with methods such as IsLowSurrogate(Char) and IsHighSurrogate(Char).

A valid code point outside the Basic Multilingual Plane (BMP) always yields a valid surrogate pair. However, a valid code point within the BMP might not yield a valid result according to the Unicode standard because no linguistic processing is used in the conversion. For that reason, use the System.Text.UTF32Encoding class to convert bulk UTF-32 data into bulk UTF-16 data.

The following code example demonstrates the ConvertToUtf32 and ConvertFromUtf32 methods.

// This example demonstrates the Char.ConvertFromUtf32() method
//                           and Char.ConvertToUtf32() overloads.
using System;

class Sample 
    public static void Main() 
    int letterA = 0x0041;  //U+00041 = LATIN CAPITAL LETTER A
    int music   = 0x1D161; //U+1D161 = MUSICAL SYMBOL SIXTEENTH NOTE
    string s1;
    string comment   = "Create a UTF-16 encoded string from a code point.";
    string comment1b = "Create a code point from a UTF-16 encoded string.";
    string comment2b = "Create a code point from a surrogate pair at a certain position in a string.";
    string comment2c = "Create a code point from a high surrogate and a low surrogate code point.";

//  Convert code point U+0041 to UTF-16. The UTF-16 equivalent of 
//  U+0041 is a Char with hexadecimal value 0041.

    s1 = Char.ConvertFromUtf32(letterA);
    Console.Write("    1a) 0x{0:X} => ", letterA);

//  Convert the lone UTF-16 character to a code point.

    letterA = Char.ConvertToUtf32(s1, 0);
    Console.Write("    1b) ");
    Console.WriteLine(" => 0x{0:X}", letterA);

// -------------------------------------------------------------------

//  Convert the code point U+1D161 to UTF-16. The UTF-16 equivalent of 
//  U+1D161 is a surrogate pair with hexadecimal values D834 and DD61.

    s1 = Char.ConvertFromUtf32(music);
    Console.Write("    2a) 0x{0:X} => ", music);

//  Convert the surrogate pair in the string at index position 
//  zero to a code point.

    music = Char.ConvertToUtf32(s1, 0);
    Console.Write("    2b) ");
    Console.WriteLine(" => 0x{0:X}", music);

//  Convert the high and low characters in the surrogate pair into a code point.

    music = Char.ConvertToUtf32(s1[0], s1[1]);
    Console.Write("    2c) ");
    Console.WriteLine(" => 0x{0:X}", music);

    private static void Show(string s)
    for (int x = 0; x < s.Length; x++)
                       ((x == s.Length-1)? String.Empty : ", "));
This example produces the following results:

Create a UTF-16 encoded string from a code point.
    1a) 0x41 => 0x41
Create a code point from a UTF-16 encoded string.
    1b) 0x41 => 0x41

Create a UTF-16 encoded string from a code point.
    2a) 0x1D161 => 0xD834, 0xDD61
Create a code point from a surrogate pair at a certain position in a string.
    2b) 0xD834, 0xDD61 => 0x1D161
Create a code point from a high surrogate and a low surrogate code point.
    2c) 0xD834, 0xDD61 => 0x1D161


Universal Windows Platform
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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