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Modernize C# code snippets - System/Char, System/Console #12950

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7d91044
Modernize C# code snippets
gewarren Aug 6, 2026
e86be11
Apply suggestions from code review
gewarren Aug 7, 2026
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18 changes: 10 additions & 8 deletions snippets/csharp/System/Char/CompareTo/compareto.cs
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Original file line number Diff line number Diff line change
@@ -1,14 +1,16 @@
// <snippet19>
using System;

public class CompareToSample {
public static void Main() {
char chA = 'A';
char chB = 'B';
public class CompareToSample
{
public static void Main()
{
char chA = 'A';
char chB = 'B';

Console.WriteLine(chA.CompareTo('A')); // Output: "0" (meaning they're equal)
Console.WriteLine('b'.CompareTo(chB)); // Output: "32" (meaning 'b' is greater than 'B' by 32)
Console.WriteLine(chA.CompareTo(chB)); // Output: "-1" (meaning 'A' is less than 'B' by 1)
}
Console.WriteLine(chA.CompareTo('A')); // Output: "0" (meaning they're equal)
Console.WriteLine('b'.CompareTo(chB)); // Output: "32" (meaning 'b' is greater than 'B' by 32)
Console.WriteLine(chA.CompareTo(chB)); // Output: "-1" (meaning 'A' is less than 'B' by 1)
}
}
// </snippet19>
114 changes: 56 additions & 58 deletions snippets/csharp/System/Char/ConvertFromUtf32/utf.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,68 +7,66 @@ 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.

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

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

Console.WriteLine(comment1b);
letterA = Char.ConvertToUtf32(s1, 0);
Console.Write(" 1b) ");
Show(s1);
Console.WriteLine(" => 0x{0:X}", letterA);
Console.WriteLine();

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

// 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.

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

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

Console.WriteLine(comment2b);
music = Char.ConvertToUtf32(s1, 0);
Console.Write(" 2b) ");
Show(s1);
Console.WriteLine(" => 0x{0:X}", music);

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

Console.WriteLine(comment2c);
music = Char.ConvertToUtf32(s1[0], s1[1]);
Console.Write(" 2c) ");
Show(s1);
Console.WriteLine(" => 0x{0:X}", music);
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.

Console.WriteLine(comment);
s1 = char.ConvertFromUtf32(letterA);
Console.Write($" 1a) 0x{letterA:X} => ");
Show(s1);
Console.WriteLine();

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

Console.WriteLine(comment1b);
letterA = char.ConvertToUtf32(s1, 0);
Console.Write(" 1b) ");
Show(s1);
Console.WriteLine($" => 0x{letterA:X}");
Console.WriteLine();

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

// 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.

Console.WriteLine(comment);
s1 = char.ConvertFromUtf32(music);
Console.Write($" 2a) 0x{music:X} => ");
Show(s1);
Console.WriteLine();

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

Console.WriteLine(comment2b);
music = char.ConvertToUtf32(s1, 0);
Console.Write(" 2b) ");
Show(s1);
Console.WriteLine($" => 0x{music:X}");

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

Console.WriteLine(comment2c);
music = char.ConvertToUtf32(s1[0], s1[1]);
Console.Write(" 2c) ");
Show(s1);
Console.WriteLine($" => 0x{music:X}");
}

private static void Show(string s)
{
for (int x = 0; x < s.Length; x++)
for (int x = 0; x < s.Length; x++)
{
Console.Write("0x{0:X}{1}",
(int)s[x],
((x == s.Length-1)? String.Empty : ", "));
Console.Write($"0x{(int)s[x]:X}{((x == s.Length - 1) ? string.Empty : ", ")}");
}
}
}
Expand All @@ -88,4 +86,4 @@ Create a code point from a high surrogate and a low surrogate code point.
2c) 0xD834, 0xDD61 => 0x1D161

*/
//</snippet1>
//</snippet1>
16 changes: 9 additions & 7 deletions snippets/csharp/System/Char/Equals/equals.cs
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Original file line number Diff line number Diff line change
@@ -1,13 +1,15 @@
// <snippet20>
using System;

public class EqualsSample {
public static void Main() {
char chA = 'A';
char chB = 'B';
public class EqualsSample
{
public static void Main()
{
char chA = 'A';
char chB = 'B';

Console.WriteLine(chA.Equals('A')); // Output: "True"
Console.WriteLine('b'.Equals(chB)); // Output: "False"
}
Console.WriteLine(chA.Equals('A')); // Output: "True"
Console.WriteLine('b'.Equals(chB)); // Output: "False"
}
}
// </snippet20>
14 changes: 8 additions & 6 deletions snippets/csharp/System/Char/GetNumericValue/getnumericvalue.cs
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Original file line number Diff line number Diff line change
@@ -1,12 +1,14 @@
// <snippet1>
using System;

public class GetNumericValueSample {
public static void Main() {
string str = "input: 1";
public class GetNumericValueSample
{
public static void Main()
{
string str = "input: 1";

Console.WriteLine(Char.GetNumericValue('8')); // Output: "8"
Console.WriteLine(Char.GetNumericValue(str, 7)); // Output: "1"
}
Console.WriteLine(char.GetNumericValue('8')); // Output: "8"
Console.WriteLine(char.GetNumericValue(str, 7)); // Output: "1"
}
}
// </snippet1>
158 changes: 78 additions & 80 deletions snippets/csharp/System/Char/GetNumericValue/getnumericvalue1.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,88 +2,86 @@

public class Example
{
public static void Main()
{
Overload1();
Console.WriteLine();
Overload2();
}
public static void Main()
{
Overload1();
Console.WriteLine();
Overload2();
}

private static void Overload1()
{
// <Snippet2>
int utf32 = 0x10107; // AEGEAN NUMBER ONE
string surrogate = Char.ConvertFromUtf32(utf32);
foreach (var ch in surrogate)
Console.WriteLine("U+{0:X4}: {1} ", Convert.ToUInt16(ch),
Char.GetNumericValue(ch));
private static void Overload1()
{
// <Snippet2>
int utf32 = 0x10107; // AEGEAN NUMBER ONE
string surrogate = char.ConvertFromUtf32(utf32);
foreach (char ch in surrogate)
Console.WriteLine($"U+{Convert.ToUInt16(ch):X4}: {char.GetNumericValue(ch)} ");

// The example displays the following output:
// U+D800: -1
// U+DD07: -1
// </Snippet2>
}
// The example displays the following output:
// U+D800: -1
// U+DD07: -1
// </Snippet2>
}

private static void Overload2()
{
// <Snippet3>
// Define a UTF32 value for each character in the
// Aegean numbering system.
for (int utf32 = 0x10107; utf32 <= 0x10133; utf32++) {
string surrogate = Char.ConvertFromUtf32(utf32);
for (int ctr = 0; ctr < surrogate.Length; ctr++)
Console.Write("U+{0:X4} at position {1}: {2} ",
Convert.ToUInt16(surrogate[ctr]), ctr,
Char.GetNumericValue(surrogate, ctr));
private static void Overload2()
{
// <Snippet3>
// Define a UTF32 value for each character in the
// Aegean numbering system.
for (int utf32 = 0x10107; utf32 <= 0x10133; utf32++)
{
string surrogate = char.ConvertFromUtf32(utf32);
for (int ctr = 0; ctr < surrogate.Length; ctr++)
Console.Write($"U+{Convert.ToUInt16(surrogate[ctr]):X4} at position {ctr}: {char.GetNumericValue(surrogate, ctr)} ");

Console.WriteLine();
}
// The example displays the following output:
// U+D800 at position 0: 1 U+DD07 at position 1: -1
// U+D800 at position 0: 2 U+DD08 at position 1: -1
// U+D800 at position 0: 3 U+DD09 at position 1: -1
// U+D800 at position 0: 4 U+DD0A at position 1: -1
// U+D800 at position 0: 5 U+DD0B at position 1: -1
// U+D800 at position 0: 6 U+DD0C at position 1: -1
// U+D800 at position 0: 7 U+DD0D at position 1: -1
// U+D800 at position 0: 8 U+DD0E at position 1: -1
// U+D800 at position 0: 9 U+DD0F at position 1: -1
// U+D800 at position 0: 10 U+DD10 at position 1: -1
// U+D800 at position 0: 20 U+DD11 at position 1: -1
// U+D800 at position 0: 30 U+DD12 at position 1: -1
// U+D800 at position 0: 40 U+DD13 at position 1: -1
// U+D800 at position 0: 50 U+DD14 at position 1: -1
// U+D800 at position 0: 60 U+DD15 at position 1: -1
// U+D800 at position 0: 70 U+DD16 at position 1: -1
// U+D800 at position 0: 80 U+DD17 at position 1: -1
// U+D800 at position 0: 90 U+DD18 at position 1: -1
// U+D800 at position 0: 100 U+DD19 at position 1: -1
// U+D800 at position 0: 200 U+DD1A at position 1: -1
// U+D800 at position 0: 300 U+DD1B at position 1: -1
// U+D800 at position 0: 400 U+DD1C at position 1: -1
// U+D800 at position 0: 500 U+DD1D at position 1: -1
// U+D800 at position 0: 600 U+DD1E at position 1: -1
// U+D800 at position 0: 700 U+DD1F at position 1: -1
// U+D800 at position 0: 800 U+DD20 at position 1: -1
// U+D800 at position 0: 900 U+DD21 at position 1: -1
// U+D800 at position 0: 1000 U+DD22 at position 1: -1
// U+D800 at position 0: 2000 U+DD23 at position 1: -1
// U+D800 at position 0: 3000 U+DD24 at position 1: -1
// U+D800 at position 0: 4000 U+DD25 at position 1: -1
// U+D800 at position 0: 5000 U+DD26 at position 1: -1
// U+D800 at position 0: 6000 U+DD27 at position 1: -1
// U+D800 at position 0: 7000 U+DD28 at position 1: -1
// U+D800 at position 0: 8000 U+DD29 at position 1: -1
// U+D800 at position 0: 9000 U+DD2A at position 1: -1
// U+D800 at position 0: 10000 U+DD2B at position 1: -1
// U+D800 at position 0: 20000 U+DD2C at position 1: -1
// U+D800 at position 0: 30000 U+DD2D at position 1: -1
// U+D800 at position 0: 40000 U+DD2E at position 1: -1
// U+D800 at position 0: 50000 U+DD2F at position 1: -1
// U+D800 at position 0: 60000 U+DD30 at position 1: -1
// U+D800 at position 0: 70000 U+DD31 at position 1: -1
// U+D800 at position 0: 80000 U+DD32 at position 1: -1
// U+D800 at position 0: 90000 U+DD33 at position 1: -1
// </Snippet3>
}
Console.WriteLine();
}
// The example displays the following output:
// U+D800 at position 0: 1 U+DD07 at position 1: -1
// U+D800 at position 0: 2 U+DD08 at position 1: -1
// U+D800 at position 0: 3 U+DD09 at position 1: -1
// U+D800 at position 0: 4 U+DD0A at position 1: -1
// U+D800 at position 0: 5 U+DD0B at position 1: -1
// U+D800 at position 0: 6 U+DD0C at position 1: -1
// U+D800 at position 0: 7 U+DD0D at position 1: -1
// U+D800 at position 0: 8 U+DD0E at position 1: -1
// U+D800 at position 0: 9 U+DD0F at position 1: -1
// U+D800 at position 0: 10 U+DD10 at position 1: -1
// U+D800 at position 0: 20 U+DD11 at position 1: -1
// U+D800 at position 0: 30 U+DD12 at position 1: -1
// U+D800 at position 0: 40 U+DD13 at position 1: -1
// U+D800 at position 0: 50 U+DD14 at position 1: -1
// U+D800 at position 0: 60 U+DD15 at position 1: -1
// U+D800 at position 0: 70 U+DD16 at position 1: -1
// U+D800 at position 0: 80 U+DD17 at position 1: -1
// U+D800 at position 0: 90 U+DD18 at position 1: -1
// U+D800 at position 0: 100 U+DD19 at position 1: -1
// U+D800 at position 0: 200 U+DD1A at position 1: -1
// U+D800 at position 0: 300 U+DD1B at position 1: -1
// U+D800 at position 0: 400 U+DD1C at position 1: -1
// U+D800 at position 0: 500 U+DD1D at position 1: -1
// U+D800 at position 0: 600 U+DD1E at position 1: -1
// U+D800 at position 0: 700 U+DD1F at position 1: -1
// U+D800 at position 0: 800 U+DD20 at position 1: -1
// U+D800 at position 0: 900 U+DD21 at position 1: -1
// U+D800 at position 0: 1000 U+DD22 at position 1: -1
// U+D800 at position 0: 2000 U+DD23 at position 1: -1
// U+D800 at position 0: 3000 U+DD24 at position 1: -1
// U+D800 at position 0: 4000 U+DD25 at position 1: -1
// U+D800 at position 0: 5000 U+DD26 at position 1: -1
// U+D800 at position 0: 6000 U+DD27 at position 1: -1
// U+D800 at position 0: 7000 U+DD28 at position 1: -1
// U+D800 at position 0: 8000 U+DD29 at position 1: -1
// U+D800 at position 0: 9000 U+DD2A at position 1: -1
// U+D800 at position 0: 10000 U+DD2B at position 1: -1
// U+D800 at position 0: 20000 U+DD2C at position 1: -1
// U+D800 at position 0: 30000 U+DD2D at position 1: -1
// U+D800 at position 0: 40000 U+DD2E at position 1: -1
// U+D800 at position 0: 50000 U+DD2F at position 1: -1
// U+D800 at position 0: 60000 U+DD30 at position 1: -1
// U+D800 at position 0: 70000 U+DD31 at position 1: -1
// U+D800 at position 0: 80000 U+DD32 at position 1: -1
// U+D800 at position 0: 90000 U+DD33 at position 1: -1
// </Snippet3>
}
}
18 changes: 10 additions & 8 deletions snippets/csharp/System/Char/GetUnicodeCategory/getunicodecategory.cs
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Original file line number Diff line number Diff line change
@@ -1,14 +1,16 @@
// <snippet1>
using System;

public class GetUnicodeCategorySample {
public static void Main() {
char ch2 = '2';
string str = "Upper Case";
public class GetUnicodeCategorySample
{
public static void Main()
{
char ch2 = '2';
string str = "Upper Case";

Console.WriteLine(Char.GetUnicodeCategory('a')); // Output: "LowercaseLetter"
Console.WriteLine(Char.GetUnicodeCategory(ch2)); // Output: "DecimalDigitNumber"
Console.WriteLine(Char.GetUnicodeCategory(str, 6)); // Output: "UppercaseLetter"
}
Console.WriteLine(char.GetUnicodeCategory('a')); // Output: "LowercaseLetter"
Console.WriteLine(char.GetUnicodeCategory(ch2)); // Output: "DecimalDigitNumber"
Console.WriteLine(char.GetUnicodeCategory(str, 6)); // Output: "UppercaseLetter"
}
}
// </snippet1>
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