Fix remark about empty array

snippets/csharp/System/String/IndexOfAny/IndexOfAny1.cs

@@ -1,19 +1,20 @@
-// <Snippet1>
-using System;
+using System;
 
-public class Example
+public class Example1
 {
-   public static void Main()
+   public static void Run()
    {
-      char[] chars = { 'a', 'e', 'i', 'o', 'u', 'y', 
+      // <Snippet1>
+      char[] chars = { 'a', 'e', 'i', 'o', 'u', 'y',
                        'A', 'E', 'I', 'O', 'U', 'Y' };
       String s = "The long and winding road...";
-      Console.WriteLine("The first vowel in \n   {0}\nis found at position {1}", 
-                        s, s.IndexOfAny(chars) + 1);                         
+      Console.WriteLine($"The first vowel in \n   {s}\n" +
+          $"is found at index {s.IndexOfAny(chars)}");
+
+      // The example displays the following output:
+      //       The first vowel in
+      //          The long and winding road...
+      //       is found at index 2
+      // </Snippet1>
    }
 }
-// The example displays the following output:
-//       The first vowel in
-//          The long and winding road...
-//       is found at position 3
-// </Snippet1>

snippets/csharp/System/String/IndexOfAny/Program.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Project
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Example1.Run();
+            Example2.Run();
+            Example3.Run();
+        }
+    }
+}

snippets/csharp/System/String/IndexOfAny/Project.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

snippets/csharp/System/String/IndexOfAny/ixany2.cs

@@ -1,41 +1,48 @@
-//<snippet1>
+
 // Sample for String.IndexOfAny(Char[], Int32)
 using System;
 
-class Sample {
-    public static void Main()
+class Example2
+{
+    public static void Run()
     {
-    string br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-";
-    string br2 = "0123456789012345678901234567890123456789012345678901234567890123456";
-    string str = "Now is the time for all good men to come to the aid of their party.";
-    int start;
-    int at;
-    string target = "is";
-    char[] anyOf = target.ToCharArray();
+        //<snippet1>
+        string br1 = "0----+----1----+----2----+----3" +
+            "----+----4----+----5----+----6----+-";
+        string br2 = "012345678901234567890123456789" +
+            "0123456789012345678901234567890123456";
+        string str = "Now is the time for all good men " +
+            "to come to the aid of their party.";
+        int start;
+        int at;
+        string target = "is";
+        char[] anyOf = target.ToCharArray();
 
-    start = str.Length/2;
-    Console.WriteLine();
-    Console.WriteLine("The first character occurrence from position {0} to {1}.",
-                           start, str.Length-1);
-    Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str);
-    Console.Write("A character in '{0}' occurs at position: ", target);
+        start = str.Length / 2;
+        Console.WriteLine();
+        Console.WriteLine("The first character occurrence " +
+            $"from position {start} to {str.Length - 1}:");
+        Console.WriteLine($"{Environment.NewLine}{br1}{Environment.NewLine}" +
+            $"{br2}{Environment.NewLine}{str}{Environment.NewLine}");
+        Console.Write($"A character in '{target}' occurs at position: ");
 
-    at = str.IndexOfAny(anyOf, start);
-    if (at > -1)
-        Console.Write(at);
-    else
-        Console.Write("(not found)");
-    Console.WriteLine();
-    }
-}
-/*
+        at = str.IndexOfAny(anyOf, start);
+        if (at > -1)
+            Console.Write(at);
+        else
+            Console.Write("(not found)");
+        Console.WriteLine();
+
+        /*
 
-The first character occurrence from position 33 to 66.
-0----+----1----+----2----+----3----+----4----+----5----+----6----+-
-0123456789012345678901234567890123456789012345678901234567890123456
-Now is the time for all good men to come to the aid of their party.
+        The first character occurrence from position 33 to 66.
+        0----+----1----+----2----+----3----+----4----+----5----+----6----+-
+        0123456789012345678901234567890123456789012345678901234567890123456
+        Now is the time for all good men to come to the aid of their party.
 
-A character in 'is' occurs at position: 49
+        A character in 'is' occurs at position: 49
 
-*/
-//</snippet1>
+        */
+        //</snippet1>
+    }
+}

snippets/csharp/System/String/IndexOfAny/ixany3.cs

@@ -1,42 +1,47 @@
-//<snippet1>
+
 // Sample for String.IndexOfAny(Char[], Int32, Int32)
 using System;
 
-class Sample {
-    public static void Main()
+class Example3
+{
+    public static void Run()
     {
-    string br1 = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-";
-    string br2 = "0123456789012345678901234567890123456789012345678901234567890123456";
-    string str = "Now is the time for all good men to come to the aid of their party.";
-    int start;
-    int at;
-    int count;
-    string target = "aid";
-    char[] anyOf = target.ToCharArray();
+        //<snippet1>
+        string br1 = "0----+----1----+----2----+----3----" +
+            "+----4----+----5----+----6----+-";
+        string br2 = "012345678901234567890123456789" +
+            "0123456789012345678901234567890123456";
+        string str = "Now is the time for all good men " +
+            "to come to the aid of their party.";
+        string target = "aid";
+        char[] anyOf = target.ToCharArray();
 
-    start = (str.Length-1)/3;
-    count = (str.Length-1)/4;
-    Console.WriteLine();
-    Console.WriteLine("The first character occurrence from position {0} for {1} characters.", start, count);
-    Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str);
-    Console.Write("A character in '{0}' occurs at position: ", target);
+        int start = (str.Length - 1) / 3;
+        int count = (str.Length - 1) / 4;
+        Console.WriteLine();
+        Console.WriteLine("The first character occurrence from " +
+            $"position {start} for {count} characters:");
+        Console.WriteLine($"{Environment.NewLine}{br1}{Environment.NewLine}{br2}" +
+            $"{Environment.NewLine}{str}{Environment.NewLine}");
+        Console.Write($"A character in '{target}' occurs at position: ");
 
-    at = str.IndexOfAny(anyOf, start, count);
-    if (at > -1)
-        Console.Write(at);
-    else
-        Console.Write("(not found)");
-    Console.WriteLine();
-    }
-}
-/*
+        int at = str.IndexOfAny(anyOf, start, count);
+        if (at > -1)
+            Console.Write(at);
+        else
+            Console.Write("(not found)");
+        Console.WriteLine();
+
+        /*
 
-The first character occurrence from position 22 for 16 characters.
-0----+----1----+----2----+----3----+----4----+----5----+----6----+-
-0123456789012345678901234567890123456789012345678901234567890123456
-Now is the time for all good men to come to the aid of their party.
+        The first character occurrence from position 22 for 16 characters.
+        0----+----1----+----2----+----3----+----4----+----5----+----6----+-
+        0123456789012345678901234567890123456789012345678901234567890123456
+        Now is the time for all good men to come to the aid of their party.
 
-A character in 'aid' occurs at position: 27
+        A character in 'aid' occurs at position: 27
 
-*/
-//</snippet1>
+        */
+        //</snippet1>
+    }
+}

snippets/fsharp/System/String/IndexOfAny/IndexOfAny1.fs

@@ -3,9 +3,10 @@ module IndexOfAny1.fs
 let chars = [| 'a'; 'e'; 'i'; 'o'; 'u'; 'y'
                'A'; 'E'; 'I'; 'O'; 'U'; 'Y' |]
 let s = "The long and winding road..."
-printfn $"The first vowel in \n   {s}\nis found at position {s.IndexOfAny chars + 1}"
+printfn $"The first vowel in \n   {s}\nis found at index {s.IndexOfAny chars}"
+
 // The example displays the following output:
 //       The first vowel in
 //          The long and winding road...
-//       is found at position 3
+//       is found at index 2
 // </Snippet1>

snippets/visualbasic/System/String/IndexOfAny/IndexOfAny1.vb

@@ -2,17 +2,18 @@
 Option Strict On
 
 ' <Snippet1>
-Module Example
-   Public Sub Main()
-      Dim chars() As Char = { "a"c, "e"c, "i"c, "o"c, "u"c, "y"c, 
+Module Example1
+   Public Sub Run()
+      Dim chars() As Char = { "a"c, "e"c, "i"c, "o"c, "u"c, "y"c,
                               "A"c, "E"c, "I"c, "O"c, "U"c, "Y"c }
       Dim s As String = "The long and winding road..."
-      Console.WriteLine("The first vowel in {2}   {0}{2}is found at position {1}", 
-                        s, s.IndexOfAny(chars) + 1, vbCrLf)                         
+      Console.WriteLine("The first vowel in {2}   {0}{2}is found at index {1}",
+                        s, s.IndexOfAny(chars), vbCrLf)
    End Sub
 End Module
+
 ' The example displays the following output:
 '       The first vowel in
 '          The long and winding road...
-'       is found at position 3
+'       is found at index 2
 ' </Snippet1>

snippets/visualbasic/System/String/IndexOfAny/Project.vbproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Library</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

snippets/visualbasic/System/String/IndexOfAny/ixany2.vb

@@ -1,15 +1,15 @@
 '<snippet1>
 ' Sample for String.IndexOfAny(Char[], Int32)
-Class Sample
-   Public Shared Sub Main()
+Class Example2
+   Public Shared Sub Run()
       Dim br1 As String = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"
       Dim br2 As String = "0123456789012345678901234567890123456789012345678901234567890123456"
       Dim str As String = "Now is the time for all good men to come to the aid of their party."
       Dim start As Integer
       Dim at As Integer
       Dim target As String = "is"
       Dim anyOf As Char() = target.ToCharArray()
-      
+
       start = str.Length / 2
       Console.WriteLine()
       Console.WriteLine("Search for a character occurrence from position {0} to {1}.", _
@@ -34,4 +34,4 @@ End Class
 '
 'A character in 'is' occurs at position: 49
 '
-'</snippet1>
+'</snippet1>

snippets/visualbasic/System/String/IndexOfAny/ixany3.vb

@@ -1,7 +1,7 @@
 '<snippet1>
 ' Sample for String.IndexOfAny(Char[], Int32, Int32)
-Class Sample
-   Public Shared Sub Main()
+Class Example3
+   Public Shared Sub Run()
       Dim br1 As String = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"
       Dim br2 As String = "0123456789012345678901234567890123456789012345678901234567890123456"
       Dim str As String = "Now is the time for all good men to come to the aid of their party."
@@ -10,14 +10,14 @@ Class Sample
       Dim count As Integer
       Dim target As String = "aid"
       Dim anyOf As Char() = target.ToCharArray()
-      
+
       start =(str.Length - 1) / 3
       count =(str.Length - 1) / 4
       Console.WriteLine()
       Console.WriteLine("The first character occurrence from position {0} for {1} characters.", start, count)
       Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str)
       Console.Write("A character in '{0}' occurs at position: ", target)
-      
+
       at = str.IndexOfAny(anyOf, start, count)
       If at > - 1 Then
          Console.Write(at)
@@ -35,4 +35,4 @@ End Class
 '
 'A character in 'aid' occurs at position: 27
 '
-'</snippet1>
+'</snippet1>

xml/System/String.xml

@@ -7846,13 +7846,15 @@ In the following example, the <see cref="M:System.String.IndexOf(System.String,S
           <format type="text/markdown"><![CDATA[
 
 ## Remarks
+
 Index numbering starts from zero.
 
-The search for `anyOf` is case-sensitive. If `anyOf` is an empty array, the method finds a match at the beginning of the string (that  is, at index zero).
+The search for `anyOf` is case-sensitive. If `anyOf` is an empty array, the method returns -1.
 
 This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. To perform a culture-sensitive search, use the <xref:System.Globalization.CompareInfo.IndexOf%2A?displayProperty=nameWithType> method, where a Unicode scalar value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture.
 
 ## Examples
+
 The following example finds the first vowel in a string.
 
 :::code language="csharp" source="~/snippets/csharp/System/String/IndexOfAny/IndexOfAny1.cs" interactive="try-dotnet" id="Snippet1":::