vowel counter long-form code

Author: faqeerhussein

vowel_counter.cs

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+
+using System;
+using System.Linq;
+
+class VowelCounterClass
+{
+    // Step 1: Declare a delegate
+    delegate string VowelsCounterDelegate(string text);
+
+    // Step 2: Declare a class field to store user's text
+    // so that all methods can access its value
+    static string text = "";
+
+    // Program's Entry-Point method
+    static void Main()
+    {
+        // Step-3: instruct user to input any text
+        Console.Write("Enter Any Text: ");
+
+        // Step-4: store the user's supplied text in field
+        text = Console.ReadLine();
+
+        // convert user text to lowercase abc
+        // so that we just have to compare with lowercase vowels 
+        string loweredTxt = text.ToLower();
+
+        // Step-5: Instanstiate the Delegate
+        // using the named method 'TextProcessorMethod'
+        VowelsCounterDelegate vowelsDelegateMethod = TextProcessorMethod;
+
+        // Step-6: execute the delegate like a normal method
+        // by sending user's lowered text as its parameter 
+        string delegateResult = vowelsDelegateMethod(loweredTxt);
+
+        // Final Last Step: display the result 
+        Console.WriteLine(delegateResult);
+    }
+
+    // named method used to assign value to delegate instance
+    static string TextProcessorMethod(string str)
+    {
+        // Read Code Explanation or Docs for Aggregate's documentation
+        return str.Aggregate("", VowelExtractorMethod, VowelsInfoMethod);
+    }
+
+    // used as first parameter of Aggregate method
+    // this method will be called by Aggregate method for every character in text
+    static string VowelExtractorMethod(string str, char ch)
+    {
+        // this will just accumulate (keep adding/concatenating)
+        // the vowels's in user's text inside the accumulator
+        str += "aeiou".Contains(ch) ? ch : "";
+        return str;
+    }
+
+    // used as second parameter of Aggregate method
+    // this method will be called by Aggregate method
+    // only once after all iterations of first parameter method
+    // the supplied string parameter will represent the 
+    // single value of Aggregate method,
+    // containing info about vowels in user text
+    // number of vowels alongwith the actual vowels present in text 
+    static string VowelsInfoMethod(string str)
+    {
+        return $"'{text}' contains {str.Length} Vowels ({str}).";
+    }
+}
+

vowel_counter.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
+    </PropertyGroup>
+    <ItemGroup>
+        <Compile Include="vowel_counter.cs" />
+    </ItemGroup>
+  </Project>