Convert to interpolated strings (csharp dir)

docs/csharp/advanced-topics/expression-trees/snippets/InterpretExpressions.cs

@@ -1,4 +1,4 @@
-using System.Linq.Expressions;
+using System.Linq.Expressions;
 public static class InterpretExpressions
 {
     public static void ParseExpression()
@@ -16,8 +16,7 @@ public static void ParseExpression()
         ParameterExpression left = (ParameterExpression)operation.Left;
         ConstantExpression right = (ConstantExpression)operation.Right;
 
-        Console.WriteLine("Decomposed expression: {0} => {1} {2} {3}",
-                          param.Name, left.Name, operation.NodeType, right.Value);
+        Console.WriteLine($"Decomposed expression: {param.Name} => {left.Name} {operation.NodeType} {right.Value}");
 
         // This code produces the following output:
 

docs/csharp/advanced-topics/reflection-and-attributes/snippets/conceptual/Program.cs

@@ -1,4 +1,4 @@
-// See https://aka.ms/new-console-template for more information
+// See https://aka.ms/new-console-template for more information
 
 
 using System.Reflection;
@@ -35,10 +35,10 @@ from method in type.GetMethods()
 
     foreach (var groupOfMethods in pubTypesQuery)
     {
-        Console.WriteLine("Type: {0}", groupOfMethods.Key);
+        Console.WriteLine($"Type: {groupOfMethods.Key}");
         foreach (var method in groupOfMethods)
         {
-            Console.WriteLine("  {0}", method);
+            Console.WriteLine($"  {method}");
         }
     }
     // </QueryReflection>

docs/csharp/asynchronous-programming/snippets/async-scenarios/Program.cs

@@ -1,4 +1,4 @@
-using System.Text.RegularExpressions;
+using System.Text.RegularExpressions;
 using System.Windows;
 using Microsoft.AspNetCore.Mvc;
 
@@ -111,7 +111,7 @@ private static void Download(string URL)
 
     private static void DoSomethingWithData(object stringData)
     {
-        Console.WriteLine("Displaying data: ", stringData);
+        Console.WriteLine($"Displaying data: {stringData}");
     }
 
     // <GetUsersForDataset>

docs/csharp/fundamentals/coding-style/snippets/coding-conventions/program.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using System.Text;
 
 namespace Coding_Conventions_Examples
 {
@@ -32,7 +32,7 @@ public static void DelegateExamples()
 
         public static void DelMethod(string str)
         {
-            Console.WriteLine("DelMethod argument: {0}", str);
+            Console.WriteLine($"DelMethod argument: {str}");
         }
         //</snippet14b>
 
@@ -174,7 +174,7 @@ static void Main(string[] args)
 
             if ((divisor != 0) && (dividend / divisor) is var result)
             {
-                Console.WriteLine("Quotient: {0}", result);
+                Console.WriteLine($"Quotient: {result}");
             }
             else
             {

docs/csharp/fundamentals/exceptions/snippets/exceptions/ExceptionTest.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Exceptions
 {
@@ -22,7 +22,7 @@ public static void Main()
             try
             {
                 result = SafeDivision(a, b);
-                Console.WriteLine("{0} divided by {1} = {2}", a, b, result);
+                Console.WriteLine($"{a} divided by {b} = {result}");
             }
             catch (DivideByZeroException)
             {

docs/csharp/fundamentals/object-oriented/snippets/objects/Application.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Example
 {
@@ -20,7 +20,7 @@ static void Main()
             // Create  struct instance and initialize by using "new".
             // Memory is allocated on thread stack.
             Person p1 = new Person("Alex", 9);
-            Console.WriteLine("p1 Name = {0} Age = {1}", p1.Name, p1.Age);
+            Console.WriteLine($"p1 Name = {p1.Name} Age = {p1.Age}");
 
             // Create  new struct object. Note that  struct can be initialized
             // without using "new".
@@ -29,10 +29,10 @@ static void Main()
             // Assign values to p2 members.
             p2.Name = "Spencer";
             p2.Age = 7;
-            Console.WriteLine("p2 Name = {0} Age = {1}", p2.Name, p2.Age);
+            Console.WriteLine($"p2 Name = {p2.Name} Age = {p2.Age}");
 
             // p1 values remain unchanged because p2 is  copy.
-            Console.WriteLine("p1 Name = {0} Age = {1}", p1.Name, p1.Age);
+            Console.WriteLine($"p1 Name = {p1.Name} Age = {p1.Age}");
         }
     }
     /*

docs/csharp/fundamentals/object-oriented/snippets/objects/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 public class Person
 {
@@ -17,7 +17,7 @@ class Program
     static void Main()
     {
         Person person1 = new Person("Leopold", 6);
-        Console.WriteLine("person1 Name = {0} Age = {1}", person1.Name, person1.Age);
+        Console.WriteLine($"person1 Name = {person1.Name} Age = {person1.Age}");
 
         // Declare new person, assign person1 to it.
         Person person2 = person1;
@@ -26,8 +26,8 @@ static void Main()
         person2.Name = "Molly";
         person2.Age = 16;
 
-        Console.WriteLine("person2 Name = {0} Age = {1}", person2.Name, person2.Age);
-        Console.WriteLine("person1 Name = {0} Age = {1}", person1.Name, person1.Age);
+        Console.WriteLine($"person2 Name = {person2.Name} Age = {person2.Age}");
+        Console.WriteLine($"person1 Name = {person1.Name} Age = {person1.Age}");
     }
 }
 /*

docs/csharp/language-reference/keywords/snippets/ParameterModifiers.cs

@@ -1,4 +1,4 @@
-namespace Keywords;
+namespace Keywords;
 
 internal class ParameterModifiers
 {
@@ -9,17 +9,17 @@ internal static void ParamPassingExamples()
         // Passing a variable by value means passing a copy of the variable.
         // n1 is a value type
         int n1 = 5;
-        System.Console.WriteLine("The value before calling the method: {0}", n1);
+        System.Console.WriteLine($"The value before calling the method: {n1}");
 
         SquareItValue(n1);  // Passing the variable by value.
-        System.Console.WriteLine("The value after calling the method: {0}", n1);
+        System.Console.WriteLine($"The value after calling the method: {n1}");
 
         static void SquareItValue(int x)
         // The parameter x is passed by value.
         // Changes to x will not affect the original value of x.
         {
             x *= x;
-            System.Console.WriteLine("The value inside the method: {0}", x);
+            System.Console.WriteLine($"The value inside the method: {x}");
         }
         /* Output:
             The value before calling the method: 5
@@ -49,17 +49,17 @@ static void ChangeValue(int[] pArray)
         // Passing a value by reference means passing a reference to the variable.
         // n is a value type
         int n2 = 5;
-        System.Console.WriteLine("The value before calling the method: {0}", n2);
+        System.Console.WriteLine($"The value before calling the method: {n2}");
 
         SquareItReference(ref n2);  // Passing the variable by reference.
-        System.Console.WriteLine("The value after calling the method: {0}", n2);
+        System.Console.WriteLine($"The value after calling the method: {n2}");
 
         static void SquareItReference(ref int x)
         // The parameter x is passed by reference.
         // Changes to x will affect the original value of x.
         {
             x *= x;
-            System.Console.WriteLine("The value inside the method: {0}", x);
+            System.Console.WriteLine($"The value inside the method: {x}");
         }
         /* Output:
             The value before calling the method: 5

docs/csharp/language-reference/snippets/unsafe-code/Conversions.cs

@@ -20,7 +20,7 @@ public static void Conversions()
                 p++;
             }
             System.Console.WriteLine();
-            System.Console.WriteLine("The value of the integer: {0}", number);
+            System.Console.WriteLine($"The value of the integer: {number}");
 
             /* Output:
                 The 4 bytes of the integer: 00 04 00 00

docs/csharp/linq/get-started/snippets/WalkthroughWritingLinqQueries/Program.cs

@@ -1,4 +1,4 @@
-// <CreateSequence>
+// <CreateSequence>
 using WalkthroughWritingLinqQueries;
 
 // Create a data source by using a collection initializer.
@@ -237,7 +237,7 @@ from student in students
         select totalScore;
 
     double averageScore = studentQuery.Average();
-    Console.WriteLine("Class average score = {0}", averageScore);
+    Console.WriteLine($"Class average score = {averageScore}");
 
     // Output:
     // Class average score = 334.166666666667

docs/csharp/linq/standard-query-operators/snippets/standard-query-operators/IndexExamples.cs

@@ -1,4 +1,4 @@
-using System.Xml.Linq;
+using System.Xml.Linq;
 
 namespace StandardQueryOperators;
 
@@ -34,7 +34,7 @@ orderby gr.Key
 
         foreach (var obj in query)
         {
-            Console.WriteLine("Words of length {0}:", obj.Length);
+            Console.WriteLine($"Words of length {obj.Length}:");
             foreach (string word in obj.Words)
                 Console.WriteLine(word);
         }

docs/csharp/programming-guide/classes-and-structs/snippets/how-to-declare-and-use-read-write-properties/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Properties
 {
@@ -74,20 +74,20 @@ static void Main()
             Person person = new Person();
 
             // Print out the name and the age associated with the person:
-            Console.WriteLine("Person details - {0}", person);
+            Console.WriteLine($"Person details - {person}");
 
             // Set some values on the person object:
             //<Snippet3>
             person.Name = "Joe";
             person.Age = 99;
             //</Snippet3>
-            Console.WriteLine("Person details - {0}", person);
+            Console.WriteLine($"Person details - {person}");
 
             // Increment the Age property:
             //<Snippet5>
             person.Age += 1;
             //</Snippet5>
-            Console.WriteLine("Person details - {0}", person);
+            Console.WriteLine($"Person details - {person}");
 
             // Keep the console window open in debug mode.
             Console.WriteLine("Press any key to exit.");

docs/csharp/programming-guide/classes-and-structs/snippets/how-to-implement-and-call-a-custom-extension-method/Program.cs

@@ -1,11 +1,11 @@
-using CustomExtensions;
+using CustomExtensions;
 
 string s = "The quick brown fox jumped over the lazy dog.";
 // Call the method as if it were an
 // instance method on the type. Note that the first
 // parameter is not specified by the calling code.
 int i = s.WordCount();
-System.Console.WriteLine("Word count of s is {0}", i);
+System.Console.WriteLine($"Word count of s is {i}");
 
 
 namespace CustomExtensions

docs/csharp/programming-guide/classes-and-structs/snippets/methods/Program.cs

@@ -1,4 +1,4 @@
-//<Snippet1>
+//<Snippet1>
 abstract class Motorcycle
 {
     // Anyone can call this.
@@ -31,7 +31,7 @@ static void Main()
         moto.AddGas(15);
         moto.Drive(5, 20);
         double speed = moto.GetTopSpeed();
-        Console.WriteLine("My top speed is {0}", speed);
+        Console.WriteLine($"My top speed is {speed}");
     }
 }
 //</Snippet2>

docs/csharp/programming-guide/classes-and-structs/snippets/private-constructors/Program.cs

@@ -1,4 +1,4 @@
-//<Snippet1>
+//<Snippet1>
 class NLog
 {
     // Private Constructor:
@@ -33,7 +33,7 @@ static void Main()
 
         Counter.currentCount = 100;
         Counter.IncrementCount();
-        Console.WriteLine("New count: {0}", Counter.currentCount);
+        Console.WriteLine($"New count: {Counter.currentCount}");
 
         // Keep the console window open in debug mode.
         Console.WriteLine("Press any key to exit.");

docs/csharp/programming-guide/classes-and-structs/snippets/properties/HidingProperty.cs

@@ -1,4 +1,4 @@
-namespace HidingExample;
+namespace HidingExample;
 //<Hiding>
 public class Employee
 {
@@ -38,8 +38,8 @@ public static void Test()
         ((Employee)m1).Name = "Mary";
         //</CastToBase>
 
-        System.Console.WriteLine("Name in the derived class is: {0}", m1.Name);
-        System.Console.WriteLine("Name in the base class is: {0}", ((Employee)m1).Name);
+        System.Console.WriteLine($"Name in the derived class is: {m1.Name}");
+        System.Console.WriteLine($"Name in the base class is: {((Employee)m1).Name}");
     }
 }
 /* Output:

docs/csharp/programming-guide/classes-and-structs/snippets/properties/interfaces.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace interfaces
 {
@@ -93,8 +93,8 @@ public static void Examples()
             e1.Name = System.Console.ReadLine();
 
             System.Console.WriteLine("The employee information:");
-            System.Console.WriteLine("Employee number: {0}", e1.Counter);
-            System.Console.WriteLine("Employee name: {0}", e1.Name);
+            System.Console.WriteLine($"Employee number: {e1.Counter}");
+            System.Console.WriteLine($"Employee name: {e1.Name}");
             // </SnippetUseProperty>
         }
     }

docs/csharp/programming-guide/classes-and-structs/snippets/static-classes-and-static-class-members/Program.cs

@@ -1,4 +1,4 @@
-//<Snippet1>
+//<Snippet1>
 public static class TemperatureConverter
 {
     public static double CelsiusToFahrenheit(string temperatureCelsius)
@@ -41,13 +41,13 @@ static void Main()
             case "1":
                 Console.Write("Please enter the Celsius temperature: ");
                 F = TemperatureConverter.CelsiusToFahrenheit(Console.ReadLine() ?? "0");
-                Console.WriteLine("Temperature in Fahrenheit: {0:F2}", F);
+                Console.WriteLine($"Temperature in Fahrenheit: {F:F2}");
                 break;
 
             case "2":
                 Console.Write("Please enter the Fahrenheit temperature: ");
                 C = TemperatureConverter.FahrenheitToCelsius(Console.ReadLine() ?? "0");
-                Console.WriteLine("Temperature in Celsius: {0:F2}", C);
+                Console.WriteLine($"Temperature in Celsius: {C:F2}");
                 break;
 
             default:

docs/csharp/programming-guide/classes-and-structs/snippets/static-constructors/Program.cs

@@ -1,4 +1,4 @@
-//<Snippet1>
+//<Snippet1>
 class SimpleClass
 {
     // Static variable that must be initialized at run time.
@@ -39,7 +39,7 @@ static Bus()
     public Bus(int routeNum)
     {
         RouteNumber = routeNum;
-        Console.WriteLine("Bus #{0} is created.", RouteNumber);
+        Console.WriteLine($"Bus #{RouteNumber} is created.");
     }
 
     // Instance method.

docs/csharp/programming-guide/statements-expressions-operators/snippets/how-to-define-value-equality-for-a-type/ValueEqualityClass/Program.cs

@@ -1,4 +1,4 @@
-namespace ValueEqualityClass;
+namespace ValueEqualityClass;
 
 class TwoDPoint : IEquatable<TwoDPoint>
 {
@@ -138,14 +138,14 @@ static void Main(string[] args)
         int i = 5;
 
         Console.WriteLine("pointA.Equals(pointB) = {0}", pointA.Equals(pointB));
-        Console.WriteLine("pointA == pointB = {0}", pointA == pointB);
+        Console.WriteLine($"pointA == pointB = {pointA == pointB}");
         Console.WriteLine("null comparison = {0}", pointA.Equals(pointC));
         Console.WriteLine("Compare to some other type = {0}", pointA.Equals(i));
 
         TwoDPoint pointD = null;
         TwoDPoint pointE = null;
 
-        Console.WriteLine("Two null TwoDPoints are equal: {0}", pointD == pointE);
+        Console.WriteLine($"Two null TwoDPoints are equal: {pointD == pointE}");
 
         pointE = new TwoDPoint(3, 4);
         Console.WriteLine("(pointE == pointA) = {0}", pointE == pointA);