use interpolated strings (#45454)

Author: gewarren

docs/fundamentals/runtime-libraries/snippets/System.Collections.Generic/ListT/Overview/csharp/program.cs

@@ -1,4 +1,4 @@
-//<snippet1>
+//<snippet1>
 using System;
 using System.Collections.Generic;
 
@@ -59,8 +59,9 @@ public static void Main()
 
         // Check the list for part #1734. This calls the IEquatable.Equals method
         // of the Part class, which checks the PartId for equality.
-        Console.WriteLine("\nContains(\"1734\"): {0}",
-        parts.Contains(new Part { PartId = 1734, PartName = "" }));
+        Console.WriteLine($"""
+        Contains("1734"): {parts.Contains(new Part { PartId = 1734, PartName = "" })}
+        """);
 
         // Insert a new item at position 2.
         Console.WriteLine("\nInsert(2, \"1834\")");
@@ -72,7 +73,7 @@ public static void Main()
             Console.WriteLine(aPart);
         }
 
-        Console.WriteLine("\nParts[3]: {0}", parts[3]);
+        Console.WriteLine($"\nParts[3]: {parts[3]}");
 
         Console.WriteLine("\nRemove(\"1534\")");
 

docs/fundamentals/runtime-libraries/snippets/System.Collections.Generic/ListT/Overview/csharp/source.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 public class Example2
@@ -9,7 +9,7 @@ public static void Main()
         //<snippet2>
         List<string> dinosaurs = new List<string>();
 
-        Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);
+        Console.WriteLine($"\nCapacity: {dinosaurs.Capacity}");
 
         dinosaurs.Add("Tyrannosaurus");
         dinosaurs.Add("Amargasaurus");
@@ -23,11 +23,10 @@ public static void Main()
             Console.WriteLine(dinosaur);
         }
 
-        Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);
-        Console.WriteLine("Count: {0}", dinosaurs.Count);
+        Console.WriteLine($"\nCapacity: {dinosaurs.Capacity}");
+        Console.WriteLine($"Count: {dinosaurs.Count}");
 
-        Console.WriteLine("\nContains(\"Deinonychus\"): {0}",
-            dinosaurs.Contains("Deinonychus"));
+        Console.WriteLine($"""\nContains("Deinonychus"): {dinosaurs.Contains("Deinonychus")}""");
 
         Console.WriteLine("\nInsert(2, \"Compsognathus\")");
         dinosaurs.Insert(2, "Compsognathus");
@@ -40,7 +39,7 @@ public static void Main()
 
         //<snippet3>
         // Shows accessing the list using the Item property.
-        Console.WriteLine("\ndinosaurs[3]: {0}", dinosaurs[3]);
+        Console.WriteLine($"\ndinosaurs[3]: {dinosaurs[3]}");
         //</snippet3>
 
         Console.WriteLine("\nRemove(\"Compsognathus\")");
@@ -54,13 +53,13 @@ public static void Main()
 
         dinosaurs.TrimExcess();
         Console.WriteLine("\nTrimExcess()");
-        Console.WriteLine("Capacity: {0}", dinosaurs.Capacity);
-        Console.WriteLine("Count: {0}", dinosaurs.Count);
+        Console.WriteLine($"Capacity: {dinosaurs.Capacity}");
+        Console.WriteLine($"Count: {dinosaurs.Count}");
 
         dinosaurs.Clear();
         Console.WriteLine("\nClear()");
-        Console.WriteLine("Capacity: {0}", dinosaurs.Capacity);
-        Console.WriteLine("Count: {0}", dinosaurs.Count);
+        Console.WriteLine($"Capacity: {dinosaurs.Capacity}");
+        Console.WriteLine($"Count: {dinosaurs.Count}");
 
         /* This code example produces the following output:
 

docs/fundamentals/runtime-libraries/snippets/System.Diagnostics/PerformanceCounter/NextValue/csharp/elapsedtime.cs

@@ -1,4 +1,4 @@
-// Notice that the sample is conditionally compiled for Everett vs.
+// Notice that the sample is conditionally compiled for Everett vs.
 // Whidbey builds.  Whidbey introduced new APIs that are not available
 // in Everett.  Snippet IDs do not overlap between Whidbey and Everett;
 // Snippet #1 is Everett, Snippet #2 and #3 are Whidbey.
@@ -169,7 +169,7 @@ public static void CollectSamples()
         }
         else
         {
-            Console.WriteLine("Category exists - {0}", categoryName);
+            Console.WriteLine($"Category exists - {categoryName}");
         }
 
         //<Snippet3>

docs/fundamentals/runtime-libraries/snippets/System.Dynamic/ExpandoObject/Overview/csharp/program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -89,11 +89,10 @@ static void Main(string[] args)
         }
         private static void WritePerson(dynamic person)
         {
-            Console.WriteLine("{0} is {1} years old.",
-                              person.Name, person.Age);
+            Console.WriteLine($"{person.Name} is {person.Age} years old.");
             // The following statement causes an exception
             // if you pass the employee object.
-            // Console.WriteLine("Manages {0} people", person.TeamSize);
+            // Console.WriteLine($"Manages {person.TeamSize} people");
         }
     }
     // This code example produces the following output:
@@ -120,7 +119,7 @@ static void Test()
         private static void HandlePropertyChanges(
             object sender, PropertyChangedEventArgs e)
         {
-            Console.WriteLine("{0} has changed.", e.PropertyName);
+            Console.WriteLine($"{e.PropertyName} has changed.");
         }
     }
     //</Snippet7>

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentCulture/csharp/Async1.cs

@@ -1,4 +1,4 @@
-// <Snippet14>
+// <Snippet14>
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -11,22 +11,16 @@ public class Example14
     public static async Task Main()
     {
         var tasks = new List<Task>();
-        Console.WriteLine("The current culture is {0}",
-                          Thread.CurrentThread.CurrentCulture.Name);
+        Console.WriteLine($"The current culture is {Thread.CurrentThread.CurrentCulture.Name}");
         Thread.CurrentThread.CurrentCulture = new CultureInfo("pt-BR");
         // Change the current culture to Portuguese (Brazil).
-        Console.WriteLine("Current culture changed to {0}",
-                          Thread.CurrentThread.CurrentCulture.Name);
-        Console.WriteLine("Application thread is thread {0}",
-                          Thread.CurrentThread.ManagedThreadId);
+        Console.WriteLine($"Current culture changed to {Thread.CurrentThread.CurrentCulture.Name}");
+        Console.WriteLine($"Application thread is thread {Thread.CurrentThread.ManagedThreadId}");
         // Launch six tasks and display their current culture.
         for (int ctr = 0; ctr <= 5; ctr++)
             tasks.Add(Task.Run(() =>
             {
-                Console.WriteLine("Culture of task {0} on thread {1} is {2}",
-                                  Task.CurrentId,
-                                  Thread.CurrentThread.ManagedThreadId,
-                                  Thread.CurrentThread.CurrentCulture.Name);
+                Console.WriteLine($"Culture of task {Task.CurrentId} on thread {Thread.CurrentThread.ManagedThreadId} is {Thread.CurrentThread.CurrentCulture.Name}");
             }));
 
         await Task.WhenAll(tasks.ToArray());

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentCulture/csharp/Get1.cs

@@ -1,4 +1,4 @@
-// <Snippet5>
+// <Snippet5>
 using System;
 using System.Globalization;
 
@@ -7,8 +7,7 @@ public class Example5
    public static void Main()
    {
       CultureInfo culture = CultureInfo.CurrentCulture;
-      Console.WriteLine("The current culture is {0} [{1}]",
-                        culture.NativeName, culture.Name);
+      Console.WriteLine($"The current culture is {culture.NativeName} [{culture.Name}]");
    }
 }
 // The example displays output like the following:

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentCulture/csharp/changeculture11.cs

@@ -1,4 +1,4 @@
-// <Snippet11>
+// <Snippet11>
 using System;
 using System.Globalization;
 using System.Threading;
@@ -7,10 +7,7 @@ public class Info11 : MarshalByRefObject
 {
     public void ShowCurrentCulture()
     {
-        Console.WriteLine("Culture of {0} in application domain {1}: {2}",
-                          Thread.CurrentThread.Name,
-                          AppDomain.CurrentDomain.FriendlyName,
-                          CultureInfo.CurrentCulture.Name);
+        Console.WriteLine($"Culture of {Thread.CurrentThread.Name} in application domain {AppDomain.CurrentDomain.FriendlyName}: {CultureInfo.CurrentCulture.Name}");
     }
 }
 

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentCulture/csharp/specific12.cs

@@ -1,4 +1,4 @@
-// <Snippet12>
+// <Snippet12>
 using System;
 using System.Globalization;
 using System.Threading;
@@ -9,14 +9,12 @@ public static void Main()
    {
       double value = 1634.92;
       CultureInfo.CurrentCulture = new CultureInfo("fr-CA");
-      Console.WriteLine("Current Culture: {0}",
-                        CultureInfo.CurrentCulture.Name);
-      Console.WriteLine("{0:C2}\n", value);
+      Console.WriteLine($"Current Culture: {CultureInfo.CurrentCulture.Name}");
+      Console.WriteLine($"{value:C2}\n");
 
       Thread.CurrentThread.CurrentCulture = new CultureInfo("fr");
-      Console.WriteLine("Current Culture: {0}",
-                        CultureInfo.CurrentCulture.Name);
-      Console.WriteLine("{0:C2}", value);
+      Console.WriteLine($"Current Culture: {CultureInfo.CurrentCulture.Name}");
+      Console.WriteLine($"{value:C2}");
    }
 }
 // The example displays the following output:

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentUICulture/csharp/Async1.cs

@@ -1,4 +1,4 @@
-// <Snippet14>
+// <Snippet14>
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -11,22 +11,16 @@ public class Example
     public static async Task Main()
     {
         var tasks = new List<Task>();
-        Console.WriteLine("The current UI culture is {0}",
-                          Thread.CurrentThread.CurrentUICulture.Name);
+        Console.WriteLine($"The current UI culture is {Thread.CurrentThread.CurrentUICulture.Name}");
         Thread.CurrentThread.CurrentUICulture = new CultureInfo("pt-BR");
         // Change the current UI culture to Portuguese (Brazil).
-        Console.WriteLine("Current UI culture changed to {0}",
-                          Thread.CurrentThread.CurrentUICulture.Name);
-        Console.WriteLine("Application thread is thread {0}",
-                          Thread.CurrentThread.ManagedThreadId);
+        Console.WriteLine($"Current UI culture changed to {Thread.CurrentThread.CurrentUICulture.Name}");
+        Console.WriteLine($"Application thread is thread {Thread.CurrentThread.ManagedThreadId}");
         // Launch six tasks and display their current culture.
         for (int ctr = 0; ctr <= 5; ctr++)
             tasks.Add(Task.Run(() =>
             {
-                Console.WriteLine("UI Culture of task {0} on thread {1} is {2}",
-                                  Task.CurrentId,
-                                  Thread.CurrentThread.ManagedThreadId,
-                                  Thread.CurrentThread.CurrentUICulture.Name);
+                Console.WriteLine($"UI Culture of task {Task.CurrentId} on thread {Thread.CurrentThread.ManagedThreadId} is {Thread.CurrentThread.CurrentUICulture.Name}");
             }));
 
         await Task.WhenAll(tasks.ToArray());

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentUICulture/csharp/Get1.cs

@@ -1,4 +1,4 @@
-// <Snippet5>
+// <Snippet5>
 using System;
 using System.Globalization;
 
@@ -7,8 +7,7 @@ public class Example2
     public static void Main()
     {
         CultureInfo culture = CultureInfo.CurrentUICulture;
-        Console.WriteLine("The current UI culture is {0} [{1}]",
-                          culture.NativeName, culture.Name);
+        Console.WriteLine($"The current UI culture is {culture.NativeName} [{culture.Name}]");
     }
 }
 // The example displays output like the following:

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/CurrentUICulture/csharp/currentuiculture1.cs

@@ -1,17 +1,15 @@
-// <Snippet1>
+// <Snippet1>
 using System;
 using System.Globalization;
 
 public class Example1
 {
     public static void Main()
     {
-        Console.WriteLine("The current UI culture: {0}",
-                          CultureInfo.CurrentUICulture.Name);
+        Console.WriteLine($"The current UI culture: {CultureInfo.CurrentUICulture.Name}");
 
         CultureInfo.CurrentUICulture = CultureInfo.CreateSpecificCulture("fr-FR");
-        Console.WriteLine("The current UI culture: {0}",
-                          CultureInfo.CurrentUICulture.Name);
+        Console.WriteLine($"The current UI culture: {CultureInfo.CurrentUICulture.Name}");
     }
 }
 // The example displays output like the following:

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/InvariantCulture/csharp/persist1.cs

@@ -1,4 +1,4 @@
-// <Snippet1>
+// <Snippet1>
 using System;
 using System.IO;
 using System.Globalization;
@@ -24,22 +24,20 @@ public static void Main()
       String input;
       while ((input = sr.ReadLine()) != null)
       {
-         Console.WriteLine("Stored data: {0}\n" , input);
+         Console.WriteLine($"Stored data: {input}\n");
 
          // Parse the stored string.
          DateTime dtOut = DateTime.Parse(input, invC, DateTimeStyles.RoundtripKind);
 
          // Create a French (France) CultureInfo object.
          CultureInfo frFr = new CultureInfo("fr-FR");
          // Displays the date formatted for the "fr-FR" culture.
-         Console.WriteLine("Date formatted for the {0} culture: {1}" ,
-                           frFr.Name, dtOut.ToString("f", frFr));
+         Console.WriteLine($"Date formatted for the {frFr.Name} culture: {dtOut.ToString("f", frFr)}");
 
          // Creates a German (Germany) CultureInfo object.
          CultureInfo deDe= new CultureInfo("de-De");
          // Displays the date formatted for the "de-DE" culture.
-         Console.WriteLine("Date formatted for {0} culture: {1}" ,
-                           deDe.Name, dtOut.ToString("f", deDe));
+         Console.WriteLine($"Date formatted for {deDe.Name} culture: {dtOut.ToString("f", deDe)}");
       }
       sr.Close();
    }

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/csharp/appdomainex1.cs

@@ -1,4 +1,4 @@
-// <Snippet1>
+// <Snippet1>
 using System;
 using System.Globalization;
 
@@ -55,14 +55,14 @@ public class Info : MarshalByRefObject
 {
     public void DisplayDate()
     {
-        Console.WriteLine("Today is {0:D}", DateTime.Now);
+        Console.WriteLine($"Today is {DateTime.Now:D}");
     }
 
     public void DisplayCultures()
     {
-        Console.WriteLine("Application domain is {0}", AppDomain.CurrentDomain.Id);
-        Console.WriteLine("Default Culture: {0}", CultureInfo.DefaultThreadCurrentCulture);
-        Console.WriteLine("Default UI Culture: {0}", CultureInfo.DefaultThreadCurrentUICulture);
+        Console.WriteLine($"Application domain is {AppDomain.CurrentDomain.Id}");
+        Console.WriteLine($"Default Culture: {CultureInfo.DefaultThreadCurrentCulture}");
+        Console.WriteLine($"Default UI Culture: {CultureInfo.DefaultThreadCurrentUICulture}");
     }
 }
 // The example displays the following output:

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/csharp/asyncculture3.cs

@@ -1,4 +1,4 @@
-// <Snippet3>
+// <Snippet3>
 using System;
 using System.Globalization;
 using System.Threading;
@@ -22,18 +22,15 @@ public static void Main()
             return output;
         };
 
-        Console.WriteLine("The example is running on thread {0}",
-                          Thread.CurrentThread.ManagedThreadId);
+        Console.WriteLine($"The example is running on thread {Thread.CurrentThread.ManagedThreadId}");
         // Make the current culture different from the system culture.
-        Console.WriteLine("The current culture is {0}",
-                          CultureInfo.CurrentCulture.Name);
+        Console.WriteLine($"The current culture is {CultureInfo.CurrentCulture.Name}");
         if (CultureInfo.CurrentCulture.Name == "fr-FR")
             Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
         else
             Thread.CurrentThread.CurrentCulture = new CultureInfo("fr-FR");
 
-        Console.WriteLine("Changed the current culture to {0}.\n",
-                          CultureInfo.CurrentCulture.Name);
+        Console.WriteLine($"Changed the current culture to {CultureInfo.CurrentCulture.Name}.\n");
         CultureInfo.DefaultThreadCurrentCulture = CultureInfo.CurrentCulture;
 
         // Execute the delegate synchronously.

docs/fundamentals/runtime-libraries/snippets/System.Globalization/CultureInfo/csharp/change1.cs

@@ -1,4 +1,4 @@
-// <Snippet3>
+// <Snippet3>
 using System;
 using System.Globalization;
 
@@ -7,16 +7,15 @@ public class ChangeEx1
     public static void Main()
     {
         CultureInfo current = CultureInfo.CurrentCulture;
-        Console.WriteLine("The current culture is {0}", current.Name);
+        Console.WriteLine($"The current culture is {current.Name}");
         CultureInfo newCulture;
         if (current.Name.Equals("fr-FR"))
             newCulture = new CultureInfo("fr-LU");
         else
             newCulture = new CultureInfo("fr-FR");
 
         CultureInfo.CurrentCulture = newCulture;
-        Console.WriteLine("The current culture is now {0}",
-                          CultureInfo.CurrentCulture.Name);
+        Console.WriteLine($"The current culture is now {CultureInfo.CurrentCulture.Name}");
     }
 }
 // The example displays output like the following: