Use interpolated strings (CLR dir) (#45495)

Author: gewarren

samples/snippets/csharp/VS_Snippets_CLR/AsyncDesignPattern/CS/AsyncDelegateNoStateObject.cs

@@ -78,7 +78,7 @@ public static void Main()
                     Console.WriteLine($"Addresses for {hostNames[i]}");
                     for (int k = 0; k < addresses.Length; k++)
                     {
-                        Console.WriteLine("{0}",addresses[k].ToString());
+                        Console.WriteLine($"{addresses[k].ToString()}");
                     }
                 }
             }

samples/snippets/csharp/VS_Snippets_CLR/AsyncDesignPattern/CS/AsyncDelegateWithStateObject.cs

@@ -125,7 +125,7 @@ public static void Main()
                             Console.WriteLine($"Addresses for {r.HostName}");
                             for (int k = 0; k < addresses.Length; k++)
                             {
-                                Console.WriteLine("{0}",addresses[k].ToString());
+                                Console.WriteLine($"{addresses[k].ToString()}");
                             }
                         }
                     }

samples/snippets/csharp/VS_Snippets_CLR/AsyncDesignPattern/CS/Async_EndBlock.cs

@@ -47,7 +47,7 @@ public static void Main(string[] args)
                     Console.WriteLine("Addresses");
                     for (int i = 0; i < addresses.Length; i++)
                     {
-                        Console.WriteLine("{0}",addresses[i].ToString());
+                        Console.WriteLine($"{addresses[i].ToString()}");
                     }
                 }
             }

samples/snippets/csharp/VS_Snippets_CLR/AsyncDesignPattern/CS/Async_EndBlockWait.cs

@@ -48,7 +48,7 @@ public static void Main(string[] args)
                     Console.WriteLine("Addresses");
                     for (int i = 0; i < addresses.Length; i++)
                     {
-                        Console.WriteLine("{0}",addresses[i].ToString());
+                        Console.WriteLine($"{addresses[i].ToString()}");
                     }
                 }
             }

samples/snippets/csharp/VS_Snippets_CLR/AsyncDesignPattern/CS/Async_Poll.cs

@@ -60,7 +60,7 @@ public static void Main(string[] args)
                     Console.WriteLine("Addresses");
                     for (int i = 0; i < addresses.Length; i++)
                     {
-                        Console.WriteLine("{0}",addresses[i].ToString());
+                        Console.WriteLine($"{addresses[i].ToString()}");
                     }
                 }
             }

samples/snippets/csharp/VS_Snippets_CLR/CodeDomExample/CS/source3.cs

@@ -85,7 +85,7 @@ public static bool CompileCSharpCode(string sourceFile, string exeFile)
             Console.WriteLine($"Errors building {sourceFile} into {cr.PathToAssembly}");
             foreach (CompilerError ce in cr.Errors)
             {
-                Console.WriteLine("  {0}", ce.ToString());
+                Console.WriteLine($"  {ce.ToString()}");
                 Console.WriteLine();
             }
         }

samples/snippets/csharp/VS_Snippets_CLR/DynamicMethodHowTo/cs/source.cs

@@ -1,4 +1,4 @@
-//<Snippet1>
+//<Snippet1>
 using System;
 using System.Reflection;
 using System.Reflection.Emit;
@@ -90,8 +90,7 @@ public static void Main()
             (OneParameter<long, int>)
             squareIt.CreateDelegate(typeof(OneParameter<long, int>));
 
-        Console.WriteLine("123456789 squared = {0}",
-            invokeSquareIt(123456789));
+        Console.WriteLine($"123456789 squared = {invokeSquareIt(123456789)}");
         //</Snippet6>
 
         // Example 2: A dynamic method bound to an instance.
@@ -167,7 +166,7 @@ public static void Main()
                 new Example(42)
             );
 
-        Console.WriteLine("3 * test = {0}", invoke(3));
+        Console.WriteLine($"3 * test = {invoke(3)}");
         //</Snippet16>
     }
 }

samples/snippets/csharp/VS_Snippets_CLR/EmitGenericType/CS/source.cs

@@ -240,7 +240,10 @@ private static void DisplayGenericParameters(Type t)
 
         foreach( Type tParam in typeParameters )
         {
-            Console.WriteLine("\r\nType parameter {0}:", tParam.ToString());
+            Console.WriteLine($"""
+            
+            Type parameter {tParam.ToString()}:
+            """);
 
             foreach( Type c in tParam.GetGenericParameterConstraints() )
             {

samples/snippets/csharp/VS_Snippets_CLR/Formatting.DateAndTime.Custom/cs/Custom1.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Globalization;
 
 public class Class1
@@ -222,9 +222,8 @@ private static void ShowKSpecifier()
         // Displays -07:00
         Console.WriteLine(DateTime.UtcNow.ToString("%K"));
         // Displays Z
-        Console.WriteLine("'{0}'",
-                          DateTime.SpecifyKind(DateTime.Now,
-                               DateTimeKind.Unspecified).ToString("%K"));
+        Console.WriteLine($"'{DateTime.SpecifyKind(DateTime.Now,
+                               DateTimeKind.Unspecified).ToString("%K")}'");
         // Displays ''
         Console.WriteLine(DateTimeOffset.Now.ToString("%K"));
         // Displays -07:00

samples/snippets/csharp/VS_Snippets_CLR/Formatting.DateAndTime.Custom/cs/escape1.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 public class Example4
 {
@@ -9,8 +9,8 @@ public static void Main()
         string fmt1 = "h \\h m \\m";
         string fmt2 = @"h \h m \m";
 
-        Console.WriteLine("{0} ({1}) -> {2}", date, fmt1, date.ToString(fmt1));
-        Console.WriteLine("{0} ({1}) -> {2}", date, fmt2, date.ToString(fmt2));
+        Console.WriteLine($"{date} ({fmt1}) -> {date.ToString(fmt1)}");
+        Console.WriteLine($"{date} ({fmt2}) -> {date.ToString(fmt2)}");
 
         // The example displays the following output:
         //       6/15/2009 1:45:30 PM (h \h m \m) -> 1 h 45 m