Convert to interpolated strings (standard, code-analysis, ml)

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1003.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace ca1003
 {
@@ -35,7 +35,7 @@ public ClassThatHandlesEvent(ClassThatRaisesEvent eventRaiser)
 
         private void HandleEvent(object sender, CustomEventArgs e)
         {
-            Console.WriteLine("Event handled: {0}", e.info);
+            Console.WriteLine($"Event handled: {e.info}");
         }
     }
 
@@ -84,7 +84,7 @@ public ClassThatHandlesEvent(ClassThatRaisesEvent eventRaiser)
 
         private void HandleEvent(object? sender, CustomEventArgs e)
         {
-            Console.WriteLine("Event handled: {0}", e.info);
+            Console.WriteLine($"Event handled: {e.info}");
         }
     }
 

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1021.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace ca1021
 {
@@ -142,8 +142,7 @@ static void UseTheComplicatedClass()
                 // The call to the library.
                 disposition[i] = BadRefAndOut.ReplyInformation(
                    t, out reply[i], ref action[i]);
-                Console.WriteLine("Reply: {0} Action: {1}  return? {2} ",
-                   reply[i], action[i], disposition[i]);
+                Console.WriteLine($"Reply: {reply[i]} Action: {action[i]}  return? {disposition[i]} ");
                 i++;
             }
         }

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1031.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace ca1031
@@ -18,7 +18,7 @@ public GenericExceptionsCaught(string inFile, string outFile)
             }
             catch (SystemException)
             {
-                Console.WriteLine("Unable to open {0}.", inFile);
+                Console.WriteLine($"Unable to open {inFile}.");
             }
 
             try
@@ -27,7 +27,7 @@ public GenericExceptionsCaught(string inFile, string outFile)
             }
             catch
             {
-                Console.WriteLine("Unable to open {0}.", outFile);
+                Console.WriteLine($"Unable to open {outFile}.");
             }
         }
     }
@@ -47,7 +47,7 @@ public GenericExceptionsCaughtFixed(string inFile, string outFile)
             // Fix the first violation by catching a specific exception.
             catch (FileNotFoundException)
             {
-                Console.WriteLine("Unable to open {0}.", inFile);
+                Console.WriteLine($"Unable to open {inFile}.");
             };
 
             // For functionally equivalent code, also catch 
@@ -62,7 +62,7 @@ public GenericExceptionsCaughtFixed(string inFile, string outFile)
             // exception at the end of the catch block.
             catch
             {
-                Console.WriteLine("Unable to open {0}.", outFile);
+                Console.WriteLine($"Unable to open {outFile}.");
                 throw;
             }
         }

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1036.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Globalization;
 
 //<snippet1>
@@ -128,7 +128,7 @@ public static void Main1036(params string[] args)
         else
             answer = "equal to";
 
-        Console.WriteLine("{0} is {1} {2}", r1.Rating, answer, r2.Rating);
+        Console.WriteLine($"{r1.Rating} is {answer} {r2.Rating}");
     }
 }
 //</snippet2>

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1045.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace ca1045
 {
@@ -144,8 +144,7 @@ static void UseTheComplicatedClass()
                 // The call to the library.
                 disposition[i] = BadRefAndOut.ReplyInformation(
                    t, out reply[i], ref action[i]);
-                Console.WriteLine("Reply: {0} Action: {1}  return? {2} ",
-                   reply[i], action[i], disposition[i]);
+                Console.WriteLine($"Reply: {reply[i]} Action: {action[i]}  return? {disposition[i]} ");
                 i++;
             }
         }

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca1046.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace ca1046
 {
@@ -14,7 +14,7 @@ public MyReferenceType(int a, int b)
 
         public override string ToString()
         {
-            return String.Format("({0},{1})", a, b);
+            return String.Format($"({a},{b})");
         }
     }
     //</snippet1>
@@ -28,10 +28,10 @@ public static void Main1046()
             MyReferenceType b = new MyReferenceType(2, 2);
             MyReferenceType c = a;
 
-            Console.WriteLine("a = new {0} and b = new {1} are equal? {2}", a, b, a.Equals(b) ? "Yes" : "No");
-            Console.WriteLine("c and a are equal? {0}", c.Equals(a) ? "Yes" : "No");
-            Console.WriteLine("b and a are == ? {0}", b == a ? "Yes" : "No");
-            Console.WriteLine("c and a are == ? {0}", c == a ? "Yes" : "No");
+            Console.WriteLine($"a = new {a} and b = new {b} are equal? {(a.Equals(b) ? "Yes" : "No")}");
+            Console.WriteLine($"c and a are equal? {(c.Equals(a) ? "Yes" : "No")}");
+            Console.WriteLine($"b and a are == ? {(b == a ? "Yes" : "No")}");
+            Console.WriteLine($"c and a are == ? {(c == a ? "Yes" : "No")}");
         }
     }
     //</snippet2>

docs/fundamentals/code-analysis/quality-rules/snippets/csharp/all-rules/ca2214.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace ca2214
 {
@@ -29,7 +29,7 @@ public DerivedType()
         }
         public override void DoSomething()
         {
-            Console.WriteLine("Derived DoSomething is called - initialized ? {0}", initialized);
+            Console.WriteLine($"Derived DoSomething is called - initialized ? {initialized}");
         }
     }
 

docs/machine-learning/tutorials/snippets/github-issue-classification/csharp/Program.cs

@@ -1,4 +1,4 @@
-// <SnippetAddUsings>
+// <SnippetAddUsings>
 using Microsoft.ML;
 using GitHubIssueClassification;
 // </SnippetAddUsings>
@@ -186,5 +186,5 @@ void SaveModelAsFile(MLContext mlContext,DataViewSchema trainingDataViewSchema,
     mlContext.Model.Save(model, trainingDataViewSchema, _modelPath);
     // </SnippetSaveModel>
 
-    Console.WriteLine("The model is saved to {0}", _modelPath);
+    Console.WriteLine($"The model is saved to {_modelPath}");
 }

docs/machine-learning/tutorials/snippets/phone-calls-anomaly-detection/csharp/Program.cs

@@ -1,4 +1,4 @@
-// <SnippetAddUsings>
+// <SnippetAddUsings>
 using Microsoft.ML;
 using Microsoft.ML.TimeSeries;
 using PhoneCallsAnomalyDetection;
@@ -38,7 +38,7 @@ int DetectPeriod(MLContext mlContext, IDataView phoneCalls)
     // </SnippetDetectSeasonality>
 
     // <SnippetDisplayPeriod>
-    Console.WriteLine("Period of the series is: {0}.", period);
+    Console.WriteLine($"Period of the series is: {period}.");
     // </SnippetDisplayPeriod>
 
     return period;

docs/orleans/host/snippets/ExampleExternalProgram.cs

@@ -1,4 +1,4 @@
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 
 using Orleans.Configuration;
@@ -84,7 +84,7 @@ class GameObserver : IGameObserver
 {
     public void UpdateGameScore(string score)
     {
-        Console.WriteLine("New game score: {0}", score);
+        Console.WriteLine($"New game score: {score}");
     }
 }
 // </gameobserver>

docs/standard/base-types/snippets/composite-formatting/net/csharp/Program.cs

@@ -1,4 +1,4 @@
-
+
 void Index()
 {
     // <index>
@@ -73,7 +73,7 @@ void Examples_Currency()
 {
     // <example_currency>
     int myNumber = 100;
-    Console.WriteLine("{0:C}", myNumber);
+    Console.WriteLine($"{myNumber:C}");
 
     // The example displays the following output
     // if en-US is the current culture:

docs/standard/base-types/snippets/how-to-display-milliseconds-in-date-and-time-values/csharp/Program.cs

@@ -1,4 +1,4 @@
-// <Main>
+// <Main>
 using System.Globalization;
 using System.Text.RegularExpressions;
 
@@ -37,7 +37,7 @@
 }
 catch (FormatException)
 {
-    Console.WriteLine("Unable to convert {0} to a date.", dateString);
+    Console.WriteLine($"Unable to convert {dateString} to a date.");
 }
 // The example displays the following output if the current culture is en-US:
 //    Millisecond component only: 126

docs/standard/base-types/snippets/parse-strings/csharp/regex.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 public class RegExExamples
 {
@@ -20,16 +20,16 @@ public static void Example1()
                 switch (m.Groups[2].Value)
                 {
                     case "+":
-                        Console.WriteLine("{0} = {1}", m.Value, value1 + value2);
+                        Console.WriteLine($"{m.Value} = {value1 + value2}");
                         break;
                     case "-":
-                        Console.WriteLine("{0} = {1}", m.Value, value1 - value2);
+                        Console.WriteLine($"{m.Value} = {value1 - value2}");
                         break;
                     case "*":
-                        Console.WriteLine("{0} = {1}", m.Value, value1 * value2);
+                        Console.WriteLine($"{m.Value} = {value1 * value2}");
                         break;
                     case "/":
-                        Console.WriteLine("{0} = {1:N2}", m.Value, value1 / value2);
+                        Console.WriteLine($"{m.Value} = {value1 / value2:N2}");
                         break;
                 }
             }
@@ -57,7 +57,7 @@ public static void Example2()
         foreach (System.Text.RegularExpressions.Match m in
            System.Text.RegularExpressions.Regex.Matches(input, pattern))
         {
-            Console.WriteLine("{0}: {1}", ++ctr, m.Groups[1].Value);
+            Console.WriteLine($"{++ctr}: {m.Groups[1].Value}");
         }
 
         // The example displays the following output:

docs/standard/base-types/snippets/regex-backtracking/csharp/backtracking1.cs

@@ -1,4 +1,4 @@
-// <Snippet1>
+// <Snippet1>
 using System;
 using System.Text.RegularExpressions;
 
@@ -9,8 +9,7 @@ public static void Run()
         string input = "needing a reed";
         string pattern = @"e{2}\w\b";
         foreach (Match match in Regex.Matches(input, pattern))
-            Console.WriteLine("{0} found at position {1}",
-                              match.Value, match.Index);
+            Console.WriteLine($"{match.Value} found at position {match.Index}");
     }
 }
 // The example displays the following output:

docs/standard/base-types/snippets/regex-backtracking/csharp/backtracking5.cs

@@ -1,4 +1,4 @@
-// <Snippet5>
+// <Snippet5>
 using System;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
@@ -15,13 +15,13 @@ public static void Run()
         sw = Stopwatch.StartNew();
         result = Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase);
         sw.Stop();
-        Console.WriteLine("Match: {0} in {1}", result, sw.Elapsed);
+        Console.WriteLine($"Match: {result} in {sw.Elapsed}");
 
         string behindPattern = @"^[0-9A-Z][-.\w]*(?<=[0-9A-Z])@";
         sw = Stopwatch.StartNew();
         result = Regex.IsMatch(input, behindPattern, RegexOptions.IgnoreCase);
         sw.Stop();
-        Console.WriteLine("Match with Lookbehind: {0} in {1}", result, sw.Elapsed);
+        Console.WriteLine($"Match with Lookbehind: {result} in {sw.Elapsed}");
     }
 }
 // The example displays output similar to the following:

docs/standard/base-types/snippets/regex-backtracking/csharp/backtracking6.cs

@@ -1,4 +1,4 @@
-// <Snippet6>
+// <Snippet6>
 using System;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
@@ -15,13 +15,13 @@ public static void Run()
         sw = Stopwatch.StartNew();
         result = Regex.IsMatch(input, pattern, RegexOptions.IgnoreCase);
         sw.Stop();
-        Console.WriteLine("{0} in {1}", result, sw.Elapsed);
+        Console.WriteLine($"{result} in {sw.Elapsed}");
 
         string aheadPattern = @"^((?=[A-Z])\w+\.)*[A-Z]\w*$";
         sw = Stopwatch.StartNew();
         result = Regex.IsMatch(input, aheadPattern, RegexOptions.IgnoreCase);
         sw.Stop();
-        Console.WriteLine("{0} in {1}", result, sw.Elapsed);
+        Console.WriteLine($"{result} in {sw.Elapsed}");
     }
 }
 // The example displays the following output:

docs/standard/base-types/snippets/regex/csharp/compare1.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Diagnostics;
 using System.Net.Http;
 using System.Text.RegularExpressions;
@@ -37,7 +37,7 @@ public async static Task RunIt()
                 break;
         }
         sw.Stop();
-        Console.WriteLine("   {0} matches in {1}", ctr, sw.Elapsed);
+        Console.WriteLine($"   {ctr} matches in {sw.Elapsed}");
 
         // Read first ten sentences with compiled regex.
         Console.WriteLine("10 Sentences with Compiled Regex:");
@@ -54,7 +54,7 @@ public async static Task RunIt()
                 break;
         }
         sw.Stop();
-        Console.WriteLine("   {0} matches in {1}", ctr, sw.Elapsed);
+        Console.WriteLine($"   {ctr} matches in {sw.Elapsed}");
 
         // Read first ten sentences with source-generated regex.
         Console.WriteLine("10 Sentences with Source-generated Regex:");
@@ -70,7 +70,7 @@ public async static Task RunIt()
                 break;
         }
         sw.Stop();
-        Console.WriteLine("   {0} matches in {1}", ctr, sw.Elapsed);
+        Console.WriteLine($"   {ctr} matches in {sw.Elapsed}");
 
         // Read all sentences with interpreted regex.
         Console.WriteLine("All Sentences with Interpreted Regex:");
@@ -85,7 +85,7 @@ public async static Task RunIt()
             match = match.NextMatch();
         }
         sw.Stop();
-        Console.WriteLine("   {0:N0} matches in {1}", matches, sw.Elapsed);
+        Console.WriteLine($"   {matches:N0} matches in {sw.Elapsed}");
 
         // Read all sentences with compiled regex.
         Console.WriteLine("All Sentences with Compiled Regex:");
@@ -101,7 +101,7 @@ public async static Task RunIt()
             match = match.NextMatch();
         }
         sw.Stop();
-        Console.WriteLine("   {0:N0} matches in {1}", matches, sw.Elapsed);
+        Console.WriteLine($"   {matches:N0} matches in {sw.Elapsed}");
 
         // Read all sentences with source-generated regex.
         Console.WriteLine("All Sentences with Source-generated Regex:");
@@ -115,7 +115,7 @@ public async static Task RunIt()
             match = match.NextMatch();
         }
         sw.Stop();
-        Console.WriteLine("   {0:N0} matches in {1}", matches, sw.Elapsed);
+        Console.WriteLine($"   {matches:N0} matches in {sw.Elapsed}");
 
         return;
     }