Add rule to use range operator

.editorconfig

@@ -218,6 +218,9 @@ csharp_style_prefer_index_operator = true:error
 # IDE0032: Use auto property
 dotnet_style_prefer_auto_properties = true:error
 
+# IDE0057: Use range operator
+csharp_style_prefer_range_operator = true:error
+
 [*.xaml]
 indent_style = space
 indent_size = 2

WalletWasabi.Gui/Behaviors/BindSelectedTextBehavior.cs

@@ -37,7 +37,7 @@ namespace WalletWasabi.Gui.Behaviors
 			{
 				return "";
 			}
-			return text.Substring(start, end - start);
+			return text[start..end];
 		}
 
 		protected override void OnAttached()

WalletWasabi.Gui/Controls/LockScreen/PinLockScreenViewModel.cs

@@ -41,7 +41,7 @@ namespace WalletWasabi.Gui.Controls.LockScreen
 				{
 					if (PinInput.Length > 0)
 					{
-						PinInput = PinInput.Substring(0, PinInput.Length - 1);
+						PinInput = PinInput[0..^1];
 					}
 				}
 				else if (arg == "CLEAR")

WalletWasabi.Packager/Program.cs

@@ -575,7 +575,7 @@ namespace WalletWasabi.Packager
 						process.WaitForExit();
 					}
 
-					var daemonExePath = newExecutablePath.Substring(0, newExecutablePath.Length - 4) + "d.exe";
+					var daemonExePath = newExecutablePath[0..^4] + "d.exe";
 					File.Copy(newExecutablePath, daemonExePath);
 
 					// Do not open console.

WalletWasabi/Helpers/PasswordHelper.cs

@@ -31,7 +31,7 @@ namespace WalletWasabi.Helpers
 			{
 				originalPassword,
 				buggyClipboard, // Should be here for every OP system. If I create a buggy wallet on OSX and transfer it to other system, it should also work.
-				$"{buggyClipboard.Substring(0,buggyClipboard.Length-1)}\ufffd" // Later I tested the functionality and experienced that the last character replaced by invalid character.
+				$"{buggyClipboard[0..^1]}\ufffd" // Later I tested the functionality and experienced that the last character replaced by invalid character.
 			};
 
 			return possiblePasswords.ToArray();

WalletWasabi/Mono/Option.cs

@@ -370,7 +370,7 @@ namespace Mono.Options
 								nameof(Prototype));
 						}
 
-						seps.Add(name.Substring(start, i - start));
+						seps.Add(name[start..i]);
 						start = -1;
 						break;
 

WalletWasabi/Mono/OptionSet.cs

@@ -659,7 +659,7 @@ namespace Mono.Options
 			Option p;
 			string rn;
 			if (n.Length >= 1 && (n[^1] == '+' || n[^1] == '-') &&
-					Contains((rn = n.Substring(0, n.Length - 1))))
+					Contains((rn = n[0..^1])))
 			{
 				p = this[rn];
 				string v = n[^1] == '+' ? option : null;
@@ -968,7 +968,7 @@ namespace Mono.Options
 						}
 						else
 						{
-							sb.Append(description.Substring(start, i - start));
+							sb.Append(description[start..i]);
 							start = -1;
 						}
 						break;

WalletWasabi/Mono/StringCoda.cs

@@ -206,7 +206,7 @@ namespace Mono.Options
 					--end;
 					continuation = "-";
 				}
-				string line = self.Substring(start, end - start) + continuation;
+				string line = self[start..end] + continuation;
 				yield return line;
 				start = end;
 				if (char.IsWhiteSpace(c))