Add ExpandParamsArguments DecompilerSettings

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -146,6 +146,7 @@
     <Compile Include="TestCases\ILPretty\Issue3442.cs" />
     <Compile Include="TestCases\ILPretty\Issue3466.cs" />
     <Compile Include="TestCases\ILPretty\Issue3524.cs" />
+    <Compile Include="TestCases\Pretty\ExpandParamsArgumentsDisabled.cs" />
     <Compile Include="TestCases\Pretty\ExtensionProperties.cs" />
     <None Include="TestCases\ILPretty\Issue3504.cs" />
     <Compile Include="TestCases\ILPretty\MonoFixed.cs" />

ICSharpCode.Decompiler.Tests/PrettyTestRunner.cs

@@ -617,6 +617,12 @@ public async Task ParamsCollections([ValueSource(nameof(roslyn4OrNewerOptions))]
 			await RunForLibrary(cscOptions: cscOptions);
 		}
 
+		[Test]
+		public async Task ExpandParamsArgumentsDisabled([ValueSource(nameof(defaultOptions))] CompilerOptions cscOptions)
+		{
+			await RunForLibrary(cscOptions: cscOptions, configureDecompiler: settings => settings.ExpandParamsArguments = false);
+		}
+
 		[Test]
 		public async Task Issue1080([ValueSource(nameof(roslynOnlyOptions))] CompilerOptions cscOptions)
 		{

ICSharpCode.Decompiler.Tests/TestCases/Pretty/ExpandParamsArgumentsDisabled.cs

@@ -0,0 +1,17 @@
+using System;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
+{
+	public class ExpandParamsArgumentsDisabled
+	{
+		public void Test()
+		{
+			MethodWithParams(Array.Empty<int>());
+			MethodWithParams(new int[1] { 5 });
+		}
+
+		public void MethodWithParams(params int[] b)
+		{
+		}
+	}
+}

ICSharpCode.Decompiler/CSharp/CallBuilder.cs

@@ -969,7 +969,7 @@ private ArgumentList BuildArgumentList(ExpectedTargetDetails expectedTargetDetai
 				{
 					firstOptionalArgumentIndex = -2;
 				}
-				if (parameter.IsParams && i + 1 == callArguments.Count && argumentToParameterMap == null)
+				if (expressionBuilder.settings.ExpandParamsArguments && parameter.IsParams && i + 1 == callArguments.Count && argumentToParameterMap == null)
 				{
 					// Parameter is marked params
 					// If the argument is an array creation, inline all elements into the call and add missing default values.

ICSharpCode.Decompiler/DecompilerSettings.cs

@@ -1703,6 +1703,25 @@ public bool OptionalArguments {
 			}
 		}
 
+		bool expandParamsArguments = true;
+
+		/// <summary>
+		/// Gets/Sets whether to expand <c>params</c> arguments by replacing explicit array creation
+		/// with individual values in method calls.
+		/// </summary>
+		[Category("C# 1.0 / VS .NET")]
+		[Description("DecompilerSettings.ExpandParamsArguments")]
+		public bool ExpandParamsArguments {
+			get { return expandParamsArguments; }
+			set {
+				if (expandParamsArguments != value)
+				{
+					expandParamsArguments = value;
+					OnPropertyChanged();
+				}
+			}
+		}
+
 		bool localFunctions = true;
 
 		/// <summary>

ILSpy/Properties/Resources.resx

@@ -360,6 +360,9 @@ Are you sure you want to continue?</value>
   <data name="DecompilerSettings.DoWhileStatement" xml:space="preserve">
     <value>Transform to do-while, if possible</value>
   </data>
+  <data name="DecompilerSettings.ExpandParamsArguments" xml:space="preserve">
+	  <value>Expand params arguments by removing explicit array creation</value>
+  </data>
   <data name="DecompilerSettings.FSpecificOptions" xml:space="preserve">
     <value>F#-specific options</value>
   </data>