Fix MA0183 false-positive with params array arguments in string.Format

src/Meziantou.Analyzer/Rules/StringFormatShouldBeConstantAnalyzer.cs

@@ -77,7 +77,20 @@ private static void Analyze(OperationAnalysisContext context)
         {
             var arg = operation.Arguments[i];
 
-            // Skip implicit arguments (e.g., empty params array)
+            // Check if this is a params array argument
+            if (arg.ArgumentKind == ArgumentKind.ParamArray && arg.Value is IArrayCreationOperation arrayCreation)
+            {
+                // Check if the array has any elements
+                if (arrayCreation.Initializer is not null && arrayCreation.Initializer.ElementValues.Length > 0)
+                {
+                    hasFormattingArguments = true;
+                    break;
+                }
+                // Skip empty params arrays
+                continue;
+            }
+
+            // Skip other implicit arguments
             if (arg.IsImplicit)
                 continue;
 

tests/Meziantou.Analyzer.Test/Rules/StringFormatShouldBeConstantAnalyzerTests.cs

@@ -419,4 +419,44 @@ void Method()
                 """)
             .ValidateAsync();
     }
+
+    [Fact]
+    public async Task StringFormat_WithIFormatProviderAndMultiplePlaceholders_ShouldNotReportDiagnostic()
+    {
+        await CreateProjectBuilder()
+            .WithSourceCode("""
+                using System;
+                using System.Globalization;
+
+                class Program
+                {
+                    private static string DebuggerDisplay => string.Format(CultureInfo.InvariantCulture, "Column: {0}, Value: {1}, Invalid: {2}, Blank: {3}", "Column", "Value", true, false);
+
+                    static void Main(string[] args)
+                    {
+                        Console.WriteLine(DebuggerDisplay);
+                    }
+                }
+                """)
+            .ValidateAsync();
+    }
+
+    [Fact]
+    public async Task StringFormat_WithExplicitEmptyParamsArray_ShouldReportDiagnostic()
+    {
+        await CreateProjectBuilder()
+            .WithSourceCode("""
+                using System;
+                using System.Globalization;
+
+                class Test
+                {
+                    void Method()
+                    {
+                        var result = [|string.Format(CultureInfo.InvariantCulture, "no placeholders", new object[0])|];
+                    }
+                }
+                """)
+            .ValidateAsync();
+    }
 }