Add methods.

src/EditorFeatures/CSharpTest/UseIndexOrRangeOperator/UseIndexOperatorTests.cs

@@ -326,6 +326,54 @@ void Goo(string[] s)
     {
         var v = s[^1];
     }
+}", parseOptions: s_parseOptions);
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsUseIndexOperator)]
+        public async Task TestFixAll1()
+        {
+            await TestAsync(
+@"
+class C
+{
+    void Goo(string s)
+    {
+        var v1 = s[{|FixAllInDocument:|}s.Length - 1];
+        var v2 = s[s.Length - 1];
+    }
+}",
+@"
+class C
+{
+    void Goo(string s)
+    {
+        var v1 = s[^1];
+        var v2 = s[^1];
+    }
+}", parseOptions: s_parseOptions);
+        }
+
+        [Fact, Trait(Traits.Feature, Traits.Features.CodeActionsUseIndexOperator)]
+        public async Task TestFixAll2()
+        {
+            await TestAsync(
+@"
+class C
+{
+    void Goo(string s)
+    {
+        var v1 = s[s.Length - 1];
+        var v2 = s[{|FixAllInDocument:|}s.Length - 1];
+    }
+}",
+@"
+class C
+{
+    void Goo(string s)
+    {
+        var v1 = s[^1];
+        var v2 = s[^1];
+    }
 }", parseOptions: s_parseOptions);
         }
     }

src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.cs

@@ -44,6 +44,9 @@ public CSharpUseIndexOperatorDiagnosticAnalyzer()
         {
         }
 
+        public override bool OpenFileOnly(Workspace workspace) => false;
+        public override DiagnosticAnalyzerCategory GetAnalyzerCategory() => DiagnosticAnalyzerCategory.SemanticSpanAnalysis;
+
         protected override void InitializeWorker(AnalysisContext context)
         {
             context.RegisterCompilationStartAction(startContext =>

src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseRangeOperatorDiagnosticAnalyzer.cs

@@ -40,6 +40,9 @@ public CSharpUseRangeOperatorDiagnosticAnalyzer()
         {
         }
 
+        public override bool OpenFileOnly(Workspace workspace) => false;
+        public override DiagnosticAnalyzerCategory GetAnalyzerCategory() => DiagnosticAnalyzerCategory.SemanticSpanAnalysis;
+
         protected override void InitializeWorker(AnalysisContext context)
         {
             context.RegisterCompilationStartAction(compilationContext =>