diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -369,6 +369,17 @@
     if (!Style.isCSharp())
       return false;
 
+    // `identifier[i]` is not an attribute.
+    if (Tok.Previous && Tok.Previous->is(tok::identifier))
+      return false;
+
+    // Chains [] in of `identifier[i][j][k]` are not attributes.
+    if (Tok.Previous && Tok.Previous->is(tok::r_square)) {
+      auto *MatchingParen = Tok.Previous->MatchingParen;
+      if (!MatchingParen || MatchingParen->is(TT_ArraySubscriptLSquare))
+        return false;
+    }
+
     const FormatToken *AttrTok = Tok.Next;
     if (!AttrTok)
       return false;
diff --git a/clang/unittests/Format/FormatTestCSharp.cpp b/clang/unittests/Format/FormatTestCSharp.cpp
--- a/clang/unittests/Format/FormatTestCSharp.cpp
+++ b/clang/unittests/Format/FormatTestCSharp.cpp
@@ -628,5 +628,13 @@
                Style); // An array of a nullable type.
 }
 
+TEST_F(FormatTestCSharp, CSharpArraySubscripts) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
+
+  // Do not format array subscript operators as attributes.
+  verifyFormat(R"(if (someThings[index].Contains(myThing)) {)", Style);
+  verifyFormat(R"(if (someThings[i][j][k].Contains(myThing)) {)", Style);
+}
+
 } // namespace format
 } // end namespace clang