Index: clang/lib/Format/UnwrappedLineParser.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineParser.cpp
+++ clang/lib/Format/UnwrappedLineParser.cpp
@@ -1623,6 +1623,17 @@
   // FIXME: Once we have an expression parser in the UnwrappedLineParser,
   // replace this by using parseAssigmentExpression() inside.
   do {
+    if (Style.isCSharp()) {
+      if (FormatTok->is(TT_JsFatArrow)) {
+        nextToken();
+        // Fat arrows can be followed by simple expressions or by child blocks
+        // in curly braces.
+        if (FormatTok->is(tok::l_brace)) {
+          parseChildBlock();
+          continue;
+        }
+      }
+    }
     if (Style.Language == FormatStyle::LK_JavaScript) {
       if (FormatTok->is(Keywords.kw_function) ||
           FormatTok->startsSequence(Keywords.kw_async, Keywords.kw_function)) {
@@ -1946,7 +1957,7 @@
                      DeclarationScopeStack.size() > 1);
     parseBlock(/*MustBeDeclaration=*/true, AddLevel);
     // Munch the semicolon after a namespace. This is more common than one would
-    // think. Puttin the semicolon into its own line is very ugly.
+    // think. Putting the semicolon into its own line is very ugly.
     if (FormatTok->Tok.is(tok::semi))
       nextToken();
     addUnwrappedLine();
@@ -1957,6 +1968,22 @@
 void UnwrappedLineParser::parseNew() {
   assert(FormatTok->is(tok::kw_new) && "'new' expected");
   nextToken();
+
+  if (Style.isCSharp()) {
+    do {
+      if (FormatTok->is(tok::l_brace))
+        parseBracedList();
+
+      if (FormatTok->is(tok::l_paren))
+        parseParens();
+
+      if (FormatTok->isOneOf(tok::semi, tok::comma))
+        return;
+
+      nextToken();
+    } while (!eof());
+  }
+
   if (Style.Language != FormatStyle::LK_Java)
     return;
 
Index: clang/unittests/Format/FormatTestCSharp.cpp
===================================================================
--- clang/unittests/Format/FormatTestCSharp.cpp
+++ clang/unittests/Format/FormatTestCSharp.cpp
@@ -537,6 +537,14 @@
                              Colour = Colours.Yellow,
                          } };)",
                Style);
+
+  // Lambdas can be supplied as initialiser arguments.
+  verifyFormat(R"(//
+private Transformer _transformer = new X.Y {
+    Filler = (Shape shape) => { return new Transform.Fill(shape, RED); },
+    Scaler = (Shape shape) => { return new Transform.Resize(shape, 0.1); },
+};)",
+               Style);
 }
 
 TEST_F(FormatTestCSharp, CSharpNamedArguments) {