Modify CSharpCodeWriter to generate async lambdas for section

Fixes #85

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/CSharpCodeWriter.cs

@@ -284,13 +284,23 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
             return new CSharpCodeWritingScope(this);
         }
 
-        public CSharpCodeWritingScope BuildLambda(params string[] parameterNames)
-        {
-            return BuildLambda(true, parameterNames);
-        }
-
         public CSharpCodeWritingScope BuildLambda(bool endLine, params string[] parameterNames)
         {
+            return BuildLambda(endLine, async: false, parameterNames: parameterNames);
+        }
+
+        public CSharpCodeWritingScope BuildAsyncLambda(bool endLine, params string[] parameterNames)
+        {
+            return BuildLambda(endLine, async: true, parameterNames: parameterNames);
+        }
+
+        private CSharpCodeWritingScope BuildLambda(bool endLine, bool async, string[] parameterNames)
+        {
+            if (async)
+            {
+                Write("async");
+            }
+
             Write("(").Write(string.Join(", ", parameterNames)).Write(") => ");
 
             var scope = new CSharpCodeWritingScope(this);

src/Microsoft.AspNet.Razor/Generator/Compiler/CodeBuilder/CSharp/Visitors/CSharpCodeVisitor.cs

@@ -320,19 +320,16 @@ namespace Microsoft.AspNet.Razor.Generator.Compiler.CSharp
         {
             Writer.WriteStartMethodInvocation(Context.Host.GeneratedClassContext.DefineSectionMethodName)
                    .WriteStringLiteral(chunk.Name)
-                   .WriteParameterSeparator()
+                   .WriteParameterSeparator();
-                   .WriteStartNewObject(Context.Host.GeneratedClassContext.TemplateTypeName);
 
             var currentTargetWriterName = Context.TargetWriterName;
             Context.TargetWriterName = TemplateWriterName;
 
-            using (Writer.BuildLambda(endLine: false, parameterNames: TemplateWriterName))
+            using (Writer.BuildAsyncLambda(endLine: false, parameterNames: TemplateWriterName))
             {
                 Accept(chunk.Children);
             }
             Context.TargetWriterName = currentTargetWriterName;
-
-            Writer.WriteEndMethodInvocation(endLine: false);
             Writer.WriteEndMethodInvocation();
         }
 

test/Microsoft.AspNet.Razor.Test/Generator/CSharpRazorCodeGeneratorTest.cs

@@ -294,7 +294,7 @@ namespace Microsoft.AspNet.Razor.Test.Generator
                 BuildLineMapping(113, 7, 2, 1262, 71, 6, 12),
                 BuildLineMapping(129, 8, 1, 1343, 76, 6, 4),
                 BuildLineMapping(142, 8, 1443, 78, 14, 3),
-                BuildLineMapping(204, 13, 5, 1638, 90, 6, 3)
+                BuildLineMapping(204, 13, 5, 1630, 90, 6, 3)
             });
         }
 

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/DesignTime.cs

@@ -86,14 +86,14 @@ __o = Foo(item => new Template((__razor_template_writer) => {
 
 #line default
 #line hidden
-            DefineSection("Footer", new Template((__razor_template_writer) => {
+            DefineSection("Footer", async(__razor_template_writer) => {
 #line 14 "DesignTime.cshtml"
 __o = bar;
 
 #line default
 #line hidden
             }
-            ));
+            );
         }
         #pragma warning restore 1998
     }

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/ResolveUrl.cs

@@ -92,7 +92,7 @@ namespace TestOutput
             Instrumentation.BeginContext(474, 4, true);
             WriteLiteral("\r\n\r\n");
             Instrumentation.EndContext();
-            DefineSection("Foo", new Template((__razor_template_writer) => {
+            DefineSection("Foo", async(__razor_template_writer) => {
                 Instrumentation.BeginContext(492, 8, true);
                 WriteLiteralTo(__razor_template_writer, "\r\n    <a");
                 Instrumentation.EndContext();
@@ -126,7 +126,7 @@ namespace TestOutput
                 WriteLiteralTo(__razor_template_writer, ">Crazy Url!</a>\r\n");
                 Instrumentation.EndContext();
             }
-            ));
+            );
         }
         #pragma warning restore 1998
     }

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/Sections.cs

@@ -24,21 +24,21 @@ namespace TestOutput
             Instrumentation.BeginContext(47, 33, true);
             WriteLiteral("\r\n\r\n<div>This is in the Body>\r\n\r\n");
             Instrumentation.EndContext();
-            DefineSection("Section2", new Template((__razor_template_writer) => {
+            DefineSection("Section2", async(__razor_template_writer) => {
                 Instrumentation.BeginContext(99, 39, true);
                 WriteLiteralTo(__razor_template_writer, "\r\n    <div>This is in Section 2</div>\r\n");
                 Instrumentation.EndContext();
             }
-            ));
+            );
             Instrumentation.BeginContext(141, 2, true);
             WriteLiteral("\r\n");
             Instrumentation.EndContext();
-            DefineSection("Section1", new Template((__razor_template_writer) => {
+            DefineSection("Section1", async(__razor_template_writer) => {
                 Instrumentation.BeginContext(162, 39, true);
                 WriteLiteralTo(__razor_template_writer, "\r\n    <div>This is in Section 1</div>\r\n");
                 Instrumentation.EndContext();
             }
-            ));
+            );
         }
         #pragma warning restore 1998
     }

test/Microsoft.AspNet.Razor.Test/TestFiles/CodeGenerator/CS/Output/TagHelpersInSection.cs

@@ -34,7 +34,7 @@ namespace TestOutput
             Instrumentation.BeginContext(63, 4, true);
             WriteLiteral("\r\n\r\n");
             Instrumentation.EndContext();
-            DefineSection("MySection", new Template((__razor_template_writer) => {
+            DefineSection("MySection", async(__razor_template_writer) => {
                 Instrumentation.BeginContext(87, 21, true);
                 WriteLiteralTo(__razor_template_writer, "\r\n    <div>\r\n        ");
                 Instrumentation.EndContext();
@@ -90,7 +90,7 @@ Write(DateTime.Now);
                 WriteLiteralTo(__razor_template_writer, "\r\n    </div>\r\n");
                 Instrumentation.EndContext();
             }
-            ));
+            );
         }
         #pragma warning restore 1998
     }