Write directly to a file so it has associated pdb path

src/Avalonia.Build.Tasks/CompileAvaloniaXamlTask.cs

@@ -34,22 +34,15 @@ namespace Avalonia.Build.Tasks
 
             var res = XamlCompilerTaskExecutor.Compile(BuildEngine, input,
                 File.ReadAllLines(ReferencesFilePath).Where(l => !string.IsNullOrWhiteSpace(l)).ToArray(),
-                ProjectDirectory);
+                ProjectDirectory, OutputPath);
             if (!res.Success)
                 return false;
-            if (res.Data == null)
+            if (!res.WrittenFile)
             {
                 File.Copy(input, OutputPath, true);
                 if(File.Exists(inputPdb))
                     File.Copy(inputPdb, OutputPath, true);
             }
-            else
-            {
-                File.WriteAllBytes(OutputPath, res.Data);
-                if (res.Symbols != null)
-                    File.WriteAllBytes(outputPdb, res.Symbols);
-            }
-
             return true;
         }
 

src/Avalonia.Build.Tasks/XamlCompilerTaskExecutor.cs

@@ -29,18 +29,17 @@ namespace Avalonia.Build.Tasks
         public class CompileResult
         {
             public bool Success { get; set; }
-            public byte[] Data { get; set; }
+            public bool WrittenFile { get; }
-            public byte[] Symbols { get; }
 
-            public CompileResult(bool success, byte[] data = null, byte[] symbols = null)
+            public CompileResult(bool success, bool writtenFile = false)
             {
                 Success = success;
-                Data = data;
+                WrittenFile = writtenFile;
-                Symbols = symbols;
             }
         }
         
-        public static CompileResult Compile(IBuildEngine engine, string input, string[] references, string projectDirectory)
+        public static CompileResult Compile(IBuildEngine engine, string input, string[] references, string projectDirectory,
+            string output)
         {
             var typeSystem = new CecilTypeSystem(references.Concat(new[] {input}), input);
             var asm = typeSystem.TargetAssemblyDefinition;
@@ -284,16 +283,13 @@ namespace Avalonia.Build.Tasks
             loaderDispatcherMethod.Body.Instructions.Add(Instruction.Create(OpCodes.Ldnull));
             loaderDispatcherMethod.Body.Instructions.Add(Instruction.Create(OpCodes.Ret));
             
-            var ms = new MemoryStream();
+            asm.Write(output, new WriterParameters
-            var symbolStream = new MemoryStream();
-            asm.Write(ms, new WriterParameters
             {
-                SymbolStream = symbolStream,
                 WriteSymbols = true,
-                SymbolWriterProvider = new PortablePdbWriterProvider()
+                SymbolWriterProvider = new PortablePdbWriterProvider(),
             });
 
-            return new CompileResult(true, ms.ToArray(), symbolStream.Length == 0 ? null : symbolStream.ToArray());
+            return new CompileResult(true, true);
         }
         
     }