fix: null reference exception when code includes comments

Author: jevonsflash

RoslynSyntaxTool/Manager/CompilationUtilitys.cs

@@ -24,9 +24,10 @@ public static MemoryStream CompileClientProxy(IEnumerable<SyntaxTree> trees)
                 MetadataReference.CreateFromFile(typeof(SyntaxFactory).GetTypeInfo().Assembly.Location)
             };
             var assemblies = AppDomain.CurrentDomain.GetAssemblies().ToList();
-            var allReferences = assemblies.Where(c => !c.IsDynamic).Select(x => { 
-                var f = MetadataReference.CreateFromFile(x.Location); 
-                return f; 
+            var allReferences = assemblies.Where(c => !c.IsDynamic).Select(x =>
+            {
+                var f = MetadataReference.CreateFromFile(x.Location);
+                return f;
             }).Concat(references);
             return Compile(AssemblyInfo.Create("RoslynSyntaxTool.Proxy.ConvertToCSharpProxy"), trees, allReferences);
         }
@@ -44,11 +45,8 @@ public static MemoryStream Compile(string assemblyName, AssemblyInfo assemblyInf
             var result = compilation.Emit(stream);
             if (!result.Success)
             {
-                foreach (var message in result.Diagnostics.Select(i => i.ToString()))
-                {
-                    System.Console.WriteLine(message);
-                }
-                return null;
+                var msgs = result.Diagnostics.Select(i => i.ToString());
+                throw new Exception("语法树动态编译出错\r\n===Start===\r\n"+ string.Join("\r\n", msgs)+"\r\n===End===\r\n请将源码和报错信息反馈至开发者，谢谢\r\n\r\n");
             }
             stream.Seek(0, SeekOrigin.Begin);
             return stream;

RoslynSyntaxTool/ViewModel/ConvertToCSharpPageViewModel.cs

@@ -10,6 +10,7 @@
 using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
+using ControlzEx.Standard;
 using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.AvalonEdit.Highlighting;
 using Microsoft.CodeAnalysis;
@@ -88,6 +89,20 @@ private void ContinueAction()
 .WithUsings(
     SyntaxFactory.List<UsingDirectiveSyntax>(
         new UsingDirectiveSyntax[]{
+            SyntaxFactory.UsingDirective(
+                    SyntaxFactory.IdentifierName("System"))
+            .WithUsingKeyword(
+                SyntaxFactory.Token(
+                    SyntaxFactory.TriviaList(),
+                    SyntaxKind.UsingKeyword,
+                    SyntaxFactory.TriviaList(
+                        SyntaxFactory.Space)))
+            .WithSemicolonToken(
+                SyntaxFactory.Token(
+                    SyntaxFactory.TriviaList(),
+                    SyntaxKind.SemicolonToken,
+                    SyntaxFactory.TriviaList(
+                        SyntaxFactory.CarriageReturnLineFeed))),
             SyntaxFactory.UsingDirective(
                 SyntaxFactory.QualifiedName(
                     SyntaxFactory.IdentifierName("Microsoft"),
@@ -264,39 +279,46 @@ private void ContinueAction()
 
 
                         var stream = CompilationUtilitys.CompileClientProxy(new List<SyntaxTree>() { treeFrame });
-
-                        using (stream)
+                        if (stream!=null)
                         {
-                            var assembly = Assembly.Load(stream.ToArray());
-                            _generatedServiceProxyAssembly = assembly;
+                            using (stream)
+                            {
+                                var assembly = Assembly.Load(stream.ToArray());
+                                _generatedServiceProxyAssembly = assembly;
 
-                        }
-                        var serviceProxyTypes = _generatedServiceProxyAssembly.GetExportedTypes();
+                            }
+                            var serviceProxyTypes = _generatedServiceProxyAssembly.GetExportedTypes();
 
-                        object serviceProxyObject = null;
-                        Type serviceProxyObjectType = null;
+                            object serviceProxyObject = null;
+                            Type serviceProxyObjectType = null;
 
-                        foreach (var serviceProxyType in serviceProxyTypes)
-                        {
-                            var typeInfo = serviceProxyType.GetTypeInfo();
-                            if (typeInfo.FullName=="RoslynSyntaxTool.Process.ProxyTreeGen")
+                            foreach (var serviceProxyType in serviceProxyTypes)
                             {
-                                serviceProxyObjectType=serviceProxyType;
-                                var instance = serviceProxyType.GetTypeInfo().GetConstructors().First().Invoke(null);
-                                serviceProxyObject=instance;
-                            }
+                                var typeInfo = serviceProxyType.GetTypeInfo();
+                                if (typeInfo.FullName=="RoslynSyntaxTool.Process.ProxyTreeGen")
+                                {
+                                    serviceProxyObjectType=serviceProxyType;
+                                    var instance = serviceProxyType.GetTypeInfo().GetConstructors().First().Invoke(null);
+                                    serviceProxyObject=instance;
+                                }
 
 
 
+                            }
+                            var result = "没有结果，请检查输入代码";
+                            var processor = serviceProxyObjectType.GetMethod("Process");
+                            if (processor!=null)
+                            {
+                                result = processor.Invoke(serviceProxyObject, null).ToString();
+                            }
+
+                            responseText =result;
                         }
-                        var result = "没有结果，请检查输入代码";
-                        var processor = serviceProxyObjectType.GetMethod("Process");
-                        if (processor!=null)
+                        else
                         {
-                            result = processor.Invoke(serviceProxyObject, null).ToString();
-                        }
+                            responseText ="语法树动态编译出错，检查 EmitResult.Diagnostics 属性。请将源码和报错信息反馈至开发者，谢谢";
 
-                        responseText =result;
+                        }
                     }
                     catch (Exception ex)
                     {