如何使用Microsoft.CodeAnalysis.Diagnostic获取错误行

Question

我希望你有美好的一天。我有一段代码用于在运行时评估代码：

SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText("Code goes here...");
string assemblyName = Path.GetRandomFileName();

            string corePath = Path.GetDirectoryName(typeof(object).GetTypeInfo().Assembly.Location);
            MetadataReference[] references = new MetadataReference[]
            {
                MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location),
                MetadataReference.CreateFromFile("Newtonsoft.Json.dll"),
                MetadataReference.CreateFromFile(Path.Combine(corePath, "System.Net.dll")),
                MetadataReference.CreateFromFile(Path.Combine(corePath, "System.Text.RegularExpressions.dll"))
            };

            CSharpCompilation compilation = CSharpCompilation.Create(
                assemblyName,
                syntaxTrees: new[] { syntaxTree },
                references: references,
                options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary));

            using (var ms = new MemoryStream())
            {
                EmitResult result = compilation.Emit(ms);

                if (!result.Success)
                {
                    IEnumerable<Diagnostic> failures = result.Diagnostics.Where(diagnostic =>
                        diagnostic.IsWarningAsError ||
                        diagnostic.Severity == DiagnosticSeverity.Error);

                    string errors = "";

                    foreach (Diagnostic diagnostic in failures)
                    {
                        errors += "<span style=\"text-align: center;\">Error <b>" + diagnostic.Id + "</b>: " + diagnostic.GetMessage() + "</span><br>";
                    }

                    return errors;
                }
                else
                {
                    ms.Seek(0, SeekOrigin.Begin);
                    Assembly assembly = Assembly.Load(ms.ToArray());

                    Type type = assembly.GetType("NoteBoxCode.Program");
                    object obj = Activator.CreateInstance(type);
                    return type.InvokeMember("Main", BindingFlags.InvokeMethod, null, obj, null);
                }
            }

例如，当我得到一个错误时，它只会显示这个：Error CS1520: Method must have a return type

如何获得像Error on line 2 CS1520: Method must have a return type这样的输出

我尝试过diagnostic.Location，但我认为它返回的是装配线位置，这是我不需要的。有什么帮助吗？

Answer 1

因此，CSharpCompilationOptions不能返回错误行，因为它是运行时错误。我需要一个高级调试类来分别调试和运行每一行代码，这就是(我认为) visual studio所做的。

您可以使用SyntaxTree.GetDiagnostics()来获取语法错误的概述。但是，这不会返回编译错误，例如Console.WritLine而不是Console.WriteLine。