Roslyn脚本：运行时异常的行号信息

Question

Roslyn脚本：运行时异常的行号信息

4

我正在使用Roslyn脚本编写（使用Microsoft.CodeAnalysis.CSharp.Scripting nuget包），我想知道是否有一种方法可以将行号信息添加到脚本内发生异常的堆栈跟踪中。

当我运行以下C#代码时：

// using Microsoft.CodeAnalysis.CSharp.Scripting;

var code = @"
var a = 0;
var b = 1 / a;
";
try
{
    await CSharpScript.RunAsync(code);
}
catch (DivideByZeroException dbze)
{
    Console.WriteLine(dbze.StackTrace);
}

在控制台中输出的堆栈跟踪信息如下：

   at Submission#0.<<Initialize>>d__0.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Scripting.ScriptExecutionState.<RunSubmissionsAsync>d__9`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Scripting.Script`1.<RunSubmissionsAsync>d__21.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at UnitTests.ExploreRoslyn.<ScriptWithRuntimeError>d__4.MoveNext() in D:\dev\misc\netmockery\UnitTests\ExploreRoslyn.cs:line 47

请注意，如果我尝试在脚本内捕获异常，结果是类似的：

var code = @"
try  {
    var a = 0;
    var b = 1 / a;
}
catch (System.DivideByZeroException dbze)
{
    Console.WriteLine(dbze.StackTrace);
}
";
await CSharpScript.RunAsync(code);

这将输出：

at Submission#0.<<Initialize>>d__0.MoveNext()

如何让Roslyn脚本引擎在编译/执行脚本时添加调试信息，以便在堆栈跟踪中获取行号信息？请输出到控制台。

- codeape

1个回答

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- codeape · Accepted Answer

我通过发出一个带有调试信息的（内存中的）程序集来使某些东西运作起来。

示例代码：

var code = @"
var a = 0;
var b = 1 / a;
";

var script = CSharpScript.Create(code);
var compilation = script.GetCompilation();
var ilstream = new MemoryStream();
var pdbstream = new MemoryStream();
compilation.Emit(ilstream, pdbstream);

var assembly = Assembly.Load(ilstream.GetBuffer(), pdbstream.GetBuffer());
var type = assembly.GetType("Submission#0");
var factory = type.GetMethod("<Factory>");
var submissionArray = new object[2];
Task<object> task = (Task<object>)factory.Invoke(null, new object[] { submissionArray });

try
{
    await task;
}
catch (DivideByZeroException dbze)
{
    Console.WriteLine(dbze.StackTrace);
}

输出为（注意堆栈跟踪中的:line 3）:

   at Submission#0.<<Initialize>>d__0.MoveNext() in :line 3
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at UnitTests.ExploreRoslyn.<ExploreEmittingAssembly>d__13.MoveNext() in D:\dev\misc\netmockery\UnitTests\ExploreRoslyn.cs:line 151

显然，这有点像一个hack，而且我并不满意硬编码的脚本引擎实现细节（Submission#0，<Factory>），而且我真的不知道我在做什么。可能会有更好的方法（也许已经有了？）。

更新：在Roslyn问题跟踪器中创建了问题https://github.com/dotnet/roslyn/issues/13482。