ASP.NET"黄色死亡屏幕"如何显示代码？

Question

我以为.Net代码被编译成MSIL,所以我总是想知道黄色屏幕是如何产生错误的代码的.如果它正在执行已编译的代码,编译器如何能够从错误消息中的源文件生成代码？

随意编辑这个问题/标题,我知道它没有意义.

Answer 1

.Net程序集编译时包含有关所包含字节码的元数据,这些元数据允许轻松反编译代码 - 这就是.Net Reflector等工具的工作方式.PDB文件只是调试符号 - 黄色死亡屏幕的区别在于您将获得堆栈跟踪中的行号.

换句话说,即使PDB文件丢失,您也会获得代码.

Answer 2

像这样.我做了一些改动,但它与ms正在做的非常接近.

// reverse the stack
private static Stack<Exception> GenerateExceptionStack(Exception exception)
{
    var exceptionStack = new Stack<Exception>();

    // create exception stack
    for (Exception e = exception; e != null; e = e.InnerException)
    {
        exceptionStack.Push(e);
    }

    return exceptionStack;
}

// render stack
private static string GenerateFormattedStackTrace(Stack<Exception> exceptionStack)
{
    StringBuilder trace = new StringBuilder();

    try
    {
        // loop through exception stack
        while (exceptionStack.Count != 0)
        {
            trace.Append("\r\n");

            // render exception type and message
            Exception ex = exceptionStack.Pop();
            trace.Append("[" + ex.GetType().Name);
            if (!string.IsNullOrEmpty(ex.Message))
            {
                trace.Append(":" + ex.Message);
            }
            trace.Append("]\r\n");

            // Load stack trace
            StackTrace stackTrace = new StackTrace(ex, true);
            for (int frame = 0; frame < stackTrace.FrameCount; frame++)
            {
                StackFrame stackFrame = stackTrace.GetFrame(frame);
                MethodBase method = stackFrame.GetMethod();
                Type declaringType = method.DeclaringType;
                string declaringNamespace = "";

                // get declaring type information
                if (declaringType != null)
                {
                    declaringNamespace = declaringType.Namespace ?? "";
                }

                // add namespace
                if (!string.IsNullOrEmpty(declaringNamespace))
                {
                    declaringNamespace += ".";
                }

                // add method
                if (declaringType == null)
                {
                    trace.Append(" " + method.Name + "(");
                }
                else
                {
                    trace.Append(" " + declaringNamespace + declaringType.Name + "." + method.Name + "(");
                }

                // get parameter information
                ParameterInfo[] parameters = method.GetParameters();
                for (int paramIndex = 0; paramIndex < parameters.Length; paramIndex++)
                {
                    trace.Append(((paramIndex != 0) ? "," : "") + parameters[paramIndex].ParameterType.Name + " " + parameters[paramIndex].Name);
                }
                trace.Append(")");


                // get information
                string fileName = stackFrame.GetFileName() ?? "";

                if (!string.IsNullOrEmpty(fileName))
                {
                    trace.Append(string.Concat(new object[] { " in ", fileName, ":", stackFrame.GetFileLineNumber() }));
                }
                else
                {
                    trace.Append(" + " + stackFrame.GetNativeOffset());
                }

                trace.Append("\r\n");
            }
        }
    }
    catch
    {
    }

    if (trace.Length == 0)
    {
        trace.Append("[stack trace unavailable]");
    }

    // return html safe stack trace
    return HttpUtility.HtmlEncode(trace.ToString()).Replace(Environment.NewLine, "<br>");
}