如果在升级到 Windows 10 或.NET Framework 4.7.1后，您发现在运行使用System.Diagnostics.StackFrame类的^{(System.Diagnostics.StackFrame)}.NET Framework 应用程序时性能显着下降，那么您可能会对这篇文章感兴趣。我们将查看原因，然后提供已知的错误修复。

System.Diagnostics.StackFrame 性能下降

在.NET Framework 4.7^{(.NET Framework 4.7)}或更早版本上运行具有可接受性能的应用程序在.NET Framework 4.7.1上运行时执行速度较慢。应用程序在抛出 .NET 异常时通常依赖于 StackFrame。如果这种情况以很高的速度发生（每秒超过 10 个事件），应用程序可能会显着减慢（十倍）并且运行速度明显比以前慢。

System.Diagnostics.StackFrame 性能下降的原因^{(Cause of the System.Diagnostics.StackFrame performance degrade)}

Windows 10中的.NET Framework 4.7.1添加了对检测和解析 Portable PDB文件格式的支持，以在堆栈跟踪中显示文件和行号信息。作为此更改的一部分，堆栈跟踪中的每个函数都会检查其定义模块以确定该模块是否使用可移植PDB格式。由于^(Due)内部缓存策略的一些差异，运行时搜索Portable PDB^{(Portable PDBs)}所花费的时间比以前的 .NET Framework版本搜索经典Windows PDB^{(Windows PDBs)}所花费的时间要多得多。

这会导致格式化堆栈跟踪的生成速度比以前慢。

此问题不会更改引发的异常数。但是，它确实显着降低了应用程序处理这些异常的能力。

已知使用IKVM库的应用程序在探测程序集时会受到此问题的影响。已知探测程序集会导致异常。

修复 System.Diagnostics.StackFrame^{(Fix System.Diagnostics.StackFrame)}性能下降问题

若要解决此问题，Microsoft建议使用以下任一方法。

1] 为 StackFrame 使用不同的构造函数，它接受一个布尔参数^{(1] Use a different constructor for StackFrame that takes a Boolean argument)}

这是首选的解决方案。

如果应用程序开发人员能够对其应用程序进行更改，请调用^{(call the)} System.Diagnostics.StackTrace。#ctor( Boolean ) 构造函数通过使用 false 参数来避免捕获源信息。这避免了性能下降的代码部分。

2]回滚或升级到最新的Windows 10版本^{(2]  Rollback or upgrade to the latest Windows 10 version)}

在此方法中，如果您遇到此问题并且当前未运行最新版本的 Windows 10 ，请^{(Windows 10)}回滚到以前的版本/内部版本或upgrade to the latest version/build版本^{(Windows 10)}。如果存在.NET Framework 4.7.1，请从您的计算机上卸载，然后下载^(download)并安装以前版本或最新版本的.NET Framework。

Hope this helps!

System.Diagnostics.StackFrame performance degrade in Windows 10

Іf after you upgrade to Windows 10 or .NET Framework 4.7.1, and you notice a significant dеcrease in performance when you run .NET Framework appliсations that use the System.Diagnostics.StackFrame class, then this post might interest you. We will look at the cause, and then offer known fixes for the error.

System.Diagnostics.StackFrame performance degrade

An application that had acceptable performance running on the .NET Framework 4.7 or earlier versions executes more slowly when running on the .NET Framework 4.7.1. Applications typically rely on StackFrame when they throw .NET exceptions. If this occurs at a high rate (more than 10 incidents per second), applications can slow down significantly (tenfold) and run noticeably slower than before.

Cause of the System.Diagnostics.StackFrame performance degrade

The .NET Framework 4.7.1 in Windows 10 added support for detecting and parsing the Portable PDB file format to show file and line number information in stack traces. As part of this change, each function in a stack trace has its defining module checked to determine if that module uses the Portable PDB format. Due to some differences in the internal caching policy, the runtime spends far more time searching for Portable PDBs than previous .NET Framework versions spent searching for classic Windows PDBs.

This causes formatted stack traces to be produced more slowly than before.

This issue does not change the number of exceptions that are thrown. However, it does significantly decrease the ability of applications to handle those exceptions.

Applications that use IKVM library are known to be affected by this issue if they probe for assemblies. Probing for assemblies is known to cause exceptions.

Fix System.Diagnostics.StackFrame performance degrade issue

To resolve this issue, Microsoft recommends using either of the following methods.

1] Use a different constructor for StackFrame that takes a Boolean argument

This is the preferred solution.

If application developers are able to make changes to their applications, call the System.Diagnostics.StackTrace.#ctor(Boolean) constructor by using a false argument to avoid capturing source information. This avoids the section of the code in which performance is decreased.

2]  Rollback or upgrade to the latest Windows 10 version

In this method, roll back to the previous version/build or upgrade to the latest version/build of Windows 10 if you’re experiencing this issue and you’re not currently running the latest version of Windows 10. Also uninstall .NET Framework 4.7.1 if present, from your computer and then download and install a previous version or the latest version of .NET Framework.

Hope this helps!

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