抑制第一次机会异常

问题描述

是否可以在 Visual Studio(C# 调试器)中抑制特定代码行的第一次机会抑制?

Is it possible to suppress first chance supressions in Visual Studio (C# debugger) for specific lines of code?

我想在调试器中使用第一次机会异常，但是在我获得有趣的代码之前，我需要通过每个调试会话大约 50 个第一次机会异常.

I want to use first chance exceptions in the debugger, but there are about 50 first chance exceptions I need to go through every debug session before I get to the interesting code.

目前，我关闭了第一次机会异常，然后手动打开它们，但这既麻烦又浪费时间.

Currently, I turn off first chance exceptions and then manually turn them on, but that's a hassle and a time sink.

推荐答案

DebuggerNonUserCodeAttribute Class

从 .NET 2.0 开始，如果您使用 [DebuggerNonUserCode] 属性，调试器将跳过其中的第一次机会异常.

DebuggerNonUserCodeAttribute Class

As of .NET 2.0, if you mark an method with the [DebuggerNonUserCode] attribute, the debugger will skip first chance exceptions in it.

引用自 MSDN 链接(强调的是我的):

Quote from MSDN link (emphasis added is mine):

会员不是代码的一部分由用户专门创建可以使调试体验复杂化.该属性抑制显示这些附属类型和成员在调试器窗口并自动逐步通过，而不是进入，设计者提供的代码.

除了调试之外，没有与此属性相关的运行时行为.

There is no runtime behaviour apart from debugging, associated with this attribute.

但是，如果您只有一个方法，其中某些行旨在包含在 Visual Studio 的第一次机会异常处理机制中，而其他行要排除在外，那么在这种粒度级别上可能没有解决方案.您始终可以将一个大方法重构为多个方法，并在选定的方法上使用该属性.

However if you have just one method with certain lines intended for inclusion in Visual Studio's first chance exception handling mechanism, and other lines to be excluded, there's likely not a solution at this level of granularity. You can always refactor a large method into multiple methods and use the attribute on select ones.

附加信息...

来自这篇文章

using System.Diagnostics;
using XL = Microsoft.Office.Interop.Excel;

public static class WorkbookExtensions
{
    [DebuggerNonUserCode]
    public static bool TryGetWorksheet(this XL.Workbook wb, string worksheetName, out XL.Worksheet retrievedWorksheet)
    {
        bool exists = false;
        retrievedWorksheet = null;

        try
        {
            retrievedWorksheet = GetWorksheet(wb, worksheetName);
            exists = retrievedWorksheet != null;
        }
        catch(COMException)
        {
            exists = false;
        }

        return exists;
    }

    [DebuggerNonUserCode]
    public static XL.Worksheet GetWorksheet(this XL.Workbook wb, string worksheetName)
    {
        return wb.Worksheets.get_Item(worksheetName) as XL.Worksheet;
    }
}

文章 展示了可能有用的相关 VS 项目选项.

The article shows related VS project options that might be useful.

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