抑制第一次机会例外

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，但是在我得到有趣的代码之前，我需要经历每个调试会话约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，我关闭第一次机会异常，然后手动把它们打开，但这是一个麻烦和时间沉淀。

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.

从MSDN链接引用（重点是我的）：

Quote from MSDN link (emphasis added is mine):

与此属性相关联的调试除外，没有运行时行为。

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

但是，如果您只有一种方法用于包含在Visual Studio的第一次机会异常处理机制中的某些行，以及要排除的其他行，则可能没有解决方案这个级别的粒度。您可以随时将大型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.

其他信息...

的使用示例

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;
    }
}

显示可能有用的相关VS项目选项。

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

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