blocks|key|429945|text|重启VS并尝试调试。有时候它会发生，甚至我也有同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|429946|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Restart VS and try to debug. Some time it happens, even I also had the same problem.

blocks|key|430018|text|首先，在项目属性和Debug选项卡中，确保将Start+Action设置为Start+Project，而不是其他不会运行的选项。如果这还不能解决问题，那么：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|430019|转到Tools+->+Options+->+Environment+->+Keyboard并在Show+commands+containing:中键入Debug.Start，并确保将Shortcuts+for+selected+command:设置为F5+(Global)。还要确保您没有任何其他映射到F5的内容可能会发生冲突。|430020|最后，如果这不能解决您的问题，那么我建议您将当前的环境设置导出为备份，然后完全重置所有环境设置。看看这是否能解决问题，如果不能解决问题，则重新导入旧设置，然后尝试修复visual+studio。|430021|entityMap^0|9|5|M|C|11|D|0|2|17|1B|P|23|B|2J|V|3H|B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|13|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|K|$]]

First, in your project properties and in the <code>Debug</code> tab, make sure that your <code>Start Action</code> is set to <code>Start Project</code> and not some other option that won't run. If that doesn't resolve it then:

Go to <code>Tools -&gt; Options -&gt; Environment -&gt; Keyboard</code> and in <code>Show commands containing:</code> type <code>Debug.Start</code> and make sure that <code>Shortcuts for selected command:</code> is set to <code>F5 (Global)</code>. Also make sure you do not have anything else mapped to F5 that might conflict.

Finally if this doesn't resolve your issue, then I suggest that you export your current environment settings as a backup, and then reset all environment settings completely. See if that resolves it, if it does not then reimport your old settings and try repairing visual studio.

blocks|key|644664|text|最后，我创建了其他项目，并将现有的文件和文件夹复制到其中。也许“不专业”，但它是有效的:)幸运的是，这是一个小项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644665|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I finally created other project and copied existing files and folders to it. Maybe 'unprofessional' but it's working :) Fortunately this is small project

blocks|key|430131|text|我也遇到了同样的问题，直到我取消选中项目属性中调试选项卡下的“启用Visual+Studio托管进程”，所有的技巧才能实现|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430132|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same problem and all the tricks didnt do it until I unchecked the "Enable the Visual Studio hosting process" under the debug tab in the project properties

blocks|key|644777|text|我也遇到了同样的问题。我不能显示调试窗口，但我可以通过选中调试->选项和设置中的相应选项，将调试输出重定向到简化的“即时窗口”；只在代码中显示显式的调试写入，如Debug.Writeline()。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644778|Visual+Studio+2010|644779|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I'm experiencing the same problem. I haven't been able to display the debug window, but I was able to redirect the debug output to the simplified 'immediate window' by checking the corresponding option in Debug->Options and Settings; only shows explicit Debug writes in the code like Debug.Writeline().

Visual Studio 2010

blocks|key|644838|text|很抱歉提出了一个老问题，但我今天遇到了同样的问题，但原因实际上是因为解决方案的构建顺序。如果您进入Solution+Property+Pages+->+Common+Properties+->+Startup+Project。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|644839|确保选择了Multiple+startup+projects，将web项目移到列表的顶部。|644840|在我的web应用程序解决方案中，我有2个web项目和5个代码项目，其中一个代码项目在顶部，因此无法启动调试。|644841|希望其他人能从中获得帮助|644842|entityMap^0|1D|N|24|H|2P|F|0|5|P|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|X|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|Y|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|M|$]]

Sorry to bring up an old question but I had the same problem today, but the reason was actually because of the build order of the solution.
If you go into the <code>Solution Property Pages</code> -> <code>Common Properties</code> -> <code>Startup Project</code>. 
The ensuring <code>Multiple startup projects</code> is selected, move the web project to the top of the list. 

In my web application solution I have 2 web projects and 5 code projects, one of my code projects was at the top, and as such debug would not start.

Hope others find this helpful

blocks|key|644900|text|我有一个非常有趣的解决方案，但它对我很管用，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644901|按住F5键直到你看到调试开始，我是认真的。|644902|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I have very funny solution, but it worked for me,

Hold the F5 key until you see that the debugging started, I'm serious guys.

blocks|key|644980|text|关闭项目，然后删除project+\bin\+debug+\文件夹中的所有文件以创建新的调试解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|644981|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

close your project then delete all files on yourproject\bin\Debug\ folder to make new debug solution

blocks|key|645080|text|转到“解决方案资源管理器”，右键单击您的项目，转到“属性”，单击“调试”，在底部有一个复选框，单击复选框以启用SQL+Server调试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645081|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Go to Solution Explorer, right-click your project go to properties, click Debug, at the bottom there is a check box, click the check box to Enable SQL Server Debugging.

blocks|key|430508|text|验证项目->属性->调试选项卡->启动操作部分中的“不启动，但在启动时调试我的代码”未被选中。不知何故，这在我创建并一直在我的项目上工作的几个月后得到了检查。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430509|取消选中此选项解决了我的问题。|430510|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Verify that in your Project -> Properties -> Debug tab -> Start Action sections that "Do not launch, but debug my code when it starts" is not checked. Somehow this got checked months after I created and had been working on my project.

Unchecking this solved my problem.

blocks|key|645200|text|我也有同样的问题，在查看bresleveloper的答案时，我发现了以下问题，似乎对我有效。张贴这篇文章，以防其他人也有同样的问题，然后他们也可以检查这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645201|转到调试选项卡<项目属性。发现调试选项已完全禁用。选中“启用调试”复选框。如果是我的话..|645202|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had the same issue and while looking at bresleveloper's answer, I found the following issue which seemed to work for me. Posting this in case anyone else has the same issue, then they can check this as well.

Went to Debug Tab &lt; Project Properties. Found that Debugging options were totally disabled. Checked the "Enable Debugging" check box. That did if for me..

blocks|key|430614|text|我的桌面应用程序也遇到了同样的问题，正如this+forum所说的，您应该将项目标记为启动项目，因为visual+studio已取消标记。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|430615|它对我来说工作得很好，我相信它会帮助其他可能有这个问题的人。|430616|entityMap|0|LINK|mutability|MUTABLE|url|https://forums.xamarin.com/discussion/19/debugger-wont-launch-anymore-in-visual-studio-2012^0|K|A|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I had the same problem with my desktop application and as <a href="https://forums.xamarin.com/discussion/19/debugger-wont-launch-anymore-in-visual-studio-2012" rel="nofollow">this forum</a> says you should mark your project as a startup project, since visual studio has unmarked. 

It worked just fine for me and I believe it will help other people that may have this problem.

blocks|key|430646|text|检查配置管理器，确保所有项目都针对同一平台进行编译。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430647|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Check Configuration Manager, make sure all projects are compiling for the same platform.

blocks|key|430677|text|关于上面的问题，控制台没有出现。(我没有足够的优点直接对这篇文章发表评论。)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|430678|我禁用了托管进程，以避免它继续运行和文件锁定的问题。当我这样做时，我发现当我点击F5进行调试时，我的控制台窗口不再出现，尽管我的程序运行得很好。然后我注意到我选中了“首选32位”复选框。我取消勾选，重新构建，控制台窗口再次出现。这似乎很奇怪，所以我再次勾选了它，并确认我可以重现这种行为。我正在使用Visual+Studio+2013。|430679|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

With regard to the problem above where the Console doesn't appear. (I don't have enough merit points to comment directly against that post.)

I disabled the hosting process in order to get around the problem of it being left running and leaving the files locked. When I did this I found my Console window no longer appeared when I hit F5 to debug, although my program ran fine. 
I then noticed that I had the "Prefer 32-bit" check-box ticked. I unticked this, rebuilt and the Console window appeared once more. This seemed strange so I ticked it off again and confirmed I can reproduce this behaviour.
I'm using Visual Studio 2013.

blocks|key|645347|text|用于新的ASP.Net核心1应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645348|在包管理控制台下，我运行|645349|dnvm+upgrade
dnvm+restore|code-block|syntax|javascript|645350|我的解决方案可以编译。|645351|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For the new ASP.Net Core 1 app.

Under package management console, i ran

<pre><code>dnvm upgrade
dnvm restore
</code></pre>

and my solution could compile.

blocks|key|645408|text|根据我使用Visual+Studio+2015的经验，我尝试删除所有进程并重新启动它不起作用。我尝试删除bin目录，但不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645409|不幸的是，唯一起作用的是关闭并在管理模式下重新启动Visual+Studio+2015。叹息..。|645410|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

My experience with Visual Studio 2015, I tried deleting all processes and restarting it didn't work. I tried deleting the bin directory, it didn't work. 

Sadly, the only thing that worked was closing down and restarting Visual Studio 2015 in Admin mode. Sigh...

blocks|key|645467|text|同样的错误，尝试以管理员身份执行VS，但它工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645468|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Same error, tried executing VS as Administrator and it worked.

blocks|key|645559|text|我遇到了同样的问题(显然是几年后)，我可以在VS+2015中看到我的设备，但当我想在设备上调试时，什么也没有发生。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645560|这可能是一个与原始海报不同的问题，但这个解决方案在VS+2015中为我解决了这个问题。|645561|右击解决方案并选择Properties，然后注意Deploy列中您的解决方案的复选框是否已选中，如果未选中，则选中它并再次尝试调试。对我很管用。|645562|​|645563|📷|atomic|offset|length|645564|645565|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/23bbb52e45f3310cf093b8b1cf6fc6bc.jpeg|imageAlt^0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@$K|11|L|12|1|13]]|A|$]]|$1|M|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

I was having the same issue (apparently several years later) where I could see my device in VS 2015, but when I wanted to debug on the device, nothing happened.

It may be a different issue than the one the original poster had, but this solution fixed the problem for me in VS 2015.

Right-click the solution and select Properties, and then notice if the checkbox for your solution in the Deploy column is checked, if it is not, then check it and try debugging again. Worked for me.

<a href="https://i.stack.imgur.com/nyeFI.jpg" rel="nofollow"><img src="https://i.stack.imgur.com/nyeFI.jpg" alt="enter image description here"></a>

blocks|key|431389|text|我在一个WPF应用程序中遇到了这个问题。运行调试器时，名为MyApp.VsHost.exe的进程将在后台启动并继续运行，但不会引发任何异常，并且“输出”窗口中除生成信息外什么也不会抛出。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431390|这是因为我更改了App类的名称空间，但没有更新App.xaml中的Class属性以匹配新的名称空间。我更改了xaml文件中的名称空间，它再次工作。|offset|length|style|CODE|431391|entityMap^0|0|8|3|N|8|X|5|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|I|$]]

I had this problem in a WPF application I was working on. When running the debugger, a process named MyApp.VsHost.exe would start and continue running in the background, but there would be no exceptions thrown and nothing in the Output window except build information.

It was because I had changed the namespace of my <code>App</code> class but did not update the <code>Class</code> attribute in <code>App.xaml</code> to match the new namespace. I changed the namespace in the xaml file and it worked again.

blocks|key|645782|text|如果您正在使用SSIS包或其中包含多个应用程序的解决方案。确保您有正确的应用程序集作为您的“启动项目”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645783|​|645784|📷|atomic|offset|length|645785|645786|如果您在同一文件夹中有一个单独的应用程序或SSIS项目，则您的Visual+Studio可能正在构建该项目，而不是您要运行的项目。|645787|希望这能有所帮助！|645788|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5b3e6040af44e7a5128c7e27e83cc527.png|imageAlt^0|0|0|0|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@$G|Z|H|10|1|11]]|A|$]]|$1|I|3|C|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U|V|-4]]]]

If you are working with an SSIS package or a solution with more than one application inside of it. Make sure you have the correct application set as your "Start up project".

<a href="https://i.stack.imgur.com/Wybv5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Wybv5.png" alt="Start Up Project View"></a>

If you have a separate application or SSIS project in the same folder, your Visual Studio is probably building that instead of what you want to run.

Hope this helps!

blocks|key|431582|text|对我来说起作用的是完全删除解决方案文件夹(必须重启Windows才能这样做)，然后从源代码管理中恢复它。这听起来很极端--但实际上并不需要很长时间。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|431583|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

What worked for me was completely deleting the solution folder (had to reboot Windows to be allowed to do this), and then getting it back from source control. Sounds drastic - but it doesn't actually take very long.

blocks|key|645912|text|使用Visual+Studio+2017。在一个解决方案中有十几个项目。按debug将不会出现任何错误，然后什么也不做。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|645913|问题是一个项目是在.Net+4.6上构建的，而其余的项目是在.Net+4.0上构建的|645914|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Using Visual Studio 2017. Had dozen projects in a solution. Pressing debug would build with no error then do nothing. 
Issue was one Project built to .Net 4.6 while the rest where .Net 4.0

When I hit F5 (debugging mode) nothing happens. Building works correctly, exe file I can launch properly, but can't start debug. Why?

Debugging doesn't start

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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当我点击F5 (调试模式)时，什么也没有发生。构建工作正常，exe文件我可以正常启动，但不能启动调试。为什么？

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