blocks|key|3245086|text|您需要一些使用类库的应用程序(控制台应用程序是我最喜欢的调试应用程序，但WinForm也可以)。只需添加控制台应用程序或Windows窗体应用程序的新项目(在同一解决方案中)，并添加对当前项目的引用。一旦你完成了这项工作，就可以打电话给你需要的人，设置你的中断点，然后进城去。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3245087|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|$]]

You'll need some kind of app (Console Apps are my favorite for debugging, but a WinForm will do) which uses your Class Library. Just add a new project (in the same solution) of a Console Application or Windows Forms Application, and add a reference to your current project. Once you've done that, make any calls you need, set your break points, and go to town.

blocks|key|301333|text|奇怪的是，我在任何地方都没有看到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|301334|函数。|blockquote|301335|301336|这正是你的问题所在。该项目仅创建了一个DLL。它没有要运行的可执行文件。|301337|您将需要添加第二个项目，该项目是一个可执行文件，它引用另一个项目并调用其中的内容。|301338|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|M|8|@]|9|@]|A|$]]|$1|E|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

<blockquote>
 <blockquote>
 The strange part is that I don't see a main function anywhere.
 </blockquote>
</blockquote>

That is exactly your problem. The project merely creates a DLL. It has no executable to run.

You will need to add a second project, which is an executable which references the other project, and calls something in it.

blocks|key|3031010|text|下载的项目将编译为dll程序集，并提供一组具有已实现功能的类。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3031011|您应该向您的解决方案添加一个输出类型为Console+Application或Windows+Application的新项目(VS+add+project向导将为您提供不同的项目模板)。|3031012|在新添加的项目中，您可以实现逻辑来测试类库。|3031013|您可以通过以下步骤找到并更改工程的输出类型：|3031014|3031015|在解决方案资源管理器->属性中右键单击项目。|ordered-list-item|3031016|在打开的带有属性的选项卡中选择应用程序，此时将出现标有输出类型标签的ComboBox。|3031017|3031018|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|V|8|@]|9|@]|A|$]]|$1|L|3|M|5|K|7|W|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

The project you have downloaded compiles into a dll assembly and provide a set of classes with implemented functionality.

You should add to your solution a new project with Output Type of either Console Application or Windows Application (VS Add Project wizard will offer you different templates of Projects).

In the newly added project, you can implement logic to test your Class Library.

Output type of the project you can find and change by the following steps:

<ol>
<li>Right click on project in Solution Explorer -> Properties.</li>
<li>In opened tab with properties select Application and there will be ComboBox marked with Output Type label.</li>
</ol>

blocks|key|3031054|text|只需右键单击项目解决方案，就会弹出一个窗口。展开公共属性。选择启动项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3031055|在那里，在右侧选择单选按钮与单一启动项目，选择您的项目在那里，并应用。|3031056|就这样。现在保存并构建您的项目。运行该项目以查看输出。|3031057|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Just right click on the Project Solution 
A window pops up.
Expand the common Properties.
Select Start Up Project

In there on right hand side Select radio button with Single Startup Project
Select your Project in there and apply.

That's it. Now save and build your project. Run the project to see the output.

blocks|key|3031080|text|只需要去：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3031081|3031082|解决方案资源管理器-->转到属性->将(单启动项目)+from.dll更改为.web|blockquote|3031083|3031084|3031085|然后试着调试它。|3031086|你的问题肯定会解决的。|3031087|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|P|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|S|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|M|$]]

Just needs to go:

<blockquote>
 Solution Explorer-->Go to Properties --->change(Single Startup project) from.dll to .web
</blockquote>

Then try to debug it. 

Surely your problem will be solved.

blocks|key|301410|text|这是对我有效的解决方案，因为我找不到“通用属性”选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|301411|301412|在解决方案资源管理器中选择顶层项目。|ordered-list-item|301413|转到项目，并在上下文菜单中设置为StartUp项目。|301414|301415|📷|atomic|offset|length|301416|​|301417|另请参阅：A+project+with+an+Output+type+of+Class+Library+cannot+be+started+directly|301418|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/52370cd5fbe72387706d1796a0f6b815.png|imageAlt|1|LINK|MUTABLE|url|https://stackoverflow.com/q/11152272^0|0|0|0|0|0|0|1|0|0|0|5|21|1|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|17|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|18|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|1A|8|@]|9|@$L|1B|M|1C|1|1D]]|A|$]]|$1|N|3|O|5|6|7|1E|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1F|8|@]|9|@$L|1G|M|1H|1|1I]]|A|$]]|$1|R|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]|10|$5|11|V|12|A|$13|14]]]]

This was the solution that worked for me since I couldn't find 'Common Properties' option.

<ol>
<li>Select your topmost level project in Solution Explorer.</li>
<li>Go to Project, and in contextual menu Set as StartUp Project.

<a href="https://i.stack.imgur.com/IuhpD.png" rel="noreferrer"><img src="https://i.stack.imgur.com/IuhpD.png" alt="Set as StartUp Project"></a></li>
</ol>

See also: <a href="https://stackoverflow.com/q/11152272">A project with an Output type of Class Library cannot be started directly</a>

blocks|key|3245331|text|在尝试使用Visual+Studio+2013的实验实例时，我遇到了类似的问题。这是一个vsix项目(创建代码片段)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3245332|解决方案是：|3245333|在解决方案资源管理器中右键单击项目>属性>调试|offset|length|style|BOLD|3245334|将启动操作设置为"Start+external+program"，并使用以下路径：|CODE|3245335|Microsoft：\Program+Files+(X86)\+|3245336|+12.0\Common7\IDE\devenv.exe|blockquote|3245337|3245338|3245339|此选项被设置为"Start+project"，这将不适用于应用程序输出类型类库，这会导致相同的错误。|3245340|注意:根据您安装VS的方式不同，您的VS可能会有所不同。|3245341|entityMap^0|0|0|0|H|I|2|L|2|0|8|O|0|0|0|0|0|7|F|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|11|8|@$F|12|G|13|H|I]|$F|14|G|15|H|I]|$F|16|G|17|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|18|8|@$F|19|G|1A|H|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|1B|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|1C|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1F|8|@$F|1G|G|1H|H|L]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1I|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]]|Y|$]]

I had a similar issue when trying to use the Experimental Instance of Visual Studio 2013. This was for a vsix project (Creating Snippets).

Solution was:

Right Click Project in Solution Explorer > Properties > Debug

Setting the Start Action to <code>"Start external program"</code> and using the following path:

<blockquote>
 C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe
</blockquote>

This option was set to <code>"Start project"</code> which won't work for the application output type Class Library, which caused that same error.

Note: Yours may differ depending on how you installed VS.

blocks|key|299155|text|1)+Right+Click+on+**Solution+Explorer**
2)+Go+to+the+**Properties**+
3)+Expand+**Common+Properties**
4)+Select+**Start+Up+Project**
5)+click+the+radio+button+(**Single+Start_up+Project**)
6)+select+your+Project+name+
7)+Then+Debug+Your+project|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|299156|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>1) Right Click on **Solution Explorer**
2) Go to the **Properties** 
3) Expand **Common Properties**
4) Select **Start Up Project**
5) click the radio button (**Single Start_up Project**)
6) select your Project name 
7) Then Debug Your project
</code></pre>

blocks|key|301462|text|假设您在解决方案中有多个项目。选择要在浏览器中查看的项目，然后选择'Set+as+StartUp+Project'。在作为主项目的多项目解决方案中，visual+studio无法识别。这是主要的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|301463|entityMap^0|A|4|Q|2|X|O|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Suppose you have multiple project in the solution. Select the project that you want to view in browser and select 'Set as StartUp Project'. In your multiple project soln which was the main, the visual studio was unable to identify. this was the main problem.

blocks|key|299194|text|错误解决方案是，您已经打开了项目，但错误地选择了另一个类库。这就是这个错误显示的原因...所以你需要做什么你只需要选择你的项目然后右键点击你的项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|299195|右键单击后，您可以看到列表框并选择"Set+as+start+up+project“选项。|offset|length|style|BOLD|299196|entityMap^0|0|I|N|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]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Error solutions is that you have already open your project but by mistake you have selected another class library .. that's reason this error is showing ... so what u need to do you u just select u r project then right click on u r project
after right click u can see the list box and select the &quot;Set as start up project &quot; option .

blocks|key|3031335|text|++++Right+Click+on+"Solution+Explorer"+->+"Properties"
++++Expand+"Common+Properties"
++++Select+"Start+Up+Project"
++++click+the+radio+button+"Single+Start_up+Project"
++++select+your+Project+name+from+the+drop+down+list.|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3031336|如果在执行完上述步骤后，仍然不能使用，那么可以试试这个。|unstyled|offset|length|style|BOLD|3031337|++++Expand+solutions+explorer.
++++Right+click+on+project+name+->+"Properties"
++++Go+to+"Application"+tab
++++Select+"Output+type"+
+From+the+drop+down+list+select+the+appropriate+type+according+to+your+application.
++++"Windows+application"+or
++++"Console+application"|3031338|然后保存(ctrl+%2B+S)|3031339|尝试调试(F5)|3031340|entityMap^0|0|C|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@$G|U|H|V|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code> Right Click on "Solution Explorer" -&gt; "Properties"
 Expand "Common Properties"
 Select "Start Up Project"
 click the radio button "Single Start_up Project"
 select your Project name from the drop down list.
</code></pre>

If still not working after the above steps, then try this.

<pre><code> Expand solutions explorer.
 Right click on project name -&gt; "Properties"
 Go to "Application" tab
 Select "Output type" 
 From the drop down list select the appropriate type according to your application.
 "Windows application" or
 "Console application"
</code></pre>

Then save (ctrl + S)

Try debugging (F5)

blocks|key|302237|text|您可以右键单击Class+Library项目，然后从下拉列表中选择Initialize+Interactive+C#，这将加载您的项目上下文，您可以在交互式会话中使用它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302238|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|$]]

You can right click the Class Library project and from the drop-down choose Initialize Interactive C# which will load your project context and you can work it in the interactive session.

blocks|key|3031370|text|在我的例子中，原因是我在解决方案中的一个项目没有加载。无法正确加载的原因是其中一个文件的文件路径长度太长。删除这个长文件后，我可以重新加载项目，并构建解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3031371|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|$]]

In my case, the cause was that one of my projects in the solution wasn't loaded. The reason it couldn't load properly was that the file path length of one of the files was too long. Upon deleting this long file, I could reload the project, and build the solution.

I downloaded a C# project and I wish to debug the project to see how an algorithm implementation works.

The project has come in a Folder, inside this folder there are -

<ol>
<li><code>.sln</code> file and </li>
<li>a folder which has source files and a <code>.csproj</code> file.</li>
</ol>

I installed Visual Studio and opened the <code>.sln</code> file present in the main folder. I built the project successfully, but when I try to debug the project I get this message:

<blockquote>
 A project with an Output type of Class Library cannot be started directly In order to debug this project, add an executable project to this solution which references the library project. Set the executable project as the startup project.
</blockquote>

The strange part is that I don't see a main function anywhere.

What should I do to get round this hiccup?

"A project with an Output type of Class Library cannot be started directly"

Visual Studio

Windows

我下载了一个C#项目，我希望对该项目进行调试，看看算法实现是如何工作的。该项目位于一个文件夹中，在该文件夹中有-包含源文件和.sln .csproj file.的文件和文件夹我安装了Visual Studio并打开了主文件夹中的.sln文件。我成功地构建了这个项目，但当我尝试调试该项目时，我得到了这样的消息：无法直接启...

问“输出类型为类库的项目不能直接启动”
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