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

Question

Please can someone could explain why I get this error and what to do to fix it  or what I m doing wrong    The steps I have taken are   Download Source code from http   www codeproject com Articles 16859 AForge-NET-open-source-framework Opening in VS2010 shows the references cannot be found  Re-Add all 3 references from PlayingCardRecognition bin Release so no further warnings   When I try and build or Run I get the following message

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The project you ve downloaded is a class library  not an executable assembly  This means you need to import that library into your own project instead of trying to run it directly

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Set your api project to a startup project  Right click the api Project than choose Set as startup Project

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Your project type is a class library one would suspect  add  a ConsoleApplication or WindowsApplication and use that as your startup object  Reference this project and then access the code

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Just needs to go      Solution Explorer-- Go to Properties --- change Single Startup project  from dll to  web   Then try to debug it    Surely your problem will be solved

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To fix this issue  do these steps   Right click the Project name in Solution Explorer of Visual Studio   Select Set as StartUp Project from the menu   Re-run your project It should work

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This was the solution that worked for me since I couldn t find  Common Properties  option    Select your topmost level project in Solution Explorer  Go to Project  and in contextual menu Set as StartUp Project      See also  A project with an Output type of Class Library cannot be started directly

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To fix this issue  do these steps    Right click the Project name in Solution Explorer of Visual Studio Select Set as StartUp Project from the menu  Re-run your project It should work    If it did not work  be sure that you have set your start page  If your project is C  Windows Application or C  Console Application  try this    Right click the Project name in Solution Explorer of Visual Studio Select Properties  Select the Application tab  In the Output Type drop box Select the correct application type of your project  Re-run your project and let me know if it won   t work

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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  Set as start up project   option     Saikat Banik

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If you convert the WPF application to Class library for get the projects  dll file After that convert the same project to the WPF application you get the following error   Error   exe does not contain a static main method suitable for an entry point    Steps to troubleshoot  1 Include the App xaml file in the respective project  2 Right Click on App xaml file change the build action to Application Definition 3 Now Build your project

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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

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The project you downloaded is a class library  Which can t be started   Add a new project which can be started  console app  win forms  what ever you want  and add a reference to the class library project to be able to  play with it    And set this new project as  Startup project

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The strange part is that I don t see a main function anywhere       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

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Goto the Solution properties -  on Build right side you see the startup project type  here you need to select the console appication windows appication

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If you got this issue  got it in Visual Studio 2017 RC   and you don t get any of the things listed by Mak post from step 3 onward  4 In the Output Type drop box       it is because you made a Class Library app when you want to create a cross platform app  so here is the solution    1 Start a new project  2 select Visual C  and cross-platform app   3 select cross-platform app  Xamarin and native app   4 select blank form   From then   right click  select as startup project and build as mentioned by Mak  and it should work   If you can afford to start from scratch  it could do the trick as it did for me   This could do the trick for the main issue as well  but must be adapted to your current version of Visual Studio   Xamarin forms portable  for visual studio 2015 for example    Bye

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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

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The project type set as the Start-up project in that solution is of type ClassLibrary  DUe to that  the output is a dll not an executable and so  you cannot start it   If this is an error then you can do this   A quick and dirty fix for this  if that is the only csproj in the solution is to open the  csproj file in a text editor and change the value of the node  lt ProjectGuid gt  to the Guid corresponding to a WinForms C  project   That you may obtain from a google search or by creating a new project and opening the  csproj file generated by Visual Studio to find out what the GUID for that type is    Enjoy - not many people know about this sneaky trick   BUT  the project might be a class library rightfully and then you should reference it in another project and use it that way

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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  Start external program  and using the following path      C  Program Files  x86  Microsoft Visual Studio 12 0 Common7 IDE devenv exe   This option was set to  Start project  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

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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     Sarath F1

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The project is a class library  It cannot be run or debugged without an executable project  F5 doesn t work      You can only build the project  Ctrl Shift B     If you want to debug the code add a console application project  set it as the start up project  to the solution and add the reference to the library

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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    If still not working after the above steps  then try this       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    Then save  ctrl   S   Try debugging  F5

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VS - gt  Debug - gt  Attach unity debugger - gt  double click project

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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

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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

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

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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

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Exe s and  dll s are both assemblies   The key difference is that executeables define an entry point Main which can be invoked by the runtime   The error   Class library cannot be started directly   is due to the fact that said  dll s do not have a Main   To fix this issue  change the project type to a Windows application Console application and define an entry point   Or  add a new project that is of type Windows application Console application and reference said  dll

[c#] A project with an Output Type of Class Library cannot be started directly

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