Visual Studio / IIS Express间歇性错误

Question

I've been having problems with IIS Express for the past few years since we stopped using regular IIS in our projects. We typically have solutions that have a web service and some kind of client(web, desktop, or both). When I run the client about 1 in every 10 times, I will get an error about not finding localhost:blahblah or not being able to load an assembly. A full rebuild always fixes this problem. HOWEVER, this is something that I have dealt with in VS2013 and VS2015 along with my coworkers. I have come up with a workaround where I added a Pre-build event to delete the bin folder of the web service and do and msbuild on it. This works great on my machine. However, I don't know a way to write it where it works on our build server or on other peoples machines. The Pre-build events get checked into source control as part of the cs.proj file so I need a generic solution if I go that route. Here is my Pre-build script:

DEL /Q "C:\TFS\Enterprise Data Management\Vendor\Dev-Phase2US\WcfService\bin\*.*"
"C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe" "C:\TFS\Enterprise Data Management\Vendor\Dev-Phase2US\WcfService\WcfService.csproj"

Has anyone else had similar problems? Any good solutions or workarounds?

Answer 1

In answer to the question being asked, to use "generic" paths, use the "Macros" offered in Visual Studio (technically, MSBuild Properties). Assuming the WcfService folder is in the same solution,

DEL /Q "$(SolutionDir)\WcfService\bin\*.*"

Or if it's in some path relative to the project,

DEL /Q "$(ProjectDir)..\..\..\WcfService\bin\*.*"

Note that using Pre-Build events for this is pretty bad practice though. It's better to use the Clean task in the project, eg by adding this to your .csproj (under the root element, eg before </Project> ):

  <Target Name="CleanWcfProject" BeforeTargets="PrepareForBuild">
    <MSBuild Projects="$(SolutionDir)\WcfService\WcfService.csproj" Targets="Clean" Properties="Configuration=$(Configuration);Platform=$(Platform)" />
  </Target>

I'm not sure why you're running MSBuild on the WcfService.csproj project either, since you could simply add it as a project reference (right-click > Add Reference > Solution), which would cause MSBuild to automatically build the project upon seeing that its outputs are cleared.

If your dependent project is in another Solution

If this is the case, then the Clean should work with a relative path, but adding a ProjectReference may not be desirable/possible (you can still add the dependency to your solution, even if it's in another solution, but often this isn't possible/feasible because of lots of other dependencies).

If so, then simply add the build target as well,

  <Target Name="CleanWcfProject" BeforeTargets="PrepareForBuild">
    <MSBuild Projects="$(ProjectDir)..\..\..\WcfService\WcfService.csproj" Targets="Clean;Build" Properties="Configuration=$(Configuration);Platform=$(Platform)" />

  </Target>

Answer 2

Many thanks to Al-Muhandis for getting me on the right track for this. In summary, a Rebuild of the WCF Service project fixes my problem 100% of the time. The pre-build event in my initial question was a very hacky way of doing this. A simple Clean isn't enough as I get this error with just a Clean:

The requested service, ' http://localhost:53934/EdmVendService/EdmVendor.svc ' could not be activated. See the server's diagnostic trace logs for more information.

My final solution was to add this block of XML to the csproj file. I just used notepad to edit it.

<Target Name="RebuildWcfProject" BeforeTargets="PrepareForBuild">
  <MSBuild Projects="$(SolutionDir)\WcfService\WcfService.csproj" Targets="Rebuild" Properties="Configuration=$(Configuration);Platform=$(Platform)" />
</Target>

Here is the bottom of the csproj file after my change.

Hope this may be of help to someone else.

Answer 3

Can you try this alternative settings for your project. Right Click on your web project. Select Properties and then Select the Web tab. Configure your Visual Studio as below.

Also Right Click on the Project and Select Set as Start Up Project as below

Then lastly Right Click on the home page, eg or the page you wish to start up first eg index.html, and Set As Start Page as below

Answer 4

If you have both console app and web app in the same solution, please try this, right on solution. Select properties and set the Start up Projects to Multiple startup projects as below