Parser Error Message: Could not load type 'som

问题:

I am experiencing an error that I am unable to resolve for some time now. I was wondering if someone can help identify the cause of this error? I am completely new to asp / asax. After some research, I think that the error I am getting is due to the web application trying to use outdated code. I was thinking to rebuild the c# file using Visual Studio and/or the entire project. However, I am completely new to C# and asp, and was wondering can give me some suggestions if this may fix the problem and/or if there is an possible alternate solution.

Error message

Parser Error Message: Could not load type 'Inventory1.Global'.

Source Error:   <%@ Application Codebehind="Global.asax.cs" Inherits="Inventory1.Global" %>

Entire Global.asax contents:

<%@ Application Codebehind="Global.asax.cs" Inherits="Inventory1.Global" %>

回答1:

Try replacing CodeBehind with CodeFile

回答2:

Could not load type

means that a type could not be loaded. (In this case, "type" refers to Inventory1.Global). Types are located in compiled DLLs. So, either the DLL isn't available, is out of date, or doesn't contain a public type with the given name.

Some possible causes are:

• You have no type declared with the given name. For your example, you should have the following:

namespace Inventory1 {
  public class Global {
  ...
  }
}

Note: avoid names like Inventory1. They imply that there is an Inventory2, Inventory3, etc., which is bad practice as they're abmiguous and not very descriptive. Also, Global is pretty vague, and may introduce confusion with the global namespace.

• Make sure your cases match (Inventory1, not INVENTORY1.)
• You haven't compiled the project. In VS, rebuild the solution.
• The assembly that declares the class has a compilation error, so the relevant DLL is either missing or out of date. Make sure you've resolved all errors.
• The class is not marked as public.

If I had to guess, I'd put my money on a compilation error. Unlike PHP and other interpreted languages, C# have to be successfully compiled before they can be used.

回答3:

I had this error , just needed to rebuild the project

回答4:

I faced this issue and i got the solution from here and i would like to share it.

SOLUTION Empty the bin folder. Build all the dependent class libraries and refer them in the main project and build the complete solution.

I did this and it worked like a charm for me !!

回答5:

Since it was only happening with IISexpress, changing output from bin\Debug\ to bin\ solved it for me. Changing tag CodeBehind to CodeFile only created even more problems.

回答6:

This happened with me on my local machine. The issue was incorrect IISExpres config. If you are getting this issue on your local environment (Visual Studio debug runs), check the IIS Express config file. Make sure your local site/application path is pointing to the correct location.

The configuration file is called applicationhost.config. It's stored here: My Documents > IIS Express > config . Usually (not always) one of these paths will work:

• %userprofile%\documents\iisexpress\config\applicationhost.config
• %userprofile%\my documents\iisexpress\config\applicationhost.config

回答7:

After scouring around for what could have caused this I found a few things that I needed to do to get my project running...

(Note: You may not need to do all of these - it is a case-by-case thing)

• If you did any changes from IIS Express to Local IIS you may need to change the build configuration from bin/debug to bin. (Right click on solution >> Properties >> Build >> Output)

• If you have a URL rewrite then you will need to install URL rewrite on your Local IIS.

• Navigate to your applicationhosts.config file (usually it's some place like C:\Users\username\Documents\IISExpress\config) and rename the file to applicationhostsOLD.config.

• Clean and rebuild your project. You may need to go manually empty out the bin.

Now you should be good to go.

回答8:

It can't find the necessary file in dll assembly. Rebuild the project, Rebuild the solution and then try it again.

回答9:

It's likely that you renamed something. Check the Global.asax.cs file for the class declaration and make sure that the namespace and class name match exactly what's in the asax file. This includes case! Can you copy/paste the namespace and class declaration of the .cs file into a post here so that we can compare?

回答10:

Parser Error Message: Could not load type __

After doing everything suggested in the comments above, with no luck, refreshing (uploading) the contents of /bin to the server worked. The files uploaded to bin are the: dll, pdb and xml. Don't know which one did it.

The problem I had here was induced by renaming a file (_.aspx) in Solution Explorer.

回答11:

Rebuilding/re-publishing my project/solution to the server did nothing to help me, and I doubt that will help that many out of this predicament. For me, I did a few things to troubleshoot this that eventually got me out of this "hole".

I had been trying to use a binding on the web site, but this wasn't working. I tried calling the site with http://localhost/Report.aspx (this was my homepage, which I opted to not call Default.aspx - I was going to update the "Default Documents" section with the name later) when I got the Parser Error the OP saw. So I tried some things:

I stopped the old project's website and built another, simple web project, that had "hello" and a label on the page and nothing else. I had a line in the Page_Load to populate the label's Text property with "world!", just to make sure that part was working. I created a new website on port 80 and transferred the published contents of my site to the server. So even though I had .NET 4.5 installed on the server (and had ran the aspnet_regiis -i command from the 4.0 directory) and the App Pool in IIS that I was using for this new project was set to 4.0, the browser complained about the web.config having a targetFramework=4.5.2 in it, which is Visual Studio 2015's default framework. So I installed .NET 4.6 (NDP46-KB3045557-x86-x64-AllOS-ENU.exe), restarted the server, and then my simple site worked. So then I deleted this site - all I wanted to do was prove my installation steps were accurate and the server could run a site.

So then I went back to my original project/site - I deleted and re-created the web site. I put the Application Pool to the one I had originally created for this, which I ensured was running .NET 4.0. Once I did this, I navigated to my site and everything worked when using http://localhost/Report.aspx. So it seems to me what causes this is what version of the .NET Framework you are using.

回答12:

I tried all the solutions listed above and none of them worked. I finally created a new web page (webform) and copy blocked all the code (cs and aspx files) into it from the old one, deleted the old cs and aspx file, recompiled, and now I'm back in business. I know it makes no sense. It should not have mattered, but it worked.

回答13:

Please try to open your project as Project/Solution, most probably it will resolve the error. This type of error Could not load type.... occurs when we try to open project as website.

I have tried to open my project as solution and it resolved my problem.

回答14:

Please check namespace and class name at all places, In one case, One team member changed namespace and I was using old namespace in .aspx file. It was causing issue. I updated namespace and it got working.

回答15:

I was fixing my namespaces in our Base Project, and I started seeing this error on another project that references it after that. I had to remove the reference to the Base Project and re-add it and then it started working again.

回答16:

I just got this error today. It turns out that it was because I reverted by mistake the project file to an older version that didn't include the page anymore.