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I am trying to make a simple CLI project with C# and wanted to make a logger for it. I settled on using Log4Net. I was using this guide to set it up. On step 3, it recommends we add
[assembly: log4net.Config.XmlConfigurator(ConfigFile = "log4net.config")]
in the AssemblyInfo.cs to tell Log4Net where to load its configuration from.
I tried to follow it and went to Visual Studio to add that to the AssemblyInfo.cs but I was unable to find it. In a screenshot shared by the writer of the guide which can be viewed here, it shows that their project has a Properties folder that contains an AssemblyInfo.cs file which mine doesn't(Screenshot:
).
I made another project to see if something was wrong with the way the CLI project was created but I still got a project without an AssemblyInfo.cs.
Googling the issue I see that I can go to the project properties page and click the assembly information button and have it regenerated but that is also missing for me in both projects.
Any idea why and how I may fix this? Or maybe a way to use Log4Net without an AssemblyInfo.cs file.
Any help is appreciated
Just add an AssemblyInfo.cs file yourself - or call it something else entirely, e.g. Log4NetAssemblyAttributes. The name of the file is irrelevant. A file with the attributes from the project file is generated automatically as part of the build in .NET Core, rather than being included as a regular source file in the project template, but you can place an [assembly:xyz] attribute in any source file you like.
When running a web application project, at seemingly random times a page may fail with a CS0433 error: type exists in multiple DLL's. The DLL's are all generated DLL's residing in the "Temporary ASP.NET Files" directory.
Add the batch="false" attribute to the "compilation" element of the web.config file.
This problem occurs because of the way in which ASP.NET 2.0 uses the application references and the folder structure of the application to compile the application. If the batch property of the element in the web.config file for the application is set to true, ASP.NET 2.0 compiles each folder in the application into a separate assembly.
http://www.sellsbrothers.com/1995
http://support.microsoft.com/kb/919284
This might happen if you place .cs files in App_Code and changed their build action to compile in a Web Application Project.
Either have the build action for the .cs files in App_Code as Content or change the name of App_Code to something else. I changed the name since intellisense won't fix .cs files marked as content.
More info at http://vishaljoshi.blogspot.se/2009/07/appcode-folder-doesnt-work-with-web.html
One possible reason for this error is that there are 2 aspx pages which are having the same name in their inherits= in the <#page language=......inherits=> line.
Changing the inherits= name solves the error.
Just in case someone else shares my problem, I got this error when trying to publish a Web Site of a newly branched project, build worked perfectly.
Turns out I had forgotten to remove the checkbox for "Allow precompiled site to be updatable" under publish Settings -> Configure precompile.
As another data point, I just had this problem without any evidence of circular references as described in the links in Ben's answer. Building my web site project would fail with a few of these errors, and setting compilation batch="false" fixed it, but I didn't want to go that route as this is a large-ish production website.
This solution was in a subfolder of my D:\svn folder, which I had mapped to S:. When I opened the solution from S:, these errors occurred, but if I went straight to D:\svn and opened the solution, no errors.
I also noticed that, despite having compilation batch="true" in my web.config, when opening the solution from the mapped S: drive all my .ascx files get compiled into their own assemblies. If I open it from the physical location, the .ascx files get compiled into their respective folders' assemblies (which is how batch="true" is supposed to work).
Strange.
This error was due to conflict between class name of web form and wsdl stub(code behind file .cs) having the same class name i.e.
ASPX page: Dashboard
Class: partiacl class Dashboard
AppCode/APIServices.cs: public partial class Dashboard
Error was reproducible only on publishing the website but build and debug did not inform any error.
In my case deleting all output assemblies from bin folders in all projects in the solution solved the issue. Unfortunately I have no explanation for it.
In my case I had renamed a project, so also the dll had been renamed. When I just copied the new dll but didn't think of deleting the old one from the server, I soon had a bunch of pairs of classes with the same names. Deleting the outdated dll's was doing the trick (of cause).
None of these answers worked for me, however I did fix the problem. Since I was using VS's Publish function to deploy the web application, I selected the option to delete all existing files prior to publish in the Publish Web wizard. This forced a clean copy of the application and everything worked fine from there.
This solution might be helpful if your local debugging copy works fine but published system isn't. Also great if you don't want to take the time to track down individual dlls to delete and don't mind the production files being deleted first.
In my case, the problem was solved when I edited a Designer.cs file that still had the duplicated class name. for some reason, when i renamed the class "logout" to "logout2", in the designer file it was not automatically changed, and was still "logout", and this class name already existed in a precompiled dll in my project (that belongs to a third party web app that I work with and develop around of).
Got this problem when put a part of an aspx page into the separate user control. On my machine everything was fine, on the server got an error.
Renamed the problem class and file.
http://support.microsoft.com/kb/919284 Method 2: Reorder the folders in the application is writing about possible circular references
None of these solutions worked for me. Both of my conflicting DLLs were in C:\...\AppData\...\Temporary ASP.NET Files\...
The problem was that I had rolled back my source repo to an earlier version - before we moved a type from one project to another project within the same solution.
I tried deleting the newer DLL - which should not have even been there at all in the older codebase - from the "Temporary ASP.NET Files" location identified by msbuild. msbuild just put it back.
I also tried the web.config setting that some here have used successfully, but that did not work either. Although, as I write this, I realize that there were actually two MVC projects within the same solution and both had errors, so the problem may have been that I did not add the setting to both.
I tried rolling my source repo forward and cleaning and rolling back again and cleaning. Nothing.
I tried deleting everything the "Temporary ASP.NET Files" location. msbuild just put it back again.
Finally, I tried rebuilding in Visual Studio. Although the command line output and the "Errors" output both gave the same msbuild "Temporary ASP.NET Files" error, the Intellisense error - when hovering over the conflicted type - actually complained about DLLs in output directories. Apparently "Clean" and "Rebuild" were not doing their jobs. I manually deleted the DLLs in the output directories identified by Intellisense, and the problem was solved.
tl;dr - Make sure you're covering all of your web.configs with the batch setting, and try to leverage Intellisense for further clues.
My problem was linked to a .dll that was getting generated in my project folder.
If you are referencing another file, instead of doing everything you see above, what fixed my problem instantly was just deleting the .dll that was staying inside my /bin directory for my project.
The problem isn't necessarily a web.config fix - it's a circular reference that needs to get resolved. I realized that I cleared the old .dll in my original project file but not in the project that was referencing it.
I don't recommend making the modification to your web.config file because that's just a band-aid fix - not really addressing the actual problem. Do that if you don't feel like fixing the problem, but if you want to avoid future headaches, just remove the .dll from both places.
I had a partial class with the same name in two different projects.
I solved it by only leaving it in one project.
None of this solutions worked for me. Compiling in "Release" mode worked, but when I switched to "Debug" I got umpteen of this error Messages.
I don't understand why, but a simple restart of Visual Studio was my solution.
Sometimes it may help to remove the solution and create it again.
Since this use to happen when converted from VS2005 to vs2010 some references to framework 4.0 (after upgrading ) remains in the solution, even all projects are defined as 3.5.
Normally rebuilding the solution should clear these problems.
I had the same problem when I was compiling the application on a compiling server.
My controller had a simple static code, so I changed my ascx:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="controllerName.ascx.cs" Inherits="Controls.controllerName" %>
To
<%# Control Language="C#" AutoEventWireup="true" Src="controllerName.ascx.cs" Inherits="Controls.controllerName" %>
Also removed the partial keyword from the codebehind and added a namespace to the codebehind.
This:
using System;
using System.Web.UI;
/// <summary>
/// My controller
/// </summary>
public partial class controllerName: UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
}
To this:
using System;
using System.Web.UI;
namespace Controles
{
/// <summary>
/// My controller
/// </summary>
public class controllerName : UserControl
{
protected void Page_Load(object sender, EventArgs e)
{
}
}
}
And that worked for me.
For me this happened when I had my PrecompiledWeb/Publish location set to the current directory which was where the site's root folder was too.
My Web Site was then seeing the publish folder as part of the project when compiling/building and then finding duplicates in that manner.
i.e. Don't put the published/precompiled version of your site in your site's code folders.
If the DLL's are showing in a temporary folder, you should try cleaning your solution.
Posting my solution:
The issue was related to the "On-Access Scan" of Mcafee Antivirus. Disabling this solved the problem. Somehow, the ASP Temporary folder was not being used properly by ASP when the antivirus was ON.
Hope this helps someone.
App_Code folder is causing the problem , put the class outside the folder (Works fine)
App_Code folder is not designed for Web Application Projects
http://vishaljoshi.blogspot.in/2009/07/appcode-folder-doesnt-work-with-web.html
Go to Add reference and search for both the dll,
Both of the dll would have checked, uncheck one of the dll, as there are references to the same dll with different version ambiguity gets generated.
My solution was to replace CodePage="...." with CodeBehind="..." in the .aspx file. Somehow it was left as CodePage during a migration from previous .NET versions.
This page directive creates another dll file which conflicts with the projects dll file.
I faced with the problem in compile time.
I agree with the batch="true" attributes, error is telling there exist 2 assembly
Solution 1: deleting one of them
Solution2: Configure one of them
Had a similar problem, In my case, I noticed, that cleaning a solution doesn't clear the bin folder in the visual studio. There was old compiled .dll present in the folder that is causing the issue.
Solutions:
Manually delete bin folder and recompile
In case of publish, select delete existing files prior to publish.
This will solve the issue.
You should define an alias for one of your references.
In your project file .csproj add the following item:
<ItemGroup>
<Reference Include="temp1.dll">
<Aliases>MyAssembly</Aliases>
</Reference>
</ItemGroup>
After adding the above ItemGroup, MyAssembly will represent a root namespace that will contain all namespaces in the assembly temp1.dll.
Then you can have access to the type foo, which is located in temp1.dll, as follow:
using MyAssembly.foo;
I am currently trying to add a VB file inside a C# project, but I am only able to add C# files. Is there a way for me to be able to add more language templates like what is shown below?
This picture below is an example of what I have been able to do in an old project which is to be able to add both VB and C# files into one project.
Update: I am redeveloping an ASP.NET 2.0 site to the newest version with the new bootstrap framework. I didn't realize the old project was using mostly VB until I started the redevelopment in C#. I noticed that the old project is also using some C#. I am trying to see if I can have those two languages inside a new ASP.NET project or not by adding VB files. If not, I'll just make a VB project and convert all of the C# code to it.
When you open the "Add new file" dialog inside a project, it is filtered by the current project type you're working on. E.g. you cannot add a *.vb file to a C# project type, without hacking it somehow.
The GUID within the *.csproj file defines the current project type. This site contains a set of known GUIDs, it is somewhat outdated since it's from 2008.
As I said in a comment, the reason you have been able to mix-in both VB and C# code within the web project, is by using CodeFile attribute, rather than the CodeBehind attribute. The latter will compile all the source files within the project into an assembly with the same name. This will be the file you are uplading to your webserver along with the .aspx files.
Sample file structure:
bin/MyApp.MyProject.dll
Index.aspx
The CodeFile variant, which compiles the source on the fly will need all the files in the same directory, or in the directory specified within the attribute, for this example it will reside within the same directory. This will also allow you to change the code at the web server, and not having to download the code to your development environment. (This is NOT recommended, as you wave goodbye to any version control and other useful tools.)
Sample file structure:
Index.aspx
Index.aspx.cs
My advice would be to decide whether or not to continue developing in VB, or switch to C#. Containing your codebase to one language is preferrable. And if you decide to refactor the whole solution, why not give ASP.NET MVC a go? :-)
Actually there used to be, not sure if it's still available, to put a VB file in a C# project. You would have needed to add a text file type but name it with a .vb extension. Then place it in a folder. Then in the app or web config, you needed to add some config to tell the runtime where to find the vb files and to use VB compiler to compile the code.
It worked but was clunky and not recommended. Again, not sure if it's available anymore.
Personally, if you have VB code, use a vb2cs converter like this one to begin converting it over. They are not perfect but it's at least a good start in most cases.
Several years before I started working at this job another developer who is no longer here wrote an application in classic ASP using HTML, vbscript and javascript. This is fine but the problem is that 2 pages were written in C# with an HTML file and a code behind file. There was no solution files for these two pages. They may have been originally created in Visual Studio but they don't exist in it now.
That is important because there is a lot of things that Visual Studio just does for you without even thinking.
My problem is that in these two C# pages I need to get them to reference a DLL. This is a simple task when using Visual Studio. You just add a reference to the project and life is good. But outside of VS nothing seems to work.
I tried putting the dll in the same folder as the pages and then I tried the following:
Using myDLL;
myDLL dll = new myDLL();
myDLL dll = myDLL();
I found some code online that said to create an internal static class and use [DLLImport()] but that didn't work either. It couldn't find the dll or the Entry Point for the dll. I am currently researching how to create an entry point, just in case this is the method to make everything work.
Outside of having to rewrite these pages in vbscript (which I don't have the time to do) I am at a loss.
Has anyone ran into this problem before? Is there something that I can put in the web.Config? Or is this just impossible and I am hosed.
BTW this is all running under the 2.0 .net framework.
If you drop the DLL you want the code to reference into the bin folder of the website, then open the web.config and locate the following section configuration -> system.web -> compilation -> assemblies.
You need to add the display name of the assembly to that list - so that the compiler will reference that assembly during it's late-bound build process.
Now you should be able to use the stuff that's in it on those pages.
If you don't the know the display name of the assembly (typically yourassembly, version=*.*.*.*, Culture=neutral, PublicKeyToken=null for culture-invariant, non-strong-named assemblies) you can open it in a tool like ILSpy (there are others, it's just become my favourite) and it tells you when you select it in it's UI:
sorry for the poor highlighting - jerky hand following far too much coffee
If all the code in that assembly is in a single namespace, also, you can also add a default using to all the .cs or .aspx code in the project by adding that namespace to configuration -> system.web -> pages -> namespaces - making it simpler to use that code in the pages.
I created a VS Solution/Project for my app. I compiled and published it to the web server. When I published it I had it copy all project files.
I ran it and it crashed because it could not find my dll.
I tried adding the lines that Andras mentioned above and it seemed like it was getting me closer but it only changed the errors I was getting.
Then I went into IIS on the web server. I expanded the folder listing under Web Site. I right clicked on the folder that contained my app and made that folder into an application folder.
After I did that everything just worked. So then I thought I would see what happened if I backed out all of the additional code I added to my C# app and the Web.Config file. It still worked. All I needed to do was to make the folder an application folder in IIS and put a Using statement in my C# app and life is wonderful again.
Thanks for all the comments and suggestion. Andras thanks for the link to ILSpy. That is a cool little tool.
Take care,
Robert
I agree with Jon, it sounds like you should try creating a new project for these files. It's always better to leave code better off than you found it. If a new project is not an option for some reason, you should indicate this in your question.
I have a web application that I'm working on (ASP.NET 2.0 with C#, using Visual Studio 2005). Everything was working fine, and all of a sudden I get the error:
Error 1 The name 'Label1' does not exist in the current context
and 43 others of the sort for each time that I used a control in my code behind page.
This is only happening for one page. And it's as if the code behind page isn't recognizing the controls. Another interesting thing is that the IntelliSense isn't picking up any of the controls either..
I have tried to clean the solution file, delete the obj file, exclude the files from the project then re-add them, close Visual Studio and restart it, and even restart my computer, but none of these have worked.
I know this is an old question, but I had a similar problem and wanted to post my solution in case it could benefit someone else. I encountered the problem while learning to use:
ASP.NET 3.5
C#
VS2008
I was trying to create an AJAX-enabled page (look into a tutorial about using the ScriptManager object if you aren't familiar with this). I tried to access the HTML elements in the page via the C# code, and I was getting an error stating the the identifier for the HTML ID value "does not exist in the current context."
To solve it, I had to do the following:
1. Run at server
To access the HTML element as a variable in the C# code, the following value must be placed in the HTML element tag in the aspx file:
runat="server"
Some objects in the Toolbox in the Visual Studio IDE do not automatically include this value when added to the page.
2. Regenerate the auto-generated C# file:
In the Solution Explorer, under the aspx file there should be two files: *.aspx.cs and *.aspx.designer.cs. The designer file is auto-generated.
Delete the existing *.aspx.designer.cs file. Make sure you only delete the designer file. Do not delete the other one, because it contains your C# code for the page.
Right-click on the parent aspx file or Project menu. In the pop-up menu, select Convert to Web Application.
Now the element should be accessible in the C# code file.
Check your code behind file name and Inherits property on the #Page directive, make sure they both match.
exclude any other pages that reference the same code-behind file, for example an older page that you copied and pasted.
I had the same problem. It turns out that I had both "MyPage.aspx" and "Copy of MyPage.aspx" in my project.
Also, make sure you have no files that accidentally try to inherit or define the same (partial) class as other files. Note that these files can seem unrelated to the files where the error actually appeared!
I ran into this same error, except it was a WPF error. I was rearranging projects and had a control defined in like this:
<local:CustomControl Name="Custom" />
In my code behind I tried using Custom.Blah, but I got the error:
The name 'Custom' does not exist in the current context
What did the trick for me was changing my control in Xaml to this:
<local:CustomControl x:Name="Custom" />
Hope this helps someone out there!
I get the same error after i made changes with my data context. But i encounter something i am unfamiliar with. I get used to publish my files manually. Normally when i do that there is no App_Code folder appears in publishing folder. Bu i started to use VS 12 publishing which directly publishes with your assistance to the web server. And then i get the error about being precompiled application. Then i delete app_code folder it worked. But then it gave me the Data Context error that you are getting. So i just deleted all the files and run the publish again with no file restrictions (every folder & file will be published) then it worked like a charm.
I had the same issue, my problem was not having space between two attributes"
AutoGenerateColumns="False"DataKeyNames="ProductID"
instead of
AutoGenerateColumns="False" DataKeyNames="ProductID"
I fixed this in my project by backing up the current files (so I still had my code), deleting the current aspx (and child pages), making a new one, and copying the contents of the backup files into the new files.
this error often occurs when you miss runat="server" .
I had the same issue since i was tring to re produce the aspx file from a visual studio 2010 project so the controls had clientidmode="Static" property. When this is removed it was resolved.
I had a similar problem when tweaking with a Repeater after converting it from a DataList.
Problem was that I accidentally united 2 attributes when deleting an unneeded one.
<asp:Repeater runat="server" ID="ClientsRP"DataSourceID="ClientsDS">
.
.
.
</asp:Repeater>
And this prevented the generation of the repeater in the design file.
I had the same error message. My code was error-free and working perfectly, then I decided to go back and rename one of my buttons and suddenly it's giving me a compile error accompanied by that blue squiggly underline saying that the control doesn't exist in current context...
Turns out Visual Studio was being dumb, as the problem was related to the backup files I had made of my aspx.cs class. I deleted those and the errors went away.
In my case, when I created the web form, it was named as WebForm1.aspx and respective names (WebForm1). Letter, I renamed that to something else. I renamed manually at almost all the places, but one place in designer file was still showing it as 'WebForm1'.
I changed that too and got rid of this error.
1) Check the CodeFile property in <%#Page CodeFile="filename.aspx.cs" %> in "filename.aspx" page , your Code behind file name and this Property name should be same.
2)you may miss runat="server" in code
In my case I had to hunt through the 417 "controlname not found" errors to find an actual error: I had replaced a DLL but not updated the version number in the web.config. Fixed that and built successfully, 3 minutes after that all the other errors had resolved themselves.
Solution option #2 offered above works for windows forms applications and not web aspx application. I got similar error in web application, I resolved this by deleting a file where I had a user control by the same name, this aspx file was actually a backup file and was not referenced anywhere in the process, but still it caused the error because the name of user control registered on the backup file was named exactly same on the aspx file which was referenced in process flow. So I deleted the backup file and built solution, build succeeded.
I ran into this same issue. Apparently, you shouldn't call a class in the DLL the same name as one of the .aspx/.aspx.cs files. I thought they would not be in the same scope, etc. but it messed with Visual Studio's internal workings too much. I'm a bit surprised there isn't something to keep you from doing this if it is going to produce that type of error. Anyway, just delete the .aspx/.aspx.cs files and rebuild your project. Then bring them back in under another name. You can copy/paste your code into another editor if you don't want to retype it all back in.