I was trying to use the solution found in this post:
How to access the folder path in web config using c#
but I get a null reference exception (System.Collections.Specialized.NameValueCollection.this[string].get returned null)?
I have this in my web config file (it's inside the configuration like shown in the post linked above):
<appSettings>
<add key="SessionTest" value="C:\\Settings\\XmlDir\\Session\\20180824.xml"/>
</appSettings>
and retrieve it like so:
string path = System.Web.Configuration.WebConfigurationManager.AppSettings["SessionTest"].ToString();
Is there something simple that I'm missing here? The file exists in the folder (and I copied the path from the file explorer, so I'm having trouble understanding what is causing the null exception >.<")
Thanks in advance :)
As far as I'm aware this is the standard way to access web.config <appSettings>
System.Configuration.ConfigurationManager.AppSettings["SessionTest"]
There was a second web config file that I wasn't aware of (I'm working on an old project so I didn't realize the first team that wrote this had added one to the folder I was working in, which in hindsight is probably a little strange)
When I added it to the web config file that is associated with the entire solution and not the one inside the folder I was working in, I was able to retrieve the value successfully!
I want to also note I included SLaks suggestion from the comment he made (which is not to say it doesn't work with the double slashes, but I didn't include them when I found success so I can't confirm that).
Related
I have a asp.net website and i want to test it on a domain.
The problem is I have already a site hosted on it and i cannot change it.
So I tried to create a sub-directory and uploaded my project in it.
The problem here arises with the web.config file as i want the inner project to link to another some other database.
Also the app_code folder is different for the inner project.
I thought of creating a sub-domain, but cannot do so, as i have no permissions.
Please help with some solution.
You can create app_code and web.config file in every folder. There is no issue in doing that.
But for web.config file there are some restriction about tag used in sub folder web.cofig file. A useful link
http://weblogs.asp.net/jongalloway//10-things-asp-net-developers-should-know-about-web-config-inheritance-and-overrides
It sounds like you need to clear your connection strings on the inner project web.config and add the new connection string.
In the "inner" project, add <clear /> inside the <connectionStrings> node and then add your connection string in with test db connection string after they are cleared. This way it will not pick up the outer (live) site web.config connection string.
Warning - testing on a live site can always be tricky. Be careful!
I have a console application in which website project is added as dll. Inside dll ConfigurationManager.ConnectionStrings["XXX"] is called which is always returning null.
But web.config in dll has connectionstring named 'XXX'. Can any one suggest what is going wrong?
I don't think .config file of the .dll is added to your console project together with the dll. You need to have the .config in your executing project.
Try copying the config file to your console project. Or at least the connection strings section. Probably in an App.config.
I had a slightly different problem that I haven't seen an answer to. I was using.
ConfigurationManager.ConnectionStrings["XXXX"].ConnectionString;
When I opened up web.config I saw that the connection string I had created was prefixed with "WebApplicationAPI.Properties.Settings." - putting the entire string in worked for me:
ConfigurationManager.ConnectionStrings["WebApplicationAPI.Properties.Settings.XXXX"].ConnectionString;
Your config file is not in the .dll. So you're referencing nothing I would suspect! Unless you've manually copied the web.config file to the correct location or references it via an absolute path?
web.config is for web application.
For console application you have to use app.config.
Well, actually that's the default configuration for C#, I won't be surprised some advanced user could make it go the other way arround.
I have looked around and simply cannot find a way to open a linked XML file. My folder structure is like this:
...\projects\ConfigService\
...\projects\Shared\
...\projects\WebTool\
Inside the Shared folder I have a single XML file that will be modified by the WebTool project and read by the ConfigService (many times after each one is built and running). To make things as simple as possible, I simply tried "add as link" at the XML in each project, but then how do I actually get a full path to the linked object so I can open it? I use a link because the file will be changed after my projects are built, but I will not rebuild.
All answers I have found either try to pack the linked file into the project's binary, or the instructions are for adding classes/code instead of just a flat resource.
Or is there a better way to do this?
The solution that worked out best for him was to use the Server.MapPath() method to find his Shared folder regardless of where in the file system his website was rooted. Since it will always be [virtual-directory]\Shared this works out perfectly and he doesn't need to worry about config settings.
I think you want to use an app.config file to resolve this. Here's how you would do it.
In the WebTool service, and in the Config service, add an app.config file with the following text:
<configuration>
<appSettings>
<add key="XmlFileLocation" value="c:\folder\projects\shared\myfile.xml" />
</appSettings>
</configuration>
Then, you can retrieve the file location in each program by using the following:
string filepath = ConfigurationManager.AppSettings["XmlFileLocation"];
You'll have to add a reference to System.Configuration in your projects though.
Good luck!
Two ways to go
One depends on how you are going to deploy. If they are all going to same folder, the Mr Oded's solution is a quick and simple.
If you are deploying to a more complex folder structure e.g
MyApps
Shared
ConfigService
WebTool
The create a folder structure that mirrors that and set the output directory in each project to the relevant one (instead of the default bin\debug bin\release). The you can grab it with a relative path from from each tool e.g. (..\MyXmlFile.xml).
That said, I like neither of the above.
What else in shared? If there's a dll, then may be it should have a method that returns the location of the file, or the content, and let it manage where that location is.
PS don't forget seeing as it is exposed on the file system (somewhere), you need to cope with some well meaning individual deleting or modifying it.
I have a VC2010 C# Solution, with a number of projects in it.
So for example, I have a web project, and I have a class library.
In the web.config file, I have a key in the <appSettings> section, e.g.
<add key="FileDirectory" value="G:\ftproot\sales" />
I have also added a key in the Web.Production.config file to reflect the file directory on the server.
So when I reference it in my web project (It's MVC) - I do so like this:
var FTPPath = ConfigurationManager.AppSettings["FileDirectory"];
this works fine within my web project. However, I also need to reference this in the class library, which gets to my question - Is there a way to reference a key in the web.config file from another project, e.g. a class library, in the same solution??
All help is appreciated.
Thanks
Yes you can use exactly the same code. .Net will look up the configuration key in the config file of the application which started the app domain. A class library used by such an application will have access to it's config file.
class libraries do not have their own configuration. They use the configuration of which ever executable they are being used in.
This means that for you you should be able to use the same code, and it will read the setting from the config (assuming that it is there).
This is not always convenient though (for example if you write a .net based plugin for a MMC snap-in, as this means you have to modify the mmc.exe.config in the system folder.)
You might be better having a method to pass this required configuration setting into you library code. then in apps where you control the config you can just read it from there and pass it in, and in apps where you can't you can use another approach, like reading from the registry or from a manually read config file. Or have the best of both worlds and make it so you can pass it in, and if this is not done it attempts to read it from the default configuration.
This question has some more details on the pitfalls associated with dll configuration, but also has some techniques for doing it if you need to.
I've developed a windows service application using Visual Studio 2008 / C#.
I have an app.config file in the project. When installed, the app.exe.config file appears beside the executable but it appears not to be reading the values from it when I try to access them through ConfigurationManager.AppSettings.
Has it copied the config file elsewhere or is there some other problem I don't know about?
Thanks in advance,
Martin.
Edit:
The config file name is infact my_exe_file_name.exe.config, it looks like:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="RuntimeFrequency" value="3" />
</appSettings>
</configuration>
and I am trying to read via:
ConfigurationManager.AppSettings["RuntimeFrequency"]
The debug value I continually see is '1' and not '3'. Am I doing something wrong here?
I located the error and it was related to file permissions. After installing the service, my local user account didn't have access to modify the app.exe.config file.
The tool I was using to edit was not informing me it was being denied access to save the file - that's notepad++ if anyone is interested - so I couldn't see that it wasn't saving over the old config file.
Solved now, thanks everyone.
Martin.
When you are in debug mode check and see what settings are in the my_exe_file_name.vshost.exe.config Also make sure you adjust this in the app.config file. Visual studio should update the final config file in your bin/debug folders.
Maybe you are updating the wrong config file. You should double check that using
System.Configuration.ConfigurationManager.OpenExeConfiguration(PATH_TO_CONFIG);
Generally for the Windows Services that I write, i drop the appName.exe.config file into C:\WINDOWS\system32\
Perhaps you have an older version in that directory, which is where your service is getting the value, even though you've updated the config file in your project.
App.config file should be renamed to your_exe_file_name.exe.config and placed near the exe file.
Is it possible that you have more than one instance of the RuntimeFrequency entry defined? The ConfigurationManager reads the file from top to bottom and processes each setting individually. Therefore, the last value of RuntimeFrequency that is defined in the file is the one it will use.
If you want to know for sure if your file is being used, I would simply remove or comment out any definition for RuntimeFrequency (copy/paste errors do happen) and wait to see an application error when ConfigurationManager attempts to reference an entry in AppSettings that does not exist.