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Ask "about the use of the configuration architecture under. net2.0"
Fandango

Hello, I am very benefited from reading the article "using the configuration architecture under. net2.0" in your blog. I encountered a problem when I wrote an application configuration module in the past two days. I 'd like to ask you :)
You have. the usage of the configuration architecture under net2.0 "describes the configurationsection, configurationelementcollection, and configurationelement classes. I applied them to my read app. in the config configuration file code, the effect is good. my app. the content and source code of the config file are as follows:
[App. config]:
------------------------------------------------------
<? XML version = "1.0" encoding = "UTF-8"?>
<Configuration>
<Configsections>
<Section name = "systems" type = "testapp. configuration. systemssection, testapp"/>
</Configsections>
<Systems>
<System name = "production" Server = "prodserver" database = "Prod"/>
<System name = "Demo" Server = "demoserver" database = "Demo"/>
<System name = "testing" Server = "testserver" database = "test"/>
<System name = "development" Server = "devserver" database = "Dev"/>
</Systems>
</Configuration>
[Source program]:
------------------------------------------------------
[Systemssection. CS]:
Using system;
Using system. Collections. Generic;
Using system. configuration;
Using system. text;
Namespace testapp. Configuration
{
Public sealed class systemssection: configurationsection
{
Public systemssection ()
{
}
[Configurationproperty ("", isdefaultcollection = true)]
Public systemscollection Systems
{
Get
{
Return (systemscollection) base [""];
}
}
}
}
[Systemscollection. CS]:
Using system;
Using system. Collections. Generic;
Using system. configuration;
Using system. text;
Namespace testapp. Configuration
{
Public sealed class systemscollection: configurationelementcollection
{
Protected override configurationelement createnewelement ()
{
Return new systemelement ();
}
Protected override object getelementkey (configurationelement element)
{
Return (systemelement) element). Name;
}
Public override configurationelementcollectiontype collectiontype
{
Get
{
Return configurationelementcollectiontype. basicmap;
}
}
Protected override string elementname
{
Get
{
Return "system ";
}
}
}
}
[Systemelement. CS]:
Using system;
Using system. Collections. Generic;
Using system. configuration;
Using system. text;
Namespace testapp. Configuration
{
Public sealed class systemelement: configurationelement
{
[Configurationproperty ("name", iskey = true, isrequired = true)]
Public string name
{
Get
{
Return (string) base ["name"];
}
Set
{
Base ["name"] = value;
}
}
[Configurationproperty ("server", isrequired = true)]
Public String Server
{
Get
{
Return (string) base ["server"];
}
Set
{
Base ["server"] = value;
}
}
[Configurationproperty ("Database", isrequired = true)]
Public String Database
{
Get
{
Return (string) base ["Database"];
}
Set
{
Base ["Database"] = value;
}
}
Public override string tostring ()
{
String output = "systemelement: \ n ";
Output + = string. Format ("name = {0} \ n", name );
Output + = string. Format ("Server = {0} \ n", server );
Output + = string. Format ("database = {0} \ n", database );
Return output;
}
}
}
------------------------------------------------------
[Demo]:
Public void readappconfig ()
{
Configurationsection syssection = configurationmanager. getsection ("systems") as configurationsection;
Systemssection Ss = (systemssection) syssection;
Systemscollection onecollection = ss. systems;
Foreach (systemelement oneelement in onecollection)
{
Console. writeline (oneelement. tostring ());
}
}
------------------------------------------------------
[Output]:
Systemelement:
Name = Production
Server = prodserver
Database = Prod
Systemelement:
Name = demo
Server = demoserver
Database = demo
Systemelement:
Name = testing
Server = testserver
Database = test
Systemelement:
Name = Development
Server = devserver
Database = Dev
------------------------------------------------------
The program has been successfully written here, but I have other requirements to implement. I want to put the above app. the content in the config file is saved in the custom configuration file for reading when the program is running, for example, D: \ testapp \ My. config file. based on the routine provided in your article, I wrote another DEMO code:
------------------------------------------------------
[Demo]:
Public void readmyconfig ()
{
Execonfigurationfilemap filemap = new execonfigurationfilemap ();
Filemap. execonfigfilename = @ "D: \ testapp \ My. config ";
Configuration CFG = configurationmanager. openmappedexeconfiguration (filemap, configurationuserlevel. None );
Systemssection Ss = cfg. getsection ("systems") as systemssection
Systemscollection onecollection = ss. systems;
Foreach (systemelement oneelement in onecollection)
{
Console. writeline (oneelement. tostring ());
}
}
However, the return value of the "cfg. getsection (" systems ") as systemssection" statement is null. I really don't know how to solve this problem. Thank you for your advice.

Sorry, I have been busy for a while. I didn't see this message, but now I have no idea whether you can see it.

You said that the returned section through getsection ("") is null. I think you should set a breakpoint here to check which sessions exist in the CFG configuration you read. I think it is easy to find out the problem.

Two problems that are easy to occur: sessions does not have the system session. Check the file or the configuration type is incorrect. It should be easy to identify the problem.

I use

Cfg. sessions ["systems"] As systemssection.

Hope to help you.