如何从WCF访问其他项目的web.config中的连接字符串

Question

I'm having some difficulty to access the connectionstrings in web.config from a WCF "web services"

cenario: a solution inside visual studio 2010 with 2 web projects, placement and wcfPlacement. the web.config that has the connectionstings are inside the placement project.

The wcfPlacement does not have a web.config as you can see in the picture, but when I build it, it generates one.

from the placement project I can access the connection strings using ConfigurationManager.ConnectionStrings["XX"].ConnectionString; - ok.

but if I'm inside the service, it gives me an error when I try to access, forcing me to have a connection string declared inside each class that I want database access, and that's not good.

How can I access the connectionstrings that are in th web.config inside the placement project from the wcf ?

I tried:

SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["webV"].ConnectionString);

but it gives me an error: System.NullReferenceException: Object reference not set to an instance of an object. at wcfPlacement.Prospect.doLogin(String login, String senha)

tried this inside a class:

System.Configuration.Configuration rootWebConfig =
            System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("/placement");
            System.Configuration.ConnectionStringSettings connString;
            if (rootWebConfig.ConnectionStrings.ConnectionStrings.Count > 0)
            {
                connString =
                    rootWebConfig.ConnectionStrings.ConnectionStrings["NorthwindConnectionString"];
                if (connString != null)
                    Console.WriteLine("Northwind connection string = \"{0}\"",
                        connString.ConnectionString);
                else
                    Console.WriteLine("No Northwind connection string");
            }

but I get this error. Error 1 The type or namespace name 'Configuration' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)

Answer 1

You have to add reference to System.Configuration namespace.

https://msdn.microsoft.com/en-us/library/system.configuration(v=vs.110).aspx