Where is ConfigurationManager's namespace?

问题

I've got a reference to System.Configuration - and ConfigurationSettings is found no problem - but the type or namespace 'ConfigurationManager' could not be found!?

I've read around - and it looks like it should belong to the same namespace as the ConfigurationSettings class.

EDIT: Please take note - I've clearly said I have added a reference to System.Configuration. There's been 4 comments already about this.

回答1:

ConfigurationManager is a part of the System.Configuration after .Net 2.0. Add a reference to the System.Configuration dll. Try using System.Configuration.ConfigurationManager.

回答2:

You need to use the System Configuration namespace, this must be included in two ways:

Right click the project and choose add reference, browse "Assemblies" and tick the System.Configuration assembly.
Include the namespace in code:

using System.Configuration;

回答3:

You need to add a reference the System.Configuration assembly. This namespace was split across a few assemblies.

回答4:

You will need to add the System.Configuration reference under the Reference folder in your project. Only adding the system.configuration with the using statement in your class is not enough.

回答5:

I'm working in VisualStudio 2015, and ConfigurationManager is not present at System.Configuration namespace anymore.

I was just trying to read the App.config file...

Then I found a solution:

Get:

string str = MyProjectNamespace.Properties.Settings.Default["MySettingName"].ToString();

Set:

MyProjectNamespace.Properties.Settings.Default["MySettingName"]="myString";
MyProjectNamespace.Properties.Settings.Default.Save();

回答6:

I am using VS 2017, I added 'using System.Configuration' directive and also follow the step to add a reference assembly to the project but IDE still complaint configuration manager does not exist, it turn out it is due to the .net core installed by Nuget just add a empty container. The package System.Configuration.Configurationmanager 4.5.0 need to be installed as well. Start Tools -> Nuget Package Manager -> Package Manager Console and type "Install-Package System.Configuration.ConfigurationManager -Version 4.5.0" and this resolve the problem. Refer below screenshot in Object Browser in VS2017

回答7:

For me, this problem was solved when I put the "BuildConnectionString" function in a class and added "Imports System.Configuration" at the top of the class page. I did as the Microsoft site itself says. https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/connection-string-builders

Private Sub BuildConnectionString(ByVal dataSource As String, _
ByVal userName As String, ByVal userPassword As String)

' Retrieve the partial connection string named databaseConnection
' from the application's app.config or web.config file.
Dim settings As ConnectionStringSettings = _
   ConfigurationManager.ConnectionStrings("partialConnectString")

If Not settings Is Nothing Then
    ' Retrieve the partial connection string.
    Dim connectString As String = settings.ConnectionString
    Console.WriteLine("Original: {0}", connectString)

    ' Create a new SqlConnectionStringBuilder based on the
    ' partial connection string retrieved from the config file.
    Dim builder As New SqlConnectionStringBuilder(connectString)

    ' Supply the additional values.
    builder.DataSource = dataSource
    builder.UserID = userName
    builder.Password = userPassword

    Console.WriteLine("Modified: {0}", builder.ConnectionString)
End If
End Sub

The important point is to use the function in the class. When I did this the error failed to find the source.

来源：https://stackoverflow.com/questions/12727721/where-is-configurationmanagers-namespace

标签

.net-3.5

reference

configurationmanager

system.configuration