从web.config中读取连接字符串

How can i read connection string from web.config file in to a public class in class library. i've tried

如何从web读取连接字符串。配置文件到类库中的公共类中。我试过了

WebConfigurationManager

ConfigurationManager

but these are not recognized in class library

但是这些在类库中是不能识别的

12 个解决方案

#1

153

Add System.Configuration as a reference.

添加系统。配置作为参考。

For some bizarre reason it's not included by default.

出于某种奇怪的原因，默认情况下不包括它。

#2

452

You need to add a reference to System.Configuration and then use:

您需要向系统添加一个引用。配置,然后使用:

System.Configuration.ConfigurationManager.
    ConnectionStrings["connectionStringName"].ConnectionString;

#3

// Add a using directive at the top of your code file    
using System.Configuration;

// Within the code body set your variable    
string cs = ConfigurationManager.ConnectionStrings["connectionStringName"].ConnectionString;

' Add an Imports statement at the top of your code file    
Imports System.Configuration

' Within the code body set your variable    
Dim cs as String = ConfigurationManager.ConnectionStrings("connectionStringName").ConnectionString

#4

Add System.Configuration as a reference then:

添加系统。配置作为参考:

 using System.Configuration;

 ...

 string conn = 
    ConfigurationManager.ConnectionStrings["ConnectionName"].ConnectionString;

#5

I guess you need to add a reference to the System.Configuration assembly if that have not already been added.

我想你需要给系统添加一个引用。如果还没有添加配置程序集。

Also, you may need to insert the following line at the top of your code file:

此外，您可能需要在代码文件的顶部插入以下一行:

using System.Configuration;

#6

In VB : This should work

在VB中:应该可以

ConfigurationManager.ConnectionStrings("SQLServer").ConnectionString

In C# it would be (as per comment of Ala)

在c#中，它将是(根据Ala的评论)

ConfigurationManager.ConnectionStrings["SQLServer"].ConnectionString

#7

using System.Configuration;


string conn = ConfigurationManager.ConnectionStrings["ConStringName"].ToString();

#8

You have to invoke this class on the top of your page or class :

您必须在页面或类的顶部调用这个类:

using System.Configuration;

Then you can use this Method that returns the connection string to be ready to passed to the sqlconnection object to continue your work as follows:

然后您可以使用此方法返回要传递给sqlconnection对象的连接字符串，以继续您的工作，如下所示:

    private string ReturnConnectionString()
    {
       // Put the name the Sqlconnection from WebConfig..
        return ConfigurationManager.ConnectionStrings["DBWebConfigString"].ConnectionString;
    }

Just to make a clear clarification this is the value in the web Config:

澄清一下，这是web配置中的值:

  <add name="DBWebConfigString" connectionString="....." />   </connectionStrings>

#9

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.DataVisualization.Charting;
using System.Web.UI.WebControls;

string constring = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
                using (SqlConnection con = new SqlConnection(constring))

BELOW WEB>CONFIG FILE CODE

以下网络>配置文件的代码

<connectionStrings>
    <add name="ABCD" connectionString="Data Source=DESKTOP-SU3NKUU\MSSQLSERVER2016;Initial Catalog=TESTKISWRMIP;Integrated Security=True" providerName="System.Data.SqlClient"/>
  </connectionStrings>

In the ablove Code ABCD is the Connection Name

在ablove代码中ABCD是连接名。

#10

using System.Configuration;


string connString = ConfigurationManager.ConnectionStrings["ConStringName"].ToString();

Remember don't Use ConnectionStrings[index] because you might of Global machine Config and Portability

记住不要使用ConnectionStrings[index]，因为您可能需要全局机器配置和可移植性

#11

First add this:

第一次添加:

using System.Configuration;

#12

Everybody seems to be suggesting that adding

每个人似乎都在建议增加

using System.Configuration;

which is true.

这是真实的。

But might I suggest that you think about installing ReSharper's Visual Studio extension?

但是我可以建议你考虑安装ReSharper Visual Studio扩展吗?

With it installed, instead of seeing an error that a class isn't defined, you'll see a prompt that tells you which assembly it is in, asking you if you want it to add the needed using statement.

安装之后，您将看到一个提示符，提示符告诉您它所在的程序集，并询问您是否希望它添加所需的using语句。

#1

153