[英]Read connection string from web.config
How can I read a connection string from a web.config
file into a public class contained within a class library?如何将
web.config
文件中的连接字符串读取到包含在 class 库中的公共 class 中?
I've tried:我试过了:
WebConfigurationManager
ConfigurationManager
But these classes are not recognized within my class library.但是这些类在我的 class 库中无法识别。
You need to add a reference to System.Configuration
and then use:您需要添加对
System.Configuration
的引用,然后使用:
System.Configuration.ConfigurationManager.
ConnectionStrings["connectionStringName"].ConnectionString;
Add System.Configuration
as a reference.添加
System.Configuration
作为参考。
For some bizarre reason it's not included by default.出于某种奇怪的原因,默认情况下它不包括在内。
C# C#
// 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;
VB VB
' 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
Add System.Configuration
as a reference then:然后添加
System.Configuration
作为参考:
using System.Configuration;
...
string conn =
ConfigurationManager.ConnectionStrings["ConnectionName"].ConnectionString;
I guess you need to add a reference to the System.Configuration assembly if that have not already been added.我猜您需要添加对System.Configuration程序集的引用(如果尚未添加)。
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行:
using System.Configuration;
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;
C# C#
string constring = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
using (SqlConnection con = new SqlConnection(constring))
BELOW WEB.CONFIG FILE CODE WEB.CONFIG 文件代码下方
<connectionStrings>
<add name="ABCD" connectionString="Data Source=DESKTOP-SU3NKUU\MSSQLSERVER2016;Initial Catalog=TESTKISWRMIP;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
In the above Code ABCD is the Connection Name在上面的代码 ABCD 是连接名称
In VB
: This should work在
VB
中:这应该有效
ConfigurationManager.ConnectionStrings("SQLServer").ConnectionString
In C#
it would be (as per comment of Ala)在
C#
中(根据 Ala 的评论)
ConfigurationManager.ConnectionStrings["SQLServer"].ConnectionString
You have to invoke this class on the top of your page or class:您必须在页面顶部或 class 上调用此 class:
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连接字符串以准备传递给 sqlconnection object 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:只是为了明确说明,这是 web 配置中的值:
<add name="DBWebConfigString" connectionString="....." /> </connectionStrings>
using System.Configuration;
string conn = ConfigurationManager.ConnectionStrings["ConStringName"].ToString();
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] 因为你可能会使用 Global machine Config and Portability
First add this:首先添加这个:
using System.Configuration;
Everybody seems to be suggesting that adding每个人似乎都建议添加
using System.Configuration;
which is true.这是真的。
But might I suggest that you think about installing ReSharper's Visual Studio extension?但是我可以建议您考虑安装 ReSharper 的 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.安装它后,您不会看到 class 未定义的错误,而是会看到一个提示,告诉您它在哪个程序集中,询问您是否希望它添加所需的 using 语句。
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