如何在C＃中从web.config访问默认连接字符串

Question

我有以下配置的配置文件：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data" />
  </configSections>
  <dataConfiguration defaultDatabase="myConnectionString" />
  <connectionStrings>
    <add name="myConnectionString" connectionString="Data Source=mydatasource;Max Pool Size=100;Pooling=true; Initial Catalog=MyDB;User ID=Myuser;Password=Password;Connection Timeout=60" providerName="System.Data.SqlClient" />
  </connectionStrings>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
  </startup>
</configuration>

如您所见，我已经将默认数据dataconfiguration设置为使用myConnectionString作为默认连接字符串，但是在（c＃）后面的代码中，如何在不提供名称即myConnectionString情况下访问该连接字符串

所以在下面的代码中：

string connectionString = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;

SqlConnection cnn = new SqlConnection(connectionString);

SqlBulkCopy sbc = new SqlBulkCopy(cnn);

我想跳过硬编码连接字符串的名称。

Answer 1

var dataConfig = (Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings)System.Configuration.ConfigurationManager.GetSection(
    "dataConfiguration");

string connectionString = ConfigurationManager.ConnectionStrings[dataConfig.DefaultDatabase].ConnectionString;

从定制配置节和DatabaseSettings类的典型用法可以看出这一点。

编辑：我已经使用您的确切app.config在LINQPad中对其进行了测试，得到了结果：

Data Source=mydatasource;Max Pool Size=100;Pooling=true; Initial Catalog=MyDB;User ID=Myuser;Password=Password;Connection Timeout=60