Question

我的一项要求是,要求我使用普林内联网,以获得在座标内储存的连接,然后将检索的连接注入一个瞬时物体。

我如何利用春天这样做。净Xml配置?

例如,我没有这样做的守则:

// Spring.net config:
<object name="myService" type="com.acme.MyService, com.acme">
    <constructor-arg type="System.String" value="myConnectionName"/>
</object>

// Web.config:
<connectionStrings>
    <add name="myConnectionName" connectionString="DB_connectionstring"/>
</connectionStrings>

// Codes:
public class MyService {
    public MyService(string connectionName) {
        var connectionString = ConfigurationManager.AppSettings[connectionName];
        // use connectionString to create a DB connection, etc
    }
}

我想这样说:

 // Spring.net config:
<object name="myService" type="com.acme.MyService, com.acme">
    <constructor-arg type="System.String" ref="retrievedConnectionString"/>
</object>    
// How to make a call similar to "ConfigurationManager.AppSettings[connectionName]" and get the connection string from Web.config and put inside "retrievedConnectionString"?

// Web.config:
<connectionStrings>
    <add name="myConnectionName" connectionString="DB_connectionstring"/>
</connectionStrings>

// Codes:
public class MyService {
    public MyService(string connectionString) {
        // use connectionString to create a DB connection, etc
    }
}

甚至可以打电话<代码> ConfigurationManager.AppSettings [.] from Spring.net xml config?

Answer 1

过去,我曾使用,以达到这一目的,但通过这一问题和bbaia的回答,我发现,这样做的最好办法是使用。 VariablePlaceholderConfigurer 。当你使用<代码>VariablePlace holderConfigurer而不是我的“expression-hack”,你不与appSettings /linkStrings位位位位位位位位别:您可转向 VariableSources /code>><<<<<<>>>>> 由春季提供。页: 1



方框外,春季,NET提供<代码>可变PlaceholderConfigurer,以从标准中检索变量。 诸如AppSettings,ConnectionStrings,UserSettings和ApplicationSettings。 bbaia的回答部分说明了这一点,你举了一个完整的例子。

"Expression hack": calling ConfigurationManager from xml config

因此,我不建议你这样做,但这是我过去使用的黑板,适用于你的配置:

<object object name="myService" type="com.acme.MyService, com.acme">
  <constructor-arg name="Connection" 
                   expression="T(System.Configuration.ConfigurationManager).ConnectionStrings[ myConnectionName ]" />
</object>


You can use this same approach for ConfigurationManager.AppSettings, e.g.:

<object object name="myService" type="com.acme.MyService, com.acme">
  <constructor-arg name="AnotherConstructorArgument" 
                   expression="T(System.Configuration.ConfigurationManager).AppSettings[ mySetting ]" />
</object>


VariablePlaceholderConfigurer: reference .NET settings from Spring.NET xml config

您可以轻而易举地配置一个<代码>可变的PlaceholderConfigurer,以便从标准中检索变量。诸如AppSettings,ConnectionStrings,UserSettings和ApplicationSettings。例如,考虑这一xml配置:

<?xml version="1.0" encoding="utf-8"?>
<objects xmlns="http://www.springframework.net" >

  <object type="Spring.Objects.Factory.Config.VariablePlaceholderConfigurer, Spring.Core">
    <property name="VariableSources">
      <list>
        <object type="Spring.Objects.Factory.Config.ConnectionStringsVariableSource, Spring.Core" />
        <object type="Spring.Objects.Factory.Config.ConfigSectionVariableSource, Spring.Core">
          <!-- Sections to read, sepearated by comma (leave out spaces) -->
          <property name="SectionNames"
                    value="appSettings,applicationSettings/q7991262.Properties.Settings,userSettings/q7991262.Properties.Settings" />
        </object>
      </list>
    </property>
  </object>

  <!-- Note that you have to append  .connectionstring  to the key! -->
  <object id="usingConnectionStringsVariableSource" 
          type="q7991262.MyService, q7991262">
    <property name="Connection" 
              value="${myConnectionName.connectionString}" />
  </object>

  <object id="configSectionVariableSource" 
          type="q7991262.MyService, q7991262">
    <property name="Connection" 
              value="${myConnectionNameAppSettings}" />
  </object>

  <object id="userSettingsSection" 
          type="q7991262.MyService, q7991262">
    <property name="Connection" 
              value="${myConectionNameUserSetting}" />
  </object>

  <object id="applicationSetting" 
          type="q7991262.MyService, q7991262">
    <property name="Connection" 
              value="${myConectionNameApplicationSetting}" />
  </object>

</objects>

本条案文为<代码>app.config:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="q7991262.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="q7991262.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>

  <connectionStrings>
    <add name="myConnectionName" 
         connectionString="From connection string section."/>
  </connectionStrings>

  <appSettings>
    <add key="myConnectionNameAppSettings" 
         value="From app setting section." />
  </appSettings>

  <userSettings>
    <q7991262.Properties.Settings>
      <setting name="myConectionNameUserSetting" serializeAs="String">
        <value>My connection from user settings.</value>
      </setting>
    </q7991262.Properties.Settings>
  </userSettings>

  <applicationSettings>
    <q7991262.Properties.Settings>
      <setting name="myConectionNameApplicationSetting" serializeAs="String">
        <value>My connection from application settings.</value>
      </setting>
    </q7991262.Properties.Settings>
  </applicationSettings>

</configuration>

这些配置从。该工作样本见。

Answer 2

Another solution is to use the VariablePlaceholderConfigurer : http://www.springframework.net/doc-latest/reference/html/objects.html#objects-variablesource

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<object type="Spring.Objects.Factory.Config.VariablePlaceholderConfigurer, Spring.Core">
  <property name="VariableSources">
    <list>
      <object type="Spring.Objects.Factory.Config.ConnectionStringsVariableSource, Spring.Core"/>
    </list>
  </property>
</object>

<object name="myService" type="com.acme.MyService, com.acme">
    <constructor-arg type="System.String" value="${myConnectionName.connectionString}"/>
</object>

Example from the Spring.NET forum: http://forum.springframework.net/showthread.php?3961

"Expression hack": calling `ConfigurationManager` from xml config

`VariablePlaceholderConfigurer`: reference .NET settings from Spring.NET xml config

友情链接