selectsinglenode-SelectSingleNode取不到值

SelectSingleNode取不到值

 xml文件內容如下：
 <configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
    </startup>

  <applicationSettings>
    <test1.Properties.Settings>
      <setting name= 'AppConnection' value=''/>      
    </test1.Properties.Settings>
  </applicationSettings>
</configuration>

取值的代碼：
string configFileName = Application.ExecutablePath + ".config";
                    MessageBox.Show(configFileName);
                    System.Xml.XmlDocument doc = new System.Xml.XmlDocument();
                    doc.Load(configFileName);
                    string configString = @"configuration/applicationSettings/test1.Properties.Settings/setting[@name='AppConnection']/value";
                    System.Xml.XmlNode configNode = doc.SelectSingleNode(configString);

在最後的 configNode 那裡總是取不到值。大神幫忙看一下問題出在哪兒

最佳回答：

你的value是屬性，不是節點，當然選不出，去掉/value

         string configString = @"configuration/applicationSettings/test1.Properties.Settings/setting[@name='AppConnection']";
        System.Xml.XmlNode configNode = doc.SelectSingleNode(configString);
        MessageBox.Show(configNode != null && configNode.Attributes["value"] != null ? configNode.Attributes["value"].Value : "NULL");