[转载]C#读写配置文件(XML文件)

.xml文件格式如下

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE DataAccess[]>
<DataAccess>
  <appSettings>
    <add key="StartTime" value="9" />
    <add key="EndTime" value="6" />
  </appSettings>
</DataAccess>

 

C#初始化

private static XmlDocument xmlIAUConfig;

static ConfigManager()
{
    xmlIAUConfig = new XmlDocument();

    XMLPath = Assembly.GetExecutingAssembly().CodeBase;
    Int32 i = XMLPath.LastIndexOf("/");
    XMLPath = XMLPath.Remove(i);
    XMLPath = XMLPath + @"/abc.xml";
    xmlIAUConfig.Load(XMLPath);
}

 

获取某个节点的值

public static String GetValue(String key)
{
    xmlIAUConfig.Load(XMLPath);
    String value;
    String path = @"//DataAccess/appSettings/add[@key='" + key + "']";
    XmlNodeList xmlAdds = xmlIAUConfig.SelectNodes(path);

    if (xmlAdds.Count == 1)
    {
        XmlElement xmlAdd = (XmlElement)xmlAdds[0];

        value = xmlAdd.GetAttribute("value");
    }
    else
    {
        throw new Exception("IAUConfig配置信息设置错误：键值为" + key + "的元素不等于1");
    }

        return value;
}

 

修改某个节点为谋值

public static void SavaConfig(string strKey, string strValue)
{
    XmlDocument XMLDoc = new XmlDocument();
    XMLDoc.Load("abc.xml");
    XmlNodeList list = XMLDoc.GetElementsByTagName("add");


    for (int i = 0; i < list.Count; i++)
    {
        if (list[i].Attributes[0].Value == strKey)
        {
            list[i].Attributes[1].Value = strValue;
        }
    }
    StreamWriter swriter = new StreamWriter("abc.xml");
    XmlTextWriter xw = new XmlTextWriter(swriter);
    xw.Formatting = Formatting.Indented;
    XMLDoc.WriteTo(xw);
    xw.Close();
    swriter.Close();
}