-
更新或新增[appSettings]节点的子节点值
/// <summary>
/// 更新或新增[appSettings]节点的子节点值,存在则更新子节点Value,不存在则新增子节点,返回成功与否布尔值
/// </summary>
/// <param name="configFileName">app.config路径</param>
/// <param name="key">键</param>
/// <param name="value">值</param>
/// <returns></returns>
public static bool UpdateOrCreateAppSetting(string configFileName, string key, string value)
{
bool isSuccess = false;
string filename = configFileName;
//filename = System.Windows.Forms.Application.ExecutablePath + ".config";
XmlDocument doc = new XmlDocument();
doc.Load(filename); //加载配置文件
XmlNode node = doc.SelectSingleNode("//appSettings"); //得到[appSettings]节点
try
{
////得到[appSettings]节点中关于Key的子节点
XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");
if (element != null)
{
//存在则更新子节点Value
element.SetAttribute("value", value);
}
else
{
//不存在则新增子节点
XmlElement subElement = doc.CreateElement("add");
subElement.SetAttribute("key", key);
subElement.SetAttribute("value", value);
node.AppendChild(subElement);
}
//保存至配置文件(方式一)
using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))
{
xmlwriter.Formatting = Formatting.Indented;
doc.WriteTo(xmlwriter);
xmlwriter.Flush();
}
////保存至配置文件(方式二)
//doc.Save(filename);
isSuccess = true;
}
catch (Exception e)
{
isSuccess = false;
//输出的调试字符串
string strOuput = string.Format("更新或新增[appSettings]节点的子节点值失败:{0}\n", e.Message);
MessageBox.Show(strOuput);
}
return isSuccess;
}
- 删除[appSettings]节点中包含Key值的子节点
/// <summary>
/// 删除[appSettings]节点中包含Key值的子节点,返回成功与否布尔值
/// </summary>
/// <param name="configurationFile">要操作的配置文件名称,枚举常量</param>
/// <param name="key">要删除的子节点Key值</param>
/// <returns>返回成功与否布尔值</returns>
public static bool DeleteByKey(string configFileName, string key)
{
bool isSuccess = false;
string filename = configFileName;
XmlDocument doc = new XmlDocument();
doc.Load(filename); //加载配置文件
XmlNode node = doc.SelectSingleNode("//appSettings"); //得到[appSettings]节点
////得到[appSettings]节点中关于Key的子节点
XmlElement element = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");
if (element != null)
{
//存在则删除子节点
element.ParentNode.RemoveChild(element);
}
else
{
//不存在
}
try
{
//保存至配置文件(方式一)
using (XmlTextWriter xmlwriter = new XmlTextWriter(filename, null))
{
xmlwriter.Formatting = Formatting.Indented;
doc.WriteTo(xmlwriter);
xmlwriter.Flush();
}
isSuccess = true;
}
catch (Exception e)
{
//输出的调试字符串
string strOuput = string.Format("删除[appSettings]节点中包含Key:{0}值的子节点失败:{1}\n", key, e.Message);
MessageBox.Show(strOuput);
}
return isSuccess;
}
- 依据[appSettings]节点中的Key值获取value值
/// <summary>
///依据app.config中的Key获取value
/// </summary>
/// <param name="configPath">配置文件路径</param>
/// <returns></returns>
private static string GetAppConfig(string configPath,string key)
{
var doc = new System.Xml.XmlDocument();
doc.Load(configPath);
//找出名称为“add”的所有元素
var nodes = doc.GetElementsByTagName("add");
for (int i = 0; i < nodes.Count; i++)
{
//获得将当前元素的key属性
var xmlAttributeCollection = nodes[i].Attributes;
if (xmlAttributeCollection != null)
{
var att = xmlAttributeCollection["key"];
if (att == null) continue;
//根据元素的第一个属性来判断当前的元素是不是目标元素
if (att.Value != key) continue;
att = xmlAttributeCollection["value"];
return att.Value;
}
break;
}
return "";
}
参考链接:https://blog.csdn.net/wzk456/article/details/49001391