C# Xml文件的读写总结

1  Xml写入

代码:

string path = "test.xml";

XmlTextWriter writeXml = new XmlTextWriter(path, Encoding.UTF8);
writeXml.WriteStartDocument(false);
writeXml.WriteStartElement("TemplateList");
writeXml.WriteComment("模板列表");

for (int i = 1; i <= 10; i++)
{
writeXml.WriteStartElement("Template" + i);//模板名
writeXml.WriteAttributeString("Id", "" + i);
writeXml.WriteAttributeString("Name", "模板" + i);
writeXml.WriteAttributeString("Unit", "省级");
writeXml.WriteAttributeString("DevType", i % 2 == 0 ? "64" : "128");
writeXml.WriteAttributeString("Version", "V1.0.0");
writeXml.WriteAttributeString("SwitchString", "");

for (int j = 1; j < 3; j++) //测试数据
{
writeXml.WriteStartElement("InPort");//输入口
writeXml.WriteAttributeString("InPortId", "" + j);
writeXml.WriteAttributeString("TemplateId", "" + i);
writeXml.WriteAttributeString("OutPort", "" + i);
writeXml.WriteEndElement();
}

writeXml.WriteEndElement();
}

writeXml.Flush();
writeXml.Close();
}

 此案例中，主要用到XmlTextWriter来创建xml，其中

WriteStartElement 创建节点

WriteComment 描述信息

WriteAttributeString 节点的属性

WriteEndElement 节点关闭

Flush 刷新流

Close 关闭写入

值得注意的是，有了WriteStartElement 就必须对应一个WriteEndElement ，创建节点的属性只需要把WriteAttributeString 写在WriteStartElement 

的后边即可!

2 获取节点

   假如我要获取Template1的所有子节点

XmlNodeList nodeList = xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).ChildNodes;

3 设置属性值

       假如我要修改template1的属性值

xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).Attributes["Name"].InnerText = info.Name;
xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).Attributes["Unit"].InnerText = info.Unit;
xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).Attributes["DevType"].InnerText = info.DevType;
xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).Attributes["Version"].InnerText = info.Version;
xmlDoc.SelectSingleNode("TemplateList//Template" + info.TemplateId).Attributes["SwitchString"].InnerText = info.SwitchString;

4 遍历节点

       假如我要遍历template1的所有子节点，并查找InPortId==“1”的节点，且删掉

foreach (XmlNode xn in nodeList)
{
XmlElement xe = (XmlElement)xn;
if (xe.Attributes["InPortId"].InnerText == "1")
{
// 找到相同项，删除掉
xmlDoc.DocumentElement.SelectSingleNode("Template" + info.TemplateId).RemoveChild(xn);
xmlDoc.Save(path);
break;
}
}

5 数据更新 - 1 

   C#  Code:

/// <summary>
/// 设备信息更新
/// </summary>
/// <param name="info"></param>
/// <returns></returns>
public static bool DeviceUpdate(DeviceDetail info)
{
bool bo = false;

try
{
XmlDocument xmlDoc = new XmlDocument();
string filePath = GetPath(info.DevId);
xmlDoc.Load(filePath);
XmlNode node = xmlDoc.SelectSingleNode("MatrixList//Device");
XmlElement ee = (XmlElement)node;
ee.SetAttribute("DevName", info.DevName);
ee.SetAttribute("DevType", info.DevType);
ee.SetAttribute("DevIp", info.DevIp);
ee.SetAttribute("DevPort", info.DevPort);
xmlDoc.Save(filePath);
bo = true;

}
catch (Exception ex)
{
Console.Write(ex.Message);
}

return bo;
}

代码调用:

DeviceDetail info = new DeviceDetail();
info.DevId = tbDevId.Text;
info.DevName = tbDevName.Text;
info.DevType = (cbbDevType.SelectedIndex == 0 ? 64 : 128).ToString();
info.DevIp = tbDevIp.Text;
info.DevPort = tbDevPort.Text;

bo = MatrixManager.DeviceUpdate(info);
if (bo == true)
{
MessageBox.Show("保存成功，请重启客户端!");
}
else
{
MessageBox.Show("保存失败!");
}

XML文件结构:

6 数据更新 - 2

C# Code：

/// <summary>
/// 热备份保存
/// </summary>
/// <param name="devId">设备id</param>
/// <param name="nodeStr">节点路径</param>
/// <param name="item">要修改的属性</param>
/// <param name="data">要修改的属性内容</param>
/// <returns></returns>
public static bool HotBackUpdate(string devId, string nodeStr, HotBackInfo info)
{
bool bo = false;

try
{
XmlDocument xmlDoc = new XmlDocument();
string filePath = GetPath(devId);
xmlDoc.Load(filePath);
XmlNode node = xmlDoc.SelectSingleNode(nodeStr);
XmlElement ee = (XmlElement)node;
ee.SetAttribute("ID", info.Card);
ee.SetAttribute("Mode", info.Mode);
ee.SetAttribute("Chunnel", info.Chunnel);
xmlDoc.Save(filePath);
bo = true;

}
catch (Exception ex)
{
Console.Write(ex.Message);
}

return bo;
}

代码调用:

MatrixManager.HotBackUpdate("1", "MatrixList//HotBack//Card" + (wedgeBox.SelectedIndex + 1), info);

MessageBox.Show("更新成功!");

XML结构: