C#对XML、JSON等格式的解析
一、C#对XML格式数据的解析
1、用XMLDocument来解析
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load("test.xml");
//创建新节点
XmlElement nn = xmlDocument.CreateElement("p_w_picpath");
nn.SetAttribute("p_w_picpathUrl", "6.jpg");
XmlNode node = xmlDocument.SelectSingleNode("content/section/page/gall/folder");//定位到folder节点
node.AppendChild(nn);//附加新节点
//保存
xmlDocument.Save("test.xml");2、用Linq to XML来解析
可以通过遍历，来获得你想要的节点的内容或属性
XElement root = XElement.Load("test.xml");
foreach (XAttribute att in root.Attributes())
{
root.Add(new XElement(att.Name, (string)att));
}
Console.WriteLine(root);3、附一个详细点的例子
比如要解析如下的xml文件，将其转化为Ilist对象。
<?xml version="1.0" encoding="utf-8"?>
<Car>
<carcost>
<ID>20130821133126</ID>
<uptime>60</uptime>
<downtime>30</downtime>
<price>0.4</price>
</carcost>
<carcost>
<ID>20130821014316</ID>
<uptime>120</uptime>
<downtime>60</downtime>
<price>0.3</price>
</carcost>
<carcost>
<ID>20130822043127</ID>
<uptime>30</uptime>
<downtime>0</downtime>
<price>0.5</price>
</carcost>
<carcost>
<ID>20130822043341</ID>
<uptime>120以上！</uptime>
<downtime>120</downtime>
<price>0.2</price>
</carcost>
</Car>在控制台应用程序中输入如下代码即可。
class Program
{
static void Main(string[] args)
{
IList<CarCost> resultList = new List<CarCost>();
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Load("test.xml");
XmlNodeList xmlNodeList = xmlDocument.SelectSingleNode("Car").ChildNodes;
foreach (XmlNode list in xmlNodeList)
{
CarCost carcost = new CarCost
(
list.SelectSingleNode("ID").InnerText,
list.SelectSingleNode("uptime").InnerText,
list.SelectSingleNode("downtime").InnerText,
float.Parse(list.SelectSingleNode("price").InnerText)
);
resultList.Add(carcost);
}
IEnumerator enumerator = resultList.GetEnumerator();
while (enumerator.MoveNext())
{
CarCost carCost = enumerator.Current as CarCost;
Console.WriteLine(carCost.ID + " " + carCost.UpTime + " " + carCost.DownTime + " " + carCost.Price);
}
}
}
public class CarCost
{
public CarCost(string id, string uptime, string downtime, float price)
{
this.ID = id;
this.UpTime = uptime;
this.DownTime = downtime;
this.Price = price;
}
public string ID { get; set; }
public string UpTime { get; set; }
public string DownTime { get; set; }
public float Price { get; set; }
}二、C#对JSON格式数据的解析
引用Newtonsoft.Json.dll文件，来解析。
比如：有个要解析的JSON字符串
[{"TaskRoleSpaces":"","TaskRoles":"","ProxyUserID":"5d9ad5dc1c5e494db1d1b4d8d79b60a7","UserID":"5d9ad5dc1c5e494db1d1b4d8d79b60a7","UserName":"姓名","UserSystemName":"2234","OperationName":"送合同负责人","OperationValue":"同意","OperationValueText":"","SignDate":"2013-06-19 10:31:26","Comment":"同意","FormDataHashCode":"","SignatureDivID":""},{"TaskRoleSpaces":"","TaskRoles":"","ProxyUserID":"2c96c3943826ea93013826eafe6d0089","UserID":"2c96c3943826ea93013826eafe6d0089","UserName":"姓名2","UserSystemName":"1234","OperationName":"送合同负责人","OperationValue":"同意","OperationValueText":"","SignDate":"2013-06-20 09:37:11","Comment":"同意","FormDataHashCode":"","SignatureDivID":""}]
首先定义个实体类：
public class JobInfo
{
public string TaskRoleSpaces { get; set; }
public string TaskRoles { get; set; }
public string ProxyUserID { get; set; }
public string UserID { get; set; }
public string UserName { get; set; }
public string UserSystemName { get; set; }
public string OperationName { get; set; }
public string OperationValue { get; set; }
public string OperationValueText { get; set; }
public DateTime SignDate { get; set; }
public string Comment { get; set; }
public string FormDataHashCode { get; set; }
public string SignatureDivID { get; set; }
}然后在控制台Main函数内部输入如下代码：
string json = @"[{'TaskRoleSpaces':'','TaskRoles':'','ProxyUserID':'5d9ad5dc1c5e494db1d1b4d8d79b60a7','UserID':'5d9ad5dc1c5e494db1d1b4d8d79b60a7','UserName':'姓名','UserSystemName':'2234','OperationName':'送合同负责人','OperationValue':'同意','OperationValueText':'','SignDate':'2013-06-19 10:31:26','Comment':'同意','FormDataHashCode':'','SignatureDivID':''},{'TaskRoleSpaces':'','TaskRoles':'','ProxyUserID':'2c96c3943826ea93013826eafe6d0089','UserID':'2c96c3943826ea93013826eafe6d0089','UserName':'姓名2','UserSystemName':'1234','OperationName':'送合同负责人','OperationValue':'同意','OperationValueText':'','SignDate':'2013-06-20 09:37:11','Comment':'同意','FormDataHashCode':'','SignatureDivID':''}]
";
List<JobInfo> jobInfoList = JsonConvert.DeserializeObject<List<JobInfo>>(json);
foreach (JobInfo jobInfo in jobInfoList)
{
Console.WriteLine("UserName:" + jobInfo.UserName + "UserID:" + jobInfo.UserID);
}这样就可以正常输出内容了。
我想肯定有人会问，如果有多层关系的json字符串该如何处理呢？没关系，一样的处理。
比如如何解析这个json字符串：[{'phantom':true,'id':'20130717001','data':{'MID':1019,'Name':'aaccccc','Des':'cc','Disable':'启用','Remark':'cccc'}}] ？
首先还是定义实体类：
public class Info
{
public string phantom { get; set; }
public string id { get; set; }
public data data { get; set; }
}
public class data
{
public int MID { get; set; }
public string Name { get; set; }
public string Des { get; set; }
public string Disable { get; set; }
public string Remark { get; set; }
}然后在main方法里面，键入：
string json = @"[{'phantom':true,'id':'20130717001','data':{'MID':1019,'Name':'aaccccc','Des':'cc','Disable':'启用','Remark':'cccc'}}]";
List<Info> infoList = JsonConvert.DeserializeObject<List<Info>>(json);
foreach (Info info in infoList)
{
Console.WriteLine("id:" + info.data.MID);
}按照我们的预期，应该能够得到1019的结果。
截图为证：
另外，对于有些json格式不是标准的，可以使用通用的方法进行解析。
string jsonText = @" {'Count':1543,'Items':[{'UnitID':6119,'UnitName':'C'}]}";
JsonReader reader = new JsonTextReader(new StringReader(jsonText));
while (reader.Read())
{
Console.WriteLine(reader.TokenType + "\t\t" + reader.ValueType + "\t\t" + reader.Value);
}附Newtonsoft.Json.dll下载地址：下载吧
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