将对象序列化/反序列化到 XML 文件/从 XML 文件反序列化对象时出现问题
本文关键字:反序列化 文件 XML 对象 问题 序列化 | 更新日期: 2023-09-27 17:55:42
我必须首先将xml文件反序列化为列表,然后放大此列表并序列化所有内容,再添加1个对象(为此需要放大)
来自 XML 的代码:
<?xml version="1.0"?>
<Person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<name>Danie</name>
<lastName>McJackie</lastName>
<age>27</age>
</Person>
文件中的代码.cs:我评论了我在哪里收到错误并复制了错误消息
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
using System.IO;
using System.Xml.Serialization;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
private List<Person> Deserialize(string path)
{
using (FileStream fs = new FileStream(path, FileMode.Open))
{
XmlSerializer ser = new XmlSerializer(typeof(List<Person>));
return (List<Person>)ser.Deserialize(fs);
//There is an error in XML document (2, 2).
// I got this error and don't know how to manage with it.
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string path = Server.MapPath(Request.ApplicationPath + "/test.xml");
List<Person> people = File.Exists(path) ? Deserialize(path) :new List<Person>();
people.Add(new Person(TextBox1.Text, TextBox2.Text, int.Parse(TextBox3.Text)));
using (FileStream fs = File.OpenWrite(path))
{
XmlSerializer ser = new XmlSerializer(typeof(List<Person>));
ser.Serialize(fs, people);
}
}
}
并且至少要序列化的类:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
[Serializable]
public class Person
{
public string name;
public string lastName;
public int age;
public Person(string _name, string _lastName, int _age)
{
name = _name;
lastName = _lastName;
age = _age;
}
public Person()
{
}
}
异常详情:
System.InvalidOperationException was unhandled by user code
Message=There is an error in XML document (2, 2).
Source=System.Xml
StackTrace:
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)
at _Default.Deserialize(String path) in e:'Programy c#'WebSites'ASP8'Default.aspx.cs:line 22
at _Default.Button1_Click(Object sender, EventArgs e) in e:'Programy c#'WebSites'ASP8'Default.aspx.cs:line 29
at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
InnerException: System.InvalidOperationException
Message=<Person xmlns=''> was not expected.
Source=_1r-cm1p
StackTrace:
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read3_ArrayOfPerson()
InnerException:
这是我上次编辑添加的内容
反序列化文件.cs:
string path = Server.MapPath(Request.ApplicationPath + "/test.xml");
using (FileStream fs = new FileStream(path, FileMode.Open))
{
XmlSerializer ser = new XmlSerializer(typeof(List<Person>));
List<Person> os = (List<Person>)ser.Deserialize(fs);
foreach (var i in os)
{
Label1.Text += i.Name + "<hr />" + i.LastName + "<hr />" + i.Age.ToString() + "<hr />";
}
fs.Close();
一切正常,谢谢大家的帮助:)
而不是
XmlSerializer ser = new XmlSerializer(typeof(List<Person>));
尝试
XmlSerializer ser = new XmlSerializer(typeof(Person));
命名空间说明符中是否有行尾?
<?xml version="1.0"?>
<Person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://
www.w3.org/2001/XMLSchema">
应该是
<?xml version="1.0"?>
<Person xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
从问题中复制时,行尾似乎在那里