C# XML文件C中的序列化、反序列化、追加、获取、删除对象#
我有以下课程C# XML文件C中的序列化、反序列化、追加、获取、删除对象#,c#,xml,xml-serialization,C#,Xml,Xml Serialization,我有以下课程 [Serializable] public class Product { public Product() { } public string ProductID { get; set; } public string Name { get; set; } public string Description { get; set; } } 我想从对象创建一个XML文件。如果产品id存在,请以其他方式更新该节点,并在xml文件中添加或追加该节点 我
[Serializable]
public class Product
{
public Product() { }
public string ProductID { get; set; }
public string Name { get; set; }
public string Description { get; set; }
}
我想从对象创建一个XML文件。如果产品id存在,请以其他方式更新该节点,并在xml文件中添加或追加该节点
我正在使用以下代码序列化对象
public void SerializeNode(object obj, string filepath)
{
XmlSerializer serializer = new XmlSerializer(obj.GetType());
var writer = new StreamWriter(filepath);
serializer.Serialize(writer.BaseStream, obj);
}
但它每次都会从头开始创建文件,因此如果文件中存在数据,它会使用新的数据对其进行重载
所以我在寻找一种机制,它在xml中添加/追加节点,根据ProductID获取节点并删除节点
该类可以用更多的数据成员进行扩展,因此代码应该是动态的,这样我就不必在代码中指定子元素,我只希望它在类级别
希望有人能帮忙
我正在寻找的结构如下
<?xml version="1.0" encoding="utf-8"?>
<Products>
<Product ProductID="1">
<Name>Product Name</Name>
<Description>Product Description</Description>
</Product>
<Product ProductID="2">
<Name>Product Name</Name>
<Description>Product Description</Description>
</Product>
<Product ProductID="3">
<Name>Product Name</Name>
<Description>Product Description</Description>
</Product>
</Products>
品名
产品说明
品名
产品说明
品名
产品说明
我不明白这个问题:
应该让你从一个更好的方向开始;即使用XElement手动序列化
var elmtProducts = new XElement("Products");
foreach(var item in ProductsList)
{
var elmtProduct = new XElement("Product");
elmtProduct.Add(new XElement("Name", "Product Name"));
elmtProduct.Add(new XElement("Description", "Product Description"));
//if(
elmtProducts.Add(elmtProduct);
}
elmtProducts.Save(new FileStream("blah"));
现在,您应该能够解决如何反序列化这个问题。您也可以将整个内容加载回内存,使用新产品进行更新,然后重新保存。如果您有太多的产品无法做到这一点,那么您需要一个数据库,而不是XML 在这里,如果您不确定如何反序列化,可以执行以下操作:
internal class Program
{
private static void Main(string[] args)
{
//var products = new ProductCollection();
//products.Add(new Product { ID = 1, Name = "Product1", Description = "This is product 1" });
//products.Add(new Product { ID = 2, Name = "Product2", Description = "This is product 2" });
//products.Add(new Product { ID = 3, Name = "Product3", Description = "This is product 3" });
//products.Save("C:\\Test.xml");
var products = ProductCollection.Load("C:\\Test.xml");
Console.ReadLine();
}
}
[XmlRoot("Products")]
public class ProductCollection : List<Product>
{
public static ProductCollection Load(string fileName)
{
return new FileInfo(fileName).XmlDeserialize<ProductCollection>();
}
public void Save(string fileName)
{
this.XmlSerialize(fileName);
}
}
public class Product
{
[XmlAttribute("ProductID")]
public int ID { get; set; }
public string Name { get; set; }
public string Description { get; set; }
}
我希望这是有用的。如果没有,请按要求向我们提供有关您的情况的更多信息。这不仅仅是一个对象,在同一个对象中可以有多个对象file@AdnanZameer,我想他指的是根对象。。只需将整个文件反序列化为一个Products对象,进行更改并将其保存回文件。也许OP可以告诉我们为什么这不是所采取的方法。@AdnanZameer:哦,我知道你是OP。噢。哈哈。那么,也许你可以告诉我们。。为什么不反序列化整个对象?你对文件太大有什么问题吗?如果你能提供更多的细节,我们也许能想出更好的办法solutions@AdnanZameer是对象的数组/列表吗?我也得不到:创建一个容器对象,其属性是对象列表使用IRepository模式;
public static class XmlExtensions
{
/// <summary>
/// Deserializes the XML data contained by the specified System.String
/// </summary>
/// <typeparam name="T">The type of System.Object to be deserialized</typeparam>
/// <param name="s">The System.String containing XML data</param>
/// <returns>The System.Object being deserialized.</returns>
public static T XmlDeserialize<T>(this string s)
{
if (string.IsNullOrEmpty(s))
{
return default(T);
}
var locker = new object();
var stringReader = new StringReader(s);
var reader = new XmlTextReader(stringReader);
try
{
var xmlSerializer = new XmlSerializer(typeof(T));
lock (locker)
{
var item = (T)xmlSerializer.Deserialize(reader);
reader.Close();
return item;
}
}
catch
{
return default(T);
}
finally
{
reader.Close();
}
}
/// <summary>
/// Deserializes the XML data contained in the specified file.
/// </summary>
/// <typeparam name="T">The type of System.Object to be deserialized.</typeparam>
/// <param name="fileInfo">This System.IO.FileInfo instance.</param>
/// <returns>The System.Object being deserialized.</returns>
public static T XmlDeserialize<T>(this FileInfo fileInfo)
{
string xml = string.Empty;
using (FileStream fs = new FileStream(fileInfo.FullName, FileMode.Open, FileAccess.Read))
{
using (StreamReader sr = new StreamReader(fs))
{
return sr.ReadToEnd().XmlDeserialize<T>();
}
}
}
/// <summary>
/// <para>Serializes the specified System.Object and writes the XML document</para>
/// <para>to the specified file.</para>
/// </summary>
/// <typeparam name="T">This item's type</typeparam>
/// <param name="item">This item</param>
/// <param name="fileName">The file to which you want to write.</param>
/// <returns>true if successful, otherwise false.</returns>
public static bool XmlSerialize<T>(this T item, string fileName)
{
return item.XmlSerialize(fileName, true);
}
/// <summary>
/// <para>Serializes the specified System.Object and writes the XML document</para>
/// <para>to the specified file.</para>
/// </summary>
/// <typeparam name="T">This item's type</typeparam>
/// <param name="item">This item</param>
/// <param name="fileName">The file to which you want to write.</param>
/// <param name="removeNamespaces">
/// <para>Specify whether to remove xml namespaces.</para>para>
/// <para>If your object has any XmlInclude attributes, then set this to false</para>
/// </param>
/// <returns>true if successful, otherwise false.</returns>
public static bool XmlSerialize<T>(this T item, string fileName, bool removeNamespaces)
{
object locker = new object();
XmlSerializerNamespaces xmlns = new XmlSerializerNamespaces();
xmlns.Add(string.Empty, string.Empty);
XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
settings.OmitXmlDeclaration = true;
lock (locker)
{
using (XmlWriter writer = XmlWriter.Create(fileName, settings))
{
if (removeNamespaces)
{
xmlSerializer.Serialize(writer, item, xmlns);
}
else { xmlSerializer.Serialize(writer, item); }
writer.Close();
}
}
return true;
}
}