[CommunityServer]Serializer序列化类
好久没有写博客了,今天终于有点时间来继续写写东西,今天我们来看一下Serializer序列化类,在CommunityServer中这个实例的存储方法很值得我们学习,在加入属性是在数据库中就不需要添加字段名。能够实现这种功能的做法就是通过序列化和反序列化来完成这项功能,将属性序列化为XML格式的文本存储与数据库中的一个NText字段中。
好久没有写博客了,今天终于有点时间来继续写写东西,今天我们来看一下Serializer序列化类,在CommunityServer中这个实例的存储方法很值得我们学习,在加入属性是在数据库中就不需要添加字段名。能够实现这种功能的做法就是通过序列化和反序列化来完成这项功能,将属性序列化为XML格式的文本存储与数据库中的一个NText字段中。
我们来看看这个类的代码,上面有我的注释,获取有些地方说得不正确,那也没办法啦!
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序列化
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/**//// <summary>
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/// 序列化类。
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/// </summary>
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public class Serializer
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{
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//防止被实例化。
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private Serializer()
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{
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}
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/**//// <summary>
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/// 静态构造函数仅在设置CanBinarySerialize值中使用一次。
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/// </summary>
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static Serializer()
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{
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SecurityPermission sp = new SecurityPermission(SecurityPermissionFlag.SerializationFormatter);
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try
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{
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sp.Demand();
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CanBinarySerialize = true;
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}
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catch (SecurityException)
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{
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CanBinarySerialize = false;
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}
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}
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/**//// <summary>
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/// 获取二进制序列化是否被使用。
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/// </summary>
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public static readonly bool CanBinarySerialize;
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/**//// <summary>
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/// 将对象转化成二进制的数组。
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/// </summary>
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/// <param name="objectToConvert">用于转化的对象。</param>
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/// <returns>返回转化后的数组,如果CanBinarySerialize为false则返回null。</returns>
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public static byte[] ConvertToBytes(object objectToConvert)
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{
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byte[] byteArray = null;
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if (CanBinarySerialize)
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{
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BinaryFormatter binaryFormatter = new BinaryFormatter();
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using (MemoryStream ms = new MemoryStream())
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{
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binaryFormatter.Serialize(ms, objectToConvert);
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//设置是内存存储位置为0。
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ms.Position = 0;
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//读取数组。
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byteArray = new Byte[ms.Length];
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ms.Read(byteArray, 0, byteArray.Length);
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ms.Close();
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}
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}
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return byteArray;
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}
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/**//// <summary>
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/// 将对象以二进制形式存储到硬盘中。
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/// </summary>
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/// <param name="objectToSave">用于保存的对象。</param>
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/// <param name="path">文件路径。</param>
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/// <returns>如果存储成功则返回true,否则返回false。</returns>
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public static bool SaveAsBinary(object objectToSave, string path)
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{
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if (objectToSave != null && CanBinarySerialize)
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{
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byte[] ba = ConvertToBytes(objectToSave);
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if (ba != null)
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{
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using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
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{
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using (BinaryWriter bw = new BinaryWriter(fs))
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{
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bw.Write(ba);
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return true;
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}
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}
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}
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}
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return false;
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}
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/**//// <summary>
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///将对象转化为XML格式文件,该对象必须用[Serialize]标记,否则将抛出错误。
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/// </summary>
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/// <param name="objectToConvert">用于序列化的标记。</param>
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/// <returns>返回XML文本,如果对象为空则返回null。</returns>
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public static string ConvertToString(object objectToConvert)
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{
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string xml = null;
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if (objectToConvert != null)
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{
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//获取当前序列化对象。
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Type t = objectToConvert.GetType();
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XmlSerializer ser = new XmlSerializer(t);
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//将序列化的结果保存到XML中。
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using (StringWriter writer = new StringWriter(CultureInfo.InvariantCulture))
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{
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ser.Serialize(writer, objectToConvert);
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xml = writer.ToString();
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writer.Close();
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}
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}
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return xml;
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}
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/**//// <summary>
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/// 将对象序列化后以XML格式存储于文件中。
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/// </summary>
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/// <param name="objectToConvert">用于序列化的对象。</param>
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/// <param name="path">用于存储的文件路径。</param>
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public static void SaveAsXML(object objectToConvert, string path)
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{
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if (objectToConvert != null)
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{
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Type t = objectToConvert.GetType();
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XmlSerializer ser = new XmlSerializer(t);
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using (StreamWriter writer = new StreamWriter(path))
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{
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ser.Serialize(writer, objectToConvert);
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writer.Close();
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}
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}
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}
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/**//// <summary>
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/// 将一个二进制的数组转化为对象,必须通过类型转化自己想得到的相应对象。如果数组为空则返回空。
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/// </summary>
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/// <param name="byteArray">用于转化的二进制数组。</param>
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/// <returns>返回转化后的对象实例,如果数组为空,则返回空对象。</returns>
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public static object ConvertToObject(byte[] byteArray)
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{
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object convertedObject = null;
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if (CanBinarySerialize && byteArray != null && byteArray.Length > 0)
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{
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BinaryFormatter binaryFormatter = new BinaryFormatter();
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using (MemoryStream ms = new MemoryStream())
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{
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ms.Write(byteArray, 0, byteArray.Length);
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ms.Position = 0;
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if (byteArray.Length > 4)
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convertedObject = binaryFormatter.Deserialize(ms);
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ms.Close();
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}
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}
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return convertedObject;
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}
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/**//// <summary>
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/// 将文件的数据转化为对象。
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/// </summary>
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/// <param name="path">文件路径。</param>
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/// <param name="objectType">希望得到的对象。</param>
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/// <returns>返回反序列化的对象。</returns>
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public static object ConvertFileToObject(string path, Type objectType)
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{
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object convertedObject = null;
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if (path != null && path.Length > 0)
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{
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using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
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{
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XmlSerializer ser = new XmlSerializer(objectType);
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convertedObject = ser.Deserialize(fs);
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fs.Close();
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}
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}
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return convertedObject;
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}
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/**//// <summary>
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/// 将XML格式的字符串反序列化为实例对象。
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/// </summary>
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/// <param name="xml">Xml格式字符串。</param>
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/// <param name="objectType">反序列化后所期望的对象。</param>
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/// <returns>反序列化后所期望的对象,如果字符串为空,则返回空对象。</returns>
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public static object ConvertToObject(string xml, Type objectType)
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{
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object convertedObject = null;
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if (!WebHelper.IsNullOrEmpty(xml))
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{
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using (StringReader reader = new StringReader(xml))
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{
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XmlSerializer ser = new XmlSerializer(objectType);
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convertedObject = ser.Deserialize(reader);
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reader.Close();
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}
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}
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return convertedObject;
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}
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/**//// <summary>
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/// 将XML节点反序列化为实例对象。
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/// </summary>
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/// <param name="xml">用于反序列化的XML节点。</param>
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/// <param name="objectType">反序列化后所期望的对象。</param>
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/// <returns>反序列化后所期望的对象,如果字符串为空,则返回空对象。</returns>
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public static object ConvertToObject(XmlNode node, Type objectType)
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{
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object convertedObject = null;
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if (node != null)
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{
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using (StringReader reader = new StringReader(node.OuterXml))
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{
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XmlSerializer ser = new XmlSerializer(objectType);
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convertedObject = ser.Deserialize(reader);
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reader.Close();
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}
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}
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return convertedObject;
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}
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/**//// <summary>
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/// 加载一个二进制文件并将其转化为实例对象。
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/// </summary>
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/// <param name="path">文件路径。</param>
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/// <returns>返回转化后的实例对象。</returns>
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public static object LoadBinaryFile(string path)
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{
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if (!File.Exists(path))
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return null;
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using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
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{
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BinaryReader br = new BinaryReader(fs);
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byte[] ba = new byte[fs.Length];
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br.Read(ba, 0, (int)fs.Length);
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return ConvertToObject(ba);
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}
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}
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/**//// <summary>
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/// 将字符串序列化<see cref="System.Collections.Specialized.NameValueCollection"/>类型,第一个为键,第二位与其相对应的值。
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/// </summary>
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/// <param name="keys">NameValueCollection中的keys键。</param>
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/// <param name="values">NameValueCollection中的keys键对应的value。</param>
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/// <returns>基于key-value格式的NameValeCollection集合对象。</returns>
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/// <example>
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/// string keys = "key1:S:0:3:key2:S:3:2:";
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/// string values = "12345";
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/// 则这个所得的NameValueCollection结果中包含两个键(key1和key2),他们所对应的值分别为(123和45)。
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/// 其中:"key1:S:0:3"的key1表示键,S表示字符类型,0表示values起始的位置,3表示values结束的位置。
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/// </example>
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public static NameValueCollection ConvertToNameValueCollection(string keys, string values)
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{
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NameValueCollection nvc = new NameValueCollection();
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if (keys != null && values != null && keys.Length > 0 && values.Length > 0)
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{
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char[] splitter = new char[1]
{ ':' };
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string[] keyNames = keys.Split(splitter);
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for (int i = 0; i < (keyNames.Length / 4); i++)
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{
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int start = int.Parse(keyNames[(i * 4) + 2], CultureInfo.InvariantCulture);
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int len = int.Parse(keyNames[(i * 4) + 3], CultureInfo.InvariantCulture);
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string key = keyNames[i * 4];
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//Future version will support more complex types
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if (((keyNames[(i * 4) + 1] == "S") && (start >= 0)) && (len > 0) && (values.Length >= (start + len)))
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{
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nvc[key] = values.Substring(start, len);
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}
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}
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}
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return nvc;
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}
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/**//// <summary>
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/// 基于NameValueCollection对象序列化成keys和values的字符串。
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/// </summary>
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/// <param name="nvc">用于序列化的NameValueCollection对象。</param>
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/// <param name="keys">ref格式的参数keys将转化为NameValueCollection中的key。</param>
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/// <param name="values">ref格式的参数values将转化为NameValueCollection中的value。</param>
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public static void ConvertFromNameValueCollection(NameValueCollection nvc, ref string keys, ref string values)
282![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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if (nvc == null || nvc.Count == 0)
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return;
285![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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StringBuilder sbKey = new StringBuilder();
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StringBuilder sbValue = new StringBuilder();
288![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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int index = 0;
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foreach (string key in nvc.AllKeys)
291![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
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if (key.IndexOf(':') != -1)
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throw new ArgumentException("ExtendedAttributes Key can not contain the character \":\"");
294![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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string v = nvc[key];
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if (!WebHelper.IsNullOrEmpty(v))
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{
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sbKey.AppendFormat("{0}:S:{1}:{2}:", key, index, v.Length);
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sbValue.Append(v);
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index += v.Length;
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}
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}
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keys = sbKey.ToString();
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values = sbValue.ToString();
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}
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}
在SiteSettings.cs中可以发现有些属性加有[XmlIgnore]标记,这是在序列化和反序列化时对该属性都不起作用,如SettingsID等在数据库中都已经存在字段名。从代码中我们可以看到,将一个NameValueCollection集合序列化和反序列化,其实键和值对存储在一个结构中,这个结构就是:
其他的源代码都有解释了,应该能搞懂里面的东西!
我们来看看这个类的代码,上面有我的注释,获取有些地方说得不正确,那也没办法啦!
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在SiteSettings.cs中可以发现有些属性加有[XmlIgnore]标记,这是在序列化和反序列化时对该属性都不起作用,如SettingsID等在数据库中都已经存在字段名。从代码中我们可以看到,将一个NameValueCollection集合序列化和反序列化,其实键和值对存储在一个结构中,这个结构就是:
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public struct SerializerData
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{
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/**//// <summary>
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/// 序列化NameValueCollection集合时用于保存Keys的字符串。
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/// </summary>
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public string Keys;
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/**//// <summary>
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/// 序列化NameValueCollection集合时用于保存Values的字符串。
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/// </summary>
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public string Values;
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}
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其他的源代码都有解释了,应该能搞懂里面的东西!