虽然标准做法是实现ICloneable接口（在此进行描述，所以我不会反驳），但这是我之前在The Code Project上发现的一个不错的深克隆对象复印机，并将其合并到我们的资料中。
如在其他地方提到的，它确实要求您的对象可序列化。
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
/// <summary>
/// Reference Article http://www.codeproject.com/KB/tips/SerializedObjectCloner.aspx
/// Provides a method for performing a deep copy of an object.
/// Binary Serialization is used to perform the copy.
/// </summary>
public static class ObjectCopier
{
/// <summary>
/// Perform a deep Copy of the object.
/// </summary>
/// <typeparam name="T">The type of object being copied.</typeparam>
/// <param name="source">The object instance to copy.</param>
/// <returns>The copied object.</returns>
public static T Clone<T>(T source)
{
if (!typeof(T).IsSerializable)
{
throw new ArgumentException("The type must be serializable.", nameof(source));
}
// Don't serialize a null object, simply return the default for that object
if (Object.ReferenceEquals(source, null))
{
return default(T);
}
IFormatter formatter = new BinaryFormatter();
Stream stream = new MemoryStream();
using (stream)
{
formatter.Serialize(stream, source);
stream.Seek(0, SeekOrigin.Begin);
return (T)formatter.Deserialize(stream);
}
}
}
这个想法是先序列化您的对象，然后反序列化为一个新的对象。这样做的好处是，当对象变得太复杂时，您不必担心克隆所有内容。
并使用扩展方法（也来自最初引用的源）：
如果您更喜欢使用C＃3.0 的新扩展方法，请将方法更改为具有以下签名：
public static T Clone<T>(this T source)
{
//...
}
现在，方法调用简单地变为objectBeingCloned.Clone();。
（2015年1月10日）以为我会重新审视此事，我最近提到开始使用（Newtonsoft）Json来做到这一点，它应该更轻巧，并且避免了[Serializable]标签的开销。（ @atconway在注释中指出，不使用JSON方法克隆私有成员）
/// <summary>
/// Perform a deep Copy of the object, using Json as a serialisation method. NOTE: Private members are not cloned using this method.
/// </summary>
/// <typeparam name="T">The type of object being copied.</typeparam>
/// <param name="source">The object instance to copy.</param>
/// <returns>The copied object.</returns>
public static T CloneJson<T>(this T source)
{
// Don't serialize a null object, simply return the default for that object
if (Object.ReferenceEquals(source, null))
{
return default(T);
}
// initialize inner objects individually
// for example in default constructor some list property initialized with some values,
// but in 'source' these items are cleaned -
// without ObjectCreationHandling.Replace default constructor values will be added to result
var deserializeSettings = new JsonSerializerSettings {ObjectCreationHandling = ObjectCreationHandling.Replace};
return JsonConvert.DeserializeObject<T>(JsonConvert.SerializeObject(source), deserializeSettings);
}
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