net自带二进制序列化，XML序列化和ProtoBuf序列化的压缩对比

测试结果：
ProtoBuf Length:115
BinaryFormatter Length:1177
XmlSerializer Length:814
xml length:825
做了一个各种序列化方案的压缩比例测试，可以看到protobuf序列化后的大小是xml原始格式的8分之一，是xml序列化后的8分之一，是二进制序列化的10分之一，总体看来ProtoBuf的优势还是很明显的,不过ProtoBuf.net不是google官方提供的，也许和其它平台不兼容，但如果做.NET服务端应用，两边都是.NET，还是可以适用的，即使有一边不是.NET，反正是开源的东西，协议也有，也可以自己实现相应语言的兼容ProtoBuf.net的协议栈。
SOAPFormatter没有测试，一般用的不多。还有就是怪事了，为什么二进制序列化反而大呢，奇怪了。
本次测试主要考虑协议的压缩率的比较，不考虑序列化/解序列化的速度，官方声明比XML解析要快几十倍，有空看下它的实现代码，我的SVN老下载不下来code.google的代码，汗了。

测试代码如下

internal class Program
{
    private static void Main(string[] args)
    {
        MemoryStream ms = null;
        Customer customer = Customer.GetOneCustomer();

        using (ms = new MemoryStream())
        {
            Serializer.Serialize(ms, customer);
            Console.WriteLine("ProtoBuf Length:{0}", ms.Length);
        }
        using (ms = new MemoryStream())
        {
            var formater = new BinaryFormatter();
            formater.Serialize(ms, customer);
            Console.WriteLine("BinaryFormatter Length:{0}", ms.Length);
        }
        using (ms = new MemoryStream())
        {
            var serializer = new XmlSerializer(typeof (Customer));
            serializer.Serialize(ms, customer);
            Console.WriteLine("XmlSerializer Length:{0}", ms.Length);
        }

        string xml =
            @"<?xml version=""1.0"" ?>
　<Customer xmlns=""urn:Sep2003Example"">
<CustomerID>ALFKI</CustomerID>
<PO>9572658</PO>
<Address>
    <Street>One Main Street</Street>
    <City>Anywhere</City>
    <State>NJ</State>
    <Zip>08080</Zip>
</Address>
<Order>
    <OrderID>10966</OrderID >
    <LineItem>
        <ProductID>37</ProductID>
        <UnitPrice>26.50 </UnitPrice>
        <Quantity>8</Quantity>
        <Description>Gravad lax </Description>            　
    </LineItem>
    <LineItem>
        <ProductID>56 </ProductID>
        <UnitPrice>38.00</UnitPrice>
        <Quantity>12</Quantity>
        <Description>Gnocchi di nonna Alice</Description>            　
    </LineItem>
</Order>    　
</Customer>";
        Console.WriteLine("xml length:{0}", Encoding.UTF8.GetByteCount(xml));
        Console.ReadKey();
    }
}

相关数据结构如下 

[ProtoContract]
[Serializable]
public class Customer {
    [ProtoMember(1)]
    public string CustomerID { get; set; }
    [ProtoMember(2)]
    public int PO { get; set; }
    [ProtoMember(3)]
    public Address Address { get; set; }
    [ProtoMember(4)]
    public Order Order { get; set; }

    public static Customer GetOneCustomer() {
        Customer customer = new Customer {
            CustomerID = "ALFKI",
            PO = 9572658,
            Address = new Address {
                Street = "One Main Street",
                City = "Anywhere",
                State = "NJ",
                Zip = 08080
            },
            Order = new Order {
                OrderID = 10966,
                LineItems = new List<LineItem>
                    {
                        new LineItem
                            {
                                ProductID = 37,
                                UnitPrice = 26.50M,
                                Quantity =8,
                                Description ="Gravad lax"
                            },
                        new LineItem
                            {
                                ProductID = 56,
                                UnitPrice = 38.00M,
                                Quantity =12,
                                Description ="Gnocchi di nonna Alice"    
                            }
                    }
            }
        };
        return customer;
    }
}

[ProtoContract]
[Serializable]
public class Address {
    [ProtoMember(1)]
    public string Street { get; set; }
    [ProtoMember(2)]
    public string City { get; set; }
    [ProtoMember(3)]
    public string State { get; set; }
    [ProtoMember(4)]
    public int Zip { get; set; }
}

[ProtoContract]
[Serializable]
public class Order {
    [ProtoMember(1)]
    public int OrderID { get; set; }
    [ProtoMember(2)]
    public List<LineItem> LineItems { get; set; }
}

[ProtoContract]
[Serializable]
public class LineItem {
    [ProtoMember(1)]
    public int ProductID { get; set; }
    [ProtoMember(2)]
    public decimal UnitPrice { get; set; }
    [ProtoMember(3)]
    public int Quantity { get; set; }
    [ProtoMember(4)]
    public string Description { get; set; }
}

相关链接
Protocol Buffers 性能测试
http://hellobmw.com/archives/protocol-buffers-performance.html
Windows Communication Protocols (MCPP)
http://msdn.microsoft.com/en-us/library/cc216513(PROT.10).aspx
浅谈如何使用.NET存储XML数据
http://developer.51cto.com/art/200905/122238.htm
.net下二进制序列化的格式分析[转]
http://www.cnblogs.com/lxinxuan/archive/2006/09/06/496340.html
Protocol Buffers Encoding
http://code.google.com/intl/zh-CN/apis/protocolbuffers/docs/encoding.html