測試結果：
ProtoBuf Length:115
BinaryFormatter Length:1177
XmlSerializer Length:814
xml length:825
做了一個各種序列化方案的壓縮比例測試，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，是二進制序列化的10分之一，總體看來ProtoBuf的優勢還是很明顯的,不過ProtoBuf.net不是google官方提供的，也許和其它平臺不兼容，但如果做.NET服務端應用，兩邊都是.NET，還是可以適用的，即使有一邊不是.NET，反正是開源的東西，協議也有，也可以自己實現相應語言的兼容ProtoBuf.net的協議棧。
SOAPFormatter沒有測試，一般用的不多。還有就是怪事了，為什么二進制序列化反而大呢，奇怪了。
本次測試主要考慮協議的壓縮率的比較，不考慮序列化/解序列化的速度，官方聲明比XML解析要快幾十倍，有空看下它的實現代碼，我的SVN老下載不下來code.google的代碼，汗了。

測試代碼如下

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();
????}
}

相關數據結構如下?

?

[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;?}
}

相關鏈接
Protocol Buffers 性能測試
http://hellobmw.com/archives/protocol-buffers-performance.html
Windows Communication Protocols (MCPP)
http://msdn.microsoft.com/en-us/library/cc216513(PROT.10).aspx
淺談如何使用.NET存儲XML數據
http://developer.51cto.com/art/200905/122238.htm
.net下二進制序列化的格式分析[轉]
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

總結

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