序列化json over wire

Question

在编码方面，以下哪种方法更好？

我写过三种方法，

Http POST请求

选项A - ASCII

let request = WebRequest.Create(url) :?> HttpWebRequest
request.Method <- "POST"
request.ContentType <- "application/json;charset=UTF-8"
use memoryStream = new MemoryStream() 
(new DataContractJsonSerializer(typeof<Article>)).WriteObject(memoryStream, schema) 

// option A
let str = Encoding.Default.GetString(memoryStream.ToArray()) // using ASCII
let data : byte[] = Text.Encoding.ASCII.GetBytes(str); 

request.ContentLength <- (int64)data.Length
use requestStream = request.GetRequestStream() 
requestStream.Write(data, 0, data.Length)
requestStream.Flush()
requestStream.Close()

选项B - UTF-8

let request = WebRequest.Create(url) :?> HttpWebRequest
request.Method <- "POST"
request.ContentType <- "application/json;charset=UTF-8"
use memoryStream = new MemoryStream() 
(new DataContractJsonSerializer(typeof<Article>)).WriteObject(memoryStream, schema) 

// option B
let s = Encoding.UTF8.GetString(memoryStream.ToArray()) // using UTF-8
let data : byte[] = Encoding.UTF8.GetBytes(d);

request.ContentLength <- (int64)data.Length
use requestStream = request.GetRequestStream() 
requestStream.Write(data, 0, data.Length)
requestStream.Flush()
requestStream.Close()

选项C-直接内存流

let request = WebRequest.Create(url) :?> HttpWebRequest
request.Method <- "POST"
request.ContentType <- "application/json;charset=UTF-8"
use memoryStream = new MemoryStream() 
(new DataContractJsonSerializer(typeof<Article>)).WriteObject(memoryStream, schema) 

// option C direct memory stream to array
let data : byte[] = memoryStream.ToArray() 

request.ContentLength <- (int64)data.Length
use requestStream = request.GetRequestStream() 
requestStream.Write(data, 0, data.Length)
requestStream.Flush()
requestStream.Close()