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Dim StringA,stringSignTemp,sign As String

'stringA ="appid=wxa7154bc4751eddec&body=test&device_info=1000&mch_id=1488726912&nonce_str=ibuaiVcKdpRxkhJA"

' stringSignTemp = stringA + "&key=hahaqwertyuioasdfghjklzxcvblanbo"

Dim attach_my,body,getMCHID,notify_url,openid,out_trade_no,create_ip,getPartnerKey As String

Dim st As New Date(1970,1,1,8,0,0)

Dim getAppId As String = "wxa7154bc4751eddec" '开发者ID

Dim timestamp As Integer = CInt((Date.Now - st).TotalSeconds()) '时间戳

Dim total_fee

attach_my ="支付测试"

body = "test"

getMCHID ="1488726912"

Dim nonce_str As String = Rand.NextString(16) '随机字符

notify_url ="http://www.664748.top/hello.htm"

openid = "ofRouwl_aRCGFTkhxeVECkQmzd8g"

out_trade_no ="1415659990"

create_ip="106.14.79.51"

total_fee =1

getPartnerKey = "hahaqwertyuioasdfghjklzxcvblanbo"

sign="appid=" & getAppId & "&attach=" & attach_my & "&body=" & body & "&mch_id=" & getMCHID & "&n&notify_url=" & notify_url & "&openid=" & openid & "&out_trade_no=" & out_trade_no & "&spbill_create_ip=" & create_ip & "&total_fee=" & total_fee & "&trade_type=JSAPI&key=" & getPartnerKey

Output.Show(sign)

Dim md5 = System.Security.Cryptography.MD5.Create()

Dim bs = md5.ComputeHash(Encoding.UTF8.GetBytes(sign))

Dim sb As new StringBuilder()

For Each b As Byte In bs

sb.Append(b.ToString("x2"))

sign = sb.ToString().ToUpper()

msgbox(sign)

'sign = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sign, "MD5")

Dim xml As String

Dim xo As New XObject

xo.AddCDATA("appid",getAppId)

xo.AddCDATA("attach",attach_my)

xo.AddCDATA("body",body)

xo.AddCDATA("mch_id",getMCHID )

xo.AddCDATA("nonce_str",nonce_str)

xo.AddCDATA("notify_url",notify_url)

xo.AddCDATA("openid",openid)

xo.AddCDATA("out_trade_no",out_trade_no)

xo.AddCDATA("spbill_create_ip",create_ip)

xo.AddCDATA("total_fee",total_fee)

xo.AddCDATA("trade_type","JSAPI")

xo.AddCDATA("sign",sign)

'Dim hc As New HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder")

'hc.FormData.Add("xml",xo.ToXML)

'hc.C

'hc.Content = xo.ToXML

'MessageBox.Show(hc.getdata)

Dim hc As New HttpClient("https://api.mch.weixin.qq.com/pay/unifiedorder")

hc.Content = xo.ToXML

MessageBox.Show(hc.getdata)

主题：post xml 数据该怎么写