公共(public)字符串 HttpCall(string NvpRequest) 方法中发生以下异常:
它发生在这行代码上
//Retrieve the Response returned from the NVP API call to PayPal.
HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
这是代码:
using System;
using System.Collections;
using System.Collections.Specialized;
using System.IO;
using System.Net;
using System.Text;
using System.Data;
using System.Configuration;
using System.Web;
using WingtipToys;
using WingtipToys.Models;
using System.Collections.Generic;
using System.Linq;
public class NVPAPICaller
{
//Flag that determines the PayPal environment (live or sandbox)
private const bool bSandbox = true;
private const string CVV2 = "CVV2";
// Live strings.
private string pEndPointURL = "https://api-3t.paypal.com/nvp";
private string host = "www.paypal.com";
// Sandbox strings.
private string pEndPointURL_SB = "https://api-3t.sandbox.paypal.com/nvp";
private string host_SB = "www.sandbox.paypal.com";
private const string SIGNATURE = "SIGNATURE";
private const string PWD = "PWD";
private const string ACCT = "ACCT";
//Replace <Your API Username> with your API Username
//Replace <Your API Password> with your API Password
//Replace <Your Signature> with your Signature
//
// 4/28/2016 Updated by Mike to test the Paypal API
// Commented out these three (3) lines below and add new credentials
//
//public string APIUsername = "<Your API Username>";
//private string APIPassword = "<Your API Password>";
//private string APISignature = "<Your Signature>";
public string APIUsername = "[email protected]";
private string APIPassword = "Testing123!";
private string APISignature = "MySignature";
private string Subject = "";
private string BNCode = "PP-ECWizard";
//HttpWebRequest Timeout specified in milliseconds
private const int Timeout = 15000;
private static readonly string[] SECURED_NVPS = new string[] { ACCT, CVV2, SIGNATURE, PWD };
public void SetCredentials(string Userid, string Pwd, string Signature)
{
APIUsername = Userid;
APIPassword = Pwd;
APISignature = Signature;
}
public bool ShortcutExpressCheckout(string amt, ref string token, ref string retMsg)
{
if (bSandbox)
{
pEndPointURL = pEndPointURL_SB;
host = host_SB;
}
string returnURL = "https://localhost:44300/Checkout/CheckoutReview.aspx";
string cancelURL = "https://localhost:44300/Checkout/CheckoutCancel.aspx";
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "SetExpressCheckout";
encoder["RETURNURL"] = returnURL;
encoder["CANCELURL"] = cancelURL;
encoder["BRANDNAME"] = "MyBrandNameDuringTesting";
encoder["PAYMENTREQUEST_0_AMT"] = amt;
encoder["PAYMENTREQUEST_0_ITEMAMT"] = amt;
encoder["PAYMENTREQUEST_0_PAYMENTACTION"] = "Sale";
encoder["PAYMENTREQUEST_0_CURRENCYCODE"] = "USD";
// Get the Shopping Cart Products
using (WingtipToys.Logic.ShoppingCartActions myCartOrders = new WingtipToys.Logic.ShoppingCartActions())
{
List<CartItem> myOrderList = myCartOrders.GetCartItems();
for (int i = 0; i < myOrderList.Count; i++)
{
encoder["L_PAYMENTREQUEST_0_NAME" + i] = myOrderList[i].Product.ProductName.ToString();
encoder["L_PAYMENTREQUEST_0_AMT" + i] = myOrderList[i].Product.UnitPrice.ToString();
encoder["L_PAYMENTREQUEST_0_QTY" + i] = myOrderList[i].Quantity.ToString();
}
}
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp);
NVPCodec decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" || strAck == "successwithwarning"))
{
token = decoder["TOKEN"];
string ECURL = "https://" + host + "/cgi-bin/webscr?cmd=_express-checkout" + "&token=" + token;
retMsg = ECURL;
return true;
}
else
{
retMsg = "ErrorCode=" + decoder["L_ERRORCODE0"] + "&" +
"Desc=" + decoder["L_SHORTMESSAGE0"] + "&" +
"Desc2=" + decoder["L_LONGMESSAGE0"];
return false;
}
}
public bool GetCheckoutDetails(string token, ref string PayerID, ref NVPCodec decoder, ref string retMsg)
{
if (bSandbox)
{
pEndPointURL = pEndPointURL_SB;
}
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "GetExpressCheckoutDetails";
encoder["TOKEN"] = token;
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp);
decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" || strAck == "successwithwarning"))
{
PayerID = decoder["PAYERID"];
return true;
}
else
{
retMsg = "ErrorCode=" + decoder["L_ERRORCODE0"] + "&" +
"Desc=" + decoder["L_SHORTMESSAGE0"] + "&" +
"Desc2=" + decoder["L_LONGMESSAGE0"];
return false;
}
}
public bool DoCheckoutPayment(string finalPaymentAmount, string token, string PayerID, ref NVPCodec decoder, ref string retMsg)
{
if (bSandbox)
{
pEndPointURL = pEndPointURL_SB;
}
NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "DoExpressCheckoutPayment";
encoder["TOKEN"] = token;
encoder["PAYERID"] = PayerID;
encoder["PAYMENTREQUEST_0_AMT"] = finalPaymentAmount;
encoder["PAYMENTREQUEST_0_CURRENCYCODE"] = "USD";
encoder["PAYMENTREQUEST_0_PAYMENTACTION"] = "Sale";
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp);
decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);
string strAck = decoder["ACK"].ToLower();
if (strAck != null && (strAck == "success" || strAck == "successwithwarning"))
{
return true;
}
else
{
retMsg = "ErrorCode=" + decoder["L_ERRORCODE0"] + "&" +
"Desc=" + decoder["L_SHORTMESSAGE0"] + "&" +
"Desc2=" + decoder["L_LONGMESSAGE0"];
return false;
}
}
public string HttpCall(string NvpRequest)
{
string url = pEndPointURL;
string strPost = NvpRequest + "&" + buildCredentialsNVPString();
strPost = strPost + "&BUTTONSOURCE=" + HttpUtility.UrlEncode(BNCode);
HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
objRequest.Timeout = Timeout;
objRequest.Method = "POST";
objRequest.ContentLength = strPost.Length;
try
{
using (StreamWriter myWriter = new StreamWriter(objRequest.GetRequestStream()))
{
myWriter.Write(strPost);
}
}
catch (Exception e)
{
// Log the exception.
WingtipToys.Logic.ExceptionUtility.LogException(e, "HttpCall in PayPalFunction.cs");
}
//Retrieve the Response returned from the NVP API call to PayPal.
HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
string result;
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
result = sr.ReadToEnd();
}
return result;
}
private string buildCredentialsNVPString()
{
NVPCodec codec = new NVPCodec();
if (!IsEmpty(APIUsername))
codec["USER"] = APIUsername;
if (!IsEmpty(APIPassword))
codec[PWD] = APIPassword;
if (!IsEmpty(APISignature))
codec[SIGNATURE] = APISignature;
if (!IsEmpty(Subject))
codec["SUBJECT"] = Subject;
codec["VERSION"] = "88.0";
return codec.Encode();
}
public static bool IsEmpty(string s)
{
return s == null || s.Trim() == string.Empty;
}
}
public sealed class NVPCodec : NameValueCollection
{
private const string AMPERSAND = "&";
private const string EQUALS = "=";
private static readonly char[] AMPERSAND_CHAR_ARRAY = AMPERSAND.ToCharArray();
private static readonly char[] EQUALS_CHAR_ARRAY = EQUALS.ToCharArray();
public string Encode()
{
StringBuilder sb = new StringBuilder();
bool firstPair = true;
foreach (string kv in AllKeys)
{
string name = HttpUtility.UrlEncode(kv);
string value = HttpUtility.UrlEncode(this[kv]);
if (!firstPair)
{
sb.Append(AMPERSAND);
}
sb.Append(name).Append(EQUALS).Append(value);
firstPair = false;
}
return sb.ToString();
}
public void Decode(string nvpstring)
{
Clear();
foreach (string nvp in nvpstring.Split(AMPERSAND_CHAR_ARRAY))
{
string[] tokens = nvp.Split(EQUALS_CHAR_ARRAY);
if (tokens.Length >= 2)
{
string name = HttpUtility.UrlDecode(tokens[0]);
string value = HttpUtility.UrlDecode(tokens[1]);
Add(name, value);
}
}
}
public void Add(string name, string value, int index)
{
this.Add(GetArrayName(index, name), value);
}
public void Remove(string arrayName, int index)
{
this.Remove(GetArrayName(index, arrayName));
}
public string this[string name, int index]
{
get
{
return this[GetArrayName(index, name)];
}
set
{
this[GetArrayName(index, name)] = value;
}
}
private static string GetArrayName(int index, string name)
{
if (index < 0)
{
throw new ArgumentOutOfRangeException("index", "index cannot be negative : " + index);
}
return name + index;
}
最佳答案
strPost.Length(字符串上的字符数)可以与用于存储字符串的字节数完全不同，因为编码。
为了确保正确的大小，首先获取字符串的二进制数组并将其用作大小并将其写入流:
public string HttpCall(string NvpRequest)
{
string url = pEndPointURL;
string strPost = NvpRequest + "&" + buildCredentialsNVPString();
strPost = strPost + "&BUTTONSOURCE=" + HttpUtility.UrlEncode(BNCode);
var byteStr = Encoding.UTF8.GetBytes(strPost);
HttpWebRequest objRequest = (HttpWebRequest)WebRequest.Create(url);
objRequest.Timeout = Timeout;
objRequest.Method = "POST";
objRequest.ContentLength = byteStr.Length;
try
{
using(var str = objRequest.GetRequestStream())
str.Write(byteStr, 0, byteStr.Length);
}
catch (Exception e)
{
// Log the exception.
WingtipToys.Logic.ExceptionUtility.LogException(e, "HttpCall in PayPalFunction.cs");
}
//Retrieve the Response returned from the NVP API call to PayPal.
HttpWebResponse objResponse = (HttpWebResponse)objRequest.GetResponse();
string result;
using (StreamReader sr = new StreamReader(objResponse.GetResponseStream()))
{
result = sr.ReadToEnd();
}
return result;
}
关于c# - 'System.Net.ProtocolViolationException' {"You must write ContentLength bytes to the request stream before calling [Begin]GetResponse."}，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36918570/