通过 C# 和 HttpClient 使用 Rest API

Question

我的代码曾经运行良好，这是

var verificationRequest2 = WebRequest.Create(AbstractPricing.PaypalWebAddress);
verificationRequest2.Method = "POST";
verificationRequest2.ContentType = "application/x-www-form-urlencoded";

var strRequest = "cmd=_notify-validate&" + ipnContext.RequestBody;
verificationRequest2.ContentLength = strRequest.Length;

using (var writer = new StreamWriter(verificationRequest2.GetRequestStream(), Encoding.ASCII))
{
    writer.Write(strRequest);
}

using (var reader = new StreamReader(verificationRequest2.GetResponse().GetResponseStream()))
{
    ipnContext.Verification = reader.ReadToEnd();
}

问题是，

WebClient

已过时，我需要将其转换为

HttpClient

我不确定如何将其转换为

HttpClient

...我已经尝试过

var verificationRequest = new HttpClient();
var content = new StringContent(strRequest, Encoding.UTF8, "text/xml");
var response= verificationRequest.PostAsync(AbstractPricing.PaypalWebAddress, content);
//help here please

我不知道最后一点该怎么做 - 如何使用

HttpClient

进行验证

Answer 1

您可以以与 Web 客户端相同的方式构建请求

class AbstractPricing {
  // Replace this with the actual PayPal web address
  public static string PaypalWebAddress {
    get;
  } = "https://www.example.com/paypal-endpoint";
}

class IpnContext {
  public string RequestBody {
    get;
    set;
  }
  public string Verification {
    get;
    set;
  }
}

// Actual code here, previous code just for testing
var paypalWebAddress = AbstractPricing.PaypalWebAddress;
var strRequest = "cmd=_notify-validate&" + ipnContext.RequestBody;

using(HttpClient httpClient = new HttpClient()) {
  // Set the Content-Type header
  httpClient.DefaultRequestHeaders.Add("Content-Type", "application/x-www-form-urlencoded");

  // Create the HTTP content
  var content = new StringContent(strRequest, Encoding.ASCII);

  // Make the POST request
  HttpResponseMessage response = await httpClient.PostAsync(paypalWebAddress, content);

  // Check if the request was successful
  if (response.IsSuccessStatusCode) {
    // Read the response content
    ipnContext.Verification = await response.Content.ReadAsStringAsync();
  } else {
    // Handle the error, e.g., log or throw an exception
    Console.WriteLine($"Error: {response.StatusCode} - {response.ReasonPhrase}");
  }
}