Question

我必须与第三方API集成。要使用该服务，我必须“POST”到具有某些参数的特定URL。

该服务提供的示例代码在php中，如下所示

$data = array('From' => '0999999', 'To' => '08888888'); 
$curl = curl_init();
curl_setopt($curl, CURLOPT_FAILONERROR, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);  <--- Ignore SSL warnings
curl_setopt($curl, CURLOPT_POST, true); 
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);

我正在尝试使用WebRequest类在.net中实现相同的功能。但是，我对如何设置post参数数据感到有点困惑。我认为上面的$ data只不过是一本词典。所以我创建了一个等效的字典。但是，如何使用字典值设置post参数？

在http://msdn.microsoft.com/en-us/library/debx8sh9.aspx中，他们将字符串序列化为字节数组，然后将其设置为dataStream中的post参数。我如何为字典做同样的事情？

或者我的方法不正确？有更好的方法吗？

Answer 1

一般来说，WebClient.UploadValues将是最简单的方法; see MSDN for a full example。但请注意，这仅涵盖CURLOPT_POSTFIELDS和CURLOPT_POST。错误失败是自动和隐含的，并且响应已包含为byte[]。

即

using(var client = new WebClient()) {
    var data = new NameValueCollection();
    data.Add("From", "0999999");
    data.Add("To", "08888888");
    var result = client.UploadValues(url, data);
}

注意POST隐含在这里;如果您需要不同的http方法，请使用重载：

var result = client.UploadValues(url, "PUT", data); // for example

Answer 2

如果您使用网址编码的帖子数据，则可以使用HttpServerUtility.UrlEncode Method (String)

对网址的每个键/值对进行网址编码

// Build postData
StringBuilder post = new StringBuilder();
foreach(item in dictionary) {
  post.AppendFormat("&{0}={1}", item.key, HttpUtility.UrlEncode(item.value));
}
string postData = post.ToString();

// HTTP POST
Uri uri = new Uri(url);
request = (HttpWebRequest) WebRequest.Create(uri);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = postData.Length;
using(Stream writeStream = request.GetRequestStream())
{
  UTF8Encoding encoding = new UTF8Encoding();
  byte[] bytes = encoding.GetBytes(postData);
  writeStream.Write(bytes, 0, bytes.Length);
}

Answer 3

Just in case you have to use HttpWebRequest, the code below converts a Dictionary<String,String> named formVars to a byte[] named toPost:

byte[] toPost = System.Text.Encoding.UTF8.GetBytes(
    String.Join("&", formVars.Select(x =>
        HttpUtility.UrlEncode(x.Key) + "=" +
        HttpUtility.UrlEncode(x.Value)));
);

Play with a working copy at https://dotnetfiddle.net/IOzIE6

Answer 4

您可能想要使用

http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx

HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("http://url");
request.AllowWriteStreamBuffering = true;
request.Method = "POST";
string post = "From=0999999&To=08888888";
request.ContentLength = post.Length;
request.ContentType = "application/x-www-form-urlencoded";

StreamWriter writer = new StreamWriter(request.GetRequestStream());
writer.Write(post);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

在.net中设置post参数的等效方法是什么？

4 个答案: