我如何从UploadStringTaskAsync调用中检索传递的数据

Question

我有以下的webclient：

using (WebClient wc = new WebClient())
   {

 var url = currentURL+ "home/scanserver";
 wc.Headers.Add("Authorization", token);
 var json =wc.UploadStringTaskAsync(url, "FQDN=allscan");
   }

现在，我正在传递安全令牌和名为FQDN的数据。 所以在接收者的Post action方法上，我无法检索FQDN参数，

我尝试了以下但没有用

string FQDN = Request.Form["FQDN"];

我也尝试在动作方法参数内定义FQDN，如下所示：- public async Task<ActionResult> ScanServer(string FQDN)

Answer 1

如果FQDN是query parameter尝试

using (WebClient wc = new WebClient())
{
  var url = currentURL+ "home/scanserver?FQDN=allscan";
  wc.Headers.Add("Authorization", token);
  var json =wc.UploadStringTaskAsync(url, "");
}

编辑

要将其发布为表单，请使用UploadValuesTaskAsync方法。

var url = currentURL+ "home/scanserver";
var args = new NameValueCollection { { "FQDN", "allscan" } };
var json = wc.UploadValuesTaskAsync(url, args);

json现在是一个Task<byte>而不是Task<string> ，因此您必须将其转换为string ； 就像是

var s = Encoding.Utf8.GetString(json.Result);

Answer 2

对于简单的查询参数，您可以按照@Richard所说的进行

using (WebClient wc = new WebClient())
{
    var url = currentURL+ "home/scanserver?FQDN=allscan";
    wc.Headers.Add("Authorization", token);
    var json =wc.UploadStringTaskAsync(url, "");
}

或者，如果您要发送长字符串或复杂的对象MyObject则可以执行以下操作

using (WebClient wc = new WebClient())
{
    var url = currentURL+ "home/scanserver";
    wc.Headers.Add("Authorization", token);
    wc.Headers[HttpRequestHeader.ContentType] = "application/json";
    //here you can also pass a json serialized complex object
    var json =wc.UploadStringTaskAsync(url, "{FQDN:'allscan'}"); 
}

我假设在这里，您的api方法看起来像

public void scanserver(string FQDN) //OR (MyClass myObject)
{
    //do something with token and FQDN 
    //OR use your complex object - myObject
}

Answer 3

UploadStringTaskAsync的返回值为Task<string> 。 您将需要等待返回的任务，添加延续或阻塞线程以等待返回结果。

封锁方式：

using (WebClient wc = new WebClient())
{
    var url = currentURL+ "home/scanserver";
    wc.Headers.Add("Authorization", token);
    var json = wc.UploadStringTaskAsync(url, "FQDN=allscan").Result;
}

使用等待（必须在标记为异步的方法内）：

string json;
using (WebClient wc = new WebClient())
{
    var url = currentURL + "home/scanserver";
    wc.Headers.Add("Authorization", token);
    json = await wc.UploadStringTaskAsync(url, "FQDN=allscan");
}