HttpWebRequest.Connection Properti

Definisi

Ruang nama:

System.Net

Rakitan:

System.Net.Requests.dll

Sumber:

HttpWebRequest.cs

Mendapatkan atau mengatur nilai header HTTP Connection.

public string? Connection { get; set; }

Nilai Properti

String

Nilai header HTTP Connection. Nilai defaultnya adalah null.

Pengecualian

ArgumentException

Nilai Connection diatur ke Tetap hidup atau Tutup.

Contoh

Contoh kode berikut menggunakan properti Connection untuk mengatur nilai Header HTTP Koneksi.

class HttpWebRequest_Connection
{
  static void Main()
  {
    try
    {

      // Create a new HttpWebRequest object.Make sure that
      // a default proxy is set if you are behind a firewall.
      HttpWebRequest myHttpWebRequest1 =
        (HttpWebRequest)WebRequest.Create("http://www.contoso.com");

      myHttpWebRequest1.KeepAlive=false;
      // Assign the response object of HttpWebRequest to a HttpWebResponse variable.
      HttpWebResponse myHttpWebResponse1 =
        (HttpWebResponse)myHttpWebRequest1.GetResponse();

      Console.WriteLine("\nThe HTTP request Headers for the first request are: \n{0}",myHttpWebRequest1.Headers);
      Console.WriteLine("Press Enter Key to Continue..........");
      Console.Read();

      Stream streamResponse=myHttpWebResponse1.GetResponseStream();
      StreamReader streamRead = new StreamReader( streamResponse );
      Char[] readBuff = new Char[256];
      int count = streamRead.Read( readBuff, 0, 256 );
      Console.WriteLine("The contents of the Html page are.......\n");
      while (count > 0)
      {
        String outputData = new String(readBuff, 0, count);
        Console.Write(outputData);
        count = streamRead.Read(readBuff, 0, 256);
      }
      Console.WriteLine();
      // Close the Stream object.
      streamResponse.Close();
      streamRead.Close();
      // Release the resources held by response object.
      myHttpWebResponse1.Close();
      // Create a new HttpWebRequest object for the specified Uri.
      HttpWebRequest myHttpWebRequest2 =
        (HttpWebRequest)WebRequest.Create("http://www.contoso.com");
      myHttpWebRequest2.Connection="Close";
      // Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
      HttpWebResponse myHttpWebResponse2 =
        (HttpWebResponse)myHttpWebRequest2.GetResponse();
      // Release the resources held by response object.
      myHttpWebResponse2.Close();
      Console.WriteLine("\nThe Http RequestHeaders are \n{0}",myHttpWebRequest2.Headers);
      Console.WriteLine("\nPress 'Enter' Key to Continue.........");
      Console.Read();
    }
    catch(ArgumentException e)
    {
      Console.WriteLine("\nThe second HttpWebRequest object has raised an Argument Exception as 'Connection' Property is set to 'Close'");
      Console.WriteLine("\n{0}",e.Message);
    }
    catch(WebException e)
    {
      Console.WriteLine("WebException raised!");
      Console.WriteLine("\n{0}",e.Message);
      Console.WriteLine("\n{0}",e.Status);
    }
    catch(Exception e)
    {
      Console.WriteLine("Exception raised!");
      Console.WriteLine("Source :{0} " , e.Source);
      Console.WriteLine("Message :{0} " , e.Message);
    }
  }
}

Keterangan

Perhatian

WebRequest, HttpWebRequest, ServicePoint, dan WebClient usang, dan Anda tidak boleh menggunakannya untuk pengembangan baru. Gunakan HttpClient sebagai gantinya.

Permintaan mengirimkan properti Connection ke sumber daya Internet sebagai header HTTP Connection. Jika nilai properti KeepAlivetrue, nilai "Tetap hidup" ditambahkan ke akhir header Connection.

Untuk menghapus header HTTP Connection, atur properti Connection ke null.

Mengubah properti Connection setelah permintaan dimulai dengan memanggil metode GetRequestStream, BeginGetRequestStream, GetResponse, atau BeginGetResponse melemparkan InvalidOperationException.

Catatan

Nilai untuk properti ini disimpan dalam WebHeaderCollection. Jika WebHeaderCollection diatur, nilai properti akan hilang.

Berlaku untuk