WebHeaderCollection.Remove Metoda

Definice

Obor názvů:

System.Net

Sestavení:

netstandard.dll, System.Net.WebHeaderCollection.dll

Odebere zadanou hlavičku z kolekce.

Přetížení

Name	Description
Remove(HttpRequestHeader)	Odebere zadanou hlavičku z kolekce.
Remove(HttpResponseHeader)	Odebere zadanou hlavičku z kolekce.
Remove(String)	Odebere zadanou hlavičku z kolekce.

Remove(HttpRequestHeader)

Zdroj:

WebHeaderCollection.cs

Odebere zadanou hlavičku z kolekce.

public:
 void Remove(System::Net::HttpRequestHeader header);

public void Remove(System.Net.HttpRequestHeader header);

override this.Remove : System.Net.HttpRequestHeader -> unit

Public Sub Remove (header As HttpRequestHeader)

Parametry

header

HttpRequestHeader

Instance HttpRequestHeader , která se má z kolekce odebrat.

Výjimky

InvalidOperationException

Tato WebHeaderCollection instance nepovoluje instance .HttpRequestHeader

Poznámky

Remove odstraní zadanou hlavičku z kolekce. Pokud zadaná hlavička neexistuje, metoda neprovede nic.

Remove(HttpResponseHeader)

Zdroj:

WebHeaderCollection.cs

Odebere zadanou hlavičku z kolekce.

public:
 void Remove(System::Net::HttpResponseHeader header);

public void Remove(System.Net.HttpResponseHeader header);

override this.Remove : System.Net.HttpResponseHeader -> unit

Public Sub Remove (header As HttpResponseHeader)

Parametry

header

HttpResponseHeader

Instance HttpResponseHeader , která se má z kolekce odebrat.

Výjimky

InvalidOperationException

Tato WebHeaderCollection instance nepovoluje instance .HttpResponseHeader

Poznámky

Remove odstraní zadanou hlavičku z kolekce. Pokud zadaná hlavička neexistuje, metoda neprovede nic.

Remove(String)

Zdroj:

WebHeaderCollection.cs

Odebere zadanou hlavičku z kolekce.

public:
 override void Remove(System::String ^ name);

public override void Remove(string name);

override this.Remove : string -> unit

Public Overrides Sub Remove (name As String)

Parametry

name

String

Název hlavičky, která se má z kolekce odebrat.

Výjimky

ArgumentNullException

name je nullEmpty.

ArgumentException

name je omezená hlavička.

-nebo-

name obsahuje neplatné znaky.

Příklady

Následující příklad používá metodu Remove k odebrání hlavičky z objektu WebHeaderCollection. Po odebrání záhlaví se v tomto příkladu na obrazovku vytiskne všechna existující záhlaví, aby se prokázalo, že bylo odebráno.

try {
    // Create a web request for "www.msn.com".
    HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("http://www.msn.com");

    // Get the headers associated with the request.
    WebHeaderCollection myWebHeaderCollection = myHttpWebRequest.Headers;

    // Set the Cache-Control header.
    myWebHeaderCollection.Set("Cache-Control", "no-cache");

    // Get the associated response for the above request.
    HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();

    // Print the headers of the request to console.
    Console.WriteLine("Print request headers after adding Cache-Control for first request:");
    printHeaders(myHttpWebRequest.Headers);

    // Remove the Cache-Control header for the new request.
    myWebHeaderCollection.Remove("Cache-Control");

    // Get the response for the new request.
    myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();

    // Print the headers of the new request without the Cache-Control header.
    Console.WriteLine("Print request headers after removing Cache-Control for the new request:");
    printHeaders(myHttpWebRequest.Headers);
    myHttpWebResponse.Close();
}
// Catch exception if trying to remove a restricted header.
catch(ArgumentException e) {
    Console.WriteLine("Error : Trying to remove a restricted header");
    Console.WriteLine("ArgumentException is thrown. Message is :" + e.Message);
}
catch(WebException e) {
    Console.WriteLine("WebException is thrown. Message is :" + e.Message);
    if(e.Status == WebExceptionStatus.ProtocolError) {
        Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
        Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
        Console.WriteLine("Server : {0}", ((HttpWebResponse)e.Response).Server);
    }
}
catch(Exception e) {
    Console.WriteLine("Exception is thrown. Message is :" + e.Message);
}

Public Shared Sub Main()
  Try
        'Create a web request for "www.msn.com".
        Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.msn.com"), HttpWebRequest)
        
        'Get the headers associated with the request.
        Dim myWebHeaderCollection As WebHeaderCollection = myHttpWebRequest.Headers
        
        'Set the Cache-Control header.
        myWebHeaderCollection.Set("Cache-Control", "no-cache")
        
        'Get the associated response for the above request.
        Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        
        'Print the headers of the request to console.
        Console.WriteLine("Print request headers after adding Cache-Control for first request")
        printHeaders(myHttpWebRequest.Headers)
        
   
        'Remove the Cache-Control header for the new request.
        myWebHeaderCollection.Remove("Cache-Control")
        
        'Code example for "Remove" method of "WebHeaderCollection" ends here.
        'Get the response for the new request.
        myHttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        
        'Print the headers of the new request without the Cache-Control header.
        Console.WriteLine("Print request headers after removing Cache-Control for the new request")
        printHeaders(myHttpWebRequest.Headers)
        myHttpWebResponse.Close()
    'Catch exception if trying to remove a restricted header.
    Catch e As ArgumentException
        Console.WriteLine("Error : Trying to remove a restricted header")
        Console.WriteLine(e.Message)
    Catch e As WebException
        Console.WriteLine(e.Message)
        If e.Status = WebExceptionStatus.ProtocolError Then
            Console.WriteLine("Status Code : {0}", CType(e.Response, HttpWebResponse).StatusCode)
            Console.WriteLine("Status Description : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
            Console.WriteLine("Server : {0}", CType(e.Response, HttpWebResponse).Server)
        End If
    Catch e As Exception
        Console.WriteLine(e.Message)
    End Try

End Sub

Poznámky

Remove odstraní zadanou hlavičku z kolekce. Pokud zadaná hlavička neexistuje, vrátí se metoda.