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WebHeaderCollection.AllKeys Property

Gets all header names (keys) in the collection.

Namespace: System.Net
Assembly: System (in system.dll)

public override string[] AllKeys { get; }
/** @property */
public String[] get_AllKeys ()

public override function get AllKeys () : String[]

Not applicable.

Property Value

An array of type String containing all header names in a Web request.

The following code example uses the AllKeys property to get the header names a WebHeaderCollection.

if (args.Length == 0)
{
    Console.WriteLine("must specify a URL!");
    return;
}
string server = args[0];

// Create the web request 
HttpWebRequest myHttpWebRequest = 
    (HttpWebRequest) WebRequest.Create(server);
myHttpWebRequest.Timeout = 1000;
// Get the associated response for the above request.
HttpWebResponse myHttpWebResponse = 
    (HttpWebResponse) myHttpWebRequest.GetResponse();

// Get the headers associated with the response.
WebHeaderCollection myWebHeaderCollection = 
    myHttpWebResponse.Headers;

for(int i = 0; i < myWebHeaderCollection.Count; i++)
{
    String header = myWebHeaderCollection.GetKey(i);
    String[] values = 
        myWebHeaderCollection.GetValues(header);
    if(values.Length > 0) 
    {
        Console.WriteLine("The values of {0} header are : "
                         , header);
        for(int j = 0; j < values.Length; j++) 
            Console.WriteLine("\t{0}", values[j]);
    }
    else
        Console.WriteLine("There is no value associated" +
            "with the header");
}
Console.WriteLine("");

// Get the headers again, using new properties (Keys, 
// AllKeys, Clear) and methods (Get and GetKey)

string[] headers = myWebHeaderCollection.AllKeys;

// enumerate through the header collection.
foreach (string s in headers)
{
    Console.WriteLine("Header {0}, value {1}",
        s,
        myWebHeaderCollection.Get(s) );
}

Console.WriteLine("");

// show the use of Get(Int32) and GetValue(Int32)
if (myWebHeaderCollection.Count > 0)
{
    // get the name and value of the first header
    int index=0;
    Console.WriteLine("Header {0}: name {1}, value {2}",
        index, 
        myWebHeaderCollection.GetKey(index),
        myWebHeaderCollection.Get(index));
}

myWebHeaderCollection.Clear();

myHttpWebResponse.Close();

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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