HttpRequestHeaderCollection.UserAgent Propriedade

Definição

Namespace:

Windows.Web.Http.Headers

Obtém os objetos HttpProductInfoHeaderValueCollection de objetos HttpProductInfoHeaderValue que representam o valor de um cabeçalho HTTP User-Agent em uma solicitação HTTP.

public:
 property HttpProductInfoHeaderValueCollection ^ UserAgent { HttpProductInfoHeaderValueCollection ^ get(); };

HttpProductInfoHeaderValueCollection UserAgent();

public HttpProductInfoHeaderValueCollection UserAgent { get; }

var httpProductInfoHeaderValueCollection = httpRequestHeaderCollection.userAgent;

Public ReadOnly Property UserAgent As HttpProductInfoHeaderValueCollection

Valor da propriedade

HttpProductInfoHeaderValueCollection

A coleção de objetos HttpProductInfoHeaderValue que representam o valor de um cabeçalho HTTP User-Agent em uma solicitação HTTP. Uma coleção vazia significa que o cabeçalho está ausente.

Comentários

O código de exemplo a seguir mostra um método para definir o cabeçalho User-Agent em um objeto HttpRequestMessage usando a propriedade UserAgent no objeto HttpRequestHeaderCollection .

void DemoUserAgent(HttpRequestMessage m) {
    var h = m.Headers;

    uiLog.Text += "\nUSERAGENT HEADER\n";
    // User-Agent: CERN-LineMode/2.15 libwww/2.17b3
    // User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Zune 4.0; InfoPath.3; MS-RTC LM 8; .NET4.0C; .NET4.0E)
    var ok = h.UserAgent.TryParseAdd("ie");
    ok = h.UserAgent.TryParseAdd("Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Zune 4.0; InfoPath.3; MS-RTC LM 8; .NET4.0C; .NET4.0E)");
    ok = h.UserAgent.TryParseAdd("CERN-LineMode/2.15 libwww/2.17b3");
    h.UserAgent.Add (new HttpProductInfoHeaderValue ("productComment"));
    h.UserAgent.Add(new HttpProductInfoHeaderValue("Mozilla", "1.0"));

    // UserAgent is a HttpProductInfoHeaderValueCollection
    // A collection of HttpProductInfoHeaderValue

    // HttpProductInfoHeaderValue has two items:
    // Product (string)
    // Comment (string)
    //
    // According to the RFC, each "item" is EITHER a product OR a comment, and a product is EITHER product or product/version

    foreach (var item in h.UserAgent) {
        // item has: Value (string), Parameter IList<HttpNameValueHeaderValue>

        uiLog.Text += string.Format("Product: {0} Comment: {1} ToString: {2}\n", item.Product, item.Comment, item.ToString());
    }
    uiLog.Text += string.Format("UserAgent: ToString: {0}\n\n", h.UserAgent.ToString());
}

Confira também

• HttpProductInfoHeaderValue
• HttpProductInfoHeaderValueCollection
• HttpRequestMessage
• Headers