通过

HttpRequestHeaderCollection.UserAgent 属性

  • 参考

定义

命名空间:
Windows.Web.Http.Headers
编辑

获取 HttpProductInfoHeaderValue 对象的 HttpProductInfoHeaderValueCollection ，这些对象表示 HTTP 请求中 用户代理 HTTP 标头的值。

public:
 property HttpProductInfoHeaderValueCollection ^ UserAgent { HttpProductInfoHeaderValueCollection ^ get(); };
HttpProductInfoHeaderValueCollection UserAgent();
public HttpProductInfoHeaderValueCollection UserAgent { get; }
var httpProductInfoHeaderValueCollection = httpRequestHeaderCollection.userAgent;
Public ReadOnly Property UserAgent As HttpProductInfoHeaderValueCollection

属性值

HttpProductInfoHeaderValueCollection

HttpProductInfoHeaderValue 对象的集合，这些对象表示 HTTP 请求中用户代理 HTTP 标头的值。 空集合表示标头不存在。

注解

下面的示例代码演示了一种方法，该方法使用 HttpRequestHeaderCollection 对象的 UserAgent 属性在 HttpRequestMessage 对象上设置 User-Agent 标头。

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());
}

适用于

另请参阅