Silverlight 版本的 System.Net.Http ， 源自 Mono 的源代码。 使用方法参考 http://msdn.microsoft.com/library/system.net.http.aspx
由于 Silverlight 平台对 HTTP 的限制， 移除了部分功能， 例如 Proxy 、 AllowAutoRedirect 、 PreAuthenticate 以及 KeepAlive 设置等， 这些都是 Silverlight 不支持的。
对于 Silverlight 的 BrowserHttp ， 仅仅支持 GET 和 POST 方法， 示例代码如下：
HttpClient client = new HttpClient {
BaseAddress = new Uri("http://localhost:8080/HttpTestWeb/api/")
};
// Get string from server
client.GetStringAsync("browserhttp/").ContinueWith(t => {
if (t.IsFaulted) {
// report error here
//Application.Current.ReportError(t.Exception.GetBaseException());
} else {
string txt = t.Result;
//Assert.IsFalse(string.IsNullOrEmpty(txt));
}
});
// Post form data to server
var param = new Dictionary<string, string> {
{"Name", "Client Post"},
{"Age", "1"},
{"Birthday", DateTime.Today.ToString("s")}
};
client.PostAsync("browserhttp/", new FormUrlEncodedContent(param)).ContinueWith(t => {
if (t.IsFaulted) {
// report error here
// Application.Current.ReportError(t.Exception.GetBaseException());
} else {
HttpResponseMessage response = t.Result;
//Assert.IsTrue(response.EnsureSuccessStatusCode);
}
});对于 ClientHttp ， 除了 GET 和 POST 之外， 还支持 PUT 和 DELETE （其它的 HTTP 方法也可能支持， 未测试）， 示例代码如下：
// PUT to update
var param = new Dictionary<string, string> {
{"Id", "1" },
{"Name", "Client Post"},
{"Age", "1"},
{"Birthday", DateTime.Today.ToString("s")}
};
client.PutAsync("clienthttp/1", new FormUrlEncodedContent(param)).ContinueWith(t => {
if (t.IsFaulted) {
// report error here
// Application.Current.ReportError(t.Exception.GetBaseException());
} else {
HttpResponseMessage response = t.Result;
//Assert.IsTrue(response.EnsureSuccessStatusCode);
}
});
// DELETE
client.DeleteAsync("clienthttp/1").ContinueWith(t => {
if (t.IsFaulted) {
// report error here
// Application.Current.ReportError(t.Exception.GetBaseException());
} else {
HttpResponseMessage response = t.Result;
//Assert.IsTrue(response.EnsureSuccessStatusCode);
}
});支持职责链模式的 MessageProcessingHandler ， 如下面的代码所示：
public class CustomProcessingHandler : MessageProcessingHandler {
protected override HttpRequestMessage ProcessRequest(HttpRequestMessage request, CancellationToken cancellationToken) {
if (request.Method != HttpMethod.Get && request.Method != HttpMethod.Post) {
request.Headers.TryAddWithoutValidation("RequestMethod", request.Method.Method);
request.Method = HttpMethod.Post;
}
return request;
}
protected override HttpResponseMessage ProcessResponse(HttpResponseMessage response, CancellationToken cancellationToken) {
var request = response.RequestMessage;
if (request.Headers.Contains("RequestMethod")) {
IEnumerable<string> values;
if (request.Headers.TryGetValues("RequestMethod", out values)) {
request.Method = new HttpMethod(values.First());
}
}
return response;
}
}使用起来也是非常简单的：
var customHandler = new CustomProcessingHandler {
InnerHandler = new HttpClientHandler()
};
var client = new HttpClient(customHandler, true) {
BaseAddress = new Uri("http://localhost:8080/HttpTestWeb/api/")
};