.NET 4.0中HttpClient的使用情况如何？ [英] .Net 4.0 HttpClient usage?

问题描述

即时通讯在.NET 4.0中，并尝试使用HttpClient的。我读过一些文章说，它已不再支持4.0，但你仍然可以使用它？我已经包含了 System.Net.Http; 组件，但它没有让我提供必要的PARAMS到的HttpClient 。任何想法如何，我可以解决这个问题？

我加粗那里的错误存在的。

 使用（HttpClient的HTTP =新**的HttpClient（{0} / V1 / DM /标签/ {1}的.xml，MI_API_URL **））
        {
            HTTP ** TransportSettings **凭证=新的NetworkCredential（apiusername，apipassword）。

            名单＆LT; KeyValuePair＆LT;字符串，字符串＆GT;＆GT; PARMS =新的名单，其中，KeyValuePair＆LT;字符串，字符串＆GT;＆GT;（）;
            parms.Add（新KeyValuePair＆LT;字符串，字符串＆GT;（状态，刮））;

            HTT presponseMessage响应= HTTP **获取**（新的URI（devices.xml，UriKind.Relative），PARMS）。
            response.EnsureStatusIsSuccessful（）;
            responseoutput = response.Content.ReadAsString（）;
            xdoc.LoadXml（responseoutput）;
 

解决方案

根据MSDN的HttpClient只支持.NET框架4.5。不过有HttpClient的对.NET 4.0的实现。你可以在这里下载：

HttpClient的为.NET 4.0

MSDN：HttpClient的

仍然有在实现一定的差异。例如，在版本.NET 4.0没有构造W / 2的参数。请参阅源$ C ​​$ C的详细资料：

<一个href="http://wcf.$c$cplex.com/SourceControl/changeset/view/417c9a96fc24#WCFWebApi/Http/Src/Microsoft.Net.Http/HttpClient.cs">HttpClient对于.NET 4.0源$ C ​​$ C

关于你提到的例子：

• 在没有构造函数中的W IMPL / 2 PARAMS。对于.NET 4.0
• 在没有获取方法W中实现了一套/ 2 PARAMS。对于.NET 4.0
• 有一个在实现了一套没有TransportSettings财产。对于.NET 4.0

im in .Net 4.0 and attempting to use the HttpClient. I read some articles saying that it was no longer supported in 4.0 but that you could still use it? i've included the System.Net.Http; assembly but it's not allowing me to provide the necessary params to the HttpClient. Any idea how I could fix this?

I've bolded where the errors are occuring.

using (HttpClient http = new **HttpClient("{0}/v1/dm/labels/{1}.xml", MI_API_URL**))
        {
            http.**TransportSettings**.Credentials = new NetworkCredential(apiusername, apipassword);

            List<KeyValuePair<string, string>> parms = new List<KeyValuePair<string, string>>();
            parms.Add(new KeyValuePair<string, string>("Status", "Wiped"));

            HttpResponseMessage response = http.**Get**(new Uri("devices.xml", UriKind.Relative), parms);
            response.EnsureStatusIsSuccessful();
            responseoutput = response.Content.ReadAsString();
            xdoc.LoadXml(responseoutput);

解决方案

As per MSDN HttpClient is supported only in .NET Framework 4.5. Nevertheless there is an implementation of HttpClient for .NET 4.0. You can download it here:

HttpClient for .NET 4.0

MSDN: HttpClient

Still there are some differences in implementations. For example in version for .NET 4.0 there is no constructor w/ 2 parameters. Please see the source code for more information:

HttpClient for .NET 4.0 source code

Regarding your example:

• There is no constructor w/ 2 params in impl. for .NET 4.0
• There is no Get method w/ 2 params in impl. for .NET 4.0
• There is no TransportSettings property in impl. for .NET 4.0

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