使用HttpClient调用时，带有uri参数的发布（或放置）请求不起作用

本文介绍了使用HttpClient调用时，带有uri参数的发布（或放置）请求不起作用的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

在尝试使用c＃制作Web API并通过c＃HttpClient使用它时，我已经编写了一些控制器和客户端调用，并且工作正常，但是现在我需要使用两个参数（一个简单的值）调用Post方法（长）直接在URL [FromURI]中输入，另一个是在主体中传递的复杂类型。

In trying to make a Web API in c# and consume it via c# HttpClient, I've already written some controllers and client calls and is working fine, but now I need to call a Post method with two parameters, one simple value (long) directly in the URL[FromURI], and the another one is a complex type passed in body.

我想我可以简化答案，假设我只是想要调用帖子或放置URL中传递的一个简单参数。

I think I can simplify the answer, suppose I just want to call a post or put with one simple parameter passed in the URL.

首先，让我们看一下我的Web服务器映射配置：

First of all, lets see my web server mapping config:

HttpConfiguration config = new HttpConfiguration(); config.Routes.MapHttpRoute( name: "DefaultWebApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional });

多数民众赞成在我的Put控制器：

And thats my Put controller:

[HttpPut] public IHttpActionResult PutComandas([FromUri] long ticket) { ... }

我可以使用 PostMan 和类似 localhost：8200 / api / Comandas的URL毫无问题地调用它？ticket = 9 ，但是我找不到用HttpClient进行调用的方法，而且，令我感到奇怪的是，我不能简单地（在PostMan中）调用localhost：8200 / api / Comandas / 9正如我对get请求所做的那样...就像路由配置适用于gets，但不适用于puts / posts ...无论如何，真正的问题是：我找不到使用以下方法进行正确的put调用的方法HttpClient。我正在尝试：

I can call this without problem using PostMan and URL like localhost:8200/api/Comandas?ticket=9, but I can't find a way to do that call with HttpClient, also, it's strange to me that I can not simply call (in PostMan) to localhost:8200/api/Comandas/9 as I can do with get requests... is like the routing configuration is working for gets, but not for puts/posts... Anyway, the real problem is: I can't find the way to do a correct put call with HttpClient. I'm trying:

HttpClient client = new HttpClient(); var response = client.PutAsync("localhost:8200/api/Comandas?ticket=9", null).Result;

但我收到未找到的回复。

but I receive a Not Found response.

注意：我可以使用复杂的身体参数调用Put / Post，而不会出现问题。

Note: I can call Put/Post with complex body parameters without problems.

推荐答案

一种更干净的方法是使用字典并通过FormUrlEncodedContent

A cleaner way would be to use a Dictionary and pass as FormUrlEncodedContent

var url = "localhost:8200/api/Comandas"; var parameters = new Dictionary<string, string> { { "ticket", "9" } }; var encodedContent = new FormUrlEncodedContent(parameters); var response = await client.PutAsync(url, encodedContent);

此外，HttpClient应该只实例化一次，然后重新使用： https：// docs .microsoft / en-us / dotnet / api / system.http.httpclient？view = netframework-4.7.1＃备注

Also as a side note, HttpClient should only be instantiated once and then re-used: docs.microsoft/en-us/dotnet/api/system.http.httpclient?view=netframework-4.7.1#Remarks

编辑：用户现在已澄清，他们正在同时寻找Uri参数和Body参数。从上面的代码继续：

User has now clarified they are looking for both a Uri param and a Body param. Following on from code above:

AddQueryString可通过

AddQueryString is available through

Microsoft.Owin.Infrastructure.WebUtilities.AddQueryString()

或者如果使用.NET Core

or if using .NET Core

Microsoft.AspNetCore.WebUtilities.QueryHelpers.AddQueryString()

var url = "localhost:8200/api/"; // Query string parameters var parameters = new Dictionary<string, string>(){ { "ticket", "9" } }; // Create json for body var content = new JObject(yourBodyObject); // SetupHttpClient client.BaseAddress = new Uri(url); // This is the important bit var requestUri = QueryHelpers.AddQueryString("Comandas", parameters); var request = new HttpRequestMessage(HttpMethod.Put, requestUri); // Setup headers for Content-Type request.Headers.Add("Accept", "application/json"); // Add body content request.Content = new StringContent( content.ToString(), Encoding.UTF8, "application/json" ); // Send the request client.SendAsync(request);