HttpClient通过控制台应用程序C#消耗Web API [英] Httpclient consume web api via console app C#

问题描述

我正在尝试通过使用Httpclient的控制台应用程序使用以下Web api.我被困在如何传递参数中.参数将作为命令行参数来.这是我的Rest api

I am trying to consume the below web api via console app using Httpclient. I am stuck as in how to pass the parameter. The paramter is coming as a command line argument. This is my Rest api

[HttpPost, Route("Test")]
        public IHttpActionResult Test(bool sample = false)
        {             
                return Ok();
        }

此参数来自命令行参数

/Parameters:sample=true.

这是我在控制台应用程序中解析参数的方式

Here is how I am parsing out the parameter in the console app

 static int Main(string[] args)
        {

                if (args.Length == 0)
                {
                    Console.Error.WriteLine("No action provided.");
                    return -1;
                }
                foreach (string param in args)
                {
                    switch (param.Substring(0, param.IndexOf(":")))
                    {
                        case "/Action":
                            action = param.Substring(param.IndexOf(":") + 1);
                            break;
                        case "/Parameters":
                            parameter = param.Substring(param.IndexOf(":") + 1);
                            break;    
                    }
                }
            return 0;
        }

一旦我得到了这种格式的参数

Once I get my parameter which is in this format

parameter ="sample = true"

parameter = "sample=true"

我正在尝试调用网络api调用，但无法传递参数值.谁能指出我在做什么错

I am trying to invoke the web api call but unable to pass the parameter value. can anybody pin point what I am doing wrong

    client.BaseAddress = new Uri(ConfigurationManager.AppSettings.Get("BaseWebApiUrl"));
                    client.DefaultRequestHeaders.Accept.Clear();
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                    var apiUrl = GetApiURL();


                   var Context = new StringContent(JsonConvert.SerializeObject(parameter), Encoding.UTF8, "application/json");

 var respFeed = await client.PostAsync(apiUrl, Context);

推荐答案

默认情况下，Web Api中的基本类型参​​数永远不会绑定到请求的正文.

By default in Web Api basic type parameters are never bound to the body of the request.

如果要强制将 bool 参数与请求正文绑定，则需要使用 FromBodyAttribute 装饰它:

If you want to forcefully bind your bool parameter with the request body you need to decorate it with FromBodyAttribute:

[HttpPost, Route("Test")]
public IHttpActionResult Test([FromBody] bool sample = false)
{             
    return Ok();
}

请注意，即使执行此操作，您的请求也不适用于Web Api.必须以特定格式传递单个基本类型参​​数.在您的情况下，您的请求正文必须为以下内容:

Be aware that even if you do this your request is not valid for Web Api. A single basic type parameter must be passed with a specific format. In your case your request body must be the following:

=true

---

一种更好的方法是将您的Action参数转换为一个类:

---

A better approach is to turn your Action parameter into a class:

public class TestModel
{
    public bool Sample { get; set; }
}

[HttpPost, Route("Test")]
public IHttpActionResult Test(TestModel model)
{
    return Ok();
}

这样，您将能够将Json对象作为请求正文发送，例如:

This way you will be able to send a Json object as request body, like:

{
    "sample": true
}

这是一个如何获得这种结果的小例子:

This is a small example of how you could achieve such a result:

var parameterDictionary = parameter.Split("=").ToDictionary(s => s[0], s => bool.Parse(s[1]));
var json = JsonConvert.SerializeObject(parameterDictionary);
var content = new StringContent(json, Encoding.UTF8, "application/json");
var respFeed = await client.PostAsync(apiUrl, content);

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