Question

我想使用HttpClient进行REST POST调用。我一直遇到错误-'RestCall.PostRestCall（string，string，string，string）'：并非所有代码路径都返回值'

下面是我的代码。它的意思是接收baseUrl，contentType，requestBody，httpMethod；作为输入参数，并返回响应状态代码，状态描述和响应内容。

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace RestPostCall
{
    public class RestCall
    {
        public static string PostRestCall(string baseURL, string httpMethod, string contentType, string requestBody)
        {
            HttpClient client = new HttpClient();
            client.BaseAddress = new Uri(baseURL);

            // Add an Accept header for JSON format.
            client.DefaultRequestHeaders.Accept.Add(new 
            MediaTypeWithQualityHeaderValue(contentType));

            // List data response.
            HttpResponseMessage response = client.GetAsync(requestBody).Result;
            if (response.IsSuccessStatusCode)
            {
                // Parse the response body.
                var dataObjects = response.Content.ReadAsAsync<IEnumerable<IDataObject>>().Result;  
                //Make sure to add a reference to System.Net.Http.Formatting.dll

            }
            else
            {
                Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
            }

            //Make any other calls using HttpClient here.

            //Dispose once all HttpClient calls are complete.
            client.Dispose();

         }
     }
 }

Answer 1

您的方法未返回任何值，因此更改签名以返回void类型：

public static void PostRestCall(string baseURL, string httpMethod, string contentType, 
string requestBody)

Answer 2

将方法的返回类型更改为void，或者如果要返回任何值，请使用return语句。

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2 个答案: