api接口怎麼傳參

[-一个大坑]

[System.Web.Http.HttpPost]
        public HttpResponseMessage GetProduceEmplids([FromBody]Dictionary<string, int> counts)
        {
            var result = ADMAPI.ProduceEmplids(counts);
            return ApiResult.toJson(result, string.Empty);
        }

看著是鍵值對，這樣傳值接收的是null

string url = ConfigurationManager.AppSettings["DLRWebAPI"].ToString().Trim() + "/GetProduceEmplids";
            string param = "{\"Z\":5}";
            var aa= HttpPost(url, param);

public static string HttpPost(string url, string param)
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            byte[] bs = Encoding.ASCII.GetBytes(param);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded;";
            request.ContentLength = bs.Length;
            using (Stream reqStream = request.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
            }

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                var aa = reader.ReadToEnd();
                return reader.ReadToEnd();
            }
        }
        catch (Exception ex)
        {
            return "Error";
        }
    }

[-一个大坑]

引用 1 楼 stherix 的回复:

using (var client = new HttpClient())
{
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("thing1", "1"));
values.Add(new KeyValuePair<string, string>("thing2 ", "2"));

var content = new FormUrlEncodedContent(values);

var response = await client.PostAsync("请求地址", content);

var responseString = await response.Content.ReadAsStringAsync();
}

.net 版本較低，不能引用HttpClient
無法安裝套件 'System.Net.Http 4.3.4'。您正嘗試將此套件安裝到以 '.NETFramework,Version=v3.5' 為目標的專案，但該套件不包含任何與架構相容的組件參照或內容檔案。如需詳細資訊，請聯繫套件作者。

[-一个大坑]

引用 1 楼 stherix 的回复:

using (var client = new HttpClient())
{
var values = new List<KeyValuePair<string, string>>();
values.Add(new KeyValuePair<string, string>("thing1", "1"));
values.Add(new KeyValuePair<string, string>("thing2 ", "2"));

var content = new FormUrlEncodedContent(values);

var response = await client.PostAsync("请求地址", content);

var responseString = await response.Content.ReadAsStringAsync();
}

System.Net.Http 2.0 版本也試了也不行
無法安裝套件 'Microsoft.Net.Http 2.0.20505.0'。您正嘗試將此套件安裝到以 '.NETFramework,Version=v3.5' 為目標的專案，但該套件不包含任何與架構相容的組件參照或內容檔案。如需詳細資訊，請聯繫套件作者。

[正怒月神]

https://blog.csdn.net/hanjun0612/article/details/80431698

[-一个大坑]

request.ContentType = "application/json";

[不胖到130不改名字]

api接口相关可以看看这篇文章
https://www.cnblogs.com/landeanfen/p/5337072.html#_label1_0

[stherix]

using (var client = new HttpClient()) { var values = new List<KeyValuePair<string, string>>(); values.Add(new KeyValuePair<string, string>("thing1", "1")); values.Add(new KeyValuePair<string, string>("thing2 ", "2")); var content = new FormUrlEncodedContent(values); var response = await client.PostAsync("请求地址", content); var responseString = await response.Content.ReadAsStringAsync(); }

[叫我 Teacher 周]

如果api要求你用json对象或实体，你这样是不行的