问题：

自定义webapi怎么接收HTTP请求推送，Post方法，ContentType 为“application/x-www-form-urlencoded”。的参数

解决方案：

1、创建一个无参数的自定义WebApi方法，例如Jac.XkDemo.BOS.WebApi.TestWebApiService.Test；

2、第三方调用接口 /k3cloud/Jac.XkDemo.BOS.WebApi.TestWebApiService.Test,Test24.PlugIns.BL.common.kdsvc 

通过Header或Cookie传递SessionId

3、在自定义WebApi方法中通过HttpContext.Current.Request获取传参和SessionId，创建Context。

WebApi代码：

using Kingdee.BOS.ServiceFacade.KDServiceFx;
using Kingdee.BOS.WebApi.ServicesStub;
using System.Text;
using System.Web;
namespace Jac.XkDemo.BOS.WebApi
{
    /// <summary>
    /// 【WebApi】自定义WebApi接口
    /// </summary>
    [Kingdee.BOS.Util.HotUpdate]
    public class TestWebApiService: AbstractWebApiBusinessService
    {
        public TestWebApiService(KDServiceContext context) : base(context)
        {
        }
        const string kd_sessionid_key = "kdservice-sessionid";

        public object Test()
        {
            //通过HttpPost传参时，this.KDContext.Session.AppContext为null，需要自行从Header或Cookie中拿到kdservice-sessionid，创建Context
            StringBuilder sb = new StringBuilder();
            foreach (var key in HttpContext.Current.Request.Form.Keys)
            {
                sb.AppendFormat("{0}={1}\r\n", key, HttpContext.Current.Request.Form[key.ToString()]);
            }

            var kd_sessionid = HttpContext.Current.Request.Headers[kd_sessionid_key];
            if (!string.IsNullOrWhiteSpace(kd_sessionid))
            {
                // 获取登录用户会话信息
                var userSession = SessionManager.GetCurrentSession(kd_sessionid);
                if (userSession != null)
                {
                    // 获取登录用户上下文
                    var userContext = userSession.AppContext;
                    sb.AppendLine("当前用户：" + userContext.UserName);
                }
            }
            return sb.ToString();
        }
    }
}

调用端代码：

void Main()
{
	var jser = new System.Web.Script.Serialization.JavaScriptSerializer();
	var loginResult = InvokeHelper.Login();
	Console.WriteLine(loginResult);
	var json = jser.Serialize(new object[] { });

	//正常的WebApi调用
	var result = InvokeHelper.Call("Jac.XkDemo.BOS.WebApi.TestWebApiService.Test,Test24.PlugIns.BL.common.kdsvc", new object[] { });
	Console.WriteLine(result);


	//Post调用
	WebClient wc = new WebClient();
	string url = "http://localhost/k3cloud/Jac.XkDemo.BOS.WebApi.TestWebApiService.Test,Test24.PlugIns.BL.common.kdsvc";
	wc.Encoding = Encoding.UTF8;
	wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
	wc.Headers.Add("kdservice-sessionid", "c40e4b13-ce34-4d4f-9f48-ddc1ab4697e4");
	string result2 = wc.UploadString(url, "userName=admin&pwd=123456");
	Console.WriteLine(result2);
}

public static class InvokeHelper
{
	private static string CloudUrl = "http://localhost/k3cloud/";

	public static string Login()
	{
		HttpClient httpClient = new HttpClient();
		httpClient.Url = string.Concat(CloudUrl, "Kingdee.BOS.WebApi.ServicesStub.AuthService.ValidateUser.common.kdsvc");
		List<object> Parameters = new List<object>();
		Parameters.Add("664cc733b161a9");//
		Parameters.Add("cc");//用户
		Parameters.Add("888888");//密码
		Parameters.Add(2052);
		var jser = new System.Web.Script.Serialization.JavaScriptSerializer();
		httpClient.Content = jser.Serialize(Parameters).Dump("login send content");
		return httpClient.SysncRequest();
	}

	public static string Call(string detailAddress, object[] paras)
	{
		var jsonInputParam = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(paras);
		HttpClient httpClient = new HttpClient();
		httpClient.Url = CloudUrl + detailAddress;
		httpClient.Content = jsonInputParam;
		string jsonOutputParam = httpClient.SysncRequest();
		return jsonOutputParam;
	}


}


class HttpClient
{
	/// <summary>
	/// Seivice URL
	/// </summary>
	public string Url { get; set; }
	/// <summary>
	/// 内容
	/// </summary>
	public string Content { get; set; }
	/// <summary>
	/// Cookie，保证登录后，所有访问持有一个Cookie；
	/// </summary>
	static CookieContainer Cookie = new CookieContainer();

	/// <summary>
	/// HTTP访问
	/// </summary>
	public string SysncRequest()
	{
		HttpWebRequest httpRequest = HttpWebRequest.Create(Url) as HttpWebRequest;
		httpRequest.Method = "POST";
		httpRequest.ContentType = "application/json";
		httpRequest.CookieContainer = Cookie;
		httpRequest.Timeout = 1000 * 60 * 10;//10min

		using (Stream reqStream = httpRequest.GetRequestStream())
		{
			Dictionary<string, object> jObj = new Dictionary<string, object>();
			jObj.Add("format", 1);
			jObj.Add("useragent", "ApiClient");
			jObj.Add("rid", Guid.NewGuid().ToString().GetHashCode().ToString());
			jObj.Add("parameters", Content);
			jObj.Add("timestamp", DateTime.Now);
			jObj.Add("v", "1.0");
			//string sContent = jObj.ToString();
			string sContent = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(jObj);
			var bytes = UnicodeEncoding.UTF8.GetBytes(sContent);
			reqStream.Write(bytes, 0, bytes.Length);
			reqStream.Flush();
		}
		using (var repStream = httpRequest.GetResponse().GetResponseStream())
		{
			using (var reader = new StreamReader(repStream))
			{
				return ValidateResult(reader.ReadToEnd());
			}
		}
	}

	private static string ValidateResult(string responseText)
	{
		if (responseText.StartsWith("response_error:"))
		{
			var failText = responseText.TrimStart("response_error:".ToCharArray());
		}
		return responseText;
	}
}