Winform项目调用asp.net数据接口

　　最近一个WPF项目需要改写成android项目，思路是在asp.net项目中编写一个通用接口，便于其它平台下调用数据。刚接触到这些东西的时候完全是一头雾水，最根本的原因是不明白网站中的一个网页，为什么其它项目就可以访问它，并获取数据。带着疑问在asp.net项目编写一个简单的数据接口，并新建一个小winform项目直接访问它。本文涉及到的知识点有：在asp.net项目中如何编写一个数据接口；使用反射辨别响应的方法；以及如何获取接口的数据。这里仅仅是介绍如何使用它们，而不讲述使用它们的基本原理，一是本人道行浅薄对基本原理不了解，害怕随便书写误导后人；二是如果阐述其基本原理，势必需要花费大量时间，奈何时间有限。将来如果上述两个条件满足，必会在最下面做出论述，因为这对自己的进步也是一个肯定。闲话少说，开始正文。

　　主要内容：

　　1、asp.net项目下编写数据接口

　　2、使用反射分辨调用方法

　　3、新建一个winform项目测试接口的正确性

1、在asp.net项目下编写一简单接口

编写一个方法，构造一个json字符串Response即可。

private void ExamInfoLogin()
        {
            string aa = "8";
            string bb = "9";

            string roomName = Request.Form["RoomName"];
            if (roomName == "806")
            {
                aa = "7";
            }           
            
            StringBuilder jsonStringBuilder = new StringBuilder();
            jsonStringBuilder.Append("{");
            jsonStringBuilder.Append(""UName":"").Append(aa).Append("",");
            jsonStringBuilder.Append(""Password":"").Append(bb).Append(""");
            jsonStringBuilder.Append("}");
            Response.Write(jsonStringBuilder.ToString());
        }

2、使用反射选取调用方法

假设在aspx页面中有很多方法，而在使用过程中往往仅需要调用其中的某一个方法，此处用反射选取调用方法。

反射过程中使用的常量：

private const string PAGE_PATH_INFO = "/AppDataInterface/ExamLogin.aspx";//页面
        private const string ASSEMBLY_NAME = "OSCEWEB";//程序集
        private const string CLASS_NAME = "OSCEWEB.AppDataInterface.ExamLogin";//类名

重写OnInit方法：

protected override void OnInit(EventArgs e)
        {
            string pathInfo = Request.Params["PATH_INFO"];
            if (pathInfo.StartsWith(PAGE_PATH_INFO + "/"))
            {
                string[] nameList = pathInfo.Substring(PAGE_PATH_INFO.Length + 1).Split('/');
                if (nameList.Length < 1)
                {
                    Response.End();
                    return;
                }

                try
                {
                    Assembly assembly = Assembly.Load(ASSEMBLY_NAME);
                    Type type = assembly.GetType(CLASS_NAME);
                    MethodInfo method = type.GetMethod(nameList[0], System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
                    method.Invoke(this, null);
                }
                catch (Exception ex)
                {
                    Response.End();
                    return;
                }
            }
        }

在Page_Load方法中添加：

if (Request.Params["PATH_INFO"].StartsWith(PAGE_PATH_INFO + "/"))
            {
                Response.End();
            }

3、新建一Winform项目，访问asp.net中数据接口

发布asp.net项目，网址：http://192.168.4.22:8005

1）无需向数据接口传递数据：

private void button1_Click(object sender, EventArgs e)
        {
            string strURL = "http://192.168.4.22:8005/AppDataInterface/ExamLogin.aspx/ExamInfoLogin";
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            response = (System .Net.HttpWebResponse )request .GetResponse ();

            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }

得到的数据是：{"UName":"8","Password":"9"}

2）以post方式向数据接口传递数据，获取接口数据

private void button2_Click(object sender, EventArgs e)
        {
            string strURL = "http://192.168.4.22:8005/AppDataInterface/ExamLogin.aspx/ExamInfoLogin";

            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            string param = "RoomName=806";
            ASCIIEncoding encoding = new ASCIIEncoding ();
            byte[] data = encoding.GetBytes(param);
            request.ContentLength = data.Length;
            System.IO.Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            stream.Close();

            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }

得到的数据：{"UName":"7","Password":"9"}

、、

string url = System.Configuration.ConfigurationSettings.AppSettings["GetHisOrderUrl"];
            string strXml = GetHisOrderXml(hisOrder);

            System.Net.HttpWebRequest request = (System.Net.HttpWebRequest) System.Net.WebRequest.Create(url);
            request.Method = "POST";
            request.ContentType = "text/xml;charset=utf-8";
            byte[] data = Encoding.UTF8.GetBytes(strXml);
            request.ContentLength = data.Length;
            request.Headers["SOAPAction"] = "http://tempuri.org/IRouterService/RunService";
            System.IO.Stream  stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            stream.Close();

            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse) request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response .GetResponseStream(),Encoding.UTF8);
            string responseStr = streamReader.ReadToEnd();
            streamReader.Close();

4、总结

　　按照上述介绍的一些方法确实能完成项目，但是对其为什么该如此还是充满疑惑，总感觉心中无底、战战兢兢，希望有高手可以对小弟指点一二，不胜感激。

附加：

1、post图片上传到服务器中：

public void UploadImage(string imgPath)
        {
            var postUrl = string.Empty;

            HttpWebRequest request = WebRequest.Create(postUrl) as HttpWebRequest;
            request.AllowAutoRedirect = true;
            request.Method = "POST";

            string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
            request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
            byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "
");
            byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "--
");

            int pos = imgPath.LastIndexOf("\");
            string fileName = imgPath.Substring(pos + 1);

            //请求头部信息 
            StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="file";filename="{0}"
Content-Type:application/octet-stream

", fileName));
            byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

            FileStream fs = new FileStream(imgPath, FileMode.Open, FileAccess.Read);
            byte[] bArr = new byte[fs.Length];
            fs.Read(bArr, 0, bArr.Length);
            fs.Close();

            Stream postStream = request.GetRequestStream();
            postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
            postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
            postStream.Write(bArr, 0, bArr.Length);
            postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
            postStream.Close();

            WebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string responseText = streamReader.ReadToEnd();
            streamReader.Close();
            MessageBox.Show(responseText);
        }

2、