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Winform项目调用asp.net数据接口

Jun 07, 2016 pm 04:04 PM
asp.net interface data transfer project

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

  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。

复制代码
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());
        }
Copy after login
复制代码

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
Copy after login

重写OnInit方法:

复制代码
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;
                }
            }
        }
Copy after login
复制代码

在Page_Load方法中添加:

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

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:

复制代码
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);
        }
Copy after login
复制代码

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

复制代码
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);
        }
Copy after login
复制代码

得到的数据:{"UName":"7","Password":"9"}

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。

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