編寫(xiě)輕量ajax組件01-與webform平臺(tái)上的各種實(shí)現(xiàn)方式比較

body>
  h1>index/h1>
  input type="button" value="GetData" onclick="getData()" />
  span id="result">/span>
/body>
script type="text/javascript">
  function getData() {
    $.get("GetData", function (data) {
      $("#result").text(data);
    });
  }
/script>

public class AjaxController : Controller
{
  public ActionResult GetData()
  {
    if(Request.IsAjaxRequest())
    {
      return Content("data");
    }
    return View();
  }
}

body>
  form id="form1" runat="server">
  div>    
    input type="button" value="獲取回調(diào)結(jié)果" onclick="callServer()" />
    span id="result" style="color:Red;">/span>
  /div>
  /form>
/body>
script type="text/javascript">
  function getCallbackResult(result){
    document.getElementById("result").innerHTML = result;
  }
/script>

public partial class Test1 : System.Web.UI.Page, ICallbackEventHandler
{    
  protected void Page_Load(object sender, EventArgs e)
  {
    //客戶端腳本Manager
    ClientScriptManager scriptMgr = this.ClientScript;
 
    //獲取回調(diào)函數(shù)，getCallbackResult就是回調(diào)函數(shù)
    string functionName = scriptMgr.GetCallbackEventReference(this, "", "getCallbackResult", "");
 
    //發(fā)起請(qǐng)求的腳本，callServer就是點(diǎn)擊按鈕事件的執(zhí)行函數(shù)
    string scriptExecutor = "function callServer(){" + functionName + ";}";
 
    //注冊(cè)腳本
    scriptMgr.RegisterClientScriptBlock(this.GetType(), "callServer", scriptExecutor, true);
  }
 
  //接口方法
  public string GetCallbackResult()
  {
    return "callback result";
  }
 
  //接口方法
  public void RaiseCallbackEvent(string eventArgument)
  {
  }
}

public void ProcessRequest(HttpContext context)
{
  Page page = new Page();
  Control control = page.LoadControl("~/PageOrAshx/UserInfo.ascx");
  if (control != null)
  {
    StringWriter sw = new StringWriter();
    HtmlTextWriter writer = new HtmlTextWriter(sw);
    control.RenderControl(writer);
    string html = sw.ToString();
    context.Response.Write(html);        
  }
}

public class PageBase : Page
{
  public override void ProcessRequest(HttpContext context)
  {
    HttpRequest request = context.Request;
    if (string.Compare(request.Headers["AjaxFlag"],"AjaxFlag",0) == 0)
    {
      string methodName = request.Headers["MethodName"];
      if (string.IsNullOrEmpty(methodName))
      {
        EndRequest("MethodName標(biāo)記不能為空！");
      }
      Type type = this.GetType().BaseType;
      MethodInfo info = type.GetMethod(methodName, BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static);
      if (info == null)
      {
        EndRequest("找不到合適的方法調(diào)用！");
      }        
      string data = info.Invoke(this, null) as string;
      EndRequest(data);
    }
    base.ProcessRequest(context);
  }
  private void EndRequest(string msg)
  {
    HttpResponse response = this.Context.Response;
    response.Write(msg);
    response.End();
  }
}

public partial class Test1 : PageBase
{
  protected void Page_Load(object sender, EventArgs e)
  {
  }
  public string GetData()
  {
    return "213";
  }
}

function getData(){
  $.ajax({
    headers:{"AjaxFlag":"XHR","MethodName":"GetData"},
    success:function(data){
      $("#result").text(data);
    }
  });
}

public class AjaxMethodAttribute : Attribute
{
}

public class CacheMethodInfo
{
  public string MethodName { get; set; }
  public MethodInfo MethodInfo { get; set; }
  public ParameterInfo[] Parameters { get; set; }
}

public class PageBase : Page
{
  private static Hashtable _ajaxTable = Hashtable.Synchronized(new Hashtable());
  public override void ProcessRequest(HttpContext context)
  {      
    HttpRequest request = context.Request;
    if (string.Compare(request.Headers["AjaxFlag"],"XHR",true) == 0)
    {
      InvokeMethod(request.Headers["MethodName"]);
    }
    base.ProcessRequest(context);
  }
  /// summary>
  /// 反射執(zhí)行函數(shù)
  /// /summary>
  /// param name="methodName">/param>
  private void InvokeMethod(string methodName)
  {
    if (string.IsNullOrEmpty(methodName))
    {
      EndRequest("MethodName標(biāo)記不能為空！");
    }
    CacheMethodInfo targetInfo = TryGetMethodInfo(methodName);
    if (targetInfo == null)
    {
      EndRequest("找不到合適的方法調(diào)用！");
    }
    try
    {
      object[] parameters = GetParameters(targetInfo.Parameters);
      string data = targetInfo.MethodInfo.Invoke(this, parameters) as string;
      EndRequest(data);
    }
    catch (FormatException)
    {
      EndRequest("參數(shù)類(lèi)型匹配發(fā)生錯(cuò)誤！");
    }
    catch (InvalidCastException)
    {
      EndRequest("參數(shù)類(lèi)型轉(zhuǎn)換發(fā)生錯(cuò)誤！");
    }
    catch (ThreadAbortException)
    {
    }
    catch (Exception e)
    {
      EndRequest(e.Message);
    }
  }
  /// summary>
  /// 獲取函數(shù)元數(shù)據(jù)并緩存
  /// /summary>
  /// param name="methodName">/param>
  /// returns>/returns>
  private CacheMethodInfo TryGetMethodInfo(string methodName)
  {
    Type type = this.GetType().BaseType;
    string cacheKey = type.AssemblyQualifiedName;
    Dictionarystring, CacheMethodInfo> dic = _ajaxTable[cacheKey] as Dictionarystring, CacheMethodInfo>;
    if (dic == null)
    {
      dic = new Dictionarystring, CacheMethodInfo>();
      MethodInfo[] methodInfos = (from m in type.GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.Static)
                    let ma = m.GetCustomAttributes(typeof(AjaxMethodAttribute), false)
                    where ma.Length > 0
                    select m).ToArray();
      foreach (var mi in methodInfos)
      {
        CacheMethodInfo cacheInfo = new CacheMethodInfo();
        cacheInfo.MethodName = mi.Name;
        cacheInfo.MethodInfo = mi;
        cacheInfo.Parameters = mi.GetParameters();
        dic.Add(mi.Name, cacheInfo);
      }
      _ajaxTable.Add(cacheKey, dic);
    }
    CacheMethodInfo targetInfo = null;
    dic.TryGetValue(methodName, out targetInfo);
    return targetInfo;
  }
  /// summary>
  /// 獲取函數(shù)參數(shù)
  /// /summary>
  /// param name="parameterInfos">/param>
  /// returns>/returns>
  private object[] GetParameters(ParameterInfo[] parameterInfos)
  {
    if (parameterInfos == null || parameterInfos.Length = 0)
    {
      return null;
    }
    HttpRequest request = this.Context.Request;
    NameValueCollection nvc = null;
    string requestType = request.RequestType;
    if (string.Compare("GET", requestType, true) == 0)
    {
      nvc = request.QueryString;
    }
    else
    {
      nvc = request.Form;
    }
    int length = parameterInfos.Length;
    object[] parameters = new object[length];
    if (nvc == null || nvc.Count = 0)
    {
      return parameters;
    }
    for (int i = 0; i  length; i++)
    {
      ParameterInfo pi = parameterInfos[i];
      string[] values = nvc.GetValues(pi.Name);
      object value = null;
      if (values != null)
      {
        if (values.Length > 1)
        {
          value = String.Join(",", values);
        }
        else
        {
          value = values[0];
        }
      }
      if (value == null)
      {
        continue;
      }
      parameters[i] = Convert.ChangeType(value, pi.ParameterType);
    }      
    return parameters;
  }
  private void EndRequest(string msg)
  {
    HttpResponse response = this.Context.Response;
    response.Write(msg);
    response.End();
  }
}

public string GetData3(int i, double d, string str)
{
  string[] datas = new string[] { i.ToString(), d.ToString(), str };
  return "參數(shù)分別是：" + String.Join(",", datas);
} 

function getData3(){
  $.ajax({
    headers:{"AjaxFlag":"XHR","MethodName":"GetData3"},
    data:{"i":1,"d":"10.1a","str":"hehe"},
    success:function(data){
      $("#result").text(data);
    }
  });
}