現在的企業級開發項目,特別是網站一般都會用到log功能,想想大部分會用Enterprise Logging Application Block 的功能 或者自己寫一個組件,記錄系統日誌事件,更好的跟蹤瞭解系統運行情況, 現用ASP.NET MVC 的過濾屬性實現log功能!
ASP.NET MVC的filter 是一個屬性,可以應用到controller 後者action.當Controller或者action method 被調用時,ASP.NET MVC的filter在調用執行前後會被觸發。 先看下當Control 裡面的action 被調用時的利用繼承,自訂類log的:
要實現上面的效果,現自訂一個類LogMessageAttribute,LogMessageAttribute繼承介面IActionFilter ,IResultFilter,也可以選擇性的繼承重寫類FilterAttribute。
IActionFilter interface 定義為:
public interface IActionFilter
{
// Methods
void OnActionExecuted(ActionExecutedContext filterContext);
void OnActionExecuting(ActionExecutingContext filterContext);
}
OnActionExecuting :在Controller 裡面的action method 調用之前運行
OnActionExecuted:在Controller 裡面的action method 調用之後運行,但是在IResultFilter介面的OnResultExecuting方法執行之前
IResultFilter interface定義為:
public interface IResultFilter
{
// Methods
void OnResultExecuted(ResultExecutedContext filterContext);
void OnResultExecuting(ResultExecutingContext filterContext);
}
OnResultExecuting:在Controller 裡面的action method調用處理玩前執行.
OnResultExecuted:在Controller 裡面的action method調用處理玩後執行.
接下來是重頭戲:LogMessageAttribute自訂類
代碼
[AttributeUsage(AttributeTargets.Class |AttributeTargets.Method ,Inherited=true ,AllowMultiple=true )]
public class LogMessageAttribute:FilterAttribute,IActionFilter,IResultFilter
{
/// <summary>
/// <param name="LogName ">記錄檔路徑</para>
/// </summary>
public string LogName { get; set; }
/// <summary>
/// 記錄時間,系統版本,當前線程ID 等記錄
/// </summary>
/// <param name="controller"></param>
/// <param name="action"></param>
/// <param name="message"></param>
public void LogMessage(string controller, string action, string message)
{
if (!string.IsNullOrEmpty(LogName))
{
TextWriter writer = new StreamWriter(LogName, true);
writer.WriteLine("################# Begin #################");
writer.WriteLine("Time:[{0}]",DateTime.Now.ToString("yyyy-MM-dd- hh:mm:ss"));
writer.WriteLine("Controller:{0}",controller);
writer.WriteLine("Action:{0}",action);
writer.WriteLine("Message:{0}",message);
writer.WriteLine("Operating System version is:{0}",System.Environment.OSVersion.Version.ToString());
writer.WriteLine("Current Thread ID is:{0}",AppDomain.GetCurrentThreadId());
writer.WriteLine("############### Over ###############");
writer.Close();
}
}
public void OnActionExecuting(ActionExecutingContext filterContext)
{
LogMessage(filterContext.RouteData.Values["controller"].ToString(),
filterContext.RouteData.Values["action"].ToString(),
"Action exeuting...");
}
public void OnActionExecuted(ActionExecutedContext filterContext)
{
LogMessage(filterContext.RouteData.Values["controller"].ToString(),
filterContext.RouteData.Values["action"].ToString(),
"Action executed.");
}
public void OnResultExecuting(ResultExecutingContext filterContext)
{
LogMessage(filterContext.RouteData.Values["controller"].ToString(),
filterContext.RouteData.Values["action"].ToString(),
"Result executing...");
}
public void OnResultExecuted(ResultExecutedContext filterContext)
{
LogMessage(filterContext.RouteData.Values["controller"].ToString(),
filterContext.RouteData.Values["action"].ToString(),
"Result executed");
}
}
自訂好LogMessageAttribute類,應用到Controller或者action的屬性。在Controller 正在執行,或者呈現一個View,一個HTTP請求資料時,就會在記錄檔記錄一些日誌.
在項目的Controller裡面應用自訂的屬性
代碼
[Logging(LogName = @"D:\Project\Project\MVCProject\sky.ExtendMVCFramework\sky.ExtendMVCFramework\Log.log")]
public ActionResult DesplayEmployee()
{
ViewData["Message"] = "Our employees welcome you to our site!";
List<Employee> employees = new List<Employee>
{
new Employee {
FirstName="sky",
LastName="yang",
Email = "weflytotti@163.com",
Department ="Development"
},
new Employee {
FirstName="sky",
LastName="yang",
Email = "weflytotti@163.com",
Department ="Development"
}
};
return View(employees);
}
運行程式,正如文章開始所看到的!
總結:自訂ASP.NET MVC 的過濾屬性實現自己想要的功能只需要繼承IActionFilter ,IResultFilter。