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PostSharp 应用小结

2024-07-11 13:31:37   223人阅读

PostSharp 使用IL静态注入实现AOP，

下面例子对登录操作进行静态注入，使用Web application ,记录每次登录

PostSharp的使用方法很简单，将自定义的属性 LoggerTrace直接加在需要注册的方法上就可以（事件是特殊的方法）

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using PostSharpLogger;namespace PostSharpWebForm.Account{    public partial class Login : Page    {        [LoggerTrace]        protected void Page_Load(object sender, EventArgs e)        {            try            {                RegisterHyperLink.NavigateUrl = "Register";                OpenAuthLogin.ReturnUrl = Request.QueryString["ReturnUrl"];                var returnUrl = HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);                if (!String.IsNullOrEmpty(returnUrl))                {                    RegisterHyperLink.NavigateUrl += "?ReturnUrl=" + returnUrl;                }            }            catch (Exception)            {                throw;            }            finally            {                Response.Write("Hi ^<>^");            }        }        protected void Page_Load2(object sender, EventArgs e)        {            RegisterHyperLink.NavigateUrl = "Register";            OpenAuthLogin.ReturnUrl = Request.QueryString["ReturnUrl"];            var returnUrl = HttpUtility.UrlEncode(Request.QueryString["ReturnUrl"]);            if (!String.IsNullOrEmpty(returnUrl))            {                RegisterHyperLink.NavigateUrl += "?ReturnUrl=" + returnUrl;            }        }    }}

下面是 创建的自定义属性，具体用法可以查看PostSharp的文档

using PostSharp.Aspects;using System;namespace PostSharpLogger{    [Serializable]    public class LoggerTraceAttribute : OnMethodBoundaryAspect    {        public override void OnEntry(MethodExecutionArgs args)        {            WriteLog.Log(string.Format("Before Entering {0}.{1}.", args.Method.DeclaringType.FullName, args.Method.Name));            args.ReturnValue = "http://www.mamicode.com/I‘m onEntry";                    }        public override void OnSuccess(MethodExecutionArgs args)        {            WriteLog.Log(string.Format("Before Entering {0}.{1}.", args.Method.DeclaringType.FullName, args.Method.Name));        }        public override void OnExit(MethodExecutionArgs args)        {            WriteLog.Log(string.Format(" After Entering {0}.{1}.", args.Method.DeclaringType.FullName, args.Method.Name));            args.ReturnValue = http://www.mamicode.com/args.MethodExecutionTag;"Error Entering {0}.{1}.", args.Method.DeclaringType.FullName, args.Method.Name));        }    }}

编译Web application 之后，使用　　ILSpy查看 Web application的DLL

被注入的方法编译后变成：

using PostSharp.Aspects;using PostSharp.Aspects.Internals;using PostSharp.ImplementationDetails_c77a9d44;using System;using System.Reflection;using System.Runtime.CompilerServices;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace PostSharpWebForm.Account{	public class Login : Page	{		protected HyperLink RegisterHyperLink;		protected OpenAuthProviders OpenAuthLogin;		protected void Page_Load(object sender, EventArgs e)		{			MethodExecutionArgs methodExecutionArgs = new MethodExecutionArgs(this, new Arguments<object, EventArgs>			{				Arg0 = sender,				Arg1 = e			});			MethodExecutionArgs arg_27_0 = methodExecutionArgs;			MethodBase  = <>z__a_1._1;			arg_27_0.Method = ;			<>z__a_1.a0.OnEntry(methodExecutionArgs);			if (methodExecutionArgs.FlowBehavior != FlowBehavior.Return)			{				try				{					try					{						this.RegisterHyperLink.NavigateUrl = "Register";						this.OpenAuthLogin.ReturnUrl = base.Request.QueryString["ReturnUrl"];						string returnUrl = HttpUtility.UrlEncode(base.Request.QueryString["ReturnUrl"]);						if (!string.IsNullOrEmpty(returnUrl))						{							HyperLink expr_A4 = this.RegisterHyperLink;							expr_A4.NavigateUrl = expr_A4.NavigateUrl + "?ReturnUrl=" + returnUrl;						}					}					catch (Exception)					{						throw;					}					finally					{						base.Response.Write("Hi ^<>^");					}					<>z__a_1.a0.OnSuccess(methodExecutionArgs);				}				catch (Exception exception)				{					methodExecutionArgs.Exception = exception;					<>z__a_1.a0.OnException(methodExecutionArgs);					switch (methodExecutionArgs.FlowBehavior)					{					case FlowBehavior.Default:					case FlowBehavior.RethrowException:						IL_11E:						throw;					case FlowBehavior.Continue:						methodExecutionArgs.Exception = null;						return;					case FlowBehavior.Return:						methodExecutionArgs.Exception = null;						return;					case FlowBehavior.ThrowException:						throw methodExecutionArgs.Exception;					}					goto IL_11E;				}				finally				{					<>z__a_1.a0.OnExit(methodExecutionArgs);				}			}		}		protected void Page_Load2(object sender, EventArgs e)		{			this.RegisterHyperLink.NavigateUrl = "Register";			this.OpenAuthLogin.ReturnUrl = base.Request.QueryString["ReturnUrl"];			string returnUrl = HttpUtility.UrlEncode(base.Request.QueryString["ReturnUrl"]);			if (!string.IsNullOrEmpty(returnUrl))			{				HyperLink expr_5F = this.RegisterHyperLink;				expr_5F.NavigateUrl = expr_5F.NavigateUrl + "?ReturnUrl=" + returnUrl;			}		}		[CompilerGenerated]		static Login()		{			<>z__a_1.Initialize();		}	}}

　　原有的方法被加载一个try catch 中

 


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