ASP.NET C# 捕获类中的所有异常

我知道这不是正确的做法，而且根本不干净。我只是想知道这是否可能。

如果我有一个包含很多方法的类

public class Foo {

   methodA() {}

   methodB() {}

   methodC() {}

}

是否可以捕获所有可能发生的异常，而不必在每个方法中编写 try/catch？

是的。最简单的方法是为此类添加一个属性，如下所示：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public class HandleErrorAttribute : FilterAttribute, IExceptionFilter
{

    public void OnException(ExceptionContext filterContext)
    {
        if (filterContext == null)
        {
            throw new ArgumentNullException("filterContext");
        }

        if (filterContext.ExceptionHandled)
        {
            return;
        }

        var exception = filterContext.Exception;

        // that need to be your current request object. In this case I use a custom one so I must fetch it from the items collection of the current request, where I had stored it before.
        var request = filterContext.HttpContext.Items[Request.RequestKey] as Request;

        if (request != null)
        {
            // overwrite ErrorResponse with a response object of your choice or write directly to the filterContext.HttpContext.Response
            var errorResponse = new ErrorResponse(request, exception); 
            errorResponse.Write(filterContext.HttpContext.Response);
            filterContext.ExceptionHandled = true;
        }
    }
}

// Or a just slightly modified version of the default ASP.Net MVC HandleError Attribute
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]
    public class CustomHandleErrorAttribute : FilterAttribute, IExceptionFilter
    {
        // Fields
        private const string _defaultView = "Error";
        private string _master;
        private readonly object _typeId = new object();
        private string _view;

        // Methods
        public virtual void OnException(ExceptionContext filterContext)
        {
            if (filterContext == null)
            {
                throw new ArgumentNullException("filterContext");
            }
            if (!filterContext.IsChildAction && (!filterContext.ExceptionHandled && filterContext.HttpContext.IsCustomErrorEnabled))
            {
                Exception innerException = filterContext.Exception;
                if ((new HttpException(null, innerException).GetHttpCode() == 500))
                {
                    string controllerName = (string)filterContext.RouteData.Values["controller"];
                    string actionName = (string)filterContext.RouteData.Values["action"];
                    HandleErrorInfo model = new HandleErrorInfo(filterContext.Exception, controllerName, actionName);
                    ViewResult result = new ViewResult();
                    result.ViewName = this.View;
                    result.MasterName = this.Master;
                    result.ViewData = new ViewDataDictionary<HandleErrorInfo>(model);
                    result.TempData = filterContext.Controller.TempData;
                    filterContext.Result = result;
                    filterContext.ExceptionHandled = true;
                    filterContext.HttpContext.Response.Clear();
                    filterContext.HttpContext.Response.StatusCode = 500;
                    filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
                }
            }
        }

        public string Master
        {
            get
            {
                return (this._master ?? string.Empty);
            }
            set
            {
                this._master = value;
            }
        }

        public override object TypeId
        {
            get
            {
                return this._typeId;
            }
        }

        public string View
        {
            get
            {
                if (string.IsNullOrEmpty(this._view))
                {
                    return "Error";
                }
                return this._view;
            }
            set
            {
                this._view = value;
            }
        }
    }

Usage （未经测试，因为我在已经实现所有必需接口的控制器上下文中使用它）

[HandleErrorAttribute]
public class Foo : IExceptionFilter // (I am not sure about this one IActionFilter)
{

    public void MethodA() 
    {
        // body
    }

    public void MethodB() 
    {
        // body
    }

    public void MethodC()
    {
        // body
    }

}

或者你可以这样做：

public class ExecuteHelper
{
    public static void Catch(Action action)
    {
        try
        {
            action();
        }
        catch (Exception ex)
        {
            // Do what you want
        }
    }
}

并在函数体中使用它：

public void Foo(string something)
{
    ExecuteHelper.Catch(() =>
    {
        // Do something with something or without something
    });
}