An example of an ASP. NET mvc exception handling method is presented

1. The first class to save the exception (that is, to write the exception information to a file)

 
public class LogManager 
{ 
private string logFilePath = string.Empty; 
public LogManager(string logFilePath) 
{ 
this.logFilePath = logFilePath; 
FileInfo file = new FileInfo(logFilePath); 
if (!file.Exists) 
{ 
file.Create().Close(); 
} 
} 
public void SaveLog(string message, DateTime writerTime) 
{ 
string log = writerTime.ToString() + ":" + message; 
StreamWriter sw = new StreamWriter(logFilePath, true); 
sw.WriteLine(log); 
sw.Close(); 
} 
} 

2. Controller exception handling

This approach simply overrides the OnException () method in controller, which requires exception handling, because it inherits the IExceptionFilter interface

 
public class ExceptionController : Controller 
{ 
public ActionResult Index() 
{ 
throw new Exception(" I threw an exception! "); 
} 
protected override void OnException(ExceptionContext filterContext) 
{ 
string filePath = Server.MapPath("~/Exception . txt"); 
StreamWriter sw = System.IO.File.AppendText(filePath); 
sw.WriteLine(DateTime.Now.ToString() + ":" + filterContext.Exception.Message); 
sw.Close(); 
base.OnException(filterContext); 
Redirect("/"); 
} 
} 

3. Filter exception handling

 
namespace MyMVC.Controllers 
{ 
public class ExceptionController : Controller 
{ 
[Error] 
public ActionResult Index() 
{ 
throw new Exception(" Filter exception! "); 
} 
} 
} 
public class ErrorAttribute : HandleErrorAttribute 
{ 
public override void OnException(ExceptionContext filterContext) 
{ 
base.OnException(filterContext); 
string path = filterContext.HttpContext.Server.MapPath("~/Exception.txt"); 
StreamWriter sw = System.IO.File.AppendText(path); 
sw.WriteLine(DateTime.Now.ToString()+":"+filterContext.Exception.Message); 
sw.Close(); 
} 
}