Asp.Net MVC Exploring Controllers in-depth Part 8 – Bestdotnettraining

Cancelling Filter Execution

You can cancel filter execution in the OnActionExecuting methods by setting the Result property to a non-null value.

Any pending OnActionExecuted and OnActionExecuting filters will not be invoked
Invoker will not call the OnActionExecuted method for the cancelled filter or for pending
The OnActionExecuted filter for previously run filters will
All of the OnResultExecuting and OnResultExecuted filters will

You can cancel filter execution in the OnResultExecuting methods by setting the Cancel property.

Any pending OnResultExecuted and OnResultExecuting are cancelled and blank o/p is rendered to the browser.
The OnResultExecuted filter for previously run filters will run.

public class Log2Attribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
//filterContext.Result = new EmptyResult();
Trace("On Action Executing", filterContext.RouteData);
}
{
Trace("On Action Executed", filterContext.RouteData);
}
{
filterContext.Cancel = true;
 
}
{
 
}
 
string str = string.Format("2 - Method Name={0}, Controller Name={1}, Action={2}", methodName, colName, actionName);
System.Diagnostics.Trace.WriteLine(str); 
HttpContext.Current.Response.Write("<br>" + str + "<br>");
}
 }

public class Log2Attribute : ActionFilterAttribute

{

public override void OnActionExecuting(ActionExecutingContext filterContext)

{

//filterContext.Result = new EmptyResult();

Trace("On Action Executing", filterContext.RouteData);

}

{

Trace("On Action Executed", filterContext.RouteData);

}

{

filterContext.Cancel = true;

}

{

}

string str = string.Format("2 - Method Name={0}, Controller Name={1}, Action={2}", methodName, colName, actionName);

System.Diagnostics.Trace.WriteLine(str);

HttpContext.Current.Response.Write("<br>" + str + "<br>");

}

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