MVC extension Modelbinder enables a datetime-type action parameter to receive a date-formatted string

Original: MVC extension Modelbinder enables a datetime-type action parameter to receive a date-formatted string

How do I get a view to put a date-formatted string into a route and pass it to a controller method parameter of type DateTime in some way? That is string→datetime. The MVC default Modelbinder does not provide such a mechanism, so we want to customize a modelbinder.

First, in the foreground view, assign a date-formatted string to the date variable in the route:

@Html. ActionLink ("Incoming date format is 2014-06-19","date",new"2014-06-19"})

In the Controller method, you want to receive the date variable as follows:

 Public ActionResult Date (DateTime date)        {            viewdata["date"] = date;             return View ();        }

The custom Modelbinder implements the Imodelbinder interface:

usingSystem;usingSYSTEM.WEB.MVC;namespacemvcapplication1.extension{ Public classDatetimemodelbinder:imodelbinder { Public stringFormat {Get;Private Set; }  PublicDatetimemodelbinder (stringformat) {             This. Format =format; }         Public ObjectBindmodel (ControllerContext controllercontext, Modelbindingcontext bindingcontext) {//from Valueprovider, the model name is key, which gets the value of the model            varValue =BindingContext.ValueProvider.GetValue (bindingcontext.modelname); returnDateTime.ParseExact ((string) value. Attemptedvalue, This. Format,NULL); }    }}

Above, through the constructor injection format, through the use of the property format, in the Bindmodel () method to remove the value in the Valueprovider, and then converted to a datetime type.

The next question is: How can DateTime date be used to customize the Modelbinder? To do this, we need a class derived from Custommodelbinderattribute, overriding the Getbinder () method of Custommodelbinderattribute.

usingSYSTEM.WEB.MVC;namespacemvcapplication1.extension{ Public classDatetimeattribute:custommodelbinderattribute { Public stringFormat {Get;Private Set; }  PublicDatetimeattribute (stringformat) {             This. Format =format; }         Public OverrideImodelbinder Getbinder () {return NewDatetimemodelbinder ( This.        Format); }    }}

Then hit the datetimeattribute on the controller method parameter:

 Public ActionResult Date ([DateTime ("yyyy-mm-dd")]datetime date)        {            viewdata[ " Date "] = date;             return View ();        }

As a result, you can eventually use the datetime type from the Controller method in the ViewData in the view:

@{    var date = (DateTime) viewdata["date";} <span> the Date Received is:</span><span> @date. ToShortDateString () </span>