How to Trim the input string field by Asp.net MVC

This article will explain in detail how Asp.net MVC does Trim processing on the input string fields. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Implementation method in MVC4.6

1. Implement the IModelBinder interface and create a custom ModelBinder.

Public class TrimModelBinder: IModelBinder {public object BindModel (ControllerContext controllerContext, ModelBindingContext bindingContext) {var valueResult = bindingContext.ValueProvider.GetValue (bindingContext.ModelName); string attemptedValue = valueResult?.AttemptedValue; return string.IsNullOrWhiteSpace (attemptedValue)? AttemptedValue: attemptedValue.Trim ();}}

2. Add ModelBinder to the binding library of MVC.

Protected void Application_Start () {/ / System.Web.Mvc.ModelBinders.Binders.DefaultBinder = new ModelBinders.TrimModelBinder (); System.Web.Mvc.ModelBinders.Binders.Add (typeof (string), new ModelBinders.TrimModelBinder ()); AreaRegistration.RegisterAllAreas (); FilterConfig.RegisterGlobalFilters (GlobalFilters.Filters); RouteConfig.RegisterRoutes (RouteTable.Routes); BundleConfig.RegisterBundles (BundleTable.Bundles);}

3. Confirm the effect.

Trim the space after the password. When binding to ViewModel, it becomes 1:

Implementation in Asp.net core 1.1 MVC

1, customize ModelBinder and inherit ComplexTypeModelBinder

Public class TrimModelBinder: ComplexTypeModelBinder {public TrimModelBinder (IDictionary propertyBinders): base (propertyBinders) {} protected override void SetProperty (ModelBindingContext bindingContext, string modelName, ModelMetadata propertyMetadata, ModelBindingResult result) {var value = result.Model as string; result= string.IsNullOrWhiteSpace (value)? Result: ModelBindingResult.Success (value.Trim ()); base.SetProperty (bindingContext, modelName, propertyMetadata, result);}}

2, add a custom Provider for ModelBinder

Public class TrimModelBinderProvider: IModelBinderProvider {public IModelBinder GetBinder (ModelBinderProviderContext context) {if (context.Metadata.IsComplexType & &! context.Metadata.IsCollectionType) {var propertyBinders = new Dictionary (); for (int I = 0; I

< context.Metadata.Properties.Count; i++) { var property = context.Metadata.Properties[i]; propertyBinders.Add(property, context.CreateBinder(property)); } return new TrimModelBinder(propertyBinders); } return null; } } 3,将Provider添加到绑定管理库 services.AddMvc().AddMvcOptions(s =>

{s.ModelBinderProviders [s.ModelBinderProviders.TakeWhile (p = >! (p is ComplexTypeModelBinderProvider)) .Count ()] = new TrimModelBinderProvider ();})

4. Confirm the effect.

Trim the space after the password. When binding to ViewModel, it becomes 1:

This is the end of the article on "Asp.net MVC how to Trim the input string fields". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it out for more people to see.