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This article mainly introduces how Asp.net MVC trims all string fields entered by users. Friends in need can refer to
It is often necessary to trim the data entered by the user before inserting it into the data library or making a judgment. It is our general idea to process each ViewModel field separately. Recent investigations have revealed that it can actually be achieved in one go.
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();
}
}
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); }
Trim the space after the password and bind it When it comes to ViewModel, it becomes 1:
##Asp.net core 1.1 MVC implementation method
1, customize ModelBinder andinherit
ComplexTypeModelBinderpublic 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 to 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, add Provider to the binding Customize the management library
services.AddMvc().AddMvcOptions(s => { s.ModelBinderProviders[s.ModelBinderProviders.TakeWhile(p => !(p is ComplexTypeModelBinderProvider)).Count()] = new TrimModelBinderProvider(); });4, confirm the effect
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