Asp.net MVC 对用户输入的字符串做Trim处置惩罚的要领实例【C#.Net教程】,Asp.net,Trim,字符串,输入,用户

这篇文章重要引见了Asp.net MVC 怎样对一切用户输入的字符串字段做Trim处置惩罚,须要的朋侪能够参考下

常常须要对用户输入的数据在插进去数据库或许推断之前做Trim处置惩罚，针对每一个ViewModel的字段各自做处置惩罚是我们平常的主意。近来观察发明实在也能够一次性完成的。

MVC4.6中完成体式格局

1，完成IModelBinder接口,建立自定义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，增加ModelBinder到MVC的绑定库。

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，确认一下结果

将暗码背面的空格做Trim处置惩罚，绑定到ViewModel的时刻变成1了：

Asp.net core 1.1 MVC中完成体式格局

1,自定义ModelBinder并继续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,为ModelBinder增加自定义Provider

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增加到绑定治理库

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

4,确认一下结果