Asp.net Vnext IValueProvider

概述

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  本文已经同步到《Asp.net Vnext 系列教程 》中]

 IValueProvider

根据ValueProvider获取数据，在对数据进行绑定

代码实现

 

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  private class CustomValueProvider : IValueProvider
            {

            //判断否具有指定的前缀
            public Task<bool> ContainsPrefixAsync(string prefix)
                {
                var result = string.Equals(prefix, "test", StringComparison.OrdinalIgnoreCase);
                return Task.FromResult(result);
                }

            //返回ValueProviderResult
            public Task<ValueProviderResult> GetValueAsync(string key)
                {
                
                //进行绑定的值
                var value = "custom-value-provider-value";
                var result = new ValueProviderResult(value, value, CultureInfo.CurrentCulture);
                return Task.FromResult(result);
                }
            }

 

  ValueProvider工厂

 

    public IValueProvider GetValueProvider(ValueProviderFactoryContext context)
            {
            if (context.HttpContext.Request.Path.Value.Contains("TestValueProvider"))
                {
                return new CustomValueProvider();
                }

            return null;
            }

控制器

 public class HomeController
        {
        public string TestValueProvider(string test)
            {
            return test;
            }

  
        }

启动类

   public class Startup
    {
        // For more information on how to configure your application, visit http://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
            {

            services.AddSingleton<IMemoryCache, MemoryCache>();

            services.AddCaching();
            services.AddSession();

            services.AddMvc()
                    .Configure<MvcOptions>(options =>

                    {//添加CustomValueProviderFactory
                        options.ValueProviderFactories.Insert(1, new CustomValueProviderFactory());
                    });
            }