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(, new CustomValueProviderFactory());

                    });

            }