概述

---

  本文已经同步到《 》中]

 IValueProvider

根据ValueProvider获取数据，在对数据进行绑定

代码实现

 

---

 

private class CustomValueProvider : IValueProvider            {            //判断否具有指定的前缀            public Task
     
       ContainsPrefixAsync(string prefix)                {                var result = string.Equals(prefix, "test", StringComparison.OrdinalIgnoreCase);                return Task.FromResult(result);                }            //返回ValueProviderResult            public Task
      
        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
     
      ();            services.AddCaching();            services.AddSession();            services.AddMvc()                    .Configure
      
       (options =>                    {
    //添加CustomValueProviderFactory                        options.ValueProviderFactories.Insert(1, new CustomValueProviderFactory());                    });            }