public IModelBinder DefaultBinder{    get    {        if (this._defaultBinder == null)        {            this._defaultBinder = new DefaultModelBinder();        }        return this._defaultBinder;    }    set    {        this._defaultBinder = value;    }}

public class DefaultModelBinder : IModelBinder{　　　　public virtual object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext){}//其他方法我们暂时不分心，不止这一个方法}

public virtual object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext){            EnsureStackHelper.EnsureStack();            if (bindingContext == null)            {                throw new ArgumentNullException("bindingContext");            }            bool flag = false;            if (!string.IsNullOrEmpty(bindingContext.ModelName) && !bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))            {//ValueProvider是一个IValueProvider的实例，我们下面分析一下这个东西                if (!bindingContext.FallbackToEmptyPrefix)                {                    return null;                }                bindingContext = new ModelBindingContext                {                    ModelMetadata = bindingContext.ModelMetadata,                    ModelState = bindingContext.ModelState,                    PropertyFilter = bindingContext.PropertyFilter,                    ValueProvider = bindingContext.ValueProvider                };                flag = true;            }            if (!flag)            {                bool flag2 = DefaultModelBinder.ShouldPerformRequestValidation(controllerContext, bindingContext);                IUnvalidatedValueProvider arg_9B_0 = bindingContext.UnvalidatedValueProvider;                bool skipValidation = !flag2;                ValueProviderResult value = arg_9B_0.GetValue(bindingContext.ModelName, skipValidation);                if (value != null)                {                    return this.BindSimpleModel(controllerContext, bindingContext, value);                }            }            if (!bindingContext.ModelMetadata.IsComplexType)            {                return null;            }            return this.BindComplexModel(controllerContext, bindingContext);}

    public interface IValueProvider    {        /// <summary>Determines whether the collection contains the specified prefix.</summary>        /// <returns>true if the collection contains the specified prefix; otherwise, false.</returns>        /// <param name="prefix">The prefix to search for.</param>        bool ContainsPrefix(string prefix);        /// <summary>Retrieves a value object using the specified key.</summary>        /// <returns>The value object for the specified key.</returns>        /// <param name="key">The key of the value object to retrieve.</param>        ValueProviderResult GetValue(string key);    }