C# .Net MVC3自定义模型绑定器-初始加载模型

我正在创建一个自定义模型绑定器，以便在使用传入值更新模型之前，首先从数据库加载模型。（从DefaultModelBinder继承）

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要执行此操作，我需要覆盖哪个方法？

您需要覆盖

您需要覆盖DefaultModelBinder基类的BindModel方法：

    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        if (bindingContext.ModelType == typeof(YourType))
        {
            var instanceOfYourType = ...; 
            // load YourType from DB etc..

            var newBindingContext = new ModelBindingContext
            {
                ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => instanceOfYourType, typeof(YourType)),
                ModelState = bindingContext.ModelState,
                FallbackToEmptyPrefix = bindingContext.FallbackToEmptyPrefix,
                ModelName = bindingContext.FallbackToEmptyPrefix ? string.Empty : bindingContext.ModelName,
                ValueProvider = bindingContext.ValueProvider,
            };
            if (base.OnModelUpdating(controllerContext, newBindingContext)) // start loading..
            {
                // bind all properties:
                base.BindProperty(controllerContext, bindingContext, TypeDescriptor.GetProperties(typeof(YourType)).Find("Property1", false));
                base.BindProperty(controllerContext, bindingContext, TypeDescriptor.GetProperties(typeof(YourType)).Find("Property2", false));

                // trigger the validators:
                base.OnModelUpdated(controllerContext, newBindingContext);
            }

            return instanceOfYourType;
        }            
        throw new InvalidOperationException("Supports only YourType objects");
    } 

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从数据库加载后是否需要手动绑定每个属性，还是仍然自动绑定？您需要手动绑定每个属性，或者将其委托给基类。