MVC 2的UpdateModel在接口上，应该ModelBinderAttribute被忽略？ [英] MVC 2 UpdateModel on Interface, Should ModelBinderAttribute be ignored?
本文介绍了MVC 2的UpdateModel在接口上，应该ModelBinderAttribute被忽略？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有形式从一个特定的抽象类的实例发布数据：
公共抽象类IRestriction
{
公共字符串名称{;组;}
公共抽象IModelBinder GetBinder（）;
}
具体类型和PartialView在运行时确定：
IRestriction限制=（IRestriction）Activator.CreateInstance（Type.GetType（restriction.restriction_class））;
适当的局部视图，然后正确呈现。
当的形式发回的类型正确地推断并激活的方法相同。
不过，我一直无法获得的UpdateModel绑定到具体实施。
我如何模型绑定到具体类型而不是接口？
事情我已经试过：
我已经设置ModelBinderAttribute在具体的类，但它被忽略。
[ModelBinder的（typeof运算（MyCustomModelBinder））]
公共类ConcreteRestriction：IRestriction
我已经清除了所有的ModelBinders并从接口只添加粘合剂。
Binders.Clear（）;
Binders.Add（item.GetType（），item.GetBinder（））;
这些都不是工作。
最新最好的方式来完成我想要做什么？
时ModelBinderAttribute被错误的忽视？
** ----------------------更新---------------------- **
下面是其他任何人与谁发生过这个运行同样的问题挣扎的解决方案。
下面的类继承控制器。继承它，并调用UpdateModelDynamic（）/ TryUpdateModelDynamic（）
公共类DynamicTypeController：控制器
{
内部静态布尔IsPropertyAllowed（字符串propertyName的，字符串[] includeProperties，字符串[] excludeProperties）
{
//我们允许一个属性如果双方在包括列表中，而不是在排除列表的约束。
//空包括列表意味着所有属性都是允许的。
//空排除列表意味着没有任何属性是不允许的。
布尔includeProperty =（includeProperties == NULL）|| （includeProperties.Length == 0）|| includeProperties.Contains（propertyName的，StringComparer.OrdinalIgnoreCase）;
布尔excludeProperty =（excludeProperties！= NULL）及和放大器; excludeProperties.Contains（propertyName的，StringComparer.OrdinalIgnoreCase）;
返回includeProperty＆放大器;＆安培; ！excludeProperty;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型），其中的TModel：类
{
返回TryUpdateModelDynamic（型号，NULL，NULL，NULL，ValueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，preFIX，NULL，NULL，ValueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型的String [] includeProperties）其中的TModel：类
{
返回TryUpdateModelDynamic（模型，空，includeProperties，空，ValueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，preFIX，includeProperties，空，ValueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，字符串[] excludeProperties）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，preFIX，includeProperties，excludeProperties，ValueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，IValueProvider valueProvider）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，NULL，NULL，NULL，valueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，IValueProvider valueProvider）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，preFIX，NULL，NULL，valueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型的String [] includeProperties，IValueProvider valueProvider）其中的TModel：类
{
返回TryUpdateModelDynamic（模型，空，includeProperties，空，valueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，IValueProvider valueProvider）其中的TModel：类
{
返回TryUpdateModelDynamic（型号，preFIX，includeProperties，空，valueProvider）;
} 受保护的内部布尔TryUpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，字符串[] excludeProperties，IValueProvider valueProvider）其中的TModel：类
{
如果（型号== NULL）
{
抛出新的ArgumentNullException（模式）;
}
如果（valueProvider == NULL）
{
抛出新的ArgumentNullException（valueProvider）;
} predicate＆LT;串GT; propertyFilter = propertyName的= GT; IsPropertyAllowed（propertyName的，includeProperties，excludeProperties）;
IModelBinder粘合剂= Binders.GetBinder（model.GetType（））; ModelBindingContext的BindingContext =新ModelBindingContext（）
{
ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType（（）=＆GT;模型，model.GetType（）），
MODELNAME = preFIX，
的ModelState =的ModelState，
PropertyFilter = propertyFilter，
ValueProvider = valueProvider
};
binder.BindModel（ControllerContext，BindingContext中）;
返回ModelState.IsValid;
}
受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型），其中的TModel：类
{
UpdateModelDynamic（型号，NULL，NULL，NULL，ValueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX）其中的TModel：类
{
UpdateModelDynamic（型号，preFIX，NULL，NULL，ValueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型的String [] includeProperties）其中的TModel：类
{
UpdateModelDynamic（模型，空，includeProperties，空，ValueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties）其中的TModel：类
{
UpdateModelDynamic（型号，preFIX，includeProperties，空，ValueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，字符串[] excludeProperties）其中的TModel：类
{
UpdateModelDynamic（型号，preFIX，includeProperties，excludeProperties，ValueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，IValueProvider valueProvider）其中的TModel：类
{
UpdateModelDynamic（型号，NULL，NULL，NULL，valueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，IValueProvider valueProvider）其中的TModel：类
{
UpdateModelDynamic（型号，preFIX，NULL，NULL，valueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型的String [] includeProperties，IValueProvider valueProvider）其中的TModel：类
{
UpdateModelDynamic（模型，空，includeProperties，空，valueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，IValueProvider valueProvider）其中的TModel：类
{
UpdateModelDynamic（型号，preFIX，includeProperties，空，valueProvider）;
} 受保护的内部空隙UpdateModelDynamic＆LT;＆的TModel GT;（的TModel模型，字符串preFIX，字符串[] includeProperties，字符串[] excludeProperties，IValueProvider valueProvider）其中的TModel：类
{
BOOL成功= TryUpdateModelDynamic（型号，preFIX，includeProperties，excludeProperties，valueProvider）;
如果（！成功）
{
字符串消息=的String.Format（类型的模型{0}无法更新。model.GetType（）全名）;
抛出新的InvalidOperationException异常（消息）;
}
}}
解决方案
<一个href=\"https://connect.microsoft.com/VisualStudio/feedback/details/483001/in-asp-net-mvc-generic-try-updatemodel-methods-ignore-subtype-properties\"相对=nofollow>我认为这是一个错误，但在ASP.NET MVC团队不同意。模型绑定着眼于静态，编译时模型的类型。我不喜欢它，但是这是怎么回事。
I have forms posting data from instances of a particular abstract class:
public abstract class IRestriction
{
public string Name {get; set;}
public abstract IModelBinder GetBinder();
}
The concrete type and PartialView are determined at runtime:
IRestriction restriction = (IRestriction)Activator.CreateInstance(Type.GetType(restriction.restriction_class));
The appropriate partial view is then rendered correctly.
When the form is sent back the type is inferred correctly and activated the same way.
However, I haven't been able to get UpdateModel to bind to the concrete implementation.
How do I get the Model to bind to the concrete type instead of the interface?
Things I've tried:
I've set the ModelBinderAttribute on the concrete class but it is being ignored.
[ModelBinder(typeof(MyCustomModelBinder))]
public class ConcreteRestriction : IRestriction
I've cleared all the ModelBinders and added only the binder from the interface.
Binders.Clear();
Binders.Add(item.GetType(), item.GetBinder());
None of these is working.
Whats the best way to accomplish what I'm trying to do?
Is ModelBinderAttribute being ignored in error?
** ----------------------UPDATE----------------------**
Here is a solution for anyone else struggling with the same issue who happens to run across this.
The following class inherits Controller. Inherit it and call UpdateModelDynamic()/TryUpdateModelDynamic()
public class DynamicTypeController : Controller
{
internal static bool IsPropertyAllowed(string propertyName, string[] includeProperties, string[] excludeProperties)
{
// We allow a property to be bound if its both in the include list AND not in the exclude list.
// An empty include list implies all properties are allowed.
// An empty exclude list implies no properties are disallowed.
bool includeProperty = (includeProperties == null) || (includeProperties.Length == 0) || includeProperties.Contains(propertyName, StringComparer.OrdinalIgnoreCase);
bool excludeProperty = (excludeProperties != null) && excludeProperties.Contains(propertyName, StringComparer.OrdinalIgnoreCase);
return includeProperty && !excludeProperty;
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model) where TModel : class
{
return TryUpdateModelDynamic(model, null, null, null, ValueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix) where TModel : class
{
return TryUpdateModelDynamic(model, prefix, null, null, ValueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string[] includeProperties) where TModel : class
{
return TryUpdateModelDynamic(model, null, includeProperties, null, ValueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties) where TModel : class
{
return TryUpdateModelDynamic(model, prefix, includeProperties, null, ValueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, string[] excludeProperties) where TModel : class
{
return TryUpdateModelDynamic(model, prefix, includeProperties, excludeProperties, ValueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, IValueProvider valueProvider) where TModel : class
{
return TryUpdateModelDynamic(model, null, null, null, valueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix, IValueProvider valueProvider) where TModel : class
{
return TryUpdateModelDynamic(model, prefix, null, null, valueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string[] includeProperties, IValueProvider valueProvider) where TModel : class
{
return TryUpdateModelDynamic(model, null, includeProperties, null, valueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, IValueProvider valueProvider) where TModel : class
{
return TryUpdateModelDynamic(model, prefix, includeProperties, null, valueProvider);
}
protected internal bool TryUpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, string[] excludeProperties, IValueProvider valueProvider) where TModel : class
{
if (model == null)
{
throw new ArgumentNullException("model");
}
if (valueProvider == null)
{
throw new ArgumentNullException("valueProvider");
}
Predicate<string> propertyFilter = propertyName => IsPropertyAllowed(propertyName, includeProperties, excludeProperties);
IModelBinder binder = Binders.GetBinder(model.GetType());
ModelBindingContext bindingContext = new ModelBindingContext()
{
ModelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => model, model.GetType()),
ModelName = prefix,
ModelState = ModelState,
PropertyFilter = propertyFilter,
ValueProvider = valueProvider
};
binder.BindModel(ControllerContext, bindingContext);
return ModelState.IsValid;
}
protected internal void UpdateModelDynamic<TModel>(TModel model) where TModel : class
{
UpdateModelDynamic(model, null, null, null, ValueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix) where TModel : class
{
UpdateModelDynamic(model, prefix, null, null, ValueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string[] includeProperties) where TModel : class
{
UpdateModelDynamic(model, null, includeProperties, null, ValueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties) where TModel : class
{
UpdateModelDynamic(model, prefix, includeProperties, null, ValueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, string[] excludeProperties) where TModel : class
{
UpdateModelDynamic(model, prefix, includeProperties, excludeProperties, ValueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, IValueProvider valueProvider) where TModel : class
{
UpdateModelDynamic(model, null, null, null, valueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix, IValueProvider valueProvider) where TModel : class
{
UpdateModelDynamic(model, prefix, null, null, valueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string[] includeProperties, IValueProvider valueProvider) where TModel : class
{
UpdateModelDynamic(model, null, includeProperties, null, valueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, IValueProvider valueProvider) where TModel : class
{
UpdateModelDynamic(model, prefix, includeProperties, null, valueProvider);
}
protected internal void UpdateModelDynamic<TModel>(TModel model, string prefix, string[] includeProperties, string[] excludeProperties, IValueProvider valueProvider) where TModel : class
{
bool success = TryUpdateModelDynamic(model, prefix, includeProperties, excludeProperties, valueProvider);
if (!success)
{
string message = String.Format("The model of type '{0}' could not be updated.", model.GetType().FullName);
throw new InvalidOperationException(message);
}
}
}
解决方案
I think it's a bug, but the ASP.NET MVC team disagrees. Model binding looks at the static, compile-time type of the model. I don't like it, but that's how it is.
这篇关于MVC 2的UpdateModel在接口上，应该ModelBinderAttribute被忽略？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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