ValidationMessageFor与AddModelError在一起(密钥,消息)。什么关键? [英] ValidationMessageFor together with AddModelError(key, message). Whats the key?
问题描述
我开发一个客户端和服务器端验证了一定的ViewModel属性。
I am developing a client-side and server-side validation for a certain viewModel property.
在我把这个 .cshtml
文件:
@Html.DropDownListFor(model => model.EntityType.ParentId, Model.ParentTypeList, "")
@Html.ValidationMessageFor(model => model.EntityType.ParentId)
在控制器的业务验证
catch (BusinessException e)
{
ModelState.AddModelError("EntityType.ParentId", Messages.CircularReference);
}
如预期上述工程:如果一个异常被捕获,后面会出现一个DropDownList的消息
The above works as expected: if an exception is caught, the message appears next to the dropdownlist.
不过,我觉得这种方式不是很优雅。在 CSHTML
,我用一个方法来产生所有有关验证所需的信息。在控制器中,我必须知道确切的密钥字符串,并使用它。
However, I find that this way is not very elegant. In the cshtml
, I use a method to generate all the required information about the validation. In the controller, I must know the exact Key string and use it.
是不是有这样做的更好的办法?
Isn't there a better way of doing this?
感谢您。
推荐答案
您可以写,将采取一个lambda前pression的关键,而不是一个字符串的扩展方法:
You could write an extension method that will take a lambda expression for the key instead of a string:
public static class ModelStateExtensions
{
public static void AddModelError<TModel, TProperty>(
this ModelStateDictionary modelState,
Expression<Func<TModel, TProperty>> ex,
string message
)
{
var key = ExpressionHelper.GetExpressionText(ex);
modelState.AddModelError(key, message);
}
}
,然后用这个方法:
and then use this method:
catch (BusinessException e)
{
ModelState.AddModelError<MyViewModel, int>(
x => x.EntityType.ParentId,
Messages.CircularReference
);
}
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