Asp.net mvc 3 内部模型的自定义模型绑定器
我有一个这样的模型:Asp.net mvc 3 内部模型的自定义模型绑定器,asp.net-mvc-3,asp.net-mvc-2,custom-model-binder,custom-binding,Asp.net Mvc 3,Asp.net Mvc 2,Custom Model Binder,Custom Binding,我有一个这样的模型: public class MainModel { public string Id {get;set;} public string Title {get;set;} public TimePicker TimePickerField {get;set;} } public class TimePicker { public TimeSpan {get;set;} public AmPmEnum AmPm {get;set;} } var
public class MainModel
{
public string Id {get;set;}
public string Title {get;set;}
public TimePicker TimePickerField {get;set;}
}
public class TimePicker
{
public TimeSpan {get;set;}
public AmPmEnum AmPm {get;set;}
}
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
TimePicker
是一个内部模型,如下所示:
public class MainModel
{
public string Id {get;set;}
public string Title {get;set;}
public TimePicker TimePickerField {get;set;}
}
public class TimePicker
{
public TimeSpan {get;set;}
public AmPmEnum AmPm {get;set;}
}
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
我正在尝试为内部模型创建自定义模型绑定:TimePicker
问题是:如何在自定义模型活页夹中获取值,该活页夹以TimePicker
model字段的形式提交
如果我试着这样做:
public class MainModel
{
public string Id {get;set;}
public string Title {get;set;}
public TimePicker TimePickerField {get;set;}
}
public class TimePicker
{
public TimeSpan {get;set;}
public AmPmEnum AmPm {get;set;}
}
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
我只是在值中得到null
我不知道如何正确地实现模型绑定器
public class TimePickerModelBinder : DefaultModelBinder
{
public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException("bindingContext");
}
var result = new TimePicker();
var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (value != null)
{
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, value);
try
{
//result = Duration.Parse(value.AttemptedValue);
}
catch (Exception ex)
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, ex.Message);
}
}
return result;
}
}
以下内容适合我
型号:
public enum AmPmEnum
{
Am,
Pm
}
public class TimePicker
{
public TimeSpan Time { get; set; }
public AmPmEnum AmPm { get; set; }
}
public class MainModel
{
public TimePicker TimePickerField { get; set; }
}
控制器:
public class HomeController : Controller
{
public ActionResult Index()
{
var model = new MainModel
{
TimePickerField = new TimePicker
{
Time = TimeSpan.FromHours(1),
AmPm = AmPmEnum.Pm
}
};
return View(model);
}
[HttpPost]
public ActionResult Index(MainModel model)
{
return View(model);
}
}
视图(~/Views/Home/Index.cshtml
):
模型活页夹:
public class TimePickerModelBinder : IModelBinder
{
public object BindModel(
ControllerContext controllerContext,
ModelBindingContext bindingContext
)
{
var key = bindingContext.ModelName + "._picker_";
var value = bindingContext.ValueProvider.GetValue(key);
if (value == null)
{
return null;
}
var result = new TimePicker();
try
{
// TODO: instead of hardcoding do your parsing
// from value.AttemptedValue which will contain the string
// that was entered by the user
return new TimePicker
{
Time = TimeSpan.FromHours(2),
AmPm = AmPmEnum.Pm
};
}
catch (Exception ex)
{
bindingContext.ModelState.AddModelError(
bindingContext.ModelName,
ex.Message
);
// This is important in order to preserve the original user
// input in case of error when redisplaying the view
bindingContext.ModelState.SetModelValue(key, value);
}
return result;
}
}
最后在应用程序\u Start
中注册您的模型活页夹:
ModelBinders.Binders.Add(typeof(TimePicker), new TimePickerModelBinder());
从您的问题来看,不清楚提交了哪些值以及您的视图是什么样子的。还不清楚为什么您需要此模型的自定义模型绑定器,以及它的具体用途。此外,还不清楚您是直接实现了IModelBinder
,还是对DefaultModelBinder
进行了子类化。另一件不清楚的事情是,您试图在这个模型绑定器的哪个方法中调用bindingContext.ValueProvider.GetValue(bindingContext.ModelName)代码>(显然,如果您直接实现IModelBinder,将有一个方法:BindModel)。视图有两个字段:带时间的文本字段和带PM/AM选择的两个单选按钮。我不知道需要实现什么,或者IModelBinder直接实现什么,或者DefaultModelBinder的子类实现什么。很高兴能得到这方面的建议。是的,我称之为BindModel。我在问题中添加了我的binder。有机会看到你的代码吗?你也没有回答我的问题,为什么你需要一个定制的模型活页夹。你到底想达到什么目的?因为它的全系统组件用于挑选时间。我想用model自动绑定它。因为在一端,我得到一个字符串,比如:01:23 PM等等,我需要它来转换成正常时间。当我从数据库中获取时间并且需要它显示在组件中时也是如此。家让事情变得更清楚了。非常感谢。我用了一种不同的方式,但你的回答真的很有帮助。非常感谢。