从整数模型绑定TimeSpan

Dav*_*ale 6 c# asp.net asp.net-mvc

我想声明我的View Model类型的一些属性TimeSpan来显示TotalMinutes属性并绑定回一个TimeSpan.

我已经绑定了属性而没有使用强类型帮助器来检索TotalMinutes属性:

<%=Html.TextBox("Interval", Model.Interval.TotalMinutes)%>
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当该字段绑定回View Model类时,它将该数字解析为一天(1440分钟).

如何在某些属性上覆盖此行为(最好使用View Model本身的属性)?

Dar*_*rov 10

编写自定义模型绑定器似乎是一个好主意:

public class TimeSpanModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName + ".TotalMinutes");
        int totalMinutes;
        if (value != null && int.TryParse(value.AttemptedValue, out totalMinutes))
        {
            return TimeSpan.FromMinutes(totalMinutes);
        }
        return base.BindModel(controllerContext, bindingContext);
    }
}
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并注册Application_Start:

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    RegisterRoutes(RouteTable.Routes);
    ModelBinders.Binders.Add(typeof(TimeSpan), new TimeSpanModelBinder());
}
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最后总是喜欢在您的视图中使用强类型助手:

<% using (Html.BeginForm()) { %>
    <%= Html.EditorFor(x => x.Interval) %>
    <input type="submit" value="OK" />
<% } %>
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和相应的编辑器模板(~/Views/Home/EditorTemplates/TimeSpan.ascx):

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<TimeSpan>" %>
<%= Html.EditorFor(x => x.TotalMinutes) %>
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现在您的控制器可以像下面这样简单:

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new MyViewModel
        {
            Interval = TimeSpan.FromDays(1)
        };
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(MyViewModel model)
    {
        // The model will be properly bound here
        return View(model);
    }
}
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