自定义模型管理器中的绑定错误会删除用户输入的值
我正在使用ASP.NET MVC 3 RTM，我有一个这样的视图模型：
public class TaskModel
{
// Lot's of normal properties like int, string, datetime etc.
public TimeOfDay TimeOfDay { get; set; }
}
TimeOfDay
public class TimeOfDayModelBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
var result = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
try
{
// Let the TimeOfDay struct take care of the conversion from string.
return new TimeOfDay(result.AttemptedValue, result.Culture);
}
catch (ArgumentException)
{
bindingContext.ModelState.AddModelError(bindingContext.ModelName, "Value is invalid. Examples of valid values: 6:30, 16:00");
return bindingContext.Model; // Also tried: return null, return value.AttemptedValue
}
}
}
ArgumentException
@model Nullable<TimeOfDay>
@if (Model.HasValue)
{
@Html.TextBox(string.Empty, Model.Value.ToString());
}
else
{
@Html.TextBox(string.Empty);
}
没有找到相关结果
已邀请:
1 个回复
唤副埂侧壬
。所以代码是这样的：public class TimeOfDayModelBinder : IModelBinder { public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) { var result = bindingContext.ValueProvider.GetValue(bindingContext.ModelName); try { // Let the TimeOfDay struct take care of the conversion from string. return new TimeOfDay(result.AttemptedValue, result.Culture); } catch (ArgumentException) { bindingContext.ModelState.AddModelError(bindingContext.ModelName, "Value is invalid. Examples of valid values: 6:30, 16:00"); // This line is what makes the difference: bindingContext.ModelState.SetModelValue(bindingContext.ModelName, result); return bindingContext.Model; } } }