使用除dataValueField / dataTextField之外的第三个值将ViewModel绑定到DropDownListFor

时间:2012-09-08 21:26:05

标签: c# asp.net-mvc

当我在View中显示testplanViewModel列表并且用户选择一个时,SelectedTestplanId将返回到Controller post动作。还应该返回的是属于SelectedTestplanId的TemplateId。

运行AutoMapper定义时, Testplan.TestplanId 会隐式复制到 TestplanViewModel.TestplanId 。通过在TestplanViewModel上提供 TemplateId 可以实现同样的目的。当用户现在在视图中选择“TestplanViewModel”时,如何将TemplateId附加到控制器操作以在那里访问它? DropDownList不允许2个dataValueFields!

CreateMap<Testplan, TestplanViewModel>().ForMember(dest => dest.Name, opt => opt.MapFrom(src => string.Format("{0}-{1}-{2}-{3}", src.Release.Name, src.Template.Name, src.CreatedAt, src.CreatedBy)));

public ActionResult OpenTestplanViewModels()
{
    IEnumerable<Testplan> testplans = _testplanDataProvider.GetTestplans();          
    var viewModel = new OpenTestplanViewModel
    {
        DisplayList = Mapper.Map<IEnumerable<Testplan>, IEnumerable<TestplanViewModel>>(testplans)
    };
    return PartialView(viewModel);
}


public class TestplanViewModel
{      
    public int TestplanId { get; set; }     
    public string Name { get; set; }           
}


public class OpenTestplanViewModel
{
    [Required(ErrorMessage = "No item selected.")]
    public int SelectedTestplanId { get; set; } 
    public IEnumerable<TestplanViewModel> DisplayList { get; set; }       
}

OpenTestplanViewModel

@using (Html.BeginForm("Open", "Testplan"))
{ 
    @Html.ValidationSummary(false)      
    @Html.DropDownListFor(x => x.SelectedTestplanId, new SelectList(Model.DisplayList, "TestplanId", "Name"), new { @class = "listviewmodel" })  
}

解决方案

 public class OpenTestplanViewModel
    {
        [Required(ErrorMessage = "No item selected.")]
        public string TestplanIdAndTemplateId { get; set; } 
        public IEnumerable<TestplanViewModel> DisplayList { get; set; }

        public int SelectedTestplanId
        {
            get
            {
                return Convert.ToInt32(TestplanIdAndTemplateId.Split(new[] { '_' }).First());
            }
        }
        public int SelectedTemplateId
        {
            get
            {
                return Convert.ToInt32(TestplanIdAndTemplateId.Split(new[] { '_' }).Last());
            }
        }   
    }

 CreateMap<Testplan, TestplanViewModel>()
                .ForMember(d => d.Name, o => o.MapFrom(src =>  string.Format("{0}-{1}-{2}-{3}", src.Release.Name, src.Template.Name, src.CreatedAt, src.CreatedBy)))
                .ForMember(d => d.TestplanIdAndTemplateId, o => o.MapFrom(src => src.TestplanId + "_" + src.TemplateId));

1 个答案:

答案 0 :(得分:1)

HTML并没有真正起作用。如果您希望从下拉列表的帖子返回多个值(帮助程序生成select元素),您必须在视图模型上创建一个属性,然后在控制器中进行解析。 / p>

例如,如果您有两个整数ID字段,则组合属性可以创建类似23_42的值。然后,您可以使用Split方法获取正确的值(23&amp; 42)。