Razor Foreach Loop没有返回所有数据

时间:2012-07-05 16:09:32

标签: c# asp.net-mvc-3 entity-framework razor

我有一个foreach循环,它根据模型中的项目数构建超链接。它工作正常,除了说:ProgramId = @item.ProgramIds.First()只返回每个ProgramType的第一个程序ID。让它循环遍历所有程序ID的语法是什么,而不仅仅是第一个?

@model IEnumerable<CMESurvey.ViewModels.ProgramTypeViewModel>
@{
    ViewBag.Title = "Home";
}
@foreach (var item in Model)
{ 
    <h2>@Html.DisplayFor(modelItem => item.ProgramTypes)</h2> 

    <ul>
        @foreach (var ProgramTitles in item.ProgramTitles)
        {
            <li>

                @Html.ActionLink(@ProgramTitles, "Results", "SurveyResponse", new { ProgramId = @item.ProgramIds.First() }, null)
    </li>
    }
</ul>

}

   public class ProgramTypeViewModel
    {
        public int ProgramTypeIds { get; set; }

        public IEnumerable<string> ProgramTitles { get; set; }

        public IEnumerable<int> ProgramIds { get; set; }

        public IEnumerable<string> ProgramTypes { get; set; }

    } 

控制器操作:

 public ViewResult Home()
        {
            var data = from SurveyProgramModel in surveyProgramRepository.Get()
                       group SurveyProgramModel by SurveyProgramModel.ProgramTypeId into programTypeGroup
           select new ProgramTypeViewModel()
           {

               ProgramTypeIds = programTypeGroup.Key,
               ProgramIds = programTypeGroup.Select(r => r.ProgramId),
               ProgramTitles = programTypeGroup.Select(r => r.ProgramTitle),
               ProgramTypes = programTypeGroup.Select(r => r.ProgramType.ProgramType).Distinct(),
           };

            return View(data);
        }

2 个答案:

答案 0 :(得分:3)

item指的是外循环的值。看起来你想要使用内循环中的值:

@foreach (var ProgramTitles in item.ProgramTitles)         
{             
    foreach(var programId in item.ProgramIds)
    {

       <li>                  
           @Html.ActionLink(ProgramTitles, "Results", "SurveyResponse", new { ProgramId = programId  }, null)             
       </li>         
    }
} 

提供viewModel之后,看起来你有ProgramTitles和ProgramIds作为两个断开连接的数组。也许,你所拥有的是ProgramTitle的数组索引n处的项目在ProgramIds数组的第n项中具有相应的条目。 viewModel可以改进,但这是我的解决方案:

@for (var index = 0; index < item.ProgramTitles.Count; index++)         
{             

       <li>                  
           @Html.ActionLink(ProgramTitles[index], "Results", "SurveyResponse", new {  ProgramId = item.ProgramIds[index]}, null)             
       </li>         
}

答案 1 :(得分:1)

我对你的模型和查询有点困惑。据我所知,程序和类型之间应该存在关系,而不是。

所以,我强烈建议您查看您的viewmodel及其查询。

但是,看看这是否有帮助:

@foreach (var currentProgramTypeViewModel in Model)
        { 
            foreach(string currentProgramType in currentProgramTypeViewModel.ProgramTypes)
            {
                <h2>@currentProgramType</h2> 

                <ul>
                    @for (int mProgramIndex = 0; mProgramIndex < currentProgramTypeViewModel.ProgramIds.Count(); mProgramIndex++)
                    {
                        var programTitle = currentProgramTypeViewModel.ProgramTitles.ToList<string>()[mProgramIndex];
                        var programId = currentProgramTypeViewModel.ProgramIds.ToList<int>()[mProgramIndex];
                        <li>
                            @Html.ActionLink(programTitle, "Results", "SurveyResponse", new { ProgramId = programId }, null)
                        </li>
                    }
                </ul>
            }
        }