如何根据模型在此局部视图中打印不同学号的计数

Question

如何根据部分视图模型获得不同的学生id的计数。我有一个模型，这是有结果的，但我想有一个标签上写着StudentIdCount和打印不同的学生证号码

@model IEnumerable<WebApp.Models.StudentInfo>
@(Html


            .Grid(Model)
            .Build(columns =>
            {

                columns.Add(model => model.StudentId).Titled("StudentId");
                columns.Add(model => model.Name).Titled("Name");
            })
            .Empty("No records found.")
            .Sortable()
            .Pageable(pager =>
            {
                pager.RowsPerPage = 15;
            })
)

我在下面试过了，但不起作用

 @model IEnumerable<WebApp.Models.StudentInfo>
@{
    ViewBag.Count = Model.Select(x => x.StudentId).Distinct().Count();

    <div class="row">
        <div class="col-md-4">
            <div class="form-group">
                <label>Count: ViewBag.Count</label>

            </div>
        </div>
    </div>
}
@model IEnumerable<CSA.Models.ReportsInfo>
    @(Html


                .Grid(Model)
                .Build(columns =>
                {

                    columns.Add(model => model.StudentId).Titled("StudentId");
                    columns.Add(model => model.Name).Titled("Name");
                })
                .Empty("No records found.")
                .Sortable()
                .Pageable(pager =>
                {
                    pager.RowsPerPage = 15;
                })
    )

Answer 1

有一个选项.WithGridItemsCount(string totalRecords)允许您显示总计数。希望能帮上忙，我的朋友

@model IEnumerable<WebApp.Models.StudentInfo>
    @{
        var inputStudentId = XXX; 
        var totalRecords = 0;
        if(inputStudentId != 0) //if the user want to search StudentId
        {
        totalRecords  = Model.Where(x => x.StudentId == inputStudentId).Select(x => x.StudentId).Distinct().Count();
}else
{
       totalRecords  = Model.Select(x => x.StudentId).Distinct().Count();
}


        <div class="row">
            <div class="col-md-4">
                <div class="form-group">
                    <label>Count: @totalRecords </label>

                </div>
            </div>
        </div>
    }