在.net core中使用ViewBag时，复选框未保持其状态

我正在使用ViewBag存储复选框的状态。它总是显示错误。当我删除value="isCurrentFilter"时，当我选中复选框时，它显示为启用状态。

谁能指导我哪里出问题了？

请给我提意见。

控制者

Public async Task<IActionResult> Index(bool searchText, bool currentFilter, int? page)
    {

            int selectedPage = page ?? 1;
            int bypassCount = (selectedPage - 1) * _pagingOptions.PageSize;

            if (searchText != false)
            {
                page = 1;
            }
            else
            {
                searchText = currentFilter;

            }

            ViewBag.CurrentFilter = searchText;

    }

Index.cshtml

<form asp-action="Index" method="get">

             @{ bool isCurrentFilter = ViewBag.CurrentFilter; }

              <input type="checkbox" asp-for="searchText" value="isCurrentFilter" class="form-control" /> 

         <div class="col-md-12">
            <button class="btn btn-primary" type="submit">Search</button>
         </div>                
        </form>

    <table class="table">
        <thead>
            <tr >
                <th>Message Id</th>
                <th>Status</th>
                <th>Resent</th>
                <th>Resent Date</th>
                <th>Created Date</th>
            </tr>
        </thead>
        <tbody>
            @if (Model.Items.TotalItemCount > 0)
            {
                @foreach (var item in Model.Items.ToList())
                {
                        <td>@Html.DisplayFor(modelItem => item.MessageId)</td>
                        <td>@Html.DisplayFor(modelItem => item.Status)</td>
                        <td>@Html.DisplayFor(modelItem => resentString)</td>
                        <td>@Html.DisplayFor(modelItem => resentDateString)</td>
                        <td>@Html.DisplayFor(modelItem => createdDateString)</td>
                    </tr>

                }
            }

        </tbody>
    </table>
</div>