我想在 ASP.NET MVC 中使用复选框做一个多重选择器，它从 Sql 数据库中获取员工 ID

Posted 2023-04-09

【中文标题】我想在 ASP.NET MVC 中使用复选框做一个多重选择器，它从 Sql 数据库中获取员工 ID

【英文标题】：I want to do a multiple selector with checkboxes in ASP.NET MVC it fetches the employee ID from a Sql database

【发布时间】：2021-06-01 15:10:39

【问题描述】：

<label asp-for="EmployeeId" class="control-label"></label>
                    @html.DropDownListFor(m => m.EmployeeId, (SelectList)ViewBag.LineManager, "Select",
                    new  @class = "form-control", multiple = "multiple")
                    @Html.ValidationMessageFor(model => model.EmployeeId, "", new  @class = "text-danger" )

                </div>

'''''''''我的控制器看起来像这样'''''''''' 我的控制器处理带回我在数据库中拥有的所有员工姓名的信息已创建

字符串 uri = "Vfl";

        var searchValue = HttpContext.Request.Form["search[value]"].FirstOrDefault();

        var start = Request.Form["start"].FirstOrDefault();

        // Paging Length 10,20  
        var length = Request.Form["length"].FirstOrDefault();


        int pageSize = length != null ? Convert.ToInt32(length) : 0;
        int skip = start != null ? Convert.ToInt32(start) : 0;
        int recordsTotal = 0;

        var response = _vflService.GetAll(uri, "");

        foreach(var item in response)
        
            item.EmployeeName = GetEmployeeName(item.ReponsiblePersonId);
        
        //Search
        if (!string.IsNullOrEmpty(searchValue))
        
            response = response.Where(m => m.EmployeeName.ToLower().Contains(searchValue.ToLower()) || (!string.IsNullOrEmpty(m.ImmediateCauseDescription) && m.ImmediateCauseDescription.ToLower().Contains(searchValue.ToLower())));
        

        recordsTotal = response.Count();

        //Paging   
        var data = response.Skip(skip).Take(pageSize).ToList();

        return Json(new  recordsFiltered = recordsTotal, recordsTotal = recordsTotal, data = data );

【参考方案1】：

您应该使用 MultiSelectList - https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.mvc.rendering.multiselectlist?view=aspnetcore-5.0

【参考方案2】：

尝试使用

@Html.DropDownListFor(m => m.EmployeeId, (SelectList)ViewBag.LineManager, "Select", new  @class = "form-control",multiple = "multiple", size = "5" )