我正在嘗試在 ASP.NET MVC 中執行下拉篩選內容。我希望下拉列表顯示三種畢業狀態（已畢業、通過、未通過），當我選擇一個時，它只會顯示所選狀態的學生！控制器：ViewBag.GraduationStatus = new SelectList(db.Graduated_Students, "Graduated Status");var graduates = db.Graduated_Students.Where(student => student.GraduationStatus != null);return View(graduates.ToList());看法：@using (Html.BeginForm()){ <table> <tr> <th> @Html.DropDownList("GraduationStatus", null, htmlAttributes: new { @class = "form-control" }) </th> <th> <input type="submit" value="Filter by graduation Status" /> </th> </tr> </table>}模型 ：namespace CodeboxxSchoolPortal{ using System; using System.ComponentModel.DataAnnotations; using System.Collections.Generic; public partial class Graduated_Students { public int ID { get; set; } public int CohortId { get; set; } public string GraduationStatus { get; set; } public string Name { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public string ContractStatus { get; set; } public string DepositStatus { get; set; } public Nullable<int> PartnerId { get; set; } public string PartnerName { get; set; } public List<SelectListItem> GraduationStatusList = new List<SelectListItem> { new SelectListItem { Value="Graduated", Text="Graduated" }, new SelectListItem { Value ="Pass", Text="Pass" }, new SelectListItem { Value ="Failed", Text="Failed" } }; public class SelectListItem { public string Value { get; set; } public string Text { get; set; } } }}
1 回答
胡子哥哥
TA貢獻1825條經驗 獲得超6個贊
這是我認為你應該做的，
如果您Action在控制器中是GetStudents，并且您的下拉列表的值為字符串（畢業狀態），請將其傳遞給過濾器按鈕上的控制器單擊
[HttpPost]
public ActionResult Documents(string? graduationStatus)
{
var graduates = db.Graduated_Students.Where(student => student.GraduationStatus == graduationStatus);
return View(graduates.ToList());
}
請注意，必須與數據庫中的string? graduationStatus類型相同student.GraduationStatus
還要確保Html.BeginForm()對控制器有正確的操作
@Html.BeginForm("GetStudents", "Controller", FormMethod.Post, new { @class = "my_form"})
編輯：
將下面的行更改為
@Html.DropDownList("GraduationStatus", new SelectList(ViewBag.GraduationStatus, "Value Here", "Text Here", null), "- Select -", new { @class = "form-control"})
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