我对mvc很新，我遇到了从搜索结果中分页列表的问题。以下是我到目前为止所尝试的内容：这是搜索业务逻辑：
public IQueryable<IGrouping<int, LLATTRDATA>> GetDocuments(DocumentSearchInputModel searchInputModel)
{
try
{
_entities = new Entities();
Logger.Info("connection to db successfull" + _entities);
}
catch (Exception e)
{
Logger.Error(e);
}
if (_entities != null)
{
var result = _entities.LLATTRDATAs.AsQueryable();
//Group Ids together
var ids = _entities.LLATTRDATAs.Where(r => r.VALSTR.Contains(searchInputModel.OwnersName) && r.ATTRID == 2)
.Select(r => r.ID);
Logger.Debug("the Ids are "+ids);
var selected = _entities.LLATTRDATAs.Where(r => ids.Contains(r.ID)).GroupBy(r => r.ID);
Logger.Debug("the selected Ids are "+ selected);
if (searchInputModel != null)
{
//result =
foreach (var selectedId in selected)
{
foreach (var item in selectedId)
{
item.DATAID = (
from l
in _entities.LLATTRDATAs
join d
in _entities.DTREEs
on l.ID
equals d.DATAID
join v
in _entities.DVERSDATAs
on d.VERSIONNUM
equals v.VERSION
where d.DATAID == v.DOCID && l.ATTRID == 2
&& l.VALSTR.Contains(searchInputModel.OwnersName) && l.VERNUM == v.VERSION
select l.ID).ToList().FirstOrDefault();
Logger.Info("DataID is "+ item.DATAID);
PROVIDERDATA providerData = (
from p
in _entities.PROVIDERDATAs
join v
in _entities.DVERSDATAs on p.PROVIDERID
equals v.PROVIDERID
where v.DOCID == item.DATAID && v.VERSION == 1
select p).FirstOrDefault();
Logger.Info("provider data is "+ providerData);
//Get the needed string from the full path
Regex regexForUsefulUrl = new Regex("(?<==')(.*)(?=','st)", RegexOptions.Singleline);
if (providerData != null)
{
var getUsefulUrl = regexForUsefulUrl.Matches(providerData.PROVIDERDATA1);
var useFulUrl = getUsefulUrl[0].Value;
Logger.Debug("Needed URL is:", new Exception(useFulUrl));
item.FILECONTENT = System.Configuration.ConfigurationManager.AppSettings["ServerUrl"] + useFulUrl;
}
}
}
// if (getFileUrl != null) searchInputModel.FileUrl = getFileUrl.providerType;
}
Logger.Info($"Results found {result}");
return selected;
}
return null;
}
现在这是搜索控制器：
public ActionResult Index()
{
if (Request.QueryString != null && Request.QueryString.Count > 0)
{
return View();
}
return null;
}
[HttpPost]
[HandleError]
public ActionResult Index(DocumentSearchInputModel searchInputModel, int page = 0)
{
_entities = new Entities();
const int pageSize = 2;
var business = new SearchBusinessLogic();
var model = business.GetDocuments(searchInputModel);
var count = model.Count();
var data = model.OrderBy(i => i.Key).Skip(page * pageSize).Take(pageSize).ToList();
//TempData["data"] = data;
TempData["data"] = data;
Session.Add("data", data);
ViewBag.MaxPage = (count / pageSize) - (count % pageSize == 0 ? 1 : 0);
ViewBag.Page = page;
//save user search inputs to the db
using (var db = new LagosOnlineESearchEntities())
{
var pin = TempData["UserPin"];
var result = db.UserSearchInformations.SingleOrDefault(b => b.ReceiptNumber == (string)pin);
if (result != null)
{
if (searchInputModel != null)
{
try
{
result.SearchByOwnersName = searchInputModel.OwnersName;
result.SearchByOwnersAddress = searchInputModel.OwnersAddress;
result.SearchByVolumeNumber = searchInputModel.VolumeNumber;
result.SearchBySurveyPlanNumber = searchInputModel.SurveyPlanNumber;
result.SearchByDescriptionOrLocationOfProperty = searchInputModel.DescriptionOrLocationOfProp;
}
catch (Exception e)
{
Logger.Error("Error", e);
}
}
Logger.Info("Details about to be to save");
db.SaveChanges();
Logger.Info("User search inputs saved to the db");
}
}
if (!ModelState.IsValid) {
return View(searchInputModel);
}
return View("searchResult", data);
}
注意：HttpGet索引显示搜索输入字段（它是多搜索）
这是我的观点（我遇到问题的部分）：
@if (ViewBag.Page > 0)
{
<a href="@Url.Action("Index", "Search", new {page = ViewBag.Page - 1})" class="btn btn-danger btn-fill">« PREV</a>
}
@if (ViewBag.Page < ViewBag.MaxPage)
{
<a href="@Url.Action("Index", "Search", new {page = ViewBag.Page + 1})" class="btn btn-danger btn-fill">NEXT «</a>
}
因此，如果单击“下一步”，则会转到httpGet搜索索引（搜索输入页面），而不是剩余的搜索结果。请问我该怎么做才能做到这一点？
由于
我刚刚找到另一条可能的解决方案，通过添加一个新的actionResult方法并将httpPost索引中的所有代码移动到这个方法，如下所示：
[HttpGet]
public ActionResult SearchResult(int page = 0)
{
DocumentSearchInputModel searchInputModel = (DocumentSearchInputModel) TempData["data"];
_entities = new Entities();
const int pageSize = 2;
var business = new SearchBusinessLogic();
var model = business.GetDocuments(searchInputModel);
var count = model.Count();
var data = model.OrderBy(i => i.Key).Skip(page * pageSize).Take(pageSize).ToList();
ViewBag.MaxPage = (count / pageSize) - (count % pageSize == 0 ? 1 : 0);
ViewBag.Page = page;
return View("searchResult", data);
}
但是searchInputModel返回null而不是用户输入，我尝试过tempData，viewbag和viewdata，似乎没有工作。所以我现在的挑战是如何将用户输入从索引httppost传递给新的actionresult方法。谢谢你们......
答案 0 :(得分：0)
要回答这个问题：“但是searchInputModel返回null而不是用户输入，我已经尝试过tempData，viewbag和viewdata，似乎没有工作。”这只是因为您在调用请求之前尚未将其值设置为TempData，ViewBag或ViewData。
所以，我的建议是将get和set代码添加到此部分：
@if (ViewBag.Page > 0)
{
//To get and set user inputs here
var searchInputModel = new DocumentSearchInputModel();
...
TempData["data"] = searchInputModel;
<a href="@Url.Action("Index", "Search", new {page = ViewBag.Page - 1})" class="btn btn-danger btn-fill">« PREV</a>
}
@if (ViewBag.Page < ViewBag.MaxPage)
{
//To get and set user inputs here
var searchInputModel = new DocumentSearchInputModel();
...
TempData["data"] = searchInputModel;
<a href="@Url.Action("Index", "Search", new {page = ViewBag.Page + 1})" class="btn btn-danger btn-fill">NEXT «</a>
}
但是，在编写此分页之前，我认为您最好先查看一些教程。例如，这个非常好且易于理解：https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/sorting-filtering-and-paging-with-the-entity-framework-in-an-asp-net-mvc-application