从一开始我就想为虚拟问题道歉。我是MVC的新手。
当我尝试从数据库加载所有记录时，我的索引页面上的等待操作超时。
我正在使用带有搜索字段和明确选择功能的PagedList。
我的域名模型如下所示
public class BulbBatch
{
public int BulbBatchID { get; set; }
[Required]
public int DeliveryID { get; set; }
public virtual Delivery Delivery { get; set; }
[Required]
public int BulbsAmount { get; set; }
public int? BoxesAmount { get; set; }
[DataType(DataType.Date)]
public DateTime? CoolingDate { get; set; }
public int? BatchLocationID { get; set; }
public virtual Location Location { get; set; }
public string Comments { get; set; }
public string BulbBatchBarCode { get; set; }
public byte[] BulbBatchBarCodeImage { get; set; }
public string BulbBatchImageURL { get; set; }
}
我的ViewModel for Index页面是下一个
public class BulbBatchViewModel
{
public int BulbBatchID { get; set; }
[DisplayName("Bulb Type Name")]
public string BulbTypeName { get; set; }
[DisplayName("Bulbs Amount")]
public int BulbsAmount { get; set; }
[DisplayName("Location Name")]
public string LocationName { get; set; }
}
因为我需要使用PagedList，所以我创建了额外的viewmodel来实现它。 使用PagedList;
public class BulbBatchListViewModel
{
public int? Page { get; set; }
/// <summary>
/// fields for searching
/// </summary>
public string BulbName { get; set; }
public string BarCode { get; set; }
public string LocationName { get; set; }
/// <summary>
/// using IPageList instead of IEnumerable to create pagination on the view
/// </summary>
public IPagedList<BulbBatchViewModel> SearchResult { get; set; }
public string SearchButton { get; set; }
public string ClearButton { get; set; }
}
最后，我的控制器中有一个Action Result Index方法，用于从数据库中检索数据并初始化我的BulbBatchesListViewModel。 我还尝试使用多个Include语句实现Eager Loading以减少对数据库的请求量
public ActionResult Index(BulbBatchListViewModel model)
{
db.Configuration.ProxyCreationEnabled = false;
// creating list with My viewModel for one item of BulbBatc because I need to replace indexes and add extra data from related tables
List<BulbBatchViewModel> batchesListVM = new List<BulbBatchViewModel>();
IQueryable<BulbBatch> results;
string barcode = "";
if (!string.IsNullOrEmpty(model.BarCode) || model.Page.HasValue)
barcode = '*' + model.BarCode + '*';
if (!string.IsNullOrEmpty(model.SearchButton) || model.Page.HasValue)
{
//get all records from database based upon filters
results = db.BulbBatches.Include(d => d.Delivery).Include(t => t.Delivery.BulbType).Where(b =>
(b.BulbBatchBarCode.Equals(model.BarCode) || string.IsNullOrEmpty(model.BarCode)) &&
(b.Delivery.BulbType.BulbName.ToLower().Equals(model.BulbName) || string.IsNullOrEmpty((model.BulbName))) &&
(b.Location.LocationName.ToLower().Equals(model.LocationName.ToLower()) || string.IsNullOrEmpty(model.LocationName))
);
//initializing of view for each item in result
foreach (var item in results)
{
var batchVM = new BulbBatchViewModel
{
BulbsAmount = item.BulbsAmount,
BulbTypeName = item.Delivery.BulbType.BulbName,
LocationName = item.Location.LocationName,
};
batchesListVM.Add(batchVM);
}
var pageIndex = model.Page ?? 1;
model.SearchResult = batchesListVM.ToPagedList(pageIndex, RecordsPerPage);
}
else
{
//get all records from database without filtering filters
results = db.BulbBatches.Include(d => d.Delivery).Include(t => t.Delivery.BulbType);
foreach (var item in results)
{
var batchVM = new BulbBatchViewModel
{
BulbsAmount = item.BulbsAmount,
BulbTypeName = item.Delivery.BulbType.BulbName,
LocationName = item.Location.LocationName,
};
batchesListVM.Add(batchVM);
}
var pageIndex = model.Page ?? 1;
model.SearchResult = batchesListVM.ToPagedList(pageIndex, RecordsPerPage);
}
if (!string.IsNullOrEmpty(model.ClearButton))
{
model.BarCode = "";
model.BulbName = "";
model.LocationName = "";
ModelState.Clear();
}
return View(model);
}
当我第一次去索引页面时（没有任何过滤/搜索）我有一个错误“等待操作超时”
results = db.BulbBatches.Include(d => d.Delivery).Include(t => t.Delivery.BulbType);
foreach (var item in results)
{
var batchVM = new BulbBatchViewModel
...
这是我的其他声明的一部分
当我尝试从数据库加载10行时，它可以正常工作，但是当我放入1000时，它会停止。
请帮我解决这个问题。
答案 0 :(得分：0)
问题解决了。 据我所知，问题是由字段引起的
public byte[] BulbBatchBarCodeImage { get; set; }
在我的模型中。所以我做了什么，我改变了选择代码，我不再加载BarCodeImage字段了。 除了我重建一点动作
db.Configuration.ProxyCreationEnabled = false;
List<BulbBatchViewModel> results = new List<BulbBatchViewModel>();
string barcode = "";
if (!string.IsNullOrEmpty(model.BarCode))
barcode = '*' + model.BarCode + '*';
results = db.BulbBatches.Include(d => d.Delivery).Include(t => t.Delivery.BulbType).Include(l => l.Location)
.Where(b =>
(b.BulbBatchBarCode.Equals(model.BarCode) || string.IsNullOrEmpty(model.BarCode)) &&
(b.Delivery.BulbType.BulbName.ToLower().Equals(model.BulbName.ToLower()) || string.IsNullOrEmpty((model.BulbName))) &&
(b.Location.LocationName.ToLower().Equals(model.LocationName.ToLower()) || string.IsNullOrEmpty(model.LocationName))
)
.Select(x => new BulbBatchViewModel
{
BulbBatchID = x.BulbBatchID,
BulbsAmount = x.BulbsAmount,
BulbTypeName = x.Delivery.BulbType.BulbName,
LocationName = x.Location.LocationName
})
.ToList();
model.SearchResult = results.OrderBy(r => r.BulbBatchID).Skip((model.Page - 1) * model.PageSize).Take(model.PageSize).ToList();
model.TotalRecords = db.BulbBatches.Count(b =>
(b.BulbBatchBarCode.Equals(model.BarCode) || string.IsNullOrEmpty(model.BarCode)) &&
(b.Delivery.BulbType.BulbName.ToLower().Equals(model.BulbName.ToLower()) || string.IsNullOrEmpty((model.BulbName))) &&
(b.Location.LocationName.ToLower().Equals(model.LocationName.ToLower()) || string.IsNullOrEmpty(model.LocationName))
);
return View(model);
在我的BulbBatchListViewModel中，我不再使用PagedList而是使用简单的List。在.Take（）和.Skip方法的帮助下，我正在桌面上导航。
所以对于会遇到同样困难的人。 更新了ViewModel
public class BulbBatchListViewModel
{
public int Page { get; set; }
public int PageSize { get; set; }
public int TotalRecords { get; set; }
///<summary>
/// order field
/// </summary>
public string Sort { get; set; }
public string SortDir { get; set; }
/// <summary>
/// fields for searching
/// </summary>
public string BulbName { get; set; }
public string BarCode { get; set; }
public string LocationName { get; set; }
/// <summary>
/// we are using IPageList instead of IEnumerable to create pagination on the view
/// </summary>
//public IPagedList<BulbBatchViewModel> SearchResult { get; set; }
public List<BulbBatchViewModel> SearchResult { get; set; }
public string SearchButton { get; set; }
public string ClearButton { get; set; }
public BulbBatchListViewModel()
{
Page = 1;
PageSize = 5;
Sort = "BulbBatchID";
SortDir = "ASC";
}
}
控制器
public ActionResult Index(BulbBatchListViewModel model)
{
db.Configuration.ProxyCreationEnabled = false;
List<BulbBatchViewModel> results = new List<BulbBatchViewModel>();
string barcode = "";
if (!string.IsNullOrEmpty(model.BarCode))
barcode = '*' + model.BarCode + '*';
results = db.BulbBatches.Include(d => d.Delivery).Include(t => t.Delivery.BulbType).Include(l => l.Location)
.Where(b =>
(b.BulbBatchBarCode.Equals(model.BarCode) || string.IsNullOrEmpty(model.BarCode)) &&
(b.Delivery.BulbType.BulbName.ToLower().Equals(model.BulbName.ToLower()) || string.IsNullOrEmpty((model.BulbName))) &&
(b.Location.LocationName.ToLower().Equals(model.LocationName.ToLower()) || string.IsNullOrEmpty(model.LocationName))
)
.Select(x => new BulbBatchViewModel
{
BulbBatchID = x.BulbBatchID,
BulbsAmount = x.BulbsAmount,
BulbTypeName = x.Delivery.BulbType.BulbName,
LocationName = x.Location.LocationName
})
.ToList();
model.SearchResult = results.OrderBy(r => r.BulbBatchID).Skip((model.Page - 1) * model.PageSize).Take(model.PageSize).ToList();
model.TotalRecords = db.BulbBatches.Count(b =>
(b.BulbBatchBarCode.Equals(model.BarCode) || string.IsNullOrEmpty(model.BarCode)) &&
(b.Delivery.BulbType.BulbName.ToLower().Equals(model.BulbName.ToLower()) || string.IsNullOrEmpty((model.BulbName))) &&
(b.Location.LocationName.ToLower().Equals(model.LocationName.ToLower()) || string.IsNullOrEmpty(model.LocationName))
);
return View(model);
}
感谢你们所有人。