C# 加速linq实体查询

我目前有一个查询，它不需要很长时间，有时会因为数据库中的数据量而崩溃

有人能注意到我能做些什么来加速它吗

public IList<Report> GetReport(CmsEntities context, long manufacturerId, long? regionId, long? vehicleTypeId)
        {
            var now = DateTime.Now;
            var today = new DateTime(now.Year, now.Month, 1);
            var date1monthago = today.AddMonths(-1);
            var date2monthago = today.AddMonths(-2);
            var date3monthago = today.AddMonths(-3);
            var date4monthago = today.AddMonths(-4);
            var date5monthago = today.AddMonths(-5);
            var date6monthago = today.AddMonths(-6);
            today = TimeManager.EndOfDay(new DateTime(now.AddMonths(-1).Year, today.AddMonths(-1).Month, DateTime.DaysInMonth(now.Year, today.AddMonths(-1).Month)));             
            var query = from item in context.Invoices
                         where item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select(x => x.ManufacturerId).Contains(manufacturerId)
                         && (item.InvoiceDate >= date6monthago && item.InvoiceDate <= today)
                         && (regionId.HasValue && regionId.Value > 0 ? item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select(x => x.RegionId).Contains(regionId.Value) : true)
                         && (item.InvType == "I" || item.InvType == null)
                         && (vehicleTypeId.HasValue && vehicleTypeId.Value > 0 ? item.Repair.Job.Vehicle.Model.VehicleTypes.Select(x => x.Id).Contains(vehicleTypeId.Value) : true)
                         select item;

            var query2 = from item in query
                         group item by new { item.Repair.Job.Bodyshop } into g
                         let manufJobs = query.Where(x => x.Repair.Job.Vehicle.Model.ManufacturerId == manufacturerId && x.Repair.Job.BodyshopId == g.Key.Bodyshop.Id)
                         let allJobs = query.Where(x => x.Repair.Job.BodyshopId == g.Key.Bodyshop.Id)
                         select new tReport
                         {                                     
    MonthSixManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date6monthago.Month && x.InvoiceDate.Year == date6monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthSixJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date6monthago.Month && x.InvoiceDate.Year == date6monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    MonthFiveManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date5monthago.Month && x.InvoiceDate.Year == date5monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthFiveJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date5monthago.Month && x.InvoiceDate.Year == date5monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    MonthFourManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date4monthago.Month && x.InvoiceDate.Year == date4monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthFourJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date4monthago.Month && x.InvoiceDate.Year == date4monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    MonthThreeManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date3monthago.Month && x.InvoiceDate.Year == date3monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthThreeJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date3monthago.Month && x.InvoiceDate.Year == date3monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    MonthTwoManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date2monthago.Month && x.InvoiceDate.Year == date2monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthTwoJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date2monthago.Month && x.InvoiceDate.Year == date2monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    MonthOneManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date1monthago.Month && x.InvoiceDate.Year == date1monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthOneJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date1monthago.Month && x.InvoiceDate.Year == date1monthago.Year).GroupBy(x => x.Repair.Job).Count(),

    ManufTotal = manufJobs.GroupBy(x => x.Repair.Job).Count(),
    Total = allJobs.GroupBy(x => x.Repair.Job).Count(),

    PercentageOf = ((decimal)manufJobs.GroupBy(x => x.Repair.Job).Count() / (decimal)allJobs.GroupBy(x => x.Repair.Job).Count()) * 100
                         };

            return query2.OrderBy(x => x).ToList();
        }

public IList GetReport（CMSenties上下文、long manufacturerId、long？regionId、long？vehicleTypeId）
{
var now=DateTime.now；
var today=新日期时间（现在.年，现在.月，1）；
var date1monthago=今天.AddMonths（-1）；
var Date2Monmonthago=今天.AddMonths（-2）；
var Date3个月前=今天。添加月份（-3）；
var date4monthago=今天.AddMonths（-4）；
var Date5Monmonthago=今天.AddMonths（-5）；
var date6monthago=今天.AddMonths（-6）；
today=TimeManager.EndOfDay（新的日期时间（now.AddMonths（-1）.Year，today.AddMonths（-1）.Month，DateTime.DaysInMonth（now.Year，today.AddMonths（-1）.Month）；
var query=来自上下文中的项目。发票
其中item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select（x=>x.ManufacturerId.Contains（ManufacturerId）
&&（item.InvoiceDate>=date6monthago&&item.InvoiceDate 0？item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select（x=>x.RegionId.Contains（RegionId.Value）：true）
&&（item.InvType==“I”| | item.InvType==null）
&&（vehicleTypeId.HasValue&&vehicleTypeId.Value>0？item.Repair.Job.Vehicle.Model.VehicleTypes.Select（x=>x.Id）。包含（vehicleTypeId.Value）：true）
选择项目；
var query2=来自查询中的项
按新{item.Repair.Job.Bodyshop}将项目分组到g中
设manufJobs=query.Where（x=>x.Repair.Job.Vehicle.Model.ManufacturerId==ManufacturerId&&x.Repair.Job.BodyshopId==g.Key.Bodyshop.Id）
让allJobs=query.Where（x=>x.Repair.Job.BodyshopId==g.Key.Bodyshop.Id）
选择new tReport
{                                     
MonthximanufjobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==date6monthago.Month&&x.InvoiceDate.Year==date6monthago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthSixJobTotal=allJobs.Where（x=>x.InvoiceDate.Month==date6monthago.Month&&x.InvoiceDate.Year==date6monthago.Year）.GroupBy（x=>x.Repair.Job）.Count（），
MonthFiveManufJobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==Date5Monmonthago.Month&&x.InvoiceDate.Year==Date5Monmonthago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthFiveJobTotal=allJobs.Where（x=>x.InvoiceDate.Month==Date5Monmonthago.Month&&x.InvoiceDate.Year==Date5Monmonthago.Year）.GroupBy（x=>x.Repair.Job）.Count（），
MonthFourManufJobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==date4monthago.Month&&x.InvoiceDate.Year==date4monthago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthFourJobTotal=所有作业。其中（x=>x.InvoiceDate.Month==date4monthago.Month&&x.InvoiceDate.Year==date4monthago.Year）。GroupBy（x=>x.Repair.Job）。计数（），
MonthThreManufjobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==date3monthago.Month&&x.InvoiceDate.Year==date3monthago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthThreJobTotal=allJobs.Where（x=>x.InvoiceDate.Month==date3monthago.Month&&x.InvoiceDate.Year==date3monthago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthWomanufjobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==Date2monago.Month&&x.InvoiceDate.Year==Date2monago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthTwoJobTotal=allJobs.Where（x=>x.InvoiceDate.Month==Date2MonMonthAgo.Month&&x.InvoiceDate.Year==Date2MonMonthAgo.Year）.GroupBy（x=>x.Repair.Job）.Count（），
MonthOneManufJobTotal=manufJobs.Where（x=>x.InvoiceDate.Month==Date1Monmonago.Month&&x.InvoiceDate.Year==Date1Monmonago.Year）。GroupBy（x=>x.Repair.Job）。Count（），
MonthOneJobTotal=所有作业。其中（x=>x.InvoiceDate.Month==Date1Monago.Month&&x.InvoiceDate.Year==Date1Monago.Year）。分组依据（x=>x.Repair.Job）。计数（），
ManufTotal=manufJobs.GroupBy（x=>x.Repair.Job）.Count（），
总计=所有作业.GroupBy（x=>x.Repair.Job）.Count（），
PercentageOf=（（十进制）manufJobs.GroupBy（x=>x.Repair.Job）.Count（）/（十进制）allJobs.GroupBy（x=>x.Repair.Job）.Count（））*100
};
返回query2.OrderBy（x=>x.ToList（）；
}

编辑

var query=来自context.Invoices.AsNoTracking（）中的项目
其中item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any（x=>x.ManufacturerId==ManufacturerId）
&&（item.InvoiceDate>=12个月前的日期和&item.InvoiceDate 0）
{
query=query.Where（item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select（x=>x.RegionId）.Contains（RegionId.Value））；
}
if（vehicleTypeId.HasValue&&vehicleTypeId.Value>0）
{
query=query.Where（item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Select（x=>x.Id）.Contains（vehicleTypeId.Value））；
}
var query2=来自hey中的项目
按新{item.Repair.Job.Bodyshop，item.InvoiceDate.Month}将项目分组到m中
选择new TReport
{
车身车间=m.Key.Bodyshop.Name，
间隔=m.Key.Bodyshop.Bays，
Region=m.Key.Bodyshop.Manufacturer2Bodyshop.FirstOrDefault（x=>x.ManufacturerId==ManufacturerId）.Region.Name，
BodyshopCode=m.Key.Bodyshop.Manufacturer2Bodyshop.FirstOrDefault（x=>x.ManufacturerId==ManufacturerId）.BodyshopCode，
总计=m.计数（），
ManufTotal=m.Where（x=>x.Repair.Job.Vehicle.Model.ManufacturerId==ManufacturerId）.Count（），
总计=m.GroupBy（j=>j.InvoiceDate.Month）。选择(
var query = from item in context.Invoices.AsNoTracking()
                    where item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(x => x.ManufacturerId == manufacturerId)
                    && (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
                    && (item.InvType == "I" || item.InvType == null)
                    select item;

        if (regionId.HasValue && regionId.Value > 0)
        {
            query = query.Where(item => item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select(x => x.RegionId).Contains(regionId.Value));
        }

        if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
        {
            query = query.Where(item => item.Repair.Job.Vehicle.Model.VehicleTypes.Select(x => x.Id).Contains(vehicleTypeId.Value));
        }


              var query2 = from item in hey
                     group item by new { item.Repair.Job.Bodyshop, item.InvoiceDate.Month } into m
                     select new TReport
                     {
                         Bodyshop = m.Key.Bodyshop.Name,
                         Bays = m.Key.Bodyshop.Bays,
                         Region = m.Key.Bodyshop.Manufacturer2Bodyshop.FirstOrDefault(x => x.ManufacturerId == manufacturerId).Region.Name,
                         BodyshopCode = m.Key.Bodyshop.Manufacturer2Bodyshop.FirstOrDefault(x => x.ManufacturerId == manufacturerId).BodyshopCode,
                         Total = m.Count(),
                         ManufTotal = m.Where(x => x.Repair.Job.Vehicle.Model.ManufacturerId == manufacturerId).Count(),
                         Totals = m.GroupBy(j => j.InvoiceDate.Month).Select(j => new TPercentReportInner
                         {
                             Month = j.Key,
                             ManufTotal = j.Where(x => x.Repair.Job.Vehicle.Model.ManufacturerId == manufacturerId).Count(),
                             AllTotal = j.Count()
                         })
                     };

public IList<Report> GetReport(CmsEntities context, long manufacturerId, long? regionId, long? vehicleTypeId, int pageSize, int currentPage)
        {

        //Code removed to simplify

        return  query2.Skip(pageSize * currentPage).Take(pageSize );

        }

var allJobs = query.Where(x => x.Repair.Job.BodyshopId == g.Key.Bodyshop.Id).ToArray();

MonthSixManufJobTotal = manufJobs.Where(x => x.InvoiceDate.Month == date6monthago.Month && x.InvoiceDate.Year == date6monthago.Year).GroupBy(x => x.Repair.Job).Count(),
    MonthSixJobTotal = allJobs.Where(x => x.InvoiceDate.Month == date6monthago.Month && x.InvoiceDate.Year == date6monthago.Year).GroupBy(x => x.Repair.Job).Count(),

var query = from item in context.Invoices.AsNoTracking()
            where item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select(x => x.ManufacturerId).Contains(manufacturerId)
            && (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
            && (item.InvType == "I" || item.InvType == null)
            select item;

if (regionId.HasValue && regionId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Select(x => x.RegionId).Contains(regionId.Value));

if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Select(x => x.Id).Contains(vehicleTypeId.Value));

var query2 = from item in query
             group item by new { item.InvoiceDate.Month, item.Repair.Job.Bodyshop } into g
             select new TReport
             {
                 BodyshopId = g.Key.Bodyshop.Id,  
                 Month = g.Key.Month,
                 MonthAllJobTotal = g.Count()
             };

return query2.ToList();

var query = from item in context.Invoices.AsNoTracking()
            where item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.ManufacturerId==manufacturerId)
            && (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
            && (item.InvType == "I" || item.InvType == null)
            select item;

if (regionId.HasValue && regionId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.RegionId==regionId.Value));

if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Any(v=>v.Id==vehicleTypeId.Value));

var query2 = from item in query
             group item by new { item.InvoiceDate.Month, item.Repair.Job.Bodyshop } into g
             select new TReport
             {
                 BodyshopId = g.Key.Bodyshop.Id,  
                 Month = g.Key.Month,
                 MonthAllJobTotal = g.Count()
             };

return query2.ToList();

var query = from item in context.Invoices.AsNoTracking()
            where (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
            && (item.InvType == "I" || item.InvType == null)
            select item;

if (manufacturerId.HasValue && manufacturerId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.ManufacturerId==manufacturerId));

if (regionId.HasValue && regionId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.RegionId==regionId.Value));

if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
    query=query.Where(item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Any(v=>v.Id==vehicleTypeId.Value));

var query2 = from item in query
             group item by new { item.InvoiceDate.Month, item.Repair.Job.Bodyshop } into g
             select new TReport
             {
                 BodyshopId = g.Key.Bodyshop.Id,  
                 Month = g.Key.Month,
                 MonthAllJobTotal = g.Count()
             };

return query2.ToList();

public IQueryable<Report> GetReport(CmsEntities context, long? manufacturerId, long? regionId, long? vehicleTypeId)
    {
{
        var now = DateTime.Now;
        var today = new DateTime(now.Year, now.Month, 1);
        var date1monthago = today.AddMonths(-1);
        var date2monthago = today.AddMonths(-2);
        var date3monthago = today.AddMonths(-3);
        var date4monthago = today.AddMonths(-4);
        var date5monthago = today.AddMonths(-5);
        var date6monthago = today.AddMonths(-6);
        today = TimeManager.EndOfDay(new DateTime(now.AddMonths(-1).Year, today.AddMonths(-1).Month, DateTime.DaysInMonth(now.Year, today.AddMonths(-1).Month)));             

    var query = from item in context.Invoices.AsNoTracking()
                where (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
                && (item.InvType == "I" || item.InvType == null)
                select item;

    if (manufacturerId.HasValue && manufacturerId.Value > 0)
        query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.ManufacturerId==manufacturerId));

    if (regionId.HasValue && regionId.Value > 0)
        query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.RegionId==regionId.Value));

    if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
        query=query.Where(item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Any(v=>v.Id==vehicleTypeId.Value));

    var query2 = from item in query
                 group item by new { item.InvoiceDate.Month, item.Repair.Job.Bodyshop } into g
                 select new TReport
                 {
                     BodyshopId = g.Key.Bodyshop.Id,  
                     Month = g.Key.Month,
                     MonthAllJobTotal = g.Count()
                 };

    return query2;
}

public static class MyExtensions 
{
    public static IQueryable<Invoice> Recent(this IQueryable<Invoice> context,long? manufacturerId=null,long? regionId=null,long? vehicleId=null)
    {
        var now = DateTime.Now;
        var today = new DateTime(now.Year, now.Month, 1);
        var date1monthago = today.AddMonths(-1);
        var date2monthago = today.AddMonths(-2);
        var date3monthago = today.AddMonths(-3);
        var date4monthago = today.AddMonths(-4);
        var date5monthago = today.AddMonths(-5);
        var date6monthago = today.AddMonths(-6);
        today = TimeManager.EndOfDay(new DateTime(now.AddMonths(-1).Year, today.AddMonths(-1).Month, DateTime.DaysInMonth(now.Year, today.AddMonths(-1).Month)));             

        var query = from item in context.Invoices.AsNoTracking()
                where (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today)
                && (item.InvType == "I" || item.InvType == null)
                select item;

        if (manufacturerId.HasValue && manufacturerId.Value > 0)
            query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.ManufacturerId==manufacturerId));

        if (regionId.HasValue && regionId.Value > 0)
            query=query.Where(item=>item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(m=>m.RegionId==regionId.Value));

        if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
            query=query.Where(item=>item.Repair.Job.Vehicle.Model.VehicleTypes.Any(v=>v.Id==vehicleTypeId.Value));
    return query;
}
public static IQueryable<Report> ToReport(this IQueryable<Invoice> context)
{
    return (from item in query
                 group item by new { item.InvoiceDate.Month, item.Repair.Job.Bodyshop } into g
                 select new TReport
                 {
                     BodyshopId = g.Key.Bodyshop.Id,  
                     Month = g.Key.Month,
                     MonthAllJobTotal = g.Count()
                 });

}
}

var reports=db.Invoices.Recent.ToReport(); 

var reports=db.Invoices.Recent(ManufacturerEnum.Toyota).ToReport();

var query = context.Invoices.AsNoTracking().Where(item =>
    (item.InvType == "I" || item.InvType == null) &&
    (item.InvoiceDate >= date12monthago && item.InvoiceDate <= today));

if (regionId.HasValue && regionId.Value > 0)
    query = query.Where(item =>
        item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(source =>
            source.ManufacturerId == manufacturerId && source.RegionId == regionId.Value));
else
    query = query.Where(item => 
        item.Repair.Job.Bodyshop.Manufacturer2Bodyshop.Any(source => 
            source.ManufacturerId == manufacturerId));

if (vehicleTypeId.HasValue && vehicleTypeId.Value > 0)
    query = query.Where(item =>
        item.Repair.Job.Vehicle.Model.VehicleTypes.Any(vehicleType => 
            vehicleType.Id == vehicleTypeId.Value);

var query2 = query
    .GroupBy(item => new { Month = item.InvoiceDate.Month, BodyshopId = item.Repair.Job.Bodyshop.Id })
    .Select(g => new TReport { BodyshopId = g.Key.BodyshopId, Month = g.Key.Month, MonthAllJobTotal = g.Count() });

var result = query2.ToList();