[英]Why tolist takes too long for only 1 item?
我对 SQL Server 进行了存储过程调用,并尝试仅获取 1 个项目。 数据库立即返回,但是当我尝试使用ToList()
时它运行速度非常慢
public partial class Product: BaseEntity, ISlugSupported
{
public string Name { get; set; }
public int ManufacturerId { get; set; }
public string Sku { get; set; }
public decimal Price { get; set; }
public bool InStock { get; set; }
public int StockQuantity { get; set; }
public decimal ProductCostInUSD { get; set; }
public decimal ProductCostInUSDOldPrice { get; set; }
public decimal ProductCostInPound { get; set; }
public decimal ProductCostInEuro { get; set; }
public decimal ProductCostInVND { get; set; }
public bool Published { get; set; }
public decimal ExchangeRateUSD { get; set; }
public decimal ExchangeRateEuro { get; set; }
public decimal ExchangeRatePound { get; set; }
public DateTime CreatedDate { get; set; }
public DateTime UpdatedDate { get; set; }
public string Createdby { get; set; }
public int Status { get; set; }
public int? CategoryId { get; set; }
}
存储过程方法:
public class EFRepository<T> : IRepository<T> where T : BaseEntity
{
private readonly ApplicationDbContext _context;
private DbSet<T> _entities;
public EFRepository(ApplicationDbContext context)
{
this._context = context;
}
public IQueryable<T> ExecuteStoredProcedureList(string commandText, params object[] parameters)
{
return _context.Set<T>().FromSql(commandText, parameters);
}
}
数据库上下文:
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
base.OnModelCreating(builder);
builder.Entity<Product>()
.ToTable("Product")
.Ignore(p => p.ProductFinalCost);
}
}
调用存储过程:
var query = _productRepository.ExecuteStoredProcedureList("dbo.[SearchProducts] " +
"@Keywords, @PageIndex,@PageSize,@SortBy,@FromDate, @ToDate,@Sku,@CreateBy,@CategoryIds,@OrderIds,@ShowPublished,@Discontinued,@Discount,@LoadFilterableSpecificationAttributeOptionIds, @FilterableSpecificationAttributeOptionIds OUTPUT,@PriceMin,@PriceMax,@ShowExpiredProduct,@FilterableBrands OUTPUT,@TotalRecords OUTPUT,@FilteredSpecs, @FilteredBrands,@LoadSimple,@TrungvangPick",
pKeywords,
pPageIndex,
pPageSize,
pSortBy,
pFromDate,
pToDate,
pSku,
pCreatedBy,
pCategoryIds,
pOrderIds,
pShowPublished,
pDiscontinued,
pDiscount,
pLoadFilterableSpecificationAttributeOptionIds,
pFilterableSpecificationAttributeOptionIds,
pPriceMin,
pPriceMax,
pShowExpiredProduct,
pFilterableBrands,
pTotalRecords,
pFilteredSpecs,
pFilteredBrands,
pLoadSimple,
pTrungvangPick
);
var result = query.ToList();
int totalRecords = pTotalRecords.Value != DBNull.Value ? Convert.ToInt32(pTotalRecords.Value) : 0;
SQL Server 中的存储过程立即返回,因此这不是存储过程问题(在数据库上直接测试运行)。
正如您从 var 结果点到下一个命令所看到的,仅包含几个数字字段的 1 个简单项目ProductSimple
最多需要 467 毫秒,我尝试来回移动调试点以检查速度,它仍然保持在相同的时间。
在另一个项目中,此ToList()
对于相同的项目结构转换非常快。 我可能做错了什么?
我正在使用 ASP.NET Core 2.2.4 和 EF Core 2.2.4
查询不会立即返回。 在 .ToList 调用之前,查询实际上不会执行。
查询返回所需的时间取决于连接到数据库的时间以及查询的效率。
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