public bool IsUnique <TModel>(IEntitySpecification <TModel> specification)
where TModel : PersistentObject
{
var inputValueIsUnique = _counter.CountByProperty(specification) == 0;
return(inputValueIsUnique);
}
/// <summary>
/// 异步规约求值列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <param name="cancellationToken">给定的 <see cref="CancellationToken"/>（可选）。</param>
/// <returns>返回一个包含 <see cref="List{T}"/> 的异步操作。</returns>
public static async Task <IList <T> > EvaluateListAsync <T>(this IQueryable <T> queryable,
IEntitySpecification <T>?specification = null, CancellationToken cancellationToken = default)
where T : class
{
if (specification is null)
{
return(await queryable.ToListAsync(cancellationToken));
}
return(await specification.Evaluate(queryable).ToListAsync(cancellationToken));
}
/// <summary>
/// 规约求值列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <returns>返回 <see cref="List{T}"/>。</returns>
public static IList <T> EvaluateList <T>(this IQueryable <T> queryable,
IEntitySpecification <T>?specification = null)
where T : class
{
if (specification is null)
{
return(queryable.ToList());
}
return(specification.Evaluate(queryable).ToList());
}
public int CountByProperty <TModel>(IEntitySpecification <TModel> specification) where TModel : PersistentObject
{
var property = UINameHelper.BuildNameFrom(specification.PropertyExpression);
var criteria = GetSession().CreateCriteria(typeof(TModel));
criteria.Add(Restrictions.Eq(property, specification.Value));
if (specification.HasExistingId)
{
criteria.Add(Restrictions.Not(Restrictions.Eq(PersistentObject.ID, specification.ExistingId)));
}
return(criteria.List <TModel>().Count());
}
/// <summary>
/// 规约求值分页列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <returns>返回 <see cref="IPagingList{T}"/>。</returns>
public static IPagingList <T> EvaluatePagingList <T>(this IQueryable <T> queryable,
Action <IPagingList <T> > pageAction,
IEntitySpecification <T>?specification = null)
where T : class
{
IPagingList <T> list = new PagingList <T>(queryable);
if (specification is not null)
{
list.Filtrate(query => specification.Evaluate(queryable));
}
pageAction(list);
return(list);
}
/// <summary>
/// 规约求值分页列表。
/// </summary>
/// <typeparam name="T">指定的类型。</typeparam>
/// <param name="queryable">给定的 <see cref="IQueryable{T}"/>。</param>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{T}"/>（可选）。</param>
/// <param name="cancellationToken">给定的 <see cref="CancellationToken"/>（可选）。</param>
/// <returns>返回一个包含 <see cref="PagingList{T}"/> 的异步操作。</returns>
public static Task <IPagingList <T> > EvaluatePagingListAsync <T>(this IQueryable <T> queryable,
Action <IPagingList <T> > pageAction, IEntitySpecification <T>?specification = null,
CancellationToken cancellationToken = default)
where T : class
{
IPagingList <T> list = new PagingList <T>(queryable);
if (specification is not null)
{
list.Filtrate(query => specification.Evaluate(queryable));
}
return(cancellationToken.RunTask(() =>
{
pageAction(list);
return list;
}));
}
public double Distance(IEntitySpecification item, IMetricItem centroid)
{
var sumSquaredDiffs = Math.Pow(item.Height - centroid.Height, 2) + Math.Pow(item.Weight - centroid.Weight, 2);
return(Math.Sqrt(sumSquaredDiffs));
}
/// <summary>
/// 异步查找带有规约的实体分页集合。
/// </summary>
/// <typeparam name="TEntity">指定的实体类型。</typeparam>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{TEntity}"/>（可选）。</param>
/// <param name="cancellationToken">给定的 <see cref="CancellationToken"/>（可选）。</param>
/// <returns>返回一个包含 <see cref="IPagingList{TEntity}"/> 的异步操作。</returns>
public override Task<IPagingList<TEntity>> FindPagingListWithSpecificationAsync<TEntity>(Action<IPagingList<TEntity>> pageAction,
IEntitySpecification<TEntity>? specification = null, CancellationToken cancellationToken = default)
where TEntity : class
=> ReadingEquilizer.InvokeGetLast(a => a.FindPagingListWithSpecificationAsync(pageAction, specification, cancellationToken));
/// <summary>
/// 查找带有规约的实体分页集合。
/// </summary>
/// <typeparam name="TEntity">指定的实体类型。</typeparam>
/// <param name="pageAction">给定的分页动作。</param>
/// <param name="specification">给定的 <see cref="IEntitySpecification{TEntity}"/>（可选）。</param>
/// <returns>返回 <see cref="IPagingList{TEntity}"/>。</returns>
public override IPagingList<TEntity> FindPagingListWithSpecification<TEntity>(Action<IPagingList<TEntity>> pageAction,
IEntitySpecification<TEntity>? specification = null)
where TEntity : class
=> ReadingEquilizer.InvokeGetLast(a => a.FindPagingListWithSpecification(pageAction, specification));
/// <summary>
/// 查找带有规约的实体集合。
/// </summary>
/// <typeparam name="TEntity">指定的实体类型。</typeparam>
/// <param name="specification">给定的 <see cref="IEntitySpecification{TEntity}"/>（可选）。</param>
/// <returns>返回 <see cref="IList{TEntity}"/>。</returns>
public override IList<TEntity> FindListWithSpecification<TEntity>(IEntitySpecification<TEntity>? specification = null)
where TEntity : class
=> ReadingEquilizer.InvokeGetLast(a => a.FindListWithSpecification(specification));
public int CountByProperty <T>(IEntitySpecification <T> specification) where T : PersistentObject
{
Specification = (IEntitySpecification <TModel>)specification;
return(_count);
}
