public static IQueryable <T> Wrap <T, M>(this IQueryable <M> queryable) where T : IEntity where M : IEntity, T { WrappedQueryableProvider <T, M> provider = new WrappedQueryableProvider <T, M>(queryable.Provider); return(provider.CreateQuery <T>(queryable.Expression)); }
public WrappedQueryable(WrappedQueryableProvider <T, M> provider, Expression expression) { if (expression == null) { throw new ArgumentNullException(nameof(expression)); } if (provider == null) { throw new ArgumentNullException(nameof(provider)); } Expression = expression; Provider = provider; }
public static IQueryable <M> Unwrap <T, M>(this IQueryable <T> queryable) where T : IEntity where M : IEntity, T { WrappedQueryable <T, M> wrapped = queryable as WrappedQueryable <T, M>; if (wrapped == null) { throw new NotSupportedException("不支持的类型。"); } WrappedQueryableProvider <T, M> provider = wrapped.Provider; var visitor = new ExpressionWrapper <T, M>(); var expression = visitor.Visit(wrapped.Expression); return(provider.InnerQueryProvider.CreateQuery <M>(expression)); }
public WrappedOrderedQueryable(WrappedQueryableProvider <T, M> provider, Expression expression) : base(provider, expression) { }