37 lines
1.4 KiB
C#
37 lines
1.4 KiB
C#
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using System;
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using System.Linq.Expressions;
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namespace MyCode.Project.Infrastructure
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{
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/// <summary>
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/// Represents the combined specification which indicates that the first specification
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/// can be satisifed by the given object whereas the second one cannot.
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/// </summary>
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/// <typeparam name="T">The type of the object to which the specification is applied.</typeparam>
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public class AndNotSpecification<T> : CompositeSpecification<T>
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{
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#region Ctor
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/// <summary>
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/// Constructs a new instance of <c>AndNotSpecification<T></c> class.
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/// </summary>
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/// <param name="left">The first specification.</param>
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/// <param name="right">The second specification.</param>
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public AndNotSpecification(ISpecification<T> left, ISpecification<T> right) : base(left, right) { }
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#endregion
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#region Public Methods
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/// <summary>
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/// Gets the LINQ expression which represents the current specification.
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/// </summary>
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/// <returns>The LINQ expression.</returns>
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public override Expression<Func<T, bool>> GetExpression()
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{
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var bodyNot = Expression.Not(Right.GetExpression().Body);
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var bodyNotExpression = Expression.Lambda<Func<T, bool>>(bodyNot, Right.GetExpression().Parameters);
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return Left.GetExpression().And(bodyNotExpression);
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}
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#endregion
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}
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}
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