41 lines
1.3 KiB
C#
41 lines
1.3 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 specification which indicates the semantics opposite to the given specification.
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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 NotSpecification<T> : Specification<T>
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{
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#region Private Fields
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private ISpecification<T> spec;
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#endregion
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#region Ctor
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/// <summary>
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/// Initializes a new instance of <c>NotSpecification<T></c> class.
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/// </summary>
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/// <param name="specification">The specification to be reversed.</param>
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public NotSpecification(ISpecification<T> specification)
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{
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this.spec = specification;
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}
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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 body = Expression.Not(this.spec.GetExpression().Body);
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return Expression.Lambda<Func<T, bool>>(body, this.spec.GetExpression().Parameters);
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}
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#endregion
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}
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}
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