mcs/class/System.Web.Mvc3/Mvc/ExpressionUtil/ConstantExpressionFingerprint.cs

   1 #pragma warning disable 659 // overrides AddToHashCodeCombiner instead
   2
   3 namespace System.Web.Mvc.ExpressionUtil {
   4     using System;
   5     using System.Diagnostics.CodeAnalysis;
   6     using System.Linq.Expressions;
   7
   8     // ConstantExpression fingerprint class
   9     //
  10     // A ConstantExpression might represent a captured local variable, so we can't compile
  11     // the value directly into the cached function. Instead, a placeholder is generated
  12     // and the value is hoisted into a local variables array. This placeholder can then
  13     // be compiled and cached, and the array lookup happens at runtime.
  14
  15     [SuppressMessage("Microsoft.Usage", "CA2218:OverrideGetHashCodeOnOverridingEquals", Justification = "Overrides AddToHashCodeCombiner() instead.")]
  16     internal sealed class ConstantExpressionFingerprint : ExpressionFingerprint {
  17
  18         public ConstantExpressionFingerprint(ExpressionType nodeType, Type type)
  19             : base(nodeType, type) {
  20
  21             // There are no properties on ConstantExpression that are worth including in
  22             // the fingerprint.
  23         }
  24
  25         public override bool Equals(object obj) {
  26             ConstantExpressionFingerprint other = obj as ConstantExpressionFingerprint;
  27             return (other != null)
  28                 && this.Equals(other);
  29         }
  30
  31     }
  32 }