StackOverflow2013

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2010-12-09T10:02:11.630
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<p>I once made this class. Perhaps it helps:</p> <pre><code>public class GetterSetter<EntityType,propType> { private readonly Func<EntityType, propType> getter; private readonly Action<EntityType, propType> setter; private readonly string propertyName; private readonly Expression<Func<EntityType, propType>> propertyNameExpression; public EntityType Entity { get; set; } public GetterSetter(EntityType entity, Expression<Func<EntityType, propType>> property_NameExpression) { Entity = entity; propertyName = GetPropertyName(property_NameExpression); propertyNameExpression = property_NameExpression; //Create Getter getter = propertyNameExpression.Compile(); // Create Setter() MethodInfo method = typeof (EntityType).GetProperty(propertyName).GetSetMethod(); setter = (Action<EntityType, propType>) Delegate.CreateDelegate(typeof(Action<EntityType, propType>), method); } public propType Value { get { return getter(Entity); } set { setter(Entity, value); } } protected string GetPropertyName(LambdaExpression _propertyNameExpression) { var lambda = _propertyNameExpression as LambdaExpression; MemberExpression memberExpression; if (lambda.Body is UnaryExpression) { var unaryExpression = lambda.Body as UnaryExpression; memberExpression = unaryExpression.Operand as MemberExpression; } else { memberExpression = lambda.Body as MemberExpression; } var propertyInfo = memberExpression.Member as PropertyInfo; return propertyInfo.Name; } </code></pre> <p>test:</p> <pre><code>var gs = new GetterSetter<OnOffElement,bool>(new OnOffElement(), item => item.IsOn); gs.Value = true; var result = gs.Value; </code></pre>
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1. POCreating an performant open delegate for an property setter or getter
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1. USEmmanuel
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