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869690
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0
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0
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1
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2009-05-15T16:35:58.857
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2009-05-15T17:01:20.497
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2009-05-15T17:01:20.497
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7643
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869610
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2
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3
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You can get this information using AOP. You can define an intercept that is invoked before method execution and throw the exception there. This also takes care of the problem that null checking is a cross-cutting concern. <a href="http://www.postsharp.org/" rel="nofollow noreferrer">PostSharp</a> is a good simple implementation of AOP. Here's what your code would look like (haven't tested, but it should get you very close) <pre><code>[AttributeUsage(AttributeTargets.Parameter)] public class CanBeNullAttribute : Attribute { private readonly bool canBeNull; public CanBeNullAttribute() : this(true) { } public CanBeNullAttribute(bool canBeNull) { this.canBeNull = canBeNull; } public bool AllowNull { get { return canBeNull; } } } [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public class EnforceNullConstraintAttribute : OnMethodInvocationAspect { public override void OnInvocation(MethodInvocationEventArgs eventArgs) { object[] arguments = eventArgs.GetArgumentArray(); ParameterInfo[] parameters = eventArgs.Delegate.Method.GetParameters(); for (int i = 0; i < arguments.Length; i++) { if (arguments[i] != null) continue; foreach (CanBeNullAttribute attribute in parameters[i].GetCustomAttributes(typeof(CanBeNullAttribute), true)) { if (!attribute.AllowNull) throw new ArgumentNullException(parameters[i].Name); } } base.OnInvocation(eventArgs); } } </code></pre> Now, you can modify your method: <pre><code>[EnforceNullConstraint] public void Woof([CanBeNull(false)] object resource) { // no need to check for null, PostSharp will weave it at compile time // execute logic assured that "resource" is not null } </code></pre>
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1. POResolving a parameter name at runtime
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1. USMichael Meadows
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1. USMichael Meadows
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1. COI don't think I'd use it in this case, but that is a very interesting approach for the toolbox. Thanks for bringing it up!
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