Retrieving the custom attribute value defined by my client

Question

I was trying to play with custom attributes of c#.

And as a part of this, consider this scenario: I have my client class which gives me a string to hash and specifies the hashing algorithm using custom attributes.

I was able to come up to this but stuck up when how to retrieve the custom attribute value.

class HashAlgorithmAttribute : Attribute { private string hashAlgorithm; public HashAlgorithmAttribute(string hashChoice) { this.hashAlgorithm= hashChoice; } } [HashAlgorithm("XTEA")] class ClientClass { public static string GetstringToBeHashed() { return "testString"; } } class ServerClass { public void GetHashingAlgorithm() { var stringToBeHashed = ClientClass.GetstringToBeHashed(); ///object[] hashingMethod = typeof(HashAlgorithm).GetCustomAttributes(typeof(HashAlgorithm), false); } }

Oliver · Accepted Answer · 2013-09-13 15:31:13Z

Using mocked up example of your attribute class:

[AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = true)] sealed class HashAlgorithmAttribute : Attribute { readonly string algorithm; public HashAlgorithmAttribute(string algorithm) { this.algorithm = algorithm; } public string Algorithm { get { return algorithm; } } }

And test class:

[HashAlgorithm("XTEA")] class Test { }

To get value:

var attribute = typeof(Test).GetCustomAttributes(true) .FirstOrDefault(a => a.GetType() == typeof(HashAlgorithmAttribute)); var algorithm = ""; if (attribute != null) { algorithm = ((HashAlgorithmAttribute)attribute).Algorithm; } Console.WriteLine(algorithm); //XTEA

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