I have found this solution:
public static T GetAttributeFrom<T>(this object instance, string propertyName) where T : Attribute
{
var attrType = typeof(T);
var property = instance.GetType().GetProperty(propertyName);
return (T)property .GetCustomAttributes(attrType, false).First();
}
Code by jgauffin from How to retrieve Data Annotations from code
I always use the extension this way:
foo.GetAttributeFrom<StringLengthAttribute>(nameof(Foo.Bar)).MaximumLength
Is there a way to pass the propertyName by using a lambda like:
foo.GetAttributeFrom<StringLengthAttribute>(f => f.Bar).MaximumLength
Thank you in advance!
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