custom-attributes

I can't seem to understand why I should be happy with HTML5 allowing custom attributes? Why would I use them? zzzzBov I assume you're referencing the HTML5 [data-*] attributes. The advantage is that you can easily associate some scripting data (still semantic, but not for display) with your elements without having to insert inline javascript all over the place, and it will be valid HTML5. To do the same thing in HTML4 would require specifying a custom namespace, and add some namespaced attributes. Say you've got a list of items for sale, you may want to store the numeric price without trying

Is there an elegant way to get all the types in an assembly that have a custom attribute? So if I have a class [Findable] public class MyFindableClass {} I would like to be able to find it in a collection of types returned by Assembly.GetTypes(...) I can do it with a big vile hack, but I'm sure someone has a nicer way. I wouldn't think you can dodge enumerating every type in the assembly, checking for the attribute, but you could use LINQ to make the query easier to understand: Assembly assembly = ... var types = from type in assembly.GetTypes() where Attribute.IsDefined(type, typeof

I have an enum where each member has a custom attribute applied to it. How can I retrieve the value stored in each attribute? Right now I do this: var attributes = typeof ( EffectType ).GetCustomAttributes ( false ); foreach ( object attribute in attributes ) { GPUShaderAttribute attr = ( GPUShaderAttribute ) attribute; if ( attr != null ) return attr.GPUShader; } return 0; Another issue is, if it's not found, what should I return? 0 is implcity convertible to any enum, right? That's why I returned that. Forgot to mention, the above code returns 0 for every enum member. It is a bit messy to do

I just want to put conditional Required Attribute which is work with WEB API Example public sealed class EmployeeModel { [Required] public int CategoryId{ get; set; } public string Email{ get; set; } // If CategoryId == 1 then it is required } I am using Model State validation via ( ActionFilterAttribute ) You can implement your own ValidationAttribute . Perhaps something like this: public class RequireWhenCategoryAttribute : ValidationAttribute { protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var employee = (EmployeeModel) validationContext

Let's say I have a class called Test with one property called Title with a custom attribute: public class Test { [DatabaseField("title")] public string Title { get; set; } } And an extension method called DbField. I am wondering if getting a custom attribute from an object instance is even possible in c#. Test t = new Test(); string fieldName = t.Title.DbField(); //fieldName will equal "title", the same name passed into the attribute above Can this be done? Here is an approach. The extension method works, but it's not quite as easy. I create an expression and then retrieve the custom attribute

I need change attribute’s paramater during runtime. I simplified my problem to simple example. Attribute class: [AttributeUsage(AttributeTargets.Property)] public class MyAttribute : Attribute { public string Name { get; set; } } Simple entity wich has decorated properties with attributes: public class MyEntity { [MyAttribute(Name="OldValue1")] public string Data1{ get; set; } [MyAttribute(Name = "OldValue2")] public string Data2 { get; set; } } I created instace of class MyEntity. I can change value of object’s properties, but I can’t change value of attribute’s property Name on object entity

I have a custom attribute: public class MenuItemAttribute : Attribute { } and a class with a few methods: public class HelloWorld { [MenuItemAttribute] public void Shout() { } [MenuItemAttribute] public void Cry() { } public void RunLikeHell() { } } How can I get only the methods that are decorated with the custom attribute? So far, I have this: string assemblyName = fileInfo.FullName; byte[] assemblyBytes = File.ReadAllBytes(assemblyName); Assembly assembly = Assembly.Load(assemblyBytes); foreach (Type type in assembly.GetTypes()) { System.Attribute[] attributes = System.Attribute