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Questions tagged [.net-attributes]

The tag `.Net attributes` describes anything related to using or creating attributes in .net source code. It is specifically meant for classes derived from the `System.Attribute` type.

.Net attributes describe the creation and usage of attribute classes in .Net program code (C#, VB.Net or otherwise). .Net attributes are derived of the System.Attribute class, and can be applied to methods, classes or assemblies.

Assembly version is described using Assembly attributes:

// Set version number for the assembly.
[assembly:AssemblyVersionAttribute("4.3.2.1")]

Classes can be decorated with attributes to denote special usage:

[TestClass]
public class MyTests 
{
    ..
}

Methods can be decorated using attributes:

[TestMethod]
public void MyFirstUnitTest() { .. }

Even parameters can be decorated using attributes.

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Most Useful Attributes

I know that attributes are extremely useful. There are some predefined ones such as [Browsable(false)] which allows you to hide properties in the properties tab. Here is a good question explaining attributes: What are attributes in .NET? What are…
wusher
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Getting attributes of Enum's value

I would like to know if it is possible to get attributes of the enum values and not of the enum itself? For example, suppose I have the following enum: using System.ComponentModel; // for DescriptionAttribute enum FunkyAttributesEnum { …
Alex K
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Why does C# forbid generic attribute types?

This causes a compile-time exception: public sealed class ValidatesAttribute : Attribute { } [Validates] public static class StringValidation { } I realize C# does not support generic attributes. However, after much Googling, I can't…
Bryan Watts
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What does [STAThread] do?

I am learning C# 3.5 and I want to know what [STAThread] does in our programs?
odiseh
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Find a private field with Reflection?

Given this class class Foo { // Want to find _bar with reflection [SomeAttribute] private string _bar; public string BigBar { get { return this._bar; } } } I want to find the private item _bar that I will mark with…
David Basarab
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What are attributes in .NET?

What are attributes in .NET, what are they good for, and how do I create my own attributes?
Corey
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displayname attribute vs display attribute

What is difference between DisplayName attribute and Display attribute in ASP.NET MVC?
Ghooti Farangi
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What does the [ApiController] attribute do?

I've noticed it is the same thing if this attribute is used or not. Am I wrong? As an example: [Route("[controller]")] [ApiController] public class DataTablesController: ControllerBase { [HttpGet] public IActionResult Test() { …
ilyas varol
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Enforce Attribute Decoration of Classes/Methods

Following on from my recent question on Large, Complex Objects as a Web Service Result. I have been thinking about how I can ensure all future child classes are serializable to XML. Now, obviously I could implement the IXmlSerializable interface and…
Rob Cooper
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Can I fail to deserialize with XmlSerializer in C# if an element is not found?

I am using XmlSerializer to write and read an object to xml in C#. I currently use the attributes XmlElement and XmlIgnore to manipulate the serialization of the object. If my xml file is missing an xml element that I require, my object still…
Alex B
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Curious ambiguity in attribute specification (two using directives)

Background: In an attribute specification, there is sometimes two valid ways to write the applied attribute. For example, if an attribute class has the name HorseAttribute, you can apply the attribute as either [HorseAttribute] or just [Horse].…
Jeppe Stig Nielsen
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ResolutionGroupName and multiple effects

I have created a folder called Effects, which should contain all the effects for my project. It has one effect in it with the following attribution: [assembly: ResolutionGroupName("Effects")] [assembly:…
testing
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Attribute with params object[] constructor gives inconsistent compiler errors

I am getting the error An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type Notice the screenshot below: Notice that if I use the DataRow attribute with one or three…
Dan Friedman
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Real world use of custom .NET attributes

What kind of things have you used custom .NET attributes for in the real world? I've read several articles about them, but I have never used custom attributes. I feel like I might be overlooking them when they could be useful. I am talking about…
TWA
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What is the "module" keyword in C# .NET?

I am learning C# and came across the keyword module. I would like to know what this module keyword in C# is and how it is useful. For example, consider the below code: [module: Test] public class TestAttribute : Attribute { }
gnagesh
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