How to write an Attribute in C#

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1.00/5 (1 vote)

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Hi,

I want to write a simple attribute (in attribute class) to do the following:
1. Get a user name.
2. Example (if the user name was equals "admin" go to index) do else redirect to login page.

-- Thanks in advance.

C#

[Permission("Admin")]
private Actionresult Index()
{
//do something
}
.....
Public class PermissionAttribute:Attribute
{
public PermissionAttribute(string Username)
{
//What must I do??
}
}

Posted 27-Feb-12 23:08pm

Alister007

Updated 1-Mar-12 13:42pm

Shahin Khorshidnia

v6

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Herman<T>.Instance 28-Feb-12 5:12am

is this homework?
what have you tried?

[no name] 28-Feb-12 5:25am

this is not home work
i want to write a simple Authorized attribute

Herman<T>.Instance 28-Feb-12 5:27am

good you have improved your question!

[no name] 28-Feb-12 5:28am

do you have a solution?

2 solutions

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Manfred Rudolf Bihy · Answer 1 · 2012-02-28T00:01:00

In your attribute class PermissionAttribute there is not much more to do than to store the users name. An attibute is just a method of decorating classes or methods with additional information it does not do any actual work. It can't really do any actual work as the attribute does not know anything of the class or method it decorates. If you want some introductory material regarding attributes please refer to the following links:

Introduction to Attributes[^]
- Using Attributes[^]
- Attribute Targets[^]
- Global Attributes[^]
- Creating Custom Attributes[^]
- Retrieving Information[^]

The last item is of special interest to you. In your code you need to find out if a certain class or method is decorated with the attribute(s) you generated. Your code then decides what to do when such an attribute is found and takes the appropriate actions. Data contracts and operation contracts are examples of using attributes in the .NET Framework.

Regards,

Manfred

pietvredeveld · Answer 2 · 2012-03-01T10:08:00

Solution 2

Since you're using MVC you should use the MVC AuthorizeAttribute Class[^] instate of write you're own. All you try to achieve is build in MVC for you :-).

Regards
Piet

Posted 1-Mar-12 10:08am

pietvredeveld