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Billa
Billa

Reputation: 5266

Prepare enum list and find an enum value from List<enum>

I decided to write the below code for Access Control List permission check.

My database will return a record like EmployeeDetFeature,Create,Edit

I would like to Parse Create and add it to a Feature ACL enum list.

Also i need to find it later.

public enum ACL
{

    Create,
    Delete,
    Edit,
    Update,
    Execute
}  


public class Feature
{
    public int Id { get; set; }
    public string Name { get; set; }
    public List<ACL> ACLItems { get; set; }
}




public static class PermissionHelper
{
    public static bool CheckPermission(Role role, string featureName, ACL acl)
    {
        Feature feature = role.Features.Find(f =>f.Name == featureName);
        if (feature != null)
        {
            //Find the acl from enum and if exists return true
            return true;
        }
        return false;
    }
}

How do i make it with Enum collection preparation and find the same later for checking permission.

Upvotes: 2

Views: 232

Answers (2)

Stipo
Stipo

Reputation: 4606

If you are working on .NET 4.0, you can decorate ACL enum with Flags attribute and change your model a bit:

// Added Flags attribute.
[Flags]
public enum ACL
{
    None = 0,
    Create = 1,
    Delete = 2,
    Edit = 4,
    Update = 8,
    Execute = 16
}

public class Feature
{
    public int Id { get; set; }
    public string Name { get; set; }
    // ACLItems is not List anymore.
    public ACL ACLItems { get; set; }
}

Now you can use Enum.TryParse, like in the following example:

static void Main(string[] args)
{
    ACL aclItems = ACL.Create | ACL.Edit | ACL.Execute;

    var aclItemsString = aclItems.ToString();
    // aclItemsString value is "Create, Edit, Execute"

    ACL aclItemsOut;
    if (Enum.TryParse(aclItemsString, out aclItemsOut))
    {
        var areEqual = aclItems == aclItemsOut;
    }
}

Upvotes: 1

I4V
I4V

Reputation: 35363

Find the acl from enum and if exists return true

Something like this?

bool b= Enum.GetValues(typeof(ACL)).Cast<ACL>().Any(e => e == acl);

Upvotes: 3

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