This is my code:

public static class Authorisation
{
    public static List<PermissionMatrix> GetMatrixData()
    {
        List<PermissionMatrix> matrixList = new List<PermissionMatrix>()
        {
             new PermissionMatrix()
                {
                   ActorName= "SubmitterUser",
                   Moduledata = new List<Module>()
                    {
                         new Module()
                         {
                              moduleName= ModuleName.GeneralFormModule,
                               rights=AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName=ModuleName.AttachmentsModule,
                               rights=AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName= ModuleName.ProcurementModule,
                               rights= AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName= ModuleName.SupplierModule,
                               rights=AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName= ModuleName.DataPrivacyModule,
                               rights=AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName=ModuleName.SecurityModule,
                               rights=AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName = ModuleName.SecurityModuleUserComments,
                              rights = AccessRights.Edit
                         },
                         new Module()
                         {
                              moduleName= ModuleName.SecurityModuleRiskLikelihood,
                              rights =AccessRights.Edit
                         },
                         new Module()
                         {
                             moduleName= ModuleName.SecurityModuleRiskSeverity,
                             rights = AccessRights.Edit
                         },
                         new Module()
                         {
                             moduleName = ModuleName.SecurityModuleRiskYesNo,
                             rights = AccessRights.Edit
                         },
                         new Module()
                         {
                             moduleName = ModuleName.SecurityModuleSecurityComments,
                             rights = AccessRights.ReadOnly
                         }

                    }
                 },
              
                 },

        };
        return matrixList;

    }
}
public class PermissionMatrix
{
    public String? ActorName;
    public List<Module>? Moduledata;

}

public class Module
{
    public ModuleName? moduleName;
    public AccessRights? rights;
}

public enum ModuleName
{
    GeneralFormModule,
    AttachmentsModule,
    ProcurementModule,
    SupplierModule,
    DataPrivacyModule,
    SecurityModule,
    SecurityModuleRiskYesNo,
    SecurityModuleRiskSeverity,
    SecurityModuleRiskLikelihood,
    SecurityModuleUserComments,
    SecurityModuleSecurityComments

}

public enum AccessRights
{
    Show = 0,
    ReadOnly = 1,
    Edit = 2

}

Now I have to write a function which will pass the actorName and ModuleName and I want to get the permission back from the function.

I used extensionmethod like this.

 public static class PermissionExtensions
    {
        public static PermissionMatrix GetAllbyUserName(this IList<PermissionMatrix> coordinates, string user)
        {
           

            return coordinates.First(c => String.Equals(c.ActorName, user, StringComparison.CurrentCultureIgnoreCase));
        }

        public static AccessRights GetAccessPermissionsByUserandModuleName(this IList<PermissionMatrix> coordinates, string user, ModuleName)
        {
            //return ?

           
        }


    }

I tried putting extension methods GetAllbyUserName - I was able to write the function but for GetAccessPermissionsByUserandModuleName - How to write a concise function ?

CodePudding user response：

First a warning: you are using Enumerable.First which throws an exception if there's no matching PermissionMatrix. You should use FirstOrDefault which returns the default value(null).

Also note that i changed the return type of your extension method to AccessRights? since it's possible that no one matches, so you have to return Nullable<AccessRights>:

public static AccessRights? GetAccessPermissionsByUserandModuleName(this IList<PermissionMatrix> coordinates, string user, ModuleName module)
{
    return coordinates
        .FirstOrDefault(c => string.Equals(c?.ActorName, user, StringComparison.CurrentCultureIgnoreCase))?
        .Moduledata?
        .Where(m => m.moduleName == module)
        .Select(m => m.rights)
        .FirstOrDefault();
}