How to make foreach loop with custom class and List<> in class

Question

If i have this class:

    public class CacheClass
    {
        public string UserID { get; set; }
        public List<string> TabId { get; set; }
        public List<string> State { get; set; }
        public List<string> CanAdmin { get; set; }
    }

Then i add value to class and add to cache. I assign to my var type variable cache value:

    var k = System.Web.HttpContext.Current.Cache[objUserInfo.UserID.ToString()];

So, how i can get foreach loop with var k and get all value?

Patrick Hofman · Accepted Answer · 2015-06-26 12:20:44Z

6

As you will see k is an object (hover over var), since the Cache dictionary isn't strongly typed. The compiler doesn't know the actual type is CacheClass. So step 1 is to cast it. I would prefer to use as since it won't throw an exception if casting fails:

var k = System.Web.HttpContext.Current.Cache[objUserInfo.UserID.ToString()] as CacheClass;

Using as does require you to to do a null-check to make sure the cast went okay:

if (k != null)
{
    foreach (string x in k.State)
    {  }
}

edited Jun 26, 2015 at 12:20

answered Jun 26, 2015 at 12:09

Patrick Hofman

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7 Comments

user3093010 Over a year ago

But then i try assign to var k with as CacheClass I always get null. But without as CacheClass i get correct value.

Patrick Hofman Over a year ago

How and where do you save it then? Are you sure the key still matches?

user3093010 Over a year ago

Its testing data. Iam saving like that

List<string> temp1 = List<string>(); ... temp1.Add("tabid");...A.TabId=temp1;...System.Web.HttpContext.Current.Cache[objUserInfo.UserID.ToString()] = a; var j = System.Web.HttpContext.Current.Cache[objUserInfo.UserID.ToString()] as CacheList;

After button click.

Patrick Hofman Over a year ago

I think you are assigning that one to the cache, aren't you?

user3093010 Over a year ago

CacheClass a = new CacheClass(); Yes one.

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Eric Herlitz · Accepted Answer · 2015-06-26 12:09:39Z

2

You are probably missing the cast

var k = System.Web.HttpContext.Current.Cache[objUserInfo.UserID.ToString()] as CacheClass;
foreach(var state in k.State) {
    // ...
}

answered Jun 26, 2015 at 12:09

Eric Herlitz

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