Store complex object in TempData

Question

I\'ve been trying to pass data to an action after a redirect by using TempData like so:

if (!ModelState.IsValid)
{
    TempData[\"ErrorMessages\"] = ModelSta         


        

Answer 1

You can create the extension methods like this:

public static class TempDataExtensions
{
    public static void Put(this ITempDataDictionary tempData, string key, T value) where T : class
    {
        tempData[key] = JsonConvert.SerializeObject(value);
    }

    public static T Get(this ITempDataDictionary tempData, string key) where T : class
    {
        object o;
        tempData.TryGetValue(key, out o);
        return o == null ? null : JsonConvert.DeserializeObject((string)o);
    }
}

And, you can use them as follows:

Say objectA is of type ClassA. You can add this to the temp data dictionary using the above mentioned extension method like this:

TempData.Put("key", objectA);

And to retrieve it you can do this:

var value = TempData.Get("key") where value retrieved will be of type ClassA