Find a specific field on a site and the set it to "Required" in a EventReciever

Question

I have created a EventReciever that will be activated when a site gets created. This site have a announcement webpart. When they click on "add announcement", newform.aspx pops up as a dialog and there is a field there that is called Expired I need to make it required.

.-.

How can I find that specific field and set it to Required in my EventReciever?

<!-- FieldName="Expires"
             FieldInternalName="Expires"
             FieldType="SPFieldDateTime"
          -->

This is how I have progressed so far:

public override void FeatureActivated(SPFeatureReceiverProperties properties)
{

    if (properties.Feature.Parent is SPWeb)
    {
        var web = properties.Feature.Parent as SPWeb;
            var expiredDate = web.Fields.GetFieldByInternalName("Expires");
            expiredDate.Required = true;
            expiredDate.Update();

    }

}

Any kind of help or tips is appreciated!

Answer 1

I tried to work in some kind of a similar scenario as yours, however, i created an "Announcements" list and then added a web part that shows the content of that list. Then i used the code below to make the "Expires" field as "Required". I hope this will help:

        SPSite site = (SPSite)properties.Feature.Parent;
        SPWeb web = site.OpenWeb();
        SPList list = web.Lists.TryGetList("ListName");
        SPField field = list.Fields.GetField("Expires");
        if (field.Required == false)
        {
            field.Required = true;
            field.Update();
        }