Sitecore set multi reference field value programat

问题:

How to set a multi-reference field value programmatically if I have collection of items/ids?

E.g. Build following raw value "{guid1}|{guid2}|{guid3}..."

---

In my specific case I need to import a tree of items and on one level a parent was using children as repository and it also had a multi reference list to a subset of the children based on some criteria. I wanted to build a flexible list based on ordering or filtering and then set value of parent without making code specific to a list type - parent field can be any list.

E.g. Custom list with rule "where [is odd] orderby child desc" build for each Parent and set to field "Odd"

• Parent1 -> Parent1["Odd"] = 5
  
  • 2
  • 5
• Parent2 -> Parent2["Odd"] = 3,1
  • 1
  • 2
  • 3

回答1:

Use class Sitecore.Text.ListString to build the value

Example:

// Incomplete code snippet assumes variable Item item with list field "References" 
// and IEnumerable<ID> references

Sitecore.Text.ListString referencesValue = new Sitecore.Text.ListString();

foreach(ID id in references)
{
   string idString = id.ToString();
   if (!referencesValue.Contains(idString))
   {
       referencesValue.Add(idString);
   }
}    

item.Editing.BeginEdit();
item["References"] = referencesValue.ToString();
item.Editing.EndEdit();

回答2:

According to the cookbook link provided by Zachary, this seems to be the correct way to access such a field:

    Sitecore.Data.Fields.MultilistField multiselectField = item.Fields["multiselect"]

The individual members of the list returned by Sitecore.Data.Fields.MultilistField.GetItems() method are never Null. If a user has deleted an item without updating the references to that item, the GetItems() method excludes that item from its results. [...] You can add items to a supported field type using the Sitecore.Data.Fields.MulitlistField.Add() method, and remove items using the Sitecore.Data.Fields.MulitlistField.Remove() method.