jellyfin/MediaBrowser.Controller/Entities/TagExtensions.cs

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using System;
using System.Linq;
namespace MediaBrowser.Controller.Entities
{
public static class TagExtensions
{
public static void AddTag(this BaseItem item, string name)
{
if (string.IsNullOrWhiteSpace(name))
{
throw new ArgumentNullException(nameof(name));
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}
var current = item.Tags;
if (!current.Contains(name, StringComparer.OrdinalIgnoreCase))
{
if (current.Length == 0)
{
item.Tags = new[] { name };
}
else
{
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item.Tags = current.Concat(new [] { name }).ToArray();
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}
}
}
}
}