/// <summary>
/// Either add a new item, or if it already exists, update it.
/// </summary>
/// <typeparam name="T">Key type.</typeparam>
/// <typeparam name="J">Value type.</typeparam>
/// <param name="source">The source.</param>
/// <param name="prop">The property.</param>
/// <returns>IDictionary<T, J>.</returns>
public static IDictionary <T, J> AddOrUpdate <T, J>(this IDictionary <T, J> source, KeyValuePair <T, J> prop)
{
if (!source.TryAdd(prop.Key, prop.Value))
{
source[prop.Key] = prop.Value;
}
return(source);
}
/// <summary>
/// Either add a new item, or if it already exists, update it.
/// </summary>
/// <typeparam name="T">Key type.</typeparam>
/// <typeparam name="J">Value type.</typeparam>
/// <param name="source">The source.</param>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
/// <returns>IDictionary<T, J>.</returns>
public static IDictionary <T, J> AddOrUpdate <T, J>(this IDictionary <T, J> source, T key, J value)
{
if (!source.TryAdd(key, value))
{
source[key] = value;
}
return(source);
}