JoinCore< T >()

static string System.String.JoinCore< T > ( ReadOnlySpan< char > separator, IEnumerable< T > values )

inlinestaticprivate

Definition at line 2121 of file String.cs.

    {
        if (typeof(T) == typeof(string))
        {
            if (values is List<string> list)
            {
                return JoinCore(separator, CollectionsMarshal.AsSpan(list));
            }
            if (values is string[] array)
            {
                return JoinCore(separator, new ReadOnlySpan<string>(array));
            }
        }
        if (values == null)
        {
            ThrowHelper.ThrowArgumentNullException(ExceptionArgument.values);
        }
        using IEnumerator<T> enumerator = values.GetEnumerator();
        if (!enumerator.MoveNext())
        {
            return Empty;
        }
        string text = enumerator.Current?.ToString();
        if (!enumerator.MoveNext())
        {
            return text ?? Empty;
        }
        Span<char> initialBuffer = stackalloc char[256];
        ValueStringBuilder valueStringBuilder = new ValueStringBuilder(initialBuffer);
        valueStringBuilder.Append(text);
        do
        {
            T current = enumerator.Current;
            valueStringBuilder.Append(separator);
            if (current != null)
            {
                valueStringBuilder.Append(current.ToString());
            }
        }
        while (enumerator.MoveNext());
        return valueStringBuilder.ToString();
    }

References System.array, System.String.Empty, System.Collections.Generic.Dictionary< TKey, TValue >.GetEnumerator(), System.String.JoinCore(), System.list, System.text, System.ThrowHelper.ThrowArgumentNullException(), and System.values.