StringBuilderCache.cs

Go to the documentation of this file.

namespace System.Text;
 
internal static class StringBuilderCache
{
    [ThreadStatic]
    private static StringBuilder t_cachedInstance;
 
    public static StringBuilder Acquire(int capacity = 16)
    {
        if (capacity <= 360)
        {
            StringBuilder stringBuilder = t_cachedInstance;
            if (stringBuilder != null && capacity <= stringBuilder.Capacity)
            {
                t_cachedInstance = null;
                stringBuilder.Clear();
                return stringBuilder;
            }
        }
        return new StringBuilder(capacity);
    }
 
    public static void Release(StringBuilder sb)
    {
        if (sb.Capacity <= 360)
        {
            t_cachedInstance = sb;
        }
    }
 
    public static string GetStringAndRelease(StringBuilder sb)
    {
        string result = sb.ToString();
        Release(sb);
        return result;
    }
}