C# TrimStart with string parameter

Question

I\'m looking for String extension methods for TrimStart() and TrimEnd() that accept a string parameter.

I could build one myself but I\'m alw

Answer 1

To match entire string and not allocate multiple substrings, you should use the following:

    public static string TrimStart(this string source, string value, StringComparison comparisonType)
    {
        if (source == null)
        {
            throw new ArgumentNullException(nameof(source));
        }

        int valueLength = value.Length;
        int startIndex = 0;
        while (source.IndexOf(value, startIndex, comparisonType) == startIndex)
        {
            startIndex += valueLength;
        }

        return source.Substring(startIndex);
    }

    public static string TrimEnd(this string source, string value, StringComparison comparisonType)
    {
        if (source == null)
        {
            throw new ArgumentNullException(nameof(source));
        }

        int sourceLength = source.Length;
        int valueLength = value.Length;
        int count = sourceLength;
        while (source.LastIndexOf(value, count, comparisonType) == count - valueLength)
        {
            count -= valueLength;
        }

        return source.Substring(0, count);
    }