LastIndexOf() [3/9]

int System.String.LastIndexOf ( char value, int startIndex, int count )

inline

Definition at line 3435 of file String.cs.

    {
        if (Length == 0)
        {
            return -1;
        }
        if ((uint)startIndex >= (uint)Length)
        {
            throw new ArgumentOutOfRangeException("startIndex", SR.ArgumentOutOfRange_Index);
        }
        if ((uint)count > (uint)(startIndex + 1))
        {
            throw new ArgumentOutOfRangeException("count", SR.ArgumentOutOfRange_Count);
        }
        int num = startIndex + 1 - count;
        int num2 = SpanHelpers.LastIndexOf(ref Unsafe.Add(ref _firstChar, num), value, count);
        if (num2 != -1)
        {
            return num2 + num;
        }
        return num2;
    }

References System.String._firstChar, System.SR.ArgumentOutOfRange_Count, System.SR.ArgumentOutOfRange_Index, System.count, System.SpanHelpers.LastIndexOf(), System.String.Length, System.startIndex, and System.value.