Thread: string.Trim

You can always decompile the string.Trim() method to find out also:

Code:

public string Trim()
{
	return this.TrimHelper(2);
}

private string TrimHelper(int trimType)
{
	int num = this.Length - 1;
	int num2 = 0;
	if (trimType != 1)
	{
		num2 = 0;
		while (num2 < this.Length && char.IsWhiteSpace(this[num2]))
		{
			num2++;
		}
	}
	if (trimType != 0)
	{
		num = this.Length - 1;
		while (num >= num2 && char.IsWhiteSpace(this[num]))
		{
			num--;
		}
	}
	return this.CreateTrimmedString(num2, num);
}

private string CreateTrimmedString(int start, int end)
{
	int num = end - start + 1;
	if (num == this.Length)
	{
		return this;
	}
	if (num == 0)
	{
		return string.Empty;
	}
	return this.InternalSubString(start, num, false);
}

You can see that if the length doesn't change it just returns itself.