C#实现将千分位字符串转换成数字的方法

/// <summary>
/// 将千分位字符串转换成数字
/// 说明：将诸如"–111,222,333的千分位"转换成-111222333数字
/// 若转换失败则返回-1
/// </summary>
/// <param name="thousandthStr">需要转换的千分位</param>
/// <returns>数字</returns>
public static int ParseThousandthString(this string thousandthStr)
{
  int _value = -1;
  if (!string.IsNullOrEmpty(thousandthStr))
  {
 try
 {
   _value = int.Parse(thousandthStr, NumberStyles.AllowThousands | NumberStyles.AllowDecimalPoint | NumberStyles.AllowLeadingSign);
 }
 catch (Exception ex)
 {
   _value = -1;
   Debug.WriteLine(string.Format("将千分位字符串{0}转换成数字异常，原因:{0}", thousandthStr, ex.Message));
 }
  }
  return _value;
}

[TestMethod()]
public void ParseThousandthStringTest()
{
  string _thousandthStr = "-111,222,333";
  int _expected1 = -111222333;
  int _actual1 = StringToolV2.ParseThousandthString(_thousandthStr);
  Assert.AreEqual(_expected1, _actual1);
}