C#实现移除字符串末尾指定字符的方法

/// <summary>
/// 移除字符串末尾指定字符
/// </summary>
/// <param name="str">需要移除的字符串</param>
/// <param name="value">指定字符</param>
/// <returns>移除后的字符串</returns>
public static string RemoveLastChar(this string str, string value)
{
  int _finded = str.LastIndexOf(value);
  if (_finded != -1)
  {
 return str.Substring(0, _finded);
  }
  return str;
}

[TestMethod()]
public void RemoveLastCharTest()
{
  string _testString = "YANZHIWEI。";
  string _expected = "YANZHIWEI";
  string _actual = StringToolV2.RemoveLastChar(_testString, "。");
  Assert.AreEqual(_expected, _actual);
}