关键代码：

        /// <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;        }

单元测试：

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

<style type="text/css">.csharpcode, .csharpcode pre{ font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/}.csharpcode pre { margin: 0em; }.csharpcode .rem { color: #008000; }.csharpcode .kwrd { color: #0000ff; }.csharpcode .str { color: #006080; }.csharpcode .op { color: #0000c0; }.csharpcode .preproc { color: #cc6633; }.csharpcode .asp { background-color: #ffff00; }.csharpcode .html { color: #800000; }.csharpcode .attr { color: #ff0000; }.csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em;}.csharpcode .lnum { color: #606060; }</style>测试结果：

希望有所帮助！