C#QuotedStr方法实现,引号的处理

        protected string QuotedStr(string S)
        {
            string vResult;
            vResult = S;
            for (int i = vResult.Length-1; i >= 0; i--)
            {
                if (vResult[i].Equals('\''))
                {
                    vResult=vResult.Insert(i, "\'");
                }
            }
            vResult = "'" + vResult + "'";
            return vResult;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string vString,vTemp,vCondition;
            vString = "ab'cd";
            vCondition = string.Format("ProjectName= {0}", QuotedStr(vString));
            MessageBox.Show(vCondition);
        }