基本信息
源码名称:hosts 修改实例源码
源码大小:4.50KB
文件格式:.cs
开发语言:C#
更新时间:2013-10-29
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   源码介绍


        //删除指定域名的所有映射 throws Exception
        private void DeleteHostMapping(string strDomain)
        {
            if (!File.Exists(hostMappingFile))
            {
                MessageBox.Show("未执行删除!\n文件不存在:\n"   hostMappingFile, "提示");
                return;
            }
            //有效映射行(行首到IP地址之间有0个以上空白字符,IP与域名间有1个以上空白字符,行末0个以上注释)
            Regex regMapping = new Regex(@"^\s*\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s "   strDomain   @"\s*(#.*)*$");

            //待写入文件的内容
            StringBuilder sbFinalContent = new StringBuilder();
            //待删除域名映射(正常情况下只会有一条记录,考虑文件被手工修改的情况,需要删除全部映射,新的域名映射才会生效)
            List<string> host2Delete = new List<string>();

            //删除(读取系统原有映射,过滤掉指定域名的映射)
            using (StreamReader sr = new StreamReader(hostMappingFile))
            {
                string tmpLine = sr.ReadLine();
                while (tmpLine != null)
                {
                    if (regMapping.IsMatch(tmpLine))
                    {
                        host2Delete.Add(tmpLine);
                    }
                    else
                    {
                        sbFinalContent.Append(tmpLine);
                        sbFinalContent.AppendLine();
                    }
                    tmpLine = sr.ReadLine();
                }
            }

            //不存在,所以文件没做更改,无需写入覆盖
            if (host2Delete.Count==0)
            {
                MessageBox.Show("指定域名不存在!", "提示");
                return;
            }
            StringBuilder sbConfirmMsg = new StringBuilder();
            sbConfirmMsg.Append("以下域名将被删除:\n");
            foreach (string host in host2Delete)
            {
                sbConfirmMsg.Append(host);
                sbConfirmMsg.AppendLine();
            }
            if (MessageBox.Show(sbConfirmMsg.ToString(), "确认", MessageBoxButtons.OKCancel) != DialogResult.OK)
            {
                return;
            }

            using (StreamWriter sw = new StreamWriter(hostMappingFile))
            {
                sw.Write(sbFinalContent.ToString());
            }
            MessageBox.Show("删除成功!", "提示");

        }

        //添加新映射 throws Exception
        private void AddNewHostMapping(string strDomain, string strIP, string strRemark)
        {
            //待写入文件的内容
            StringBuilder sbFinalContent = new StringBuilder();

            //读取系统原有映射(同时检验所添加的映射是否已存在)
            if (File.Exists(hostMappingFile))
            {
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;//有效映射行(行首到IP地址之间有0个以上空白字符,IP与域名间有1个以上空白字符,行末0个以上注释)
&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Regex regMapping = new Regex(@"^\s*\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\s "   strDomain   @"\s*(#.*)*$");

                using (StreamReader sr = new StreamReader(hostMappingFile))
                {
                    string tmpLine = sr.ReadLine();
                    while (tmpLine != null)
                    {
                        if (regMapping.IsMatch(tmpLine))
                        {
                            MessageBox.Show("域名已存在:\n"   tmpLine, "提示");
                            return;
                        }

                        sbFinalContent.Append(tmpLine);
                        sbFinalContent.AppendLine();

                        tmpLine = sr.ReadLine();
                    }
                }
            }

            StringBuilder sbNewMapping = new StringBuilder();
            sbNewMapping.Append(strIP.PadRight(15));//IP长度对齐,易读
            sbNewMapping.Append(" ");
            sbNewMapping.Append(strDomain);
            sbNewMapping.Append("  #");
            sbNewMapping.Append(strRemark);
            sbNewMapping.Append(" added ");
            sbNewMapping.Append(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            
            if (MessageBox.Show("添加域名:\n" sbNewMapping.ToString(), "确认", MessageBoxButtons.OKCancel) != DialogResult.OK)
            {
                return;
            }

            //新映射
            sbFinalContent.Append(sbNewMapping);

            using (StreamWriter sw = new StreamWriter(hostMappingFile))
            {
                sw.Write(sbFinalContent.ToString());
            }
            MessageBox.Show("添加成功!", "提示");

        }