Asp.Net中类型的转换类有哪些

/// <summary> /// 类型转换类 /// 处理数据库获取字段为空的情况 /// </summary> public static class DBConvert { #region------------------ToInt32类型转换------------------ /// <summary> /// 读取数据库中字符串并转换成Int32 /// 为空时返回0 /// </summary> /// <param name="obj">object类型的值</param> /// <returns>Int32类型</returns> public static int ToInt32(object obj) { int result = 0; if (IsInt(Convert.ToString(obj))) { result = Convert.ToInt32(obj); } else if (obj != null && obj is Enum) //处理非null值类型时(或者枚举) { result = ((IConvertible)obj).ToInt32(null); } return result; } /// <summary> /// 读取数据库中字符串并转换成Int32 /// 为空时返回0 /// </summary> /// <param name="str">string类型的值</param> /// <returns>Int32类型</returns> public static int ToInt32(string str) { int result = 0; if (IsInt(str)) { result = Convert.ToInt32(str); } return result; } /// <summary> /// 判断一个字符串是否属于Int类型 /// 如果是的返回true，如果不是返回false /// </summary> /// <param name="str">string类型的值</param> /// <returns>true：是Int的字符串(即可以转换成Int类型)，false：不是Int类型的字符串</returns> public static bool IsInt(string str) { bool result = false; if (str != "" && str!=null) { Regex reg = new Regex("^[0-9]*$"); if (reg.IsMatch(str)) { result = true; } } return result; } #endregion #region------------------ToString类型转换------------------ /// <summary> /// 读取数据库中字符串并转换成string /// </summary> /// <param name="obj">object类型的值</param> /// <returns>string类型</returns> public static string ToString(object obj) { string result = ""; if (obj != null) { result = Convert.ToString(obj); } return result; } #endregion #region------------------ToDouble类型转换------------------ /// <summary> /// 判断一个字符串是否属于Double类型(包括负浮点型) /// 如果是的返回true，如果不是返回false /// </summary> /// <param name="str">string类型的值</param> /// <returns>true：是Double的字符串(即可以转换成Double类型)，false：不是Double类型的字符串</returns> public static bool IsDouble(string str) { bool result = false; if (str != "" && str != null) { Regex reg = new Regex(@"^(-?\d+)(\.\d+)?$"); if (reg.IsMatch(str)) { result = true; } } return result; } /// <summary> /// 读取数据库中字符串并转换成Int32 /// 为空时返回0 /// </summary> /// <param name="obj">object类型的值</param> /// <returns>Int32类型</returns> public static double ToDouble(object obj) { double result = 0.0; if (IsDouble(Convert.ToString(obj))) { result = Convert.ToDouble(obj); } else if (obj != null && obj is Enum) //处理枚举 { result = ((IConvertible)obj).ToDouble(null); } return result; } /// <summary> /// 读取数据库中字符串并转换成Int32 /// 为空时返回0 /// </summary> /// <param name="str">string类型的值</param> /// <returns>Int32类型</returns> public static double ToDouble(string str) { double result = 0.0; if (IsDouble(str)) { result = Convert.ToDouble(str); } return result; } #endregion #region------------------ToDateTime类型转换------------------ /// <summary> /// 判断时间格式是否是时间类型 /// 如23:10 /// </summary> /// <param name="str">要判断的字符串</param> /// <returns>true：是时间类型的字符串(即可以转换成时间类型)，false：不是时间类型的字符串</returns> public static bool isDateTime(string str) { bool result = false; if (str != "" && str != null) { Regex reg = new Regex("(([01]\\d)|(2[0-3])):[0-5]\\d"); if (reg.IsMatch(str)) { result = true; } } return result; } #endregion } } //"^\d+(\.\d+)?$"　　//非负浮点数（正浮点数 + 0） //"^(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*))$"　　//正浮点数 //"^((-\d+(\.\d+)?)|(0+(\.0+)?))$"　　//非正浮点数（负浮点数 + 0） //"^(-(([0-9]+\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\.[0-9]+)|([0-9]*[1-9][0-9]*)))$"　　//负浮点数 //"^(-?\d+)(\.\d+)?$"　　//浮点数

public class PageValidate { private static Regex RegPhone = new Regex("^[0-9]+[-]?[0-9]+[-]?[0-9]$"); private static Regex RegNumber = new Regex("^[0-9]+$"); private static Regex RegNumberSign = new Regex("^[+-]?[0-9]+$"); private static Regex RegDecimal = new Regex("^[0-9]+[.]?[0-9]+$"); private static Regex RegDecimalSign = new Regex("^[+-]?[0-9]+[.]?[0-9]+$"); //等价于^[+-]?\d+[.]?\d+$ private static Regex RegEmail = new Regex("^[\\w-]+@[\\w-]+\\.(com|net|org|edu|mil|tv|biz|info)$");//w 英文字母或数字的字符串，和 [a-zA-Z0-9] 语法一样 private static Regex RegCHZN = new Regex("[\u4e00-\u9fa5]"); public PageValidate() { } //数字字符串检查#region 数字字符串检查 public static bool IsPhone(string inputData) { Match m = RegPhone.Match(inputData); return m.Success; } /**//// <summary> /// 检查Request查询字符串的键值，是否是数字，最大长度限制 /// </summary> /// <param name="req">Request</param> /// <param name="inputKey">Request的键值</param> /// <param name="maxLen">最大长度</param> /// <returns>返回Request查询字符串</returns> public static string FetchInputDigit(HttpRequest req, string inputKey, int maxLen) { string retVal = string.Empty; if(inputKey != null && inputKey != string.Empty) { retVal = req.QueryString[inputKey]; if(null == retVal) retVal = req.Form[inputKey]; if(null != retVal) { retVal = SqlText(retVal, maxLen); if(!IsNumber(retVal)) retVal = string.Empty; } } if(retVal == null) retVal = string.Empty; return retVal; } /**//// <summary> /// 是否数字字符串 /// </summary> /// <param name="inputData">输入字符串</param> /// <returns></returns> public static bool IsNumber(string inputData) { Match m = RegNumber.Match(inputData); return m.Success; } /**//// <summary> /// 是否数字字符串可带正负号 /// </summary> /// <param name="inputData">输入字符串</param> /// <returns></returns> public static bool IsNumberSign(string inputData) { Match m = RegNumberSign.Match(inputData); return m.Success; } /**//// <summary> /// 是否是浮点数 /// </summary> /// <param name="inputData">输入字符串</param> /// <returns></returns> public static bool IsDecimal(string inputData) { Match m = RegDecimal.Match(inputData); return m.Success; } /**//// <summary> /// 是否是浮点数可带正负号 /// </summary> /// <param name="inputData">输入字符串</param> /// <returns></returns> public static bool IsDecimalSign(string inputData) { Match m = RegDecimalSign.Match(inputData); return m.Success; } #endregion //中文检测#region 中文检测 /**//// <summary> /// 检测是否有中文字符 /// </summary> /// <param name="inputData"></param> /// <returns></returns> public static bool IsHasCHZN(string inputData) { Match m = RegCHZN.Match(inputData); return m.Success; } #endregion //邮件地址#region 邮件地址 /**//// <summary> /// 是否是浮点数可带正负号 /// </summary> /// <param name="inputData">输入字符串</param> /// <returns></returns> public static bool IsEmail(string inputData) { Match m = RegEmail.Match(inputData); return m.Success; } #endregion //其他#region 其他 /**//// <summary> /// 检查字符串最大长度，返回指定长度的串 /// </summary> /// <param name="sqlInput">输入字符串</param> /// <param name="maxLength">最大长度</param> /// <returns></returns> public static string SqlText(string sqlInput, int maxLength) { if(sqlInput != null && sqlInput != string.Empty) { sqlInput = sqlInput.Trim(); if(sqlInput.Length > maxLength)//按最大长度截取字符串 sqlInput = sqlInput.Substring(0, maxLength); } return sqlInput; } /**//// <summary> /// 字符串编码 /// </summary> /// <param name="inputData"></param> /// <returns></returns> public static string HtmlEncode(string inputData) { return HttpUtility.HtmlEncode(inputData); } /**//// <summary> /// 设置Label显示Encode的字符串 /// </summary> /// <param name="lbl"></param> /// <param name="txtInput"></param> public static void SetLabel(Label lbl, string txtInput) { lbl.Text = HtmlEncode(txtInput); } public static void SetLabel(Label lbl, object inputObj) { SetLabel(lbl, inputObj.ToString()); } //字符串清理 public static string InputText(string inputString, int maxLength) { StringBuilder retVal = new StringBuilder(); // 检查是否为空 if ((inputString != null) && (inputString != String.Empty)) { inputString = inputString.Trim(); //检查长度 if (inputString.Length > maxLength) inputString = inputString.Substring(0, maxLength); //替换危险字符 for (int i = 0; i < inputString.Length; i++) { switch (inputString[i]) { case '"': retVal.Append("""); break; case '<': retVal.Append("<"); break; case '>': retVal.Append(">"); break; default: retVal.Append(inputString[i]); break; } } retVal.Replace("'", " ");// 替换单引号 } return retVal.ToString(); } /**//// <summary> /// 转换成 HTML code /// </summary> /// <param name="str">string</param> /// <returns>string</returns> public static string Encode(string str) { str = str.Replace("&","&"); str = str.Replace("'","''"); str = str.Replace("\"","""); str = str.Replace(" "," "); str = str.Replace("<","<"); str = str.Replace(">",">"); str = str.Replace("\n","<br>"); return str; } /**//// <summary> ///解析html成普通文本 /// </summary> /// <param name="str">string</param> /// <returns>string</returns> public static string Decode(string str) { str = str.Replace("<br>","\n"); str = str.Replace(">",">"); str = str.Replace("<","<"); str = str.Replace(" "," "); str = str.Replace(""","\""); return str; } public static string SqlTextClear(string sqlText) { if (sqlText == null) { return null; } if (sqlText == "") { return ""; } sqlText = sqlText.Replace(",", "");//去除, sqlText = sqlText.Replace("<", "");//去除< sqlText = sqlText.Replace(">", "");//去除> sqlText = sqlText.Replace("--", "");//去除-- sqlText = sqlText.Replace("'", "");//去除' sqlText = sqlText.Replace("\"", "");//去除" sqlText = sqlText.Replace("=", "");//去除= sqlText = sqlText.Replace("%", "");//去除% sqlText = sqlText.Replace(" ", "");//去除空格 return sqlText; } #endregion //是否由特定字符组成#region 是否由特定字符组成 public static bool isContainSameChar(string strInput) { string charInput = string.Empty; if (!string.IsNullOrEmpty(strInput)) { charInput = strInput.Substring(0, 1); } return isContainSameChar(strInput, charInput, strInput.Length); } public static bool isContainSameChar(string strInput, string charInput, int lenInput) { if (string.IsNullOrEmpty(charInput)) { return false; } else { Regex RegNumber = new Regex(string.Format("^([{0}])+$", charInput)); //Regex RegNumber = new Regex(string.Format("^([{0}]{{1}})+$", charInput,lenInput)); Match m = RegNumber.Match(strInput); return m.Success; } } #endregion //检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查#region 检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查 /**//// <summary> /// 检查输入的参数是不是某些定义好的特殊字符：这个方法目前用于密码输入的安全检查 /// </summary> public static bool isContainSpecChar(string strInput) { string[] list = new string[] { "123456", "654321" }; bool result = new bool(); for (int i = 0; i < list.Length; i++) { if (strInput == list[i]) { result = true; break; } } return result; } #endregion }

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