c#类型转换（续）

/// <summary> /// 将对象转换为Int32类型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static int ObjectToInt(object expression) { return ObjectToInt(expression, 0); } /// <summary> /// 将对象转换为Int32类型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static int ObjectToInt(object expression, int defValue) { if (expression != null) return StrToInt(expression.ToString(), defValue); return defValue; } /// <summary> /// 将对象转换为Int32类型,转换失败返回0 /// </summary> /// <param name="str">要转换的字符串</param> /// <returns>转换后的int类型结果</returns> public static int StrToInt(string str) { return StrToInt(str, 0); } /// <summary> /// 将对象转换为Int32类型 /// </summary> /// <param name="str">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static int StrToInt(string str, int defValue) { if (string.IsNullOrEmpty(str) || str.Trim().Length >= 11 || !Regex.IsMatch(str.Trim(), @"^([-]|[0-9])[0-9]*(/./w*)?$")) return defValue; int rv; if (Int32.TryParse(str, out rv)) return rv; return Convert.ToInt32(StrToFloat(str, defValue)); } /// <summary> /// string型转换为float型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static float StrToFloat(object strValue, float defValue) { if ((strValue == null)) return defValue; return StrToFloat(strValue.ToString(), defValue); } /// <summary> /// string型转换为float型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static float ObjectToFloat(object strValue, float defValue) { if ((strValue == null)) return defValue; return StrToFloat(strValue.ToString(), defValue); } /// <summary> /// string型转换为float型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static float ObjectToFloat(object strValue) { return ObjectToFloat(strValue.ToString(), 0); } /// <summary> /// string型转换为float型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <returns>转换后的int类型结果</returns> public static float StrToFloat(string strValue) { if ((strValue == null)) return 0; return StrToFloat(strValue.ToString(), 0); } /// <summary> /// string型转换为float型 /// </summary> /// <param name="strValue">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static float StrToFloat(string strValue, float defValue) { if ((strValue == null) || (strValue.Length > 10)) return defValue; float intValue = defValue; if (strValue != null) { bool IsFloat = Regex.IsMatch(strValue, @"^([-]|[0-9])[0-9]*(/./w*)?$"); if (IsFloat) float.TryParse(strValue, out intValue); } return intValue; } /// <summary> /// 将对象转换为日期时间类型 /// </summary> /// <param name="str">要转换的字符串</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static DateTime StrToDateTime(string str, DateTime defValue) { if (!string.IsNullOrEmpty(str)) { DateTime dateTime; if (DateTime.TryParse(str, out dateTime)) return dateTime; } return defValue; } /// <summary> /// 将对象转换为日期时间类型 /// </summary> /// <param name="str">要转换的字符串</param> /// <returns>转换后的int类型结果</returns> public static DateTime StrToDateTime(string str) { return StrToDateTime(str, DateTime.Now); } /// <summary> /// 将对象转换为日期时间类型 /// </summary> /// <param name="obj">要转换的对象</param> /// <returns>转换后的int类型结果</returns> public static DateTime ObjectToDateTime(object obj) { return StrToDateTime(obj.ToString()); } /// <summary> /// 将对象转换为日期时间类型 /// </summary> /// <param name="obj">要转换的对象</param> /// <param name="defValue">缺省值</param> /// <returns>转换后的int类型结果</returns> public static DateTime ObjectToDateTime(object obj, DateTime defValue) { return StrToDateTime(obj.ToString(), defValue); } /// <summary> /// 替换回车换行符为html换行符 /// </summary> public static string StrFormat(string str) { string str2; if (str == null) { str2 = ""; } else { str = str.Replace("/r/n", "<br />"); str = str.Replace("/n", "<br />"); str2 = str; } return str2; } /// <summary> /// 转换为简体中文 /// </summary> public static string ToSChinese(string str) { return Strings.StrConv(str, VbStrConv.SimplifiedChinese, 0); } /// <summary> /// 转换为繁体中文 /// </summary> public static string ToTChinese(string str) { return Strings.StrConv(str, VbStrConv.TraditionalChinese, 0); } /// <summary> /// 清除字符串数组中的重复项 /// </summary> /// <param name="strArray">字符串数组</param> /// <param name="maxElementLength">字符串数组中单个元素的最大长度</param> /// <returns></returns> public static string[] DistinctStringArray(string[] strArray, int maxElementLength) { Hashtable h = new Hashtable(); foreach (string s in strArray) { string k = s; if (maxElementLength > 0 && k.Length > maxElementLength) { k = k.Substring(0, maxElementLength); } h[k.Trim()] = s; } string[] result = new string[h.Count]; h.Keys.CopyTo(result, 0); return result; } /// <summary> /// 清除字符串数组中的重复项 /// </summary> /// <param name="strArray">字符串数组</param> /// <returns></returns> public static string[] DistinctStringArray(string[] strArray) { return DistinctStringArray(strArray, 0); }