C#常用方法类库：数据类型

这个C#类定义了一些开发过程中经常要使用的到的函数和方法，包括数据转换，数据类型判断，格式化日期、计算两个日期之间的差值等等，你还可以自己扩充这个类，把自己常用的函数或者方法放进去。

using System;
using System.IO;
using System.Data;
using System.Collections;
using System.Text.RegularExpressions;
using System.Web.UI;

namespace DotNet.Utilities
{
/// <summary>
/// Utility 的摘要说明。
/// </summary>
public class Utility:Page
{

#region 数据转换
/// <summary>
/// 返回对象obj的String值,obj为null时返回空值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>字符串。</returns>
public static string ToObjectString(object obj)
{
return null == obj ? String.Empty : obj.ToString();
}

/// <summary>
/// 将对象转换为数值(Int32)类型,转换失败返回-1。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Int32数值。</returns>
public static int ToInt(object obj)
{
try
{
return int.Parse(ToObjectString(obj));
}
catch
{ return -1; }
}

/// <summary>
/// 将对象转换为数值(Int32)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Int32数值。</returns>
public static int ToInt(object obj,int returnValue)
{
try
{
return int.Parse(ToObjectString(obj));
}
catch
{ return returnValue; }
}
/// <summary>
/// 将对象转换为数值(Long)类型,转换失败返回-1。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Long数值。</returns>
public static long ToLong(object obj)
{
try
{
return long.Parse(ToObjectString(obj));
}
catch
{ return -1L; }
}
/// <summary>
/// 将对象转换为数值(Long)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Long数值。</returns>
public static long ToLong(object obj,long returnValue)
{
try
{
return long.Parse(ToObjectString(obj));
}
catch
{ return returnValue; }
}
/// <summary>
/// 将对象转换为数值(Decimal)类型,转换失败返回-1。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Decimal数值。</returns>
public static decimal ToDecimal(object obj)
{
try
{
return decimal.Parse(ToObjectString(obj));
}
catch
{ return -1M; }
}

/// <summary>
/// 将对象转换为数值(Decimal)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Decimal数值。</returns>
public static decimal ToDecimal(object obj,decimal returnValue)
{
try
{
return decimal.Parse(ToObjectString(obj));
}
catch
{ return returnValue; }
}
/// <summary>
/// 将对象转换为数值(Double)类型,转换失败返回-1。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Double数值。</returns>
public static double ToDouble(object obj)
{
try
{
return double.Parse(ToObjectString(obj));
}
catch
{ return -1; }
}

/// <summary>
/// 将对象转换为数值(Double)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Double数值。</returns>
public static double ToDouble(object obj,double returnValue)
{
try
{
return double.Parse(ToObjectString(obj));
}
catch
{ return returnValue; }
}
/// <summary>
/// 将对象转换为数值(Float)类型,转换失败返回-1。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Float数值。</returns>
public static float ToFloat(object obj)
{
try
{
return float.Parse(ToObjectString(obj));
}
catch
{ return -1; }
}

/// <summary>
/// 将对象转换为数值(Float)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Float数值。</returns>
public static float ToFloat(object obj,float returnValue)
{
try
{
return float.Parse(ToObjectString(obj));
}
catch
{ return returnValue; }
}
/// <summary>
/// 将对象转换为数值(DateTime)类型,转换失败返回Now。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>DateTime值。</returns>
public static DateTime ToDateTime(object obj)
{
try
{
DateTime dt = DateTime.Parse(ToObjectString(obj));
if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
return dt;
return DateTime.Now;
}
catch
{ return DateTime.Now; }
}

/// <summary>
/// 将对象转换为数值(DateTime)类型。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>DateTime值。</returns>
public static DateTime ToDateTime(object obj,DateTime returnValue)
{
try
{
DateTime dt = DateTime.Parse(ToObjectString(obj));
if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
return dt;
return returnValue;
}
catch
{ return returnValue; }
}
/// <summary>
/// 从Boolean转换成byte,转换失败返回0。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Byte值。</returns>
public static byte ToByteByBool( object obj )
{
string text = ToObjectString(obj).Trim();
if( text == string.Empty)
return 0;
else
{
try
{
return (byte)(text.ToLower()=="true"?1:0);
}
catch
{
return 0;
}
}
}

/// <summary>
/// 从Boolean转换成byte。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Byte值。</returns>
public static byte ToByteByBool( object obj, byte returnValue )
{
string text = ToObjectString(obj).Trim();
if( text == string.Empty)
return returnValue;
else
{
try
{
return (byte)(text.ToLower()=="true"?1:0);
}
catch
{
return returnValue;
}
}
}
/// <summary>
/// 从byte转换成Boolean,转换失败返回false。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Boolean值。</returns>
public static bool ToBoolByByte( object obj )
{
try
{
string s = ToObjectString(obj).ToLower();
return s == "1" || s== "true"?true:false;
}
catch
{
return false;
}
}
/// <summary>
/// 从byte转换成Boolean。
/// </summary>
/// <param name="obj">对象。</param>
/// <param name="returnValue">转换失败返回该值。</param>
/// <returns>Boolean值。</returns>
public static bool ToBoolByByte( object obj, bool returnValue )
{
try
{
string s = ToObjectString(obj).ToLower();
return s == "1" || s== "true"?true:false;
}
catch
{
return returnValue;
}
}
#endregion

#region 数据判断
/// <summary>
/// 判断文本obj是否为空值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Boolean值。</returns>
public static bool IsEmpty(string obj)
{
return ToObjectString(obj).Trim() == String.Empty ? true : false;
}

/// <summary>
/// 判断对象是否为正确的日期值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Boolean。</returns>
public static bool IsDateTime(object obj)
{
try
{
DateTime dt = DateTime.Parse(ToObjectString(obj));
if( dt > DateTime.MinValue && DateTime.MaxValue > dt)
return true;
return false;
}
catch
{ return false; }
}

/// <summary>
/// 判断对象是否为正确的Int32值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Int32值。</returns>
public static bool IsInt(object obj)
{
try
{
int.Parse(ToObjectString(obj));
return true;
}
catch
{ return false; }
}

/// <summary>
/// 判断对象是否为正确的Long值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Long值。</returns>
public static bool IsLong(object obj)
{
try
{
long.Parse(ToObjectString(obj));
return true;
}
catch
{ return false; }
}

/// <summary>
/// 判断对象是否为正确的Float值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Float值。</returns>
public static bool IsFloat(object obj)
{
try
{
float.Parse(ToObjectString(obj));
return true;
}
catch
{ return false; }
}

/// <summary>
/// 判断对象是否为正确的Double值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Double值。</returns>
public static bool IsDouble(object obj)
{
try
{
double.Parse(ToObjectString(obj));
return true;
}
catch
{ return false; }
}

/// <summary>
/// 判断对象是否为正确的Decimal值。
/// </summary>
/// <param name="obj">对象。</param>
/// <returns>Decimal值。</returns>
public static bool IsDecimal(object obj)
{
try
{
decimal.Parse(ToObjectString(obj));
return true;
}
catch
{ return false; }
}
#endregion

#region 数据操作
/// <summary>
/// 去除字符串的所有空格。
/// </summary>
/// <param name="text">字符串</param>
/// <returns>字符串</returns>
public static string StringTrimAll( string text )
{
string _text = ToObjectString(text);
string returnText = String.Empty;
char[] chars = _text.ToCharArray();
for( int i=0;i<chars.Length;i++)
{
if( chars[i].ToString() != string.Empty)
returnText += chars[i].ToString();
}
return returnText;
}

/// <summary>
/// 去除数值字符串的所有空格。
/// </summary>
/// <param name="numricString">数值字符串</param>
/// <returns>String</returns>
public static string NumricTrimAll( string numricString )
{
string text = ToObjectString(numricString).Trim();
string returnText = String.Empty;
char[] chars = text.ToCharArray();
for( int i=0;i<chars.Length;i++)
{
if( chars[i].ToString() == "+" || chars[i].ToString() == "-" || IsDouble( chars[i].ToString()) )
returnText += chars[i].ToString();
}
return returnText;
}

/// <summary>
/// 在数组中查找匹配对象类型
/// </summary>
/// <param name="array">数组</param>
/// <param name="obj">对象</param>
/// <returns>Boolean</returns>
public static bool ArrayFind(Array array,object obj)
{
bool b = false;
foreach(object obj1 in array)
{
if(obj.Equals(obj1))
{
b = true;
break;
}
}
return b;
}

/// <summary>
/// 在数组中查找匹配字符串
/// </summary>
/// <param name="array">数组</param>
/// <param name="obj">对象</param>
/// <param name="unUpLower">是否忽略大小写</param>
/// <returns>Boolean</returns>
public static bool ArrayFind(Array array,string obj,bool unUpLower)
{
bool b = false;
foreach(string obj1 in array)
{
if(!unUpLower)
{
if(obj.Trim().Equals(obj1.ToString().Trim()))
{
b = true;
break;
}
}
else
{
if(obj.Trim().ToUpper().Equals(obj1.ToString().Trim().ToUpper()))
{
b = true;
break;
}
}
}
return b;
}
/// <summary>
/// 替换字符串中的单引号。
/// </summary>
/// <param name="inputString">字符串</param>
/// <returns>String</returns>
public static string ReplaceInvertedComma( string inputString )
{
return inputString.Replace("'","''");
}

/// <summary>
/// 判断两个字节数组是否具有相同值.
/// </summary>
/// <param name="bytea">字节1</param>
/// <param name="byteb">字节2</param>
/// <returns>Boolean</returns>
public static bool CompareByteArray(byte[] bytea,byte[] byteb)
{
if(null == bytea || null == byteb)
{
return false;
}
else
{
int aLength = bytea.Length;
int bLength = byteb.Length;
if(aLength != bLength)
return false;
else
{
bool compare = true;
for(int index = 0; index < aLength; index++)
{
if(bytea[index].CompareTo(byteb[index]) != 0)
{
compare = false;
break;
}
}
return compare;
}
}
}

/// <summary>
/// 日期智能生成。
/// </summary>
/// <param name="inputText">字符串</param>
/// <returns>DateTime</returns>
public static string BuildDate( string inputText )
{
try
{
return DateTime.Parse( inputText ).ToShortDateString();
}
catch
{
string text = NumricTrimAll( inputText );
string year = DateTime.Now.Year.ToString();
string month = DateTime.Now.Month.ToString();
string day = DateTime.Now.Day.ToString();
int length = text.Length;
if( length == 0 )
return String.Empty;
else
{
if( length<=2 )
day = text;
else if( length<=4 )
{
month = text.Substring(0,2);
day = text.Substring(2,length-2);
}
else if( length<=6 )
{
year = text.Substring(0,4);
month = text.Substring(4,length-4);
}
else if( length>6)
{
year = text.Substring(0,4);
month = text.Substring(4,2);
day = text.Substring(6,length-6);
}
try
{
return DateTime.Parse( year+"-"+month+"-"+day ).ToShortDateString();
}
catch
{
return String.Empty;
}
}
}
}

/// <summary>
/// 检查文件是否真实存在。
/// </summary>
/// <param name="path">文件全名（包括路径）。</param>
/// <returns>Boolean</returns>
public static bool IsFileExists(string path)
{
try
{
return File.Exists(path);
}
catch
{ return false; }
}

/// <summary>
/// 检查目录是否真实存在。
/// </summary>
/// <param name="path">目录路径.</param>
/// <returns>Boolean</returns>
public static bool IsDirectoryExists(string path)
{
try
{
return Directory.Exists(Path.GetDirectoryName(path));
}
catch
{ return false; }
}

/// <summary>
/// 查找文件中是否存在匹配行。
/// </summary>
/// <param name="fi">目标文件.</param>
/// <param name="lineText">要查找的行文本.</param>
/// <param name="lowerUpper">是否区分大小写.</param>
/// <returns>Boolean</returns>
public static bool FindLineTextFromFile(FileInfo fi,string lineText,bool lowerUpper)
{
bool b = false;
try
{
if(fi.Exists)
{
StreamReader sr=new StreamReader(fi.FullName);
string g = "";
do
{
g=sr.ReadLine();
if(lowerUpper)
{
if(ToObjectString(g).Trim() == ToObjectString(lineText).Trim())
{
b = true;
break;
}
}
else
{
if(ToObjectString(g).Trim().ToLower() == ToObjectString(lineText).Trim().ToLower())
{
b = true;
break;
}
}
}
while(sr.Peek()!=-1);
sr.Close();
}
}
catch
{ b =false; }
return b;
}

/// <summary>
/// 判断父子级关系是否正确。
/// </summary>
/// <param name="table">数据表。</param>
/// <param name="columnName">子键列名。</param>
/// <param name="parentColumnName">父键列名。</param>
/// <param name="inputString">子键值。</param>
/// <param name="compareString">父键值。</param>
/// <returns></returns>
public static bool IsRightParent(DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
{
ArrayList array = new ArrayList();
SearchChild(array,table,columnName,parentColumnName,inputString,compareString);
return array.Count == 0;
}

// 内部方法
private static void SearchChild(ArrayList array,DataTable table,string columnName,string parentColumnName,string inputString,string compareString)
{
DataView view = new DataView(table);
view.RowFilter = parentColumnName+"='"+ReplaceInvertedComma(inputString.Trim())+"'";//找出所有的子类。
//查找表中的数据的ID是否与compareString相等，相等返回 false;不相等继续迭代。
for(int index = 0 ;index < view.Count;index ++)
{
if(Utility.ToObjectString(view[index][columnName]).ToLower() == compareString.Trim().ToLower())
{
array.Add("1");
break;
}
else
{
SearchChild(array,table,columnName,parentColumnName,Utility.ToObjectString(view[index][columnName]),compareString);
}
}
}

#endregion

#region 日期

/// <summary>
/// 格式化日期类型，返回字符串
/// </summary>
/// <param name="dtime">日期</param>
/// <param name="s">日期年月日间隔符号</param>
/// <returns></returns>
public static String Fomatdate(DateTime dtime,String s)
{
String datestr="";
datestr=dtime.Year.ToString() + s + dtime.Month.ToString().PadLeft(2,'0')+ s +dtime.Day.ToString().PadLeft(2,'0');
return datestr;
}

/// <summary>
/// 返回日期差
/// </summary>
/// <param name="sdmin">开始日期</param>
/// <param name="sdmax">结束日期</param>
/// <returns>日期差：负数为失败</returns>
public static int Datediff(DateTime sdmin,DateTime sdmax)
{
try
{
double i=0;
while(sdmin.AddDays(i)<sdmax)
{
i++;
}
return Utility.ToInt(i);
}
catch
{
return -1;
}
}

/// <summary>
/// 返回日期差
/// </summary>
/// <param name="sdmin">开始日期</param>
/// <param name="sdmax">结束日期</param>
/// <returns>日期差：负数为失败</returns>
public static int Datediff(String sdmin,String sdmax)
{
try
{
DateTime dmin;
DateTime dmax;
dmin=DateTime.Parse(sdmin);
dmax=DateTime.Parse(sdmax);
double i=0;
while(dmin.AddDays(i)<dmax)
{
i++;
}
return Utility.ToInt(i);
}
catch
{
return -1;
}
}

#endregion

#region 转换用户输入

/// <summary>
/// 将用户输入的字符串转换为可换行、替换Html编码、无危害数据库特殊字符、去掉首尾空白、的安全方便代码。
/// </summary>
/// <param name="inputString">用户输入字符串</param>
public static string ConvertStr(string inputString)
{
string retVal=inputString;
//retVal=retVal.Replace("&","&");
retVal=retVal.Replace("\"",""");
retVal=retVal.Replace("<","<");
retVal=retVal.Replace(">",">");
retVal=retVal.Replace(" "," ");
retVal=retVal.Replace(" ","  ");
retVal=retVal.Replace("\t","  ");
retVal=retVal.Replace("\r", "<br>");
return retVal;
}

public static string InputText(string inputString)
{
string retVal=inputString;
retVal= ConvertStr(retVal);
retVal=retVal.Replace("retVal=retVal.Replace("" target=_blank>", "");
retVal=retVal.Replace("", "");
return retVal;
}

/// <summary>
/// 将html代码显示在网页上
/// </summary>
/// <param name="inputString"></param>
/// <returns></returns>
public static string OutputText(string inputString)
{
string retVal=System.Web.HttpUtility.HtmlDecode(inputString);
retVal=retVal.Replace("<br>","");
retVal=retVal.Replace("&","&;");
retVal=retVal.Replace(""","\"");
retVal=retVal.Replace("<","<");
retVal=retVal.Replace(">",">");
retVal=retVal.Replace(" "," ");
retVal=retVal.Replace("  "," ");
return retVal;
}

public static string ToUrl(string inputString)
{
string retVal=inputString;
retVal= ConvertStr(retVal);
return Regex.Replace(retVal,@"\(?<x>[^\]]*)\",@"<a href=""$1"" target=""_blank"">$1</a>",RegexOptions.IgnoreCase);
}

public static string GetSafeCode(string str)
{
str=str.Replace("'","");
str=str.Replace(char.Parse("34"),' ');
str=str.Replace(";","");
return str;
}

#endregion

//#region 弹出框

///// <summary>
///// 服务器端弹出alert对话框
///// </summary>
///// <param name="str_Message">提示信息,例子："请输入您姓名!"</param>
///// <param name="page">Page类</param>
//public static void Alert(string str_Message,Page page)
//{
// page.RegisterStartupScript("","<script>alert('"+str_Message+"');</script>");
//}
///// <summary>
///// 服务器端弹出alert对话框
///// </summary>
///// <param name="str_Ctl_Name">获得焦点控件Id值,比如：txt_Name</param>
///// <param name="str_Message">提示信息,例子："请输入您姓名!"</param>
///// <param name="page">Page类</param>
//public static void Alert(string str_Ctl_Name,string str_Message,Page page)
//{
// page.RegisterStartupScript("","<script>alert('"+str_Message+"');document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>");
//}
///// <summary>
///// 服务器端弹出confirm对话框,该函数有个弊端,必须放到响应事件的最后,目前没有妥善解决方案
///// </summary>
///// <param name="str_Message">提示信息,例子："您是否确认删除!"</param>
///// <param name="btn">隐藏Botton按钮Id值,比如：btn_Flow</param>
///// <param name="page">Page类</param>
//public static void Confirm(string str_Message,string btn,Page page)
//{
// page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn+".click();}</script>");
//}
///// <summary>
///// 服务器端弹出confirm对话框,询问用户准备转向相应操作，包括“确定”和“取消”时的操作
///// </summary>
///// <param name="str_Message">提示信息，比如："成功增加数据,单击\"确定\"按钮填写流程,单击\"取消\"修改数据"</param>
///// <param name="btn_Redirect_Flow">"确定"按钮id值</param>
///// <param name="btn_Redirect_Self">"取消"按钮id值</param>
///// <param name="page">Page类</param>
//public static void Confirm(string str_Message,string btn_Redirect_Flow,string btn_Redirect_Self,Page page)
//{
// page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn_Redirect_Flow+".click();}else{document.forms(0)."+btn_Redirect_Self+".click();}</script>");
//}

//#endregion

/// <summary>
/// 设置绑定到DataGrid的DataTable的记录行数，如不够则添加空行
/// </summary>
/// <param name="myDataTable">数据表</param>
/// <param name="intPageCount">DataGrid分页时每页行数</param>
public static void SetTableRows(DataTable myDataTable,int intPageCount)
{
try
{
int intTemp=myDataTable.Rows.Count%intPageCount;
if ((myDataTable.Rows.Count==0) || (intTemp!=0))
{
for(int i=0;i<(intPageCount-intTemp);i++)
{
DataRow myDataRow=myDataTable.NewRow();
myDataTable.Rows.Add(myDataRow);
}
}
}
catch
{
throw;
}
}

public static string GetGuid(string guid)
{
return guid.Replace("-", "");
}

public static string ReadConfig(string filePath)
{
return System.Configuration.ConfigurationManager.AppSettings[filePath];
}

#region 字符串长度区分中英文截取
/// <summary>
/// 截取文本，区分中英文字符，中文算两个长度，英文算一个长度
/// </summary>
/// <param name="str">待截取的字符串</param>
/// <param name="length">需计算长度的字符串</param>
/// <returns>string</returns>
public static string GetSubString(string str, int length)
{
string temp = str;
int j = 0;
int k = 0;
for (int i = 0; i < temp.Length; i++)
{
if (Regex.IsMatch(temp.Substring(i, 1), @"[\u4e00-\u9fa5]+"))
{
j += 2;
}
else
{
j += 1;
}
if (j <= length)
{
k += 1;
}
if (j > length)
{
return temp.Substring(0, k) + "...";
}
}
return temp;
}
#endregion
}
}

//该代码片段来自于: http://www.sharejs.com/codes/csharp/8604