一些常用公共方法

/// <summary>
/// 根据文件后缀名获取文件的mime类型
/// </summary>
/// <param name="ps_FileExtension">文件后缀名，如：.jpg,.gif</param>
/// <returns>返回该文件的mime类型,如 image/gif</returns>
public static string getMimeType(string ps_FileExtension)
{
string sResult = "";
switch(ps_FileExtension.ToLower().Trim())
{
case ".gif":
sResult = "image/gif";
break;
case ".jpg":
case ".jpeg":
sResult = "image/jpeg";
break;
case ".bmp":
sResult = "image/bmp";
break;
case ".gz":
sResult = "application/x-gzip";
break;
case ".htm":
sResult = "text/html";
break;
case ".html":
sResult = "text/html";
break;
case ".tar":
sResult = "application/x-tar";
break;
case ".zip":
sResult = "application/zip";
break;
case ".rar":
sResult = "image/rar";
break;
case ".doc":
sResult = "application/msword";
break;
case ".xls":
sResult = "application/vnd.ms-excel";
break;
case ".ppt":
sResult = "application/vnd.ms-powerpoint";
break;
default:
sResult = "application/octet-stream";
break;
}
return(sResult);
}

/// <summary>
/// 根据数据表的列名取的列的序号
/// </summary>
/// <param name="colName">列名</param>
/// <param name="myDataTable">数据表</param>
/// <returns>列号，没有找到返回-1</returns>
public static int getTableColIndexByName(string colName,DataTable myDataTable)
{
int iIndex = -1;
for(int i=0;i<myDataTable.Columns.Count;i++)
{
if(myDataTable.Columns[i].ColumnName == colName)
{
iIndex = i;
break;
}
}
return iIndex;
}
/// <summary>
/// 转换成全日期如2005-05-05
/// </summary>
/// <param name="ps_Date"></param>
/// <returns></returns>
public static string FromatFullDate(string ps_Date)
{
DateTime now = Convert.ToDateTime(ps_Date);
string strYear = now.Year.ToString ();
string strMonth = now.Month.ToString();
string strDay = now.Day.ToString();
if (strMonth.Length ==1)
{
strMonth="0"+strMonth;
}
if (strDay.Length ==1)
{
strDay="0"+strDay;
}
string strDate=strYear+"-"+strMonth+"-"+strDay;
return strDate;
}
/// <summary>
/// 转换成时间为小时分钟制，如 05：05
/// </summary>
/// <param name="ps_Time"></param>
/// <returns></returns>
public static string FromatFullTime(string ps_Time)
{
DateTime now = Convert.ToDateTime(ps_Time);
string strHour = now.Hour.ToString();
string strMinute = now.Minute.ToString();
if (strHour.Length ==1)
{
strHour="0"+strHour;
}
if (strMinute.Length ==1)
{
strMinute="0"+strMinute;
}
string strTime=strHour+":"+strMinute;
return strTime;
}
/// <summary>
/// 转换成全日期 时：分格式，如2005-05-05 15：20
/// </summary>
/// <param name="ps_Date">日期</param>
/// <param name="ps_Time">小时分钟</param>
/// <returns></returns>
public static string FromatFullDateTime(string ps_Date,string ps_Time)
{
string strDate=FromatFullDate(ps_Date);
string strTime=FromatFullTime(ps_Time);
return strDate+" "+strTime;
}

/// <summary>
/// 判断字符是否为数字
/// </summary>
/// <param name="itemValue">输入的值</param>
/// <returns>true or false</returns>
public static bool IsNumeric(string itemValue)
{
return (IsRegEx("^(-?[0-9]*[.]*[0-9]{0,3})$", itemValue));
//^(/+|-)?(0|[1-9]/d*)(/./d*[1-9])?$/
}
private static bool IsRegEx(string regExValue, string itemValue)
{
try
{
System.Text.RegularExpressions.Regex regex = new System.Text.RegularExpressions.Regex(regExValue);
if (regex.IsMatch(itemValue))
return true;
else
return false;
}
catch (Exception )
{
return false;
}
}
/// <summary>
/// 编码转换
/// </summary>
/// <param name="strIn"></param>
/// <param name="encoding"></param>
/// <returns></returns>
public static string StrConv(string strIn, string encoding)
{
return System.Web.HttpUtility.UrlEncode(strIn,System.Text.Encoding.GetEncoding(encoding));
}
/// <summary>
/// 从SQL语句中获取表名
/// </summary>
/// <param name="strSql">sql语句</param>
/// <returns></returns>
public static string GetTableNameFromSQL(string strSql)
{
if (strSql=="") return "";
string mySql;
string strTmp;
int i;
mySql=strSql.ToUpper();
i=mySql.IndexOf(" FROM ");
strTmp=mySql.Substring(i+6);
i=strTmp.IndexOf(" WHERE ");
if (i>=0)
strTmp=strTmp.Substring(0,i);
else
{
i=strTmp.IndexOf(" GROUP ");
if (i>=0) strTmp=strTmp.Substring(0,i);
i=strTmp.IndexOf(" ORDER ");
if (i>=0) strTmp=strTmp.Substring(0,i);
}
strTmp=strTmp.Trim();
return strTmp;
}
/// <summary>
/// 判断值是否在列表框中，如果在的话，就选择，否则不处理
/// </summary>
/// <param name="list">列表控件</param>
/// <param name="text">值</param>
public static void SelectListControl(ListControl list, string text)
{
if(text == null )
return;
ListItem item = list.Items.FindByText(text);
if (item != null)
{
list.ClearSelection();
item.Selected = true;
}
else
{
ListItem it = list.Items.FindByValue(text);
if(it != null)
{
list.ClearSelection();
it.Selected = true;
}
}
}
/// <summary>
/// 取得字串的字节长度
/// </summary>
/// <param name="p_str"></param>
/// <returns></returns>
static public int GetStringByteLen(string p_str)
{
return(Encoding.GetEncoding("gb2312").GetByteCount(p_str));
}
/// <summary>
/// 取得字串的字节长度
/// </summary>
/// <param name="p_source"></param>
/// <param name="p_length"></param>
/// <returns></returns>
static public string CutString(string p_source ,int p_length)
{
return(CutString( p_source , p_length, ".."));
}

/// <summary>
/// 取得被截断的字串，由参数指定长度，如果超出长度就截断，并在尾部添加字串
/// </summary>
/// <param name="p_source">源字串</param>
/// <param name="p_length">限定的长度</param>
/// <param name="p_tail">尾部的字串</param>
/// <returns></returns>
static public string CutString(string p_source ,int p_length, string p_tail)
{
if(GetStringByteLen(p_source) <= p_length)
return(p_source);
string cutedStr;
int cutedByLen;
int resultLen = p_length;
int iTailLen = GetStringByteLen(p_tail);

while(true)
{
cutedStr = p_source.Substring(0, Convert.ToInt32(resultLen/2));
cutedByLen = GetStringByteLen(cutedStr);
if(cutedByLen + iTailLen > p_length)
//throw new Exception("Error cutedByLen=" +cutedByLen.ToString() + "|cutedByLen=" + cutedByLen + "|iTailLen=" + iTailLen);
CutString(cutedStr,p_length,"...");

if(cutedByLen + iTailLen == p_length || cutedByLen + iTailLen == p_length-1)
{
return(cutedStr + p_tail);
}
else
{
resultLen += (p_length - cutedByLen -iTailLen);
}
}
}
/// <summary>
/// 对输出在网页上的文本串进行格式化，如果该文本串为空则返回 空格
/// 否则对该文本串执行HtmlEncode格式化，及替换换行符为 换行 操作
/// </summary>
/// <param name="inValue">要转换的值</param>
/// <returns>返回文本串</returns>
public static string DispalyEncode(string inValue)
{
string outValue;
if(inValue == null)
return(" ");
if(inValue == "")
return(" ");
outValue = HttpUtility.HtmlEncode(inValue);
//outValue = outValue.Replace("/r/n", "<br>");
return(outValue);
}
/// <summary>
/// 对输出在网页上的对象串进行格式化，如果为空则返回 一个空格
/// </summary>
/// <param name="p_value">要转换的对象值</param>
/// <returns>返回文本串</returns>
public static string DisplayEncode(object p_value)
{
if(p_value is DBNull)
return(" ");
else
return( DisplayEncode((string)p_value) );
}
/// <summary>
/// 根据原来的排序名、现有的排序名、原来的排序方式（asc或desc）判断现有的排序方式
/// </summary>
/// <param name="oldName">原有排序名</param>
/// <param name="newName">现有排序名</param>
/// <param name="oldValue">原排序方式</param>
/// <returns>返回排序方式如desc,asc</returns>
public static string GetSortValue(string oldName,string newName,string oldValue)
{
if(oldName == newName)
{
if(oldValue == "asc")
return("desc");
else
return("asc");
}
else
{
return("asc");
}
}