系统常用操作

public class SysOperation
{
   public SysOperation() {}

   public static string OpenDialog(string msg)
   {
     return ("<script>alert('"+ msg +"')</script>");
   }

   public static bool StringNullChecked(string str)
   {
 if (str == null || str == "" || str.Length < 1)
        { return false; }
 return true;
   }

   public static void SetListSelected(DropDownList list,string value)
   {
 if(list.Items.Count < 0 )
        {
  list.SelectedIndex = -1;
                return;
   }
 for(int i=0; i < list.items.Count; i++)
 {
  if(list.Items[i].Value == value)
  {
   list.SelectedIndex = i;
   return;
  }
 }
 list.SelectedIndex = -1;
   }

   public static void SetListSelected(ListBox list,string value)
   {
 if(list.Items.Count <= 0)
        {
  list.SelectedIndex  = -1;
  return;
  }
 for(int i=0; i < list.Items.Count; i++)
 {
  if(list.Items[i].Value == value)
  {
  list.SelectedIndex = i;
  return; }
 }
 list.SelectedIndex = -1;
   }

   public static string FormatErrorUrl(string url)
   {
 if(url.IndexOf("?")>0)
 { return (url.Substring(0,url,IndexOf("?")))}
 return (url);
   }

   public static string FormatErrorPageUrl(string url,string msg)
   {
 return ("~/Portal/ErrorPage.aspx?ErrorMsg="+msg
         + "&ErrorUrl="+url.Replace("/n","").Replace("/t",""));
   }

   public static DataSet CacheCatalogData()
{
 ICatalog catalog = new Catalog();
 DataSet ds = (DataSet)SQLHelper.CacheData.GetCacheValue(SystemConst.Catalog_Cache_Value_Key);
if(ds==null)
{
  ds = new DataSet();
  catalog.GetCatalogDS(ref ds);
  SQLHelper.CacheData.CacheObjectValue(SystemConst.Catalog_Cache_Value_Key,(object)ds);
}
return ds;
}

public static string CreateFileNameByDateTime()
{
DateTime now = DateTime.Now;
string fileName =now.Year.ToString()
+now.Month.ToString()
+now.Day.ToString()
+now.Hour.ToString()
+now.Minute.ToString()
+now.Second.ToString()
+now.Millisecond.ToString();
return (fileName);
}

public static string FormatStringLength(string str,int length)
{
if(SysOperation.StringNullChecked(str) == false)
{
return string.Empty;
}
if(Encoding.UTF8.GetByteCount(str) > str.Length)
{
 length = length/2;
}
if(str.Length > length)
{
return str.Substring(0,length)+"...";
}
return str;
}

}