95 lines
2.9 KiB
C#
95 lines
2.9 KiB
C#
//
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// Class: Extensions
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// Current CLR: 4.0.30319.34209
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// System: Microsoft Visual Studio 10.0
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// Author: dani
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// Created: 5/13/2015 7:37:03 PM
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//
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// Copyright (c) 2015 Informatikbüro Daniel Schick. All rights reserved.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Text.RegularExpressions;
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using log4net;
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namespace bsmd.database
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{
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/// <summary>
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/// sensible helpers
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/// </summary>
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public static class Extensions
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{
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private static ILog _log = LogManager.GetLogger(typeof(Extensions));
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public static bool IsNullOrEmpty(this String str)
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{
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if (str == null) return true;
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if (str.Trim().Length == 0) return true;
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if (str.Equals("00000000-0000-0000-0000-000000000000")) return true; // for null guids
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return false;
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}
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public static bool IsNullOrEmpty<T>(this List<T> items)
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{
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return (items == null) || (items.Count == 0);
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}
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public static bool IsNullOrEmpty<T>(this Dictionary<T, T> items)
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{
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return (items == null) || (items.Count == 0);
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}
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public static bool IsNumber(this String str)
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{
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string pattern = @"^[1-9]\d*(\.\d+)?$";
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if (str == null) return false;
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if (str.Trim().Length == 0) return false;
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return new Regex(pattern).IsMatch(str);
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}
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public static bool IsBoolean(this String str)
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{
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if (str == null) return false;
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if (str.Trim().Length == 0) return false;
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if (str.Trim().Equals("true", StringComparison.InvariantCultureIgnoreCase)) return true;
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if (str.Trim().Equals("false", StringComparison.InvariantCultureIgnoreCase)) return true;
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return false;
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}
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public static bool Contains(this string source, string toCheck, StringComparison comp)
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{
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return source.IndexOf(toCheck, comp) >= 0;
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}
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public static DateTime? TryParseDateTime(string text)
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{
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DateTime date;
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if(DateTime.TryParse(text, DateTimeFormatInfo.InvariantInfo,DateTimeStyles.AssumeUniversal, out date))
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{
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return date;
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}
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else
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{
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_log.WarnFormat("{0} cannot be parsed as datetime", text);
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return null;
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}
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}
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public static double? TryParseDouble(string text)
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{
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double d;
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if (Double.TryParse(text, NumberStyles.Any, NumberFormatInfo.InvariantInfo, out d))
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{
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return d;
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}
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else
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{
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_log.WarnFormat("{0} cannot be parsed as double", text);
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return null;
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}
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}
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}
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}
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