using System;
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using System.Collections.Specialized;
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using System.Data;
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using System.IO;
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Xml.Serialization;
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namespace Common
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{
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public abstract class DataHelper
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{
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private static object Md5Mutex = new object();
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public static void SerializeDataTableXmlFile(DataTable table, string filename)
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{
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XmlSerializer xmlSerializer = new XmlSerializer(typeof(DataTable));
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FileInfo fileInfo = new FileInfo(filename);
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if (!fileInfo.Directory.Exists)
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fileInfo.Directory.Create();
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using (StreamWriter streamWriter = new StreamWriter((Stream)fileInfo.Open(FileMode.OpenOrCreate)))
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{
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try
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{
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xmlSerializer.Serialize((TextWriter)streamWriter, (object)table);
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}
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catch (Exception ex)
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{
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LogHelper.Error(ex);
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}
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}
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}
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public static int MemoryCompare(byte[] b1, byte[] b2)
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{
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int num = 0;
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if (b1.Length != b2.Length)
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{
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num = b1.Length - b2.Length;
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}
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else
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{
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for (int index = 0; index < b1.Length; ++index)
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{
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if ((int)b1[index] != (int)b2[index])
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{
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num = (int)b1[index] - (int)b2[index];
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break;
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}
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}
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}
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return num;
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}
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public static string MD5Hex(string source)
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{
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lock (DataHelper.Md5Mutex)
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return BitConverter.ToString(MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(source))).Replace("-", "");
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}
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public static string MD5Hex(byte[] source, int offset, int count)
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{
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lock (DataHelper.Md5Mutex)
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return BitConverter.ToString(MD5.Create().ComputeHash(source, offset, count)).Replace("-", "");
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}
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public static byte[] MD5Bytes(string source)
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{
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lock (DataHelper.Md5Mutex)
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return MD5.Create().ComputeHash(Encoding.Default.GetBytes(source));
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}
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private static string FormatToPlainText(string text)
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{
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char[] chArray = text.ToCharArray();
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StringBuilder stringBuilder = new StringBuilder();
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foreach (char ch in chArray)
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{
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if ((int)ch >= 48 && (int)ch <= 57 || (int)ch >= 65 && (int)ch <= 90 || (int)ch >= 97 && (int)ch <= 122 || (int)ch >= 16513 && (int)ch <= 65278)
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stringBuilder.Append(ch);
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}
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return stringBuilder.ToString();
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}
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public static byte[] ComputerHashBytes(string source)
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{
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lock (DataHelper.Md5Mutex)
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return MD5.Create().ComputeHash(Encoding.Default.GetBytes(source));
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}
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public static NameValueCollection GetParams(string exp)
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{
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NameValueCollection nameValueCollection = new NameValueCollection();
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if (!string.IsNullOrEmpty(exp))
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{
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foreach (string input in exp.Split(";\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries))
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{
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Match match = Regex.Match(input, "(.*)=(.*)");
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if (match.Success)
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nameValueCollection[match.Groups[1].Value] = match.Groups[2].Value;
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}
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}
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return nameValueCollection;
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}
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public static string LeftString(string s, int length)
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{
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if (string.IsNullOrEmpty(s))
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return string.Empty;
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return s.Substring(0, Math.Min(length, s.Length));
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}
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public static string RemovePrefixString(string source, string prefix)
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{
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try
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{
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if (source.StartsWith(prefix))
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return source.Substring(prefix.Length);
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return source;
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}
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catch
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{
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return source;
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}
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}
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public static string AddPrefixString(string source, string prefix)
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{
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if (!source.StartsWith(prefix))
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return string.Format("{0}{1}", (object)prefix, (object)source);
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return source;
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}
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}
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}
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