/// <summary>
/// Base64解密
/// </summary>
/// <param name="text">要解密的字符串</param>
public static string DecodeBase64(string text)
{
string result = string.Empty;
try
{
//如果字符串为空，则返回
if (ValidationHelper.IsNullOrEmpty <string>(text))
{
result = string.Empty;
}
//将空格替换为加号
text = text.Replace(" ", "+");
if ((text.Length % 4) != 0)
{
result = "包含不正确的BASE64编码";
}
if (!Regex.IsMatch(text, "^[A-Z0-9/+=]*$", RegexOptions.IgnoreCase))
{
result = "包含不正确的BASE64编码";
}
const string base64Code = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
int page = text.Length / 4;
var outMessage = new ArrayList(page * 3);
char[] message = text.ToCharArray();
for (int i = 0; i < page; i++)
{
var instr = new byte[4];
instr[0] = (byte)base64Code.IndexOf(message[i * 4]);
instr[1] = (byte)base64Code.IndexOf(message[i * 4 + 1]);
instr[2] = (byte)base64Code.IndexOf(message[i * 4 + 2]);
instr[3] = (byte)base64Code.IndexOf(message[i * 4 + 3]);
var outstr = new byte[3];
outstr[0] = (byte)((instr[0] << 2) ^ ((instr[1] & 0x30) >> 4));
if (instr[2] != 64)
{
outstr[1] = (byte)((instr[1] << 4) ^ ((instr[2] & 0x3c) >> 2));
}
else
{
outstr[2] = 0;
}
if (instr[3] != 64)
{
outstr[2] = (byte)((instr[2] << 6) ^ instr[3]);
}
else
{
outstr[2] = 0;
}
outMessage.Add(outstr[0]);
if (outstr[1] != 0)
{
outMessage.Add(outstr[1]);
}
if (outstr[2] != 0)
{
outMessage.Add(outstr[2]);
}
}
var outbyte = (byte[])outMessage.ToArray(Type.GetType("System.Byte"));
result = Encoding.Default.GetString(outbyte);
}
catch (Exception ex)
{
LogHelper.Error(ex);
}
return(result);
}
/// <summary>
/// 分页查询
/// </summary>
/// <param name="pageIndex">当前查询页</param>
/// <param name="pagesize">每页记录集数量</param>
/// <param name="fdname">用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段</param>
/// <param name="filedName">以逗号分隔的要显示的字段列表,如果不指定,则显示所有字段</param>
/// <param name="TableName">查询表名</param>
/// <param name="WhereStr">条件语句(可为空)</param>
/// <param name="OrderByStr">以逗号分隔的排序字段列表,可以指定在字段后面指定DESC/ASC用于指定排序顺序(可为空)</param>
/// <param name="pageCount">输出总页数</param>
/// <param name="recordcount">记录集总数</param>
/// <returns></returns>
public static DataTable pageSearch(int pageIndex, int pagesize, string fdname, string filedName, string TableName, string WhereStr, string OrderByStr, out int pageCount, out int recordcount)
{
DataTable dt = null;
pageCount = 0;
recordcount = 0;
try
{
DataSet dbs = new DataSet();
using (SqlConnection SqlConn = new SqlConnection(conStr))
{
if (SqlConn.State != ConnectionState.Open)
{
SqlConn.Open();
}
if (pageIndex <= 0)
{
pageIndex = 1;
}
using (SqlCommand command = new SqlCommand("proc_ShowPages", SqlConn))
{
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add(new SqlParameter("@PageSize", SqlDbType.Int));
command.Parameters.Add(new SqlParameter("@PageIndex", SqlDbType.Int));
command.Parameters.Add(new SqlParameter("@FieldKey", SqlDbType.VarChar, 8000));
command.Parameters.Add(new SqlParameter("@FieldShow", SqlDbType.VarChar, 8000));
command.Parameters.Add(new SqlParameter("@TableName", SqlDbType.VarChar, 8000));
if (!string.IsNullOrEmpty(WhereStr))
{
command.Parameters.Add(new SqlParameter("@Where", SqlDbType.VarChar, 8000));
}
if (!string.IsNullOrEmpty(OrderByStr))
{
command.Parameters.Add(new SqlParameter("@FieldOrder", SqlDbType.VarChar, 8000));
}
command.Parameters.Add(new SqlParameter("@TotalCount", SqlDbType.Int));
command.Parameters.Add(new SqlParameter("@TotalPageCount", SqlDbType.Int));
command.UpdatedRowSource = UpdateRowSource.None;
command.Parameters["@PageSize"].Value = pagesize;
command.Parameters["@PageIndex"].Value = pageIndex;
command.Parameters["@FieldKey"].Value = fdname;
command.Parameters["@FieldShow"].Value = filedName;
command.Parameters["@TableName"].Value = TableName;
if (!string.IsNullOrEmpty(WhereStr))
{
command.Parameters["@Where"].Value = WhereStr;
}
if (!string.IsNullOrEmpty(OrderByStr))
{
command.Parameters["@FieldOrder"].Value = OrderByStr;
}
command.Parameters["@TotalCount"].Direction = ParameterDirection.Output;
command.Parameters["@TotalPageCount"].Direction = ParameterDirection.Output;
SqlDataAdapter sda = new SqlDataAdapter();
sda.SelectCommand = command;
sda.SelectCommand.ExecuteNonQuery();
recordcount = int.Parse(sda.SelectCommand.Parameters["@TotalCount"].Value.ToString());
pageCount = int.Parse(sda.SelectCommand.Parameters["@TotalPageCount"].Value.ToString());
sda.Fill(dbs, "data");
}
}
dt = dbs.Tables[0];
}
catch (Exception ex)
{
LogHelper.Error(ex);
}
return(dt);
}
/// <summary>
/// Base64加密
/// </summary>
/// <param name="text">要加密的字符串</param>
/// <returns></returns>
public static string EncodeBase64(string text)
{
string result = string.Empty;
try
{
//如果字符串为空，则返回
if (ValidationHelper.IsNullOrEmpty <string>(text))
{
return("");
}
var base64Code = new[]
{
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T',
'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', '+', '/', '='
};
const byte empty = 0;
var byteMessage = new ArrayList(Encoding.Default.GetBytes(text));
int messageLen = byteMessage.Count;
int page = messageLen / 3;
int use;
if ((use = messageLen % 3) > 0)
{
for (int i = 0; i < 3 - use; i++)
{
byteMessage.Add(empty);
}
page++;
}
var outmessage = new StringBuilder(page * 4);
for (int i = 0; i < page; i++)
{
var instr = new byte[3];
instr[0] = (byte)byteMessage[i * 3];
instr[1] = (byte)byteMessage[i * 3 + 1];
instr[2] = (byte)byteMessage[i * 3 + 2];
var outstr = new int[4];
outstr[0] = instr[0] >> 2;
outstr[1] = ((instr[0] & 0x03) << 4) ^ (instr[1] >> 4);
if (!instr[1].Equals(empty))
{
outstr[2] = ((instr[1] & 0x0f) << 2) ^ (instr[2] >> 6);
}
else
{
outstr[2] = 64;
}
if (!instr[2].Equals(empty))
{
outstr[3] = (instr[2] & 0x3f);
}
else
{
outstr[3] = 64;
}
outmessage.Append(base64Code[outstr[0]]);
outmessage.Append(base64Code[outstr[1]]);
outmessage.Append(base64Code[outstr[2]]);
outmessage.Append(base64Code[outstr[3]]);
}
result = outmessage.ToString();
}
catch (Exception ex)
{
LogHelper.Error(ex);
}
return(result);
}