自己做项目学习大虾们写的一些工具类1

写在这分享一个xml的日志类，它是用来记录winform软件工作时日常信息，软件的系统异常和数据库异常的，

> 这个例子很好用，也让我们掌握了io类的file类使用和xml类的基本方法，我在项目中使用是为了当我的软件出现问题时可要求客户发送email当日的这个日志记录，这样你可能会知道自己的软件错在那行代码上

using System;

using System.Collections.Generic;

using System.Text;

using System.Xml;

using System.Data.SqlClient;

using System.Collections;

using System.Data;

using System.Web;

using System.IO;

namespace LANServer.Component

{

public static class LogWriter

{

#region Private Fields

private static XmlDocument xmlDocument = new XmlDocument();

private static string xmlFileName = "";

#endregion

#region Private Methods

private static bool HasChild(string name, XmlNode node)

{

XmlNodeList xmlnodelist = node.ChildNodes;

foreach (XmlNode enode in xmlnodelist)

{

if (enode.Name.ToLower() == name.ToLower())

{

return true;

}

}

return false;

}

private static string FormatInt(int num)

{

string formattedString = "";

if (num <= 9)

{

formattedString = "0" + num.ToString();

}

else

{

formattedString = num.ToString();

}

return formattedString;

}

private static string GetFileName()

{

string year = DateTime.Now.Year.ToString();

string month = FormatInt(DateTime.Now.Month);

string day = FormatInt(DateTime.Now.Day);

string path = "./Logs/";

string file = path + "Log_" + year + month + day + ".xml";

return file;

}

/**/

/// <summary>

/// create log file path

/// </summary>

private static void CreateLogFile()

{

string xmlRootElementStr = "<?xml version=/"1.0/" encoding=/"utf-8/"?>/r/n/r/n";

xmlRootElementStr += "<Log>/r/n/r/n";

xmlRootElementStr += "	<Server>/r/n/r/n";

xmlRootElementStr += "		<Infomations>/r/n/r/n";

xmlRootElementStr += "		</Infomations>/r/n/r/n";

xmlRootElementStr += "	</Server>/r/n/r/n";

xmlRootElementStr += "	<System>/r/n";

xmlRootElementStr += "		<Exceptions>/r/n";

xmlRootElementStr += "		</Exceptions>/r/n";

xmlRootElementStr += "	</System>/r/n/r/n";

xmlRootElementStr += "  <Sql>/r/n";

xmlRootElementStr += "		<Exceptions>/r/n";

xmlRootElementStr += "		</Exceptions>/r/n";

xmlRootElementStr += "  </Sql>/r/n/r/n";

xmlRootElementStr += "</Log>/r/n";

xmlFileName = GetFileName();

try

{

//if file inexistence,create a new log file and load this file

if (!System.IO.Directory.Exists("Logs"))

{

Directory.CreateDirectory("Logs");

// File.Create(xmlFileName);

byte[] xmlRootElementByte = System.Text.Encoding.Default.GetBytes(xmlRootElementStr);

System.IO.FileStream fileStream = new FileStream(xmlFileName, FileMode.Create, FileAccess.ReadWrite);

fileStream.Write(xmlRootElementByte, 0, xmlRootElementByte.Length);

fileStream.Close();

xmlDocument.Load(xmlFileName);

}

else

{

if (!System.IO.File.Exists(xmlFileName))

{

// File.Create(xmlFileName);

byte[] xmlRootElementByte = System.Text.Encoding.Default.GetBytes(xmlRootElementStr);

System.IO.FileStream fileStream = new System.IO.FileStream(xmlFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);

fileStream.Write(xmlRootElementByte, 0, xmlRootElementByte.Length);

fileStream.Close();

xmlDocument.Load(xmlFileName);

}

else

{

xmlDocument.Load(xmlFileName);

}

}

}

catch (Exception ex)

{

throw ex;

}

}

#endregion

#region Public Methods

/**/

/// <summary>

/// record a system exception to log

/// </summary>

/// <param name="ex"></param>

public static void AddSystemException(Exception ex)

{

try

{

//Get

CreateLogFile();

XmlNode xmlNode = xmlDocument.SelectSingleNode("//System//Exceptions");

if (!HasChild("exception", xmlNode))

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

xmlNode.AppendChild(exceptionNode);

}

else

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

xmlNode.AppendChild(exceptionNode);

}

xmlDocument.Save(xmlFileName);

}

catch (Exception e)

{

throw e;

}

}

// record a sql exception to log

public static void AddSqlException(Exception ex)

{

//Get

try

{

CreateLogFile();

XmlNode xmlNode = xmlDocument.SelectSingleNode("//Sql//Exceptions");

if (!HasChild("exception", xmlNode))

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

xmlNode.AppendChild(exceptionNode);

}

else

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

xmlNode.AppendChild(exceptionNode);

}

xmlDocument.Save(xmlFileName);

}

catch (Exception e)

{

throw e;

}

}

// record a sql exception to log

public static void AddSqlException(Exception ex,string sqltxt)

{

try

{

//Get

CreateLogFile();

XmlNode xmlNode = xmlDocument.SelectSingleNode("//Sql//Exceptions");

if (!HasChild("exception", xmlNode))

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

XmlElement sqltxtNode = xmlDocument.CreateElement("SQL_Text");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

sqltxtNode.InnerText = sqltxt;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

exceptionNode.AppendChild(sqltxtNode);

xmlNode.AppendChild(exceptionNode);

}

else

{

XmlElement exceptionNode = xmlDocument.CreateElement("exception");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

XmlElement stacktraceNode = xmlDocument.CreateElement("StackTrace");

XmlElement sqltxtNode = xmlDocument.CreateElement("SQL_Text");

DateTime dateTime = DateTime.Now;

string messageString = ex.Message;

string sourceString = ex.Source;

string stacktrace = ex.StackTrace;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

stacktraceNode.InnerText = stacktrace;

sqltxtNode.InnerText = sqltxt;

exceptionNode.AppendChild(timeNode);

exceptionNode.AppendChild(messageNode);

exceptionNode.AppendChild(sourceNode);

exceptionNode.AppendChild(stacktraceNode);

exceptionNode.AppendChild(sqltxtNode);

xmlNode.AppendChild(exceptionNode);

}

xmlDocument.Save(xmlFileName);

}

catch (Exception e)

{

throw e;

}

}

public static void AddServerInfo(String msg, String src)

{

try

{

//Get

CreateLogFile();

XmlNode xmlNode = xmlDocument.SelectSingleNode("//Server//Infomations");

if (!HasChild("Info", xmlNode))

{

XmlElement infoNode = xmlDocument.CreateElement("Info");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

DateTime dateTime = DateTime.Now;

string messageString = msg;

string sourceString = src;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

infoNode.AppendChild(timeNode);

infoNode.AppendChild(messageNode);

infoNode.AppendChild(sourceNode);

xmlNode.AppendChild(infoNode);

}

else

{

XmlElement infoNode = xmlDocument.CreateElement("Info");

XmlElement timeNode = xmlDocument.CreateElement("Time");

XmlElement messageNode = xmlDocument.CreateElement("Message");

XmlElement sourceNode = xmlDocument.CreateElement("Source");

DateTime dateTime = DateTime.Now;

string messageString = msg;

string sourceString = src;

timeNode.InnerText = dateTime.ToString();

messageNode.InnerText = messageString;

sourceNode.InnerText = sourceString;

infoNode.AppendChild(timeNode);

infoNode.AppendChild(messageNode);

infoNode.AppendChild(sourceNode);

xmlNode.AppendChild(infoNode);

}

xmlDocument.Save(xmlFileName);

}

catch (Exception e)

{

throw e;

}

}

#endregion

}

}