示例介绍：
类Parser是一个对Log文件进行分析的class.在对log文件进行分析的时候，会需要花费一定的时间。这样就必须使用异步的方法进行分析：即分析结束之后发送一个消息给调用程序，告诉调用程序分析过程结束,以便调用程序进行相应的处理。以下是完整的source code.
Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
using System.Windows.Forms;
using LogQuery = MSUtil.LogQueryClassClass;
using EventLogInputFormat = MSUtil.COMEventLogInputContextClassClass;
using IISLogInputFormat = MSUtil.COMIISW3CInputContextClassClass;
using LogRecordSet = MSUtil.ILogRecordset;
using System.Data;
using System.Runtime.Serialization;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Threading;
using System.Runtime.Remoting.Messaging;
namespace winlogparser
{
[Serializable]
public class Parser
{
private string logArguments = "";
public ArrayList selectField;
private string intoField;
private string fromField;
private string whereField;
public string conditonField1="";
public string conditonField2="";
public string conditonField3="";
public string conditonField4="";
public string conditonArg1 = "";
public string conditonArg2 = "";
public string conditonArg3 = "";
public string conditonArg4 = "";
public string conditonValue1 = "";
public string conditonValue2 = "";
public string conditonValue3 = "";
public string conditonValue4 = "";
public string conditonAndOr1 = "";
public string conditonAndOr2 = "";
public string conditonAndOr3 = "";
private string groupByField;
private int parseTimeTaken;
public bool ScriptManually;
private DataTable dt_Result;
public DataTable dt_ListSource;
public DataTable DataTable_Result
{
get
{
return dt_Result;
}
set
{
dt_Result = value;
}
}
public int ParseTimeTaken
{
get
{
return parseTimeTaken;
}
set
{
parseTimeTaken = value;
}
}
public Parser()
{
selectField = new ArrayList();
intoField = "";
fromField = "";
whereField = "";
groupByField = "";
dt_Result = null;
ScriptManually = false;
}
public string SelectField
{
get
{
if (selectField.Count == 0)
return null;
else
{
string tempStr="select ";
for (int i = 0; i < selectField.Count; i++)
{
tempStr += selectField[i];
if (i < selectField.Count - 1)
tempStr += ",";
}
return tempStr;
}
}
}
public string IntoField
{
get
{
if (intoField == "")
return null;
else
return " into " + intoField;
}
set
{
intoField = value;
}
}
public string FromField
{
get
{
if (fromField =="")
return null;
else
return " from " + fromField;
}
set
{
fromField = value;
}
}
public string WhereField
{
get
{
if (whereField == "")
return null;
else
return " where " + whereField;
}
set
{
whereField = value;
}
}
public string LogArguments
{
get
{
return logArguments;//SelectField + FromField +WhereField;
}
set
{
logArguments = value;
}
}
public DataTable CreateListSource(string fieldName)
{
if (fieldName == "")
return null;
DataColumn dc = new DataColumn(fieldName, typeof(string));
DataTable dt = new DataTable();
dt.Columns.Add(dc);
string strSql = "select distinct " + fieldName + " from " + fromField;
LogQuery query = new LogQuery();
IISLogInputFormat oIISInput = new IISLogInputFormat();
LogRecordSet oRecordSet = query.Execute(strSql, oIISInput);
for (; !oRecordSet.atEnd(); oRecordSet.moveNext())
{
DataRow dr=dt.NewRow();
dr[0]=oRecordSet.getRecord().getValue(0).ToString();
dt.Rows.Add(dr);
}
//dt_ListSource = dt;
return dt;
}
/// <summary>
/// get listsource for combobox asychronousely
/// </summary>
public delegate DataTable CreateListDelegate(string fieldName);
public void BeginToCreateListSource(string fieldName)
{
CreateListDelegate dc = new CreateListDelegate(this.CreateListSource);
AsyncCallback cb = new AsyncCallback(this.GetListOnCallback);
IAsyncResult ar = dc.BeginInvoke(fieldName,cb, null);
}
public delegate void GetListCompleted();
public event GetListCompleted OnGetListCompletedHandler;
public void GetListOnCallback(IAsyncResult ar)
{
CreateListDelegate pd = (CreateListDelegate)((AsyncResult)ar).AsyncDelegate;
try
{
DataTable dt =pd.EndInvoke(ar);
this.dt_ListSource = dt;
if (OnGetListCompletedHandler != null)
OnGetListCompletedHandler();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private DataTable CreateDataSource()
{
DataTable dt = new DataTable();
for (int i = 0; i < selectField.Count; i++)
{
DataColumn dc = new DataColumn(selectField[i].ToString(), typeof(string));
dt.Columns.Add(dc);
}
return dt;
}
//delegate for Parsing
public delegate DataTable ParseDelegate();
public DataTable Parse()
{
LogQuery query = new LogQuery();
IISLogInputFormat oIISInput = new IISLogInputFormat();
LogRecordSet oRecordSet = query.Execute(LogArguments, oIISInput);
DataTable dt =CreateDataSource();
for (; !oRecordSet.atEnd(); oRecordSet.moveNext())
{
DataRow dr=dt.NewRow();
for(int index=0;index < selectField.Count;index++)
{
dr[index]=oRecordSet.getRecord().getValue(index).ToString();
}
dt.Rows.Add(dr);
}
//dg.DataSource = dt;
// dg.Show();
return dt; //this.dt_Result;
}
//parse log file asynchronousely
public void BeginToParse()
{
ParseDelegate dc = new ParseDelegate(this.Parse);
AsyncCallback cb = new AsyncCallback(this.GetResultsOnCallback);
IAsyncResult ar = dc.BeginInvoke(cb, null);
}
/// <summary>
/// asynchronize
/// </summary>
///
public delegate void ParseCompleted();
public event ParseCompleted OnparseCompletedHandler;
public void GetResultsOnCallback(IAsyncResult ar)
{
ParseDelegate pd = (ParseDelegate)((AsyncResult)ar).AsyncDelegate;
try
{
DataTable dt = null;
dt=pd.EndInvoke(ar);
this.dt_Result = dt;
MessageBox.Show("the log has parsed successfully!", "Windows LogPaser parsing Result", MessageBoxButtons.OK, MessageBoxIcon.Information);
//send out a event;
if (OnparseCompletedHandler != null)
OnparseCompletedHandler();
//return dt;
//Console.WriteLine("On CallBack :result is " + result);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
// return null;
}
}
}
public class SerializeParseSQL
{
private Parser parser;
public string templateCreatedTime;
public SerializeParseSQL()
{
}
public SerializeParseSQL(Parser parserObj)
{
parser = parserObj;
}
public void SaveParseSQL(string filename)
{
FileStream fs = new FileStream(filename, FileMode.Create);
BinaryFormatter binF = new BinaryFormatter();
binF.Serialize(fs, parser);
fs.Close();
}
public void ReadParseSQLTemplate(string filename, out Parser parser)
{
FileStream fs = new FileStream(filename, FileMode.Open,FileAccess.Read, FileShare.Read);
BinaryFormatter binF = new BinaryFormatter();
parser=(Parser)binF.Deserialize(fs);
}
}
}