读写日志文件

日志为文本文件
每列以制表符隔开 行以换行符隔开

本次示例简单实现如下相关功能：
1.正写日志文本 最新的日志放后面
2.倒写日志文本 最新的日志放前面
3.读日志文本内容显示在Label
4.读日志文本内容到DataTable 及 筛选后显示在GridView
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(以下操作并没有考虑相关如文件不存在等异常)

//1.正写日志 最新日志放最后面
protected void Button1_Click(object sender, EventArgs e)
{
    string strFilePath = Server.MapPath("log/log_200807_1.txt");
    System.IO.FileStream fs = new System.IO.FileStream(strFilePath, System.IO.FileMode.Append);
    System.IO.StreamWriter sw = new System.IO.StreamWriter(fs, System.Text.Encoding.Default);
    sw.WriteLine("'" + DateTime.Now.ToString() + "' 'zhangsan' 'Login.aspx' '登录A'");
    sw.Close();
    fs.Close();
}
//2.倒写日志 最新日志放最前面
protected void Button2_Click(object sender, EventArgs e)
{
    string strFilePath = Server.MapPath("log/log_200807_1.txt");
    string strOldText = File.ReadAllText(strFilePath, System.Text.Encoding.Default);
    File.WriteAllText(strFilePath, "'" + DateTime.Now.ToString() + "' 'zhangsan' 'Login.aspx' '登录B' ", System.Text.Encoding.Default);
    File.AppendAllText(strFilePath, strOldText, System.Text.Encoding.Default);
}

//3.读日志文本到Label
protected void Button3_Click(object sender, EventArgs e)
{
    string strFilePath = Server.MapPath("log/log_200807_1.txt");
    FileStream fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Read);
    StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default);
    string strLine = sr.ReadLine();
    string str = "";
    while (strLine != null)
    {
        str += strLine.ToString() + "<br/>";
        strLine = sr.ReadLine();
    }
    sr.Close();
    fs.Close();
    this.Label1.Text = str;
}
//4.读日志文本内容到DataTable及筛选后显示在GridView
protected void Button4_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.Add("日志时间");
    dt.Columns.Add("操作人员");
    dt.Columns.Add("日志页面");
    dt.Columns.Add("日志内容");
    
    string strFilePath = Server.MapPath("log/log_200807_1.txt");
    FileStream fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Read);
    StreamReader sr = new StreamReader(fs, System.Text.Encoding.Default);
    string strLine = sr.ReadLine();
    
    while (strLine != null)
    {
        string[] strArray = new string[4];
        strArray = strLine.Split(' ');
        DataRow dr = dt.NewRow();
        dr[0] = strArray[0];
        dr[1] = strArray[1];
        dr[2] = strArray[2];
        dr[3] = strArray[3];
        dt.Rows.Add(dr);
        strLine = sr.ReadLine();
    }
    sr.Close();
    fs.Close();
    //筛选
    DataView dv = dt.DefaultView;
    dv.RowFilter = " 日志内容 Like '%A%' and 日志时间 >= '2008-7-8 14:12:50' ";
    //this.GridView1.DataSource = dt;
    this.GridView1.DataSource = dv;
    this.GridView1.DataBind();
}

//取得当前所应操作的日志文件的路径 
private string GetLogFilePath() 
{ 
string strFilePath = ""; 
string strYearMonth = DateTime.Now.ToString("yyyyMM"); 
string strLogDirPath = Server.MapPath("log"); 
//判断当前月份是否已有日志文件 
string[] strFilesArray = Directory.GetFiles(strLogDirPath, "log_" + strYearMonth + "_*.txt"); 
if (strFilesArray.Length == 0) 
{ 
strFilePath = Server.MapPath("log/log_" + strYearMonth + "_1.txt"); 
//之前没有本年月的日志文件 需要新建 
using (File.Create(strFilePath)) 
{

} 
} 
else 
{ 
int intOrderID = 1; 
for (int i = 0; i < strFilesArray.Length; i++) 
{ 
string strA = strFilesArray[i].Trim(); 
strA = strA.Substring(strA.LastIndexOf("_")+1); 
strA = strA.Replace(".txt", ""); 
int intA = Convert.ToInt32(strA); 
if (intA > intOrderID) 
intOrderID = intA; 
}

strFilePath = Server.MapPath("log/log_" + strYearMonth + "_" + intOrderID.ToString() + ".txt"); 
this.Label1.Text = strFilePath; 
//之前有 需要判断最后一个是否超容 
FileInfo fileInfo = new FileInfo(strFilePath); 
if (fileInfo.Length >= 1024) 
{ 
//超容了 新建之 
int intCount = intOrderID + 1; 
strFilePath = Server.MapPath("log/log_" + strYearMonth + "_" + intCount.ToString() + ".txt"); 
using (File.Create(strFilePath)) 
{

} 
} 
} 
return strFilePath ; 
}

讀寫ini文件 
[DllImport("kernel32")] 
private static extern long WritePrivateProfileString(string section, 
string key,string val,string filePath); 
[DllImport("kernel32")] 
private static extern int GetPrivateProfileString(string section, 
string key,string def, StringBuilder retVal,int size,string filePath);

public void IniWriteValue(string Section,string Key,string Value,string filePath) 
{ 
WritePrivateProfileString(Section,Key,Value,filePath); 
public string IniReadValue(string Section,string Key,string filePath) 
{ 
StringBuilder temp = new StringBuilder(255); 
int i = GetPrivateProfileString(Section,Key,"",temp, 
255, filePath); 
return temp.ToString();

}

} 

获取指定文件夹的大小 
public long countsize( System.IO.DirectoryInfo dir) 
{ 
long size=0; 
FileInfo[] files=dir.GetFiles(); 
foreach(System.IO.FileInfo info in files) 
{ 
size+=info.Length; 
} 
DirectoryInfo[] dirs=dir.GetDirectories(); 
foreach(DirectoryInfo dirinfo in dirs) 
{ 
size+=countsize(dirinfo); 
} 
return size; 
}  

讀取資源檔： 
ResourceManager _textResManager = new ResourceManager("testproject.MultiLanguage_Eng", Assembly.GetExecutingAssembly()); 
string resString = _textResManager.GetString("keyname");