c# Replace字串

public static string Replease(string originalStr, string repleasStr, string newStr)
{
int pos = originalStr.IndexOf(repleasStr);
int len = repleasStr.Length;
if (pos != -1)
{
string strLeft = originalStr.Substring(0, pos);
string strRight = originalStr.Substring(pos + len);
return strLeft + newStr + strRight;

}
else
return originalStr;

}

c# 慣用的命名法

識別字種類	習慣的命名原則	範例
常數	使用英文大寫字母和底線"_"符號	MAX_SIZE, PI
變數	使用英文小寫字母開頭，如果是2個英文字組成，第2個之後的英文字以大寫開頭	size, userName
函數	使用英文小寫字母開頭，甘果是2個英文組成，其化英文字使用大寫開頭	pressButton, scrollScreen

c# 格式字元符號

格式字元符號	說明
C	使用貨幣格式顯示數值資料，例如：$123456
Dn	使用十進位來顯示數值資料，之後的n是位數
E	使用科學符號顯示數值資料
Fn	使用指定小數部份的位數為n來顯示數值資料
G	使用一般格式來顯示數值資料
N	使用千分位來顯示數值資料，例如：987,654,321.0
X	使用十六進位來顯示數值資料

c# 將string array轉成文字

public static string[] StringToLines(string inString)
{
string[] org = inString.Split('\n');
int count = org.Length - 1;
string[] outString = new string[count];

try
{
for (int i = 0; i < count; i++)
{
if (org[i].IndexOf('\r') == -1)
org[i] = org[i];
else
org[i] = org[i].Remove(org[i].IndexOf('\r'));
//int j = org[i].IndexOf('\r');

outString[i] = org[i];
}
}
catch
{
return null;
}

return outString;
}

c# 建立空的StreamReader

public static StreamReader GetEmptyStreamReader()
{
MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(ms);
sw.Write("");
sw.Flush();
StreamReader sr = new StreamReader(ms);
return sr;
}

c# 取得檔案列表

// Dir folder
public bool FileList(string folderName)
{
try
{
DirectoryInfo dirinfo = new DirectoryInfo(folderName);

FileInfo[] sortList = dirinfo.GetFiles();
string[] dirList = new string[sortList.Length];
string[] fileName = new string[sortList.Length];


for (int i = 0; i < sortList.Length; i++)
{
dirList[i] = sortList[i].Name.ToString();
fileName[i] = sortList[i].FullName.ToString();


}

FullFileName = fileName;
FileName = dirList;

return true;
}
catch (Exception ex)
{
_errorMessage = ex.ToString();
return false;
}

}

C# 存成文字檔

// Save file name
public static bool FileSaved(string fileName, string inputString)
{
try
{
System.IO.File.AppendAllText(fileName, inputString);
return true;
}
catch (Exception ex)
{
_errorMessage = ex.ToString();
return false;
}

}

C# 搬移檔案

// Move file
public bool FileMove(string orgFileName, string newFileName)
{
try
{
System.IO.File.Move(orgFileName, newFileName);
return true;
}
catch (Exception ex)
{
_errorMessage = ex.ToString();
return false;
}
}

C# 取得文字檔中的內容

// Get file content string
public string FileContent(string fileName)
{

StreamReader stmRdr = new StreamReader(fileName);
string line = stmRdr.ReadLine();
string sLine = null;

while (line != null)
{
if (line.Length != 0)
sLine = sLine + line + '\n';
line = stmRdr.ReadLine();
}
stmRdr.Close();
return sLine;
}

c# FTP的使用 -- 修改檔名(mv)

// Reanme file or remove file
public bool FtpRename()
{
if (this.InputValidation())
{
try
{
Uri UriFtpMove = new Uri("ftp://" + serverhost + ":" + serverport + dirpath + remotefile);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(UriFtpMove);
request.Method = WebRequestMethods.Ftp.Rename;
request.RenameTo = renamefile;
request.Credentials = new NetworkCredential(username, password);

FtpWebResponse response = (FtpWebResponse)request.GetResponse();
returnmsg = response.BannerMessage;
returncode = response.StatusCode.ToString();

return true;
}
catch (Exception ex)
{
returnmsg = ex.ToString();
returncode = "0";
return false;
}
}
else
{
throw new ArgumentException(returnmsg);

}

}

c# FTP的使用 -- 取得FTP Server的檔案列表(ls)

// Get file list
public string[] FtpDir()
{
string Result = "";
if (this.InputValidation())
{
try
{
Uri UriFtpDir = new Uri("ftp://" + serverhost + ":" + serverport + dirpath + filter);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(UriFtpDir);
request.Method = WebRequestMethods.Ftp.ListDirectory;


request.Credentials = new NetworkCredential(username, password);

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

StreamReader MyStreamReader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.Default);
returnmsg = response.BannerMessage;
returncode = response.StatusCode.ToString();

Result = MyStreamReader.ReadToEnd();
}
catch (Exception ex)
{
returnmsg = ex.ToString();
returncode = "0";
throw new ArgumentException(returnmsg);
}

}
else
{
throw new ArgumentException(returnmsg);
}
return Strings.StringToLines(Result);
}

c# FTP的使用 -- 取得FTP Server的檔案(get)

// Get ftp file content
//public StreamReader FtpGet()
public bool FtpGet()
{
FileStream fileStream = null;
Stream responseStream = null;

if (this.InputValidation())
{
try
{
Uri UriFtpGet = new Uri("ftp://" + serverhost + ":" + serverport + dirpath + remotefile);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(UriFtpGet);
request.Method = WebRequestMethods.Ftp.DownloadFile;
request.Credentials = new NetworkCredential(username, password);


FtpWebResponse response = (FtpWebResponse)request.GetResponse();

responseStream = response.GetResponseStream();

returnmsg = response.BannerMessage;
returncode = response.StatusCode.ToString();

// Write into file
if (localfile == null)
localfile = Path.GetFileName(request.RequestUri.AbsolutePath);

fileStream = File.Create(localPath + @"\" + localfile);
byte[] buffer = new byte[1024];

int bytesRead;

while (true)
{

bytesRead = responseStream.Read(buffer, 0, buffer.Length);

if (bytesRead == 0)
break;

fileStream.Write(buffer, 0, bytesRead);

}
responseStream.Close();
fileStream.Close();

return true;

}
catch (Exception ex)
{
returnmsg = ex.ToString();
returncode = "0";
return false;
}
}
else
{
throw new ArgumentException(returnmsg);

}

}

.Net 新手之global.asax - application 的用法 (2)

Application 的執行流程，我參考這一個網站的 sample 做一些改寫，並且標上順序...以方便我未來寫程式時的參考資料。

<%@ Application Language="C#" %>

<script runat="server">

void Application_Start(Object sender, EventArgs e) {
Application.Set("Time", System.DateTime.Now);
}

// 1.
void Application_BeginRequest(Object sender, EventArgs e)
{
Response.Write("<b>Process</b>");
Response.Write("Request is starting...<br>");
}

// 2.
void Application_AuthorizeRequest(Object sender, EventArgs e)
{
Response.Write("Authorizing request...<br>");
}

// 3.
void Application_ResolveRequestCache(Object sender, EventArgs e)
{
Response.Write("Resolving request cache...<br>");
}

// 4.
void Session_Start(Object sender, EventArgs e)
{
Response.Write("Session is starting...<br>");
}

// 5.
void Application_AcquireRequestState(Object sender, EventArgs e)
{
Response.Write("Acquiring request session state" + "...<br>");
}

// 6.
void Application_PreRequestHandlerExecute(Object sender, EventArgs e)
{
Response.Write("Pre Request handler executed...<br>");
}

// 7. 已處理完後的流程
void Application_PostRequestHandlerExecute(Object sender, EventArgs e)
{
Response.Write("Post Request handler executed...<br>");
}


// 8.
void Application_ReleaseRequestState(Object sender, EventArgs e)
{
Response.Write("Releasing request state...<br>");
}

// 9.
void Application_UpdateRequestCache(Object sender, EventArgs e)
{
Response.Write("Updating request cache...<br>");
}

void Application_AuthenticateRequest(Object sender, EventArgs e)
{
Application.Set("Time", System.DateTime.Now);
}

// 10.
void Application_EndRequest(Object sender, EventArgs e)
{
Response.Write("Request is ending...<br>");
}

// 11.
void Application_PreSendRequestHeaders(Object sender, EventArgs e)
{
Response.Write("Receiving request headers...<br>");
}

// 12.
void Application_PreSendRequestContent(Object sender, EventArgs e)
{
Response.Write("Receiving request content...<br>");
}

// Exception
void Application_Error(Object sender, EventArgs e)
{
Response.Write( " is authenticating request...<br>");
}

</script>

.Net 新手之global.asax - application 的用法 (1)

今天 .Net 新手看到了gloabl.asax 的用法，試了幾次後，上來寫寫筆記，感覺上 global.asax 這一個檔案集合了 Web Application 中的所有共用事件，我依網路上提供的範例做了練習，並稍微改寫一下下：

1. 每一個網頁的 header 都要出現 "歡迎光臨"
2. 每一個網頁的 footer 都要看到網頁出現的時間
3. 當有 Error 時，網頁上要出現 "資料庫忙錄中"

首先請先建立在專案的目錄中，一個名為 global.asax 的檔案，檔案內容如下：

<%@ Application Language="C#" %>

<script runat="server">

void Application_Start(Object sender, EventArgs e) {
}

void Application_OnBeginRequest(Object sender, EventArgs E)
{
Response.Write("歡迎光臨<br>");
}

protected void Application_OnEndRequest()
{
Response.Write("<hr>This page was served at " +DateTime.Now.ToString());
}

protected void Application_Error(Object sender, EventArgs e)
{
Response.Write("<span >");
Response.Write("資料庫忙碌中<hr></font>");
Response.Write("<font face=\"Arial\" size=\"2\">");
Server.ClearError();
}

</script>

在 Application_Error 裡頭，也可以將 Error message 寫入 log file 或是以 email 呈現在網頁上，以下是我在網路上所看到的範例：

void Application_Error(object sender, EventArgs e)
{
string Message = "";
Exception ex = Server.GetLastError();
Message = "發生錯誤的網頁:{0}錯誤訊息:{1}堆疊內容:{2}";
Message = String.Format(Message, Request.Path + Environment.NewLine, ex.GetBaseException().Message + Environment.NewLine, Environment.NewLine + ex.StackTrace);

//寫入事件撿視器,方法一
System.Diagnostics.EventLog.WriteEntry("WebAppError", Message, System.Diagnostics.EventLogEntryType.Error);

//寫入文字檔,方法二
System.IO.File.AppendAllText(Server.MapPath(string.Format("Log\\{0}.txt", DateTime.Now.Ticks.ToString())), Message);

//寄出Email,方法三
//此方法請參考System.Net.Mail.MailMessage

//清除Error
Server.ClearError();

Response.Write("系統錯誤,請聯絡系統管理員!!");

}

而我們也可以利用 web.config file，依據錯誤的類型而導到不同的網頁，xml tag 是 <customErrors>，如下：

<customErrors defaultRedirect="GeneralError.htm" mode="on">
<error statuscode="404" redirect="FileNotFound.htm"/>
</customErrors>

可以利用Application_BeginRequest，在使用瀏灠網頁時，記錄user id, current time(System.DateTime.Now) 以及 Path(Request.AppRelativeCurrentExecutionFilePath) 等等資訊，可以做為使用者的喜好分析或是檔案下載分析……