Difference between revisions of "OOP Class14"
(→Exta Sruff) |
|||
Line 6: | Line 6: | ||
===write file=== | ===write file=== | ||
− | <csharp>string fileName = "test.txt"; | + | <csharp> string fileName = "test.txt"; |
string folderPath = "c:\\user\\"; | string folderPath = "c:\\user\\"; | ||
Line 30: | Line 30: | ||
===read file=== | ===read file=== | ||
− | <csharp>StreamReader sr = new StreamReader(fs); | + | <csharp> StreamReader sr = new StreamReader(fs); |
while( sr.Peek() > -1 ) | while( sr.Peek() > -1 ) | ||
{ | { |
Revision as of 19:35, 3 May 2006
Contents
Extra Stuff
File IO
write file
<csharp> string fileName = "test.txt";
string folderPath = "c:\\user\\";
FileStream fs;
//Make sure the the File exists if not create it if so open it if (!(File.Exists(folderPath + fileName))) { fs = File.Create(folderPath + fileName); } else { fs = new FileStream( folderPath + fileName , FileMode.Open, FileAccess.ReadWrite ); }
StreamWriter sw = new StreamWriter(fs); //use streamwriter to write to file sw.Write("Hello World!!!"); sw.Close(); //close writer fs.Close(); //close file stream</csharp>
http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class14/hellowrite.cs
read file
<csharp> StreamReader sr = new StreamReader(fs);
while( sr.Peek() > -1 ) { Console.WriteLine(sr.ReadLine()); } sr.Close();</csharp>
http://iam.colum.edu/oop/gbrowser.php?file=/classsource/class14/echoFile.cs
File Counter
http://iam.colum.edu/oop/classsource/class14/hitCounter.aspx [- source]
Send Mail
<csharp><% @Page Language="C#" %> <% @Import Namespace="System.Web.Mail" %> <%
//set up some strings for the email string strTo = "only_a_test@fastmail.fm"; string strFrom = "jeff@interactive.colum.edu"; string strSubject = "Hi jeff"; string strBody = "A real nice body text here"; //Send email SmtpMail.SmtpServer = "localhost"; SmtpMail.Send(strFrom, strTo, strSubject, strBody);
%></csharp> http://iam.colum.edu/oop/classsource/class14/mail.aspx [-source]
Upload a File
http uploader
Add executionTimeout and maxRequestLength to the web.config so that large uploads will not fail.
<xml> <configuration>
<system.web> <httpRuntime executionTimeout="1200" maxRequestLength="65536" /> </system.web>
</configuration> </xml>
multipart form <csharp> <form enctype="multipart/form-data" runat="server"> <tr>
<td>Select file to upload:</td> <td> <input id="myfile" type="file" runat="server"></td>
</tr> <tr>
<td> <input type=button id="btnUploadTheFile" value="Upload" OnServerClick="btnUploadTheFile_Click" runat="server" /> </td>
</tr> </form> </csharp>
Parse the multipart form and save the file msdn library. System.Web.HtmlInputFile.PostedFile Property
<csharp> void btnUploadTheFile_Click(object Source, EventArgs evArgs) {
//Path to save file string strBaseLocation = "c:\\infod\\dangerdanger\\upload\\"; if (null != myfile.PostedFile) { // Get the HTTP posted file instance (to simplify the code) HttpPostedFile postedfile = myfile.PostedFile; // Get the filename string filename = new System.IO.FileInfo(postedfile.FileName).Name; string filesize = postedfile.ContentLength.ToString(); try { myfile.PostedFile.SaveAs(strBaseLocation+filename); txtOutput.InnerHtml = "File " + strBaseLocation + filename + " uploaded successfully"; } catch (Exception e) { txtOutput.InnerHtml = "Error saving " + strBaseLocation + filename + "
"+ e.ToString();
} //Do some other stuff //maybe like send an email to let admin know file was uploaded }
} </csharp>
http://iam.colum.edu/oop/classsource/class14/up.aspx [up.aspx - source] [web.config - source]
Final Review
Be very familar with c# syntax
Understand Classes and inhertance.
Use some advanced class features such as abstract classes and virual methods that are overridden
Understand class relationships
Is A Has A Uses A
Be able to read UML Diagrams
class 14