OOP Class14
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 = ""; 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 familiar with c# syntax
- Basic object types (int, bool, string)
- Conditional and Branching statements
- Arrays and Generics ie List
- Understand Classes and Inheritance.
- Use some advanced class features such as abstract classes and virtual methods that are overridden
- Understand class relationships
- Is A
- Has A
- Uses A
- Understand Encapsulation, Abstraction and Polymorphism
- Abstraction
- Each class should abstract its behavior in order to increase usability, reuse, and organization.
- Encapsulation
- Each class should contain all of the properties and methods it needs. It should only expose what is necessary to outside classes.
- Polymorphism
- many forms, same code interface but interchangeable classes
- Be able to read and create UML Diagrams
- Be able to recognize and use simple design patters
The final will be consist of two sections the writtens section and the practical section. The practical section will be open everything excpet open mouth (yes open note open book open web). You will not be ablt to use any of theese resources during the written section.