Bài giảng - giáo án: Bài tập thực hành môn lập trình web

Flash Cards
FlashCardClass.cs
public class FlashCardClass
{
int mintFirstNumber, mintSecondNumber;
string[] mstrOp_list = { "+", "-", "*", "/", "%" };
string mstrOp="+";
Random mrndNumber;
int min, max;
public int Min
{
get
{
return min;
}
set
{
min = value;
}
}

public int Max
{
get { return max; }
set { max = value; }
}

public FlashCardClass()
{
// Initialize the random number generator object.
mrndNumber = new Random();

}

public void Shuffle()
{
// Get random numbers.
mintFirstNumber = mrndNumber.Next(Min, Max+1);
mintSecondNumber = mrndNumber.Next(Min, Max+1);
mstrOp = mstrOp_list[mrndNumber.Next(0, 5)];
}

public int FirstNumber
{
get
{
return mintFirstNumber;
}
}

public int SecondNumber
{
get
{
return mintSecondNumber;
}
}

public string Operation
{
get
{

return mstrOp;
}
set
{
mstrOp = value;
}
}

// Calculates answer based on current operation.
public int Answer()
{
switch (mstrOp)
{
case "+":
return mintFirstNumber + mintSecondNumber;
case "x":
return mintFirstNumber * mintSecondNumber;
case "*":
return mintFirstNumber * mintSecondNumber;
case "-":
return mintFirstNumber - mintSecondNumber;
case "/":
return mintFirstNumber / mintSecondNumber;
case "%":
return mintFirstNumber % mintSecondNumber;
default:
return 0;
}
}

}
FlashCard.aspx


FlashCard.aspx.cs
public partial class FlashCard : System.Web.UI.Page
{
FlashCardClass FlashCard1;
protected void Page_Load(object sender, EventArgs e)
{
txtAnswer.Focus();
// Run the following code the first time the page is displayed.
if (!IsPostBack)
{
FlashCard1 = new FlashCardClass();
Session["FlashCard"] = FlashCard1;
}
else
{
// Get the Session FlashCard object.
FlashCard1 = (FlashCardClass)Session["FlashCard"];
}
FlashCard1.Min = int.Parse(TextBox1.Text);
FlashCard1.Max = int.Parse(TextBox2.Text);
RefreshDisplay();

}
protected void txtAnswer_TextChanged(object sender, EventArgs e)
{
if (txtAnswer.Text == FlashCard1.Answer().ToString())

{
lblFeedback.Text = "Correct!";
// Get another set of numbers.
FlashCard1.Shuffle();
// Refresh display to show new numbers.
RefreshDisplay();
}
else
{
lblFeedback.Text = "Oops! Try Again.";
}
txtAnswer.Text = "";
}

private void RefreshDisplay()
{
TextBox2.Text = FlashCard1.Max.ToString();
TextBox1.Text = FlashCard1.Min.ToString();
lblFirst.Text = FlashCard1.FirstNumber.ToString();
lblSecond.Text = FlashCard1.Operation +
FlashCard1.SecondNumber.ToString();
}
Translator
TranslatorClass.cs
public class TranslatorClass
{
string mstrText, mstrOriginal;

// Controls access to class-level variables.
public string Text

{
get
{
return mstrText;
}
set
{
mstrText = value;
// Keep a copy of the original for Restore.
mstrOriginal = value;
}
}

// Restores translated text back to the original.
public void Restore()
{
mstrText = mstrOriginal;
}

// Translates the value in the Text property.
public void Translate()
{
string strWord;
string[] arrWords;
bool bCaps = false;
// Convert the string into an array using System.String.
arrWords = mstrText.Split(' ');
for (int intCount = 0; intCount <= arrWords.GetUpperBound(0);
intCount++)
{

// Change to lowercase.
strWord = arrWords[intCount].ToLower();
// Check if word is capitalized.
if (!arrWords[intCount].Equals(strWord))
bCaps = true;
// Do translation.
if (strWord != "")
{
strWord = strWord.Substring(1, strWord.Length - 1) +
strWord.Substring(0, 1) + "ay";
// Recapitalize if necessary.
if (bCaps)
strWord = strWord.Substring(0, 1).ToUpper() +
strWord.Substring(1, strWord.Length - 1);
}
// Store the word back in the array.
arrWords[intCount] = strWord;
// Reset the caps flag.
bCaps = false;
}
// Rebuild the string from the array.
mstrText = String.Join(" ", arrWords);
}
}
Translator.aspx

Translator.aspx.cs
public partial class Translator : System.Web.UI.Page
{
TranslatorClass TransClass;

protected void Page_Load(object sender, EventArgs e)
{
// The first time this page is displayed
if (!IsPostBack)
{
// Create a new Translator object.
TransClass = new TranslatorClass();
// Store the object in a Session state variable.
Session["TransClass"] = TransClass;
}
else
// Get the Session TransClass variable.
TransClass = (TranslatorClass)Session["TransClass"];
}

protected void butTranslate_Click(object sender, System.EventArgs e)
{
// Declare a boolean switch.
bool bSwitch;
// Check if ViewState variable exists.
if (ViewState["bSwitch"] != null)
// Get the value from ViewState and switch it.
bSwitch = !(bool)ViewState["bSwitch"];
else
// Set the switch.
bSwitch = true;
// Save the new value in ViewState.
ViewState["bSwitch"] = bSwitch;
// Use the switch to either translate or restore

// the text in txtSource.
if (bSwitch)
{
// Get the text.
TransClass.Text = txtSource.Text;
// Translate it.
TransClass.Translate();
// Display the text.
txtSource.Text = TransClass.Text;
// Change the Button text.
butTranslate.Text = "Restore";
}
else
{
// Restore the original text.
TransClass.Restore();
// Display the text.
txtSource.Text = TransClass.Text;
// Change the Button text.
butTranslate.Text = "Translate";
}
}
WebTextEditor

SignOn.aspx

public partial class SignOn : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)

{

}
protected void butSignOn_Click(object sender, System.EventArgs e)
{
string strPath;
// If the user exists, there is a directory of the same name.
strPath = Server.MapPath(Request.ApplicationPath) + "\\"
+ txtName.Text;
if (Directory.Exists(strPath))
{
// Set session variables.
Session["Path"] = strPath;
Server.Transfer("FileManager.aspx");
}
else
{
Session["NewName"] = txtName.Text;
// Otherwise, report that user wasn't found.
litNoAccount.Text = "<p>The name " + txtName.Text +
" wasn't found. Check the name, or click " +
"<A href='NewAccount.aspx'>here</A> if you " +
"are a new user.</p>";
}
}

}
NewAccount.aspx

NewAccount.aspx.cs

public partial class NewAccount : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
txtName.Text=Session["NewName"].ToString();
}

protected void butCreate_Click(object sender, System.EventArgs e)
{
string strPath;
//Check if directory exists.
strPath = Server.MapPath(Request.ApplicationPath) + "\\"
+ txtName.Text;
if (Directory.Exists(strPath))
{
// Tell the user to choose another name.
litNameExists.Text = "<p>The name " + txtName.Text +
" already exists. Please choose a different one.</p>";
return;
}
else
{
try
{
// Create the directory.
Directory.CreateDirectory(strPath);
// Set the session variable.
Session["Path"] = strPath;
// Go to file manager.
Server.Transfer("FileManager.aspx");

}
catch (System.UnauthorizedAccessException ex)
{
Server.Transfer("NotAuthorized.aspx");
}
}
}
FileManager.aspx

FileManager.aspx.cs
public partial class FileManager : System.Web.UI.Page
{
string strPath;
public string[] strFiles;

protected void Page_Load(object sender, System.EventArgs e)
{
// Get path.
strPath = Session["Path"].ToString();
// If this is not a post-back event.
if (!Page.IsPostBack)
{
// Get list of files in the current directory.
strFiles = Directory.GetFiles(strPath);
// Get the short names for the files.
for (int iCount = 0; iCount <= strFiles.GetUpperBound(0);
iCount++)
strFiles[iCount] =
Path.GetFileName(strFiles[iCount]);
}

// Bind lstFiles to file array.
lstFiles.DataSource = strFiles;
lstFiles.DataBind();
}

protected void butNew_Click(object sender, System.EventArgs e)
{
//If there is a file name, then start the editor.
if (!(txtNewFile.Text == ""))
Response.Redirect("EditFile.aspx?file=" +
txtNewFile.Text);
else
// Otherwise, display a message.
litNoFile.Text = "<p>You must enter the name of a file " +
" to create.<p>";
}

protected void butEdit_Click(object sender, System.EventArgs e)
{
// If there is a file name, then start the editor.
if (lstFiles.SelectedItem != null)
Response.Redirect("EditFile.aspx?file=" +
lstFiles.SelectedItem.ToString());
else
// Otherwise, display a message.
litNoneSelected.Text = "<p>You must select a file.<p>";
}

protected void butDelete_Click(object sender, System.EventArgs e)
{

// If there is a file name, then start the editor.
if (lstFiles.SelectedItem != null)
try
{
File.Delete(strPath + "\\" +
lstFiles.SelectedItem.ToString());
lstFiles.Items.Remove(lstFiles.SelectedItem);
}
catch (System.UnauthorizedAccessException ex)
{
Server.Transfer("NotAuthorized.aspx");
}
else
// Otherwise, display a message.
litNoneSelected.Text = "<p>You must select a file.<p>";
}

}


EditFile.aspx

EditFile.aspx.cs
public partial class EditFile : System.Web.UI.Page
{
string strPath;
string strFile;

protected void Page_Load(object sender, System.EventArgs e)
{

// Get the path and file names.
strPath = Session["Path"].ToString();
strFile = Request.QueryString["file"];
// If this is not a post-back event.
if (!Page.IsPostBack)
{
StreamReader strmEditFile;
try
{
// Open the file.
strmEditFile = File.OpenText(strPath + "\\" +
strFile);
// Read its text.
txtEditFile.Text =
strmEditFile.ReadToEnd().ToString();
// Close the file.
strmEditFile.Close();
}
catch (FileNotFoundException ex)
{
// If it doesn't exist, create it.
File.CreateText(strPath + "\\" +
strFile).Close();
// Clear text box.
txtEditFile.Text = "";
}
catch (System.UnauthorizedAccessException ex)
{
Server.Transfer("NotAuthorized.aspx");
}

}
}

protected void butExit_Click(object sender, System.EventArgs e)
{
if ((ViewState["Changed"] != null) &&
(ViewState["Changed"].ToString() == "true"))
SaveFile();
// Return to File Manager.
Server.Transfer("FileManager.aspx");
}

protected void txtEditFile_TextChanged(object sender, System.EventArgs e)
{
// Set changed flag.
ViewState["Changed"] = "true";
}

protected void butSave_Click(object sender, System.EventArgs e)
{
SaveFile();
}

void SaveFile()
{
StreamWriter strmEditWrite;
// Delete the file.
File.Delete(strPath + strFile);
// Create the file with new text.
strmEditWrite = File.CreateText(strPath + "\\" + strFile);

strmEditWrite.Write(txtEditFile.Text);
strmEditWrite.Close();
// Reset changed flag.
ViewState["Changed"] = "false";
}

}
NotAuthorized.aspx




Quản lý thông tin người dùng
SignOn.aspx

SignOn.aspx.cs
public partial class SignOn : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
protected void btnSignOn_Click(object sender, EventArgs e)
{
string strPath;
// If the user exists, there is a directory of the same name.
strPath = Server.MapPath(Request.ApplicationPath) + "\\"
+ tbAccount.Text;

if (Directory.Exists(strPath))
{
if (checkPassword(tbAccount.Text, tbPassword.Text) == true)
{
// Set session variables.
Session["Path"] = strPath;
Server.Transfer("UserInformation.aspx");
}
}
else
{
Session["NewName"] = tbAccount.Text;
// Otherwise, report that user wasn't found.
lit.Text = "<p>The name " + tbAccount.Text +
" wasn't found. Check the name, or click " +
"<A href='NewAccount.aspx'>here</A> if you " +
"are a new user.</p>";
}
}

private bool checkPassword(string acc,string pass)
{
string truepas;
string strPath = Server.MapPath(Request.ApplicationPath) + "\\" +
acc;
StreamReader strmEditFile;
try
{
// Open the file.
strmEditFile = File.OpenText(strPath + "\\" + "password.txt");

// Read its text.
truepas = strmEditFile.ReadToEnd().ToString();
// Close the file.
strmEditFile.Close();

if (truepas == pass)
{
return true;
}
else
{
lit.Text = "Password incorrect";
return false;
}
}
catch (FileNotFoundException ex)
{
lit.Text = "Error!Password file doesn't exist";
return false;
}
}
}

NewAccount.aspx

NewAccount.aspx.cs
public partial class NewAccount : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

tbName.Text=Session["NewName"].ToString();
}

protected void btnCreate_Click(object sender, EventArgs e)
{
string strPath;
//Check if directory exists.
strPath = Server.MapPath(Request.ApplicationPath) + "\\"
+ tbName.Text;
if (Directory.Exists(strPath))
{
// Tell the user to choose another name.
lit.Text = "<p>The name " + tbName.Text +
" already exists. Please choose a different one.</p>";
return;
}
else
{
try
{
// Create the directory.
Directory.CreateDirectory(strPath);
SaveInfo(strPath);
// Set the session variable.
Session["Path"] = strPath;
// Go to file manager.
Server.Transfer("UserInformation.aspx");
}
catch { }
/*catch (System.UnauthorizedAccessException ex)

{
Server.Transfer("NotAuthorized.aspx");
}*/
}
}

void SaveInfo(string strPath)
{
StreamWriter strmEditWrite;

strmEditWrite = File.CreateText(strPath + "\\" + "information.txt");

strmEditWrite.Write(tbRealname.Text+"\n"+tbBirthday.Text+"\n"+tbBirthyear.Tex
t);
strmEditWrite.Close();

strmEditWrite = File.CreateText(strPath + "\\" + "password.txt");
strmEditWrite.Write(tbPassword.Text);
strmEditWrite.Close();

}
}
UserInformation.aspx

UserInformation.aspx.cs
public partial class UserInformation : System.Web.UI.Page
{
string strPath;
protected void Page_Load(object sender, EventArgs e)
{

// Get the path and file names.
strPath = Session["Path"].ToString();

// If this is not a post-back event.
if (!Page.IsPostBack)
{
StreamReader strmEditFile;
try
{
// Open the file.
strmEditFile = File.OpenText(strPath + "\\" +
"information.txt");
// Read its text.
string x = strmEditFile.ReadToEnd().ToString();
tbMulti.Text = x;
string[] px = x.Split('\n');
for (int i = 0; i < px.Length; i++)
Response.Write(px[i]+"<br>");
// Close the file.
strmEditFile.Close();
}
catch { }
}
}
}

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BÀI THỰC HÀNH
ContactManagment

Tạo các trang
- SwitchBoard.aspx
- Calls.aspx
- AddContact.aspx
- DeleteContact.aspx
- ContactTypes.aspx

1. Thiết kế trang SwitchBoard.aspx



2. Thiết kế trang AddContact
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3/18


Thêm vào Website class DataSet
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Tạo truy vấn Insert:
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