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

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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) { [...]... strmEditFile.Close(); } catch { } } } } 1/18 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 2/18 3/18 Thêm vào Website class DataSet 4/18 5/18 6/18 7/18 Tạo truy vấn Insert: 8/18 9/18 TRở về Form AddContact Thiết lập nguồn dữ liệu cho DropDownList drpContactTypes... 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... file."; } } 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... 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... 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... behind : 15/18 16/18 17/18 Thiết kế trang Call.aspx DropdownList 18/18 Quản lý mặt hàng Default.aspx XemDanhSachMatHang.aspx XemDanhSachMatHang.aspx.cs public partial class XemDanhSachMatHang : System .Web. UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { OleDbConnection con = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\Products.mdb;Persist . } catch { } } } } 1/18 BÀI THỰC HÀNH ContactManagment Tạo các trang - SwitchBoard.aspx - Calls.aspx - AddContact.aspx - DeleteContact.aspx - ContactTypes.aspx 1. Thiết kế. 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);. Button text. butTranslate.Text = "Translate"; } } WebTextEditor SignOn.aspx public partial class SignOn : System .Web. UI.Page { protected void Page_Load(object sender, EventArgs
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