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In: Computer Science

how to code in c# to get the total number of 1's as the numbers are...

how to code in c# to get the total number of 1's as the numbers are added in a Listbox in windows forms

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Expert Solution

Answer.

  1. namespace test   
  2. {   
  3. using System;   
  4. using System.Drawing;   
  5. using System.Collections;   
  6. using System.ComponentModel;   
  7. using System.Windows.Forms;   
  8. using System.Data;   
  9. public class ListBox : System.Windows.Forms.Form   
  10. {   
  11. private System.ComponentModel.Container container;   
  12. private System.Windows.Forms.Button buttonAdd;   
  13. private System.Windows.Forms.Button buttonClose;   
  14. private System.Windows.Forms.Button buttonModify;   
  15. private System.Windows.Forms.Button buttonDelete;   
  16. private System.Windows.Forms.Button buttonMoveUp;   
  17. private System.Windows.Forms.Button buttonMoveDown;   
  18. private System.Windows.Forms.ListBox listbox;   
  19. private System.Windows.Forms.TextBox textbox;   
  20. private System.Windows.Forms.Label label;   
  21. private int nSelectedIndex;   
  22. //*********SIZE & LOCATION******************//   
  23. // COMPONENT - BUTTON(s) aligned along X-axis.   
  24. const int BUTTON_LENGTH = 50;   
  25. const int BUTTON_HEIGHT = 20;   
  26. const int FIRSTBUTTON_XPOS = 20;   
  27. const int FIRSTBUTTON_YPOS =220;   
  28. const int XSPACING = 70; // (Note: XSPACING >= BUTTON_LENGTH)   
  29. const int YSPACING = 0;   
  30. //COMPONENT - MOVE BUTTONS   
  31. const int MBUTTON_LENGTH = 20;   
  32. const int MBUTTON_HEIGHT = 20;   
  33. const int FIRSTMBUTTON_XPOS = 220;   
  34. const int FIRSTMBUTTON_YPOS =70;   
  35. const int SECONDMBUTTON_XPOS = 220;   
  36. const int SECONDMBUTTON_YPOS =100;   
  37. // COMPONENT - LISTBOX   
  38. const int LISTBOX_LENGTH = 3*BUTTON_LENGTH;   
  39. const int LISTBOX_HEIGHT = 6*BUTTON_HEIGHT;   
  40. const int LISTBOX_XPOS = 50;   
  41. const int LISTBOX_YPOS = 50;   
  42. // COMPONENT - LABEL   
  43. const int LABEL_LENGTH = 50;   
  44. const int LABEL_HEIGHT = 50;   
  45. const int LABEL_XPOS = 20; // align it with first button   
  46. const int LABEL_YPOS = 173;   
  47. // COMPONENT - TEXTBOX   
  48. const int TEXTBOX_LENGTH = 120;   
  49. const int TEXTBOX_HEIGHT = 50;   
  50. const int TEXTBOX_XPOS = 70;   
  51. const int TEXTBOX_YPOS = 170;   
  52. public ListBox() : base()   
  53. {   
  54. InitializeComponent();   
  55. }   
  56. public override void Dispose()   
  57. {   
  58. base.Dispose();   
  59. container.Dispose();   
  60. }   
  61. private void InitializeComponent()   
  62. {
  63. // this   
  64. this.container = new System.ComponentModel.Container();   
  65. this.Text="List Box";   
  66. // buttonAdd   
  67. this.buttonAdd = new System.Windows.Forms.Button();   
  68. buttonAdd.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS,FIRSTBUTTON_YPOS);   
  69. buttonAdd.Text = "&Add";   
  70. buttonAdd.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
  71. buttonAdd.Click += new System.EventHandler(this.buttonAdd_Click); buttonAdd.Enabled = false;   
  72. this.Controls.Add(this.buttonAdd);   
  73. //buttonModify   
  74. this.buttonModify = new System.Windows.Forms.Button();   
  75. buttonModify.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+XSPACING,FIRSTBUTTON_YPOS+YSPACING);   
  76. buttonModify.Text = "&Modify";   
  77. buttonModify.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
  78. buttonModify.Click += new System.EventHandler(this.buttonModify_Click); buttonModify.Enabled = false;   
  79. this.Controls.Add(this.buttonModify);   
  80. //buttonDelete   
  81. this.buttonDelete = new System.Windows.Forms.Button();   
  82. buttonDelete.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+2*XSPACING,FIRSTBUTTON_YPOS+2*YSPACING); buttonDelete.Text = "&Delete";   
  83. buttonDelete.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
  84. buttonDelete.Enabled = false;   
  85. buttonDelete.Click += new System.EventHandler(this.buttonDelete_Click);   
  86. this.Controls.Add(this.buttonDelete);   
  87. // buttonClose   
  88. this.buttonClose = new System.Windows.Forms.Button();   
  89. buttonClose.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+3*XSPACING,FIRSTBUTTON_YPOS+3*YSPACING); buttonClose.Text = "&Close";   
  90. buttonClose.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
  91. buttonClose.Click += new System.EventHandler(this.buttonClose_Click);   
  92. this.Controls.Add(this.buttonClose);   
  93. // listbox   
  94. this.listbox = new System.Windows.Forms.ListBox();   
  95. listbox.Location = new System.Drawing.Point(LISTBOX_XPOS,LISTBOX_YPOS);   
  96. listbox.Size = new System.Drawing.Size(LISTBOX_LENGTH,LISTBOX_HEIGHT);   
  97. listbox.Click += new System.EventHandler(this.listbox_SelectedIndexChanged);   
  98. listbox.BackColor = (Color)System.Drawing.SystemColors.Desktop;   
  99. this.Controls.Add(this.listbox);   
  100. // label   
  101. this.label = new System.Windows.Forms.Label();   
  102. label.Location = new System.Drawing.Point(LABEL_XPOS,LABEL_YPOS);   
  103. label.Size = new System.Drawing.Size(LABEL_LENGTH,LABEL_HEIGHT);   
  104. label.Text = "Enter:";   
  105. this.Controls.Add(this.label);   
  106. // textbox   
  107. this.textbox = new System.Windows.Forms.TextBox();   
  108. textbox.Location = new System.Drawing.Point(TEXTBOX_XPOS,TEXTBOX_YPOS); textbox.Click += new System.EventHandler(this.textbox_Click);   
  109. textbox.Size = new System.Drawing.Size(TEXTBOX_LENGTH,TEXTBOX_HEIGHT);   
  110. this.Controls.Add(this.textbox);   
  111. // buttonMoveUp   
  112. this.buttonMoveUp = new System.Windows.Forms.Button();   
  113. buttonMoveUp.Location = new System.Drawing.Point(FIRSTMBUTTON_XPOS,FIRSTMBUTTON_YPOS);   
  114. buttonMoveUp.Text = "<";   
  115. buttonMoveUp.Size = new System.Drawing.Size(MBUTTON_LENGTH,MBUTTON_HEIGHT);   
  116. buttonMoveUp.Click += new System.EventHandler(this.buttonMoveUp_Click);   
  117. buttonMoveUp.Enabled = false;   
  118. this.Controls.Add(this.buttonMoveUp);   
  119. // buttonMoveDown   
  120. this.buttonMoveDown = new System.Windows.Forms.Button();   
  121. buttonMoveDown.Location = new System.Drawing.Point(SECONDMBUTTON_XPOS,SECONDMBUTTON_YPOS);   
  122. buttonMoveDown.Text = ">";   
  123. buttonMoveDown.Size = new System.Drawing.Size(MBUTTON_LENGTH,MBUTTON_HEIGHT);   
  124. buttonMoveDown.Click += new System.EventHandler(this.buttonMoveDown_Click);   
  125. buttonMoveDown.Enabled = false;
  126. this.Controls.Add(this.buttonMoveDown);   
  127. }
  128. protected void textbox_Click(Object sender, System.EventArgs e)   
  129. {   
  130. this.buttonAdd.Enabled = true;   
  131. if (this.listbox.Items.Count>0)   
  132. EnableAllListBoxButtons();   
  133. }   
  134. protected void listbox_SelectedIndexChanged(object sender, System.EventArgs e)
  135. {
  136. nSelectedIndex = this.listbox.SelectedIndex;   
  137. string szSelected = (string)this.listbox.SelectedItem;   
  138. this.textbox.Text = szSelected;   
  139. }   
  140. protected void buttonAdd_Click(Object sender, System.EventArgs e)   
  141. {   
  142. if (this.textbox.Text !="")   
  143. {
  144. this.listbox.Items.Add(this.textbox.Text);   
  145. this.textbox.Text = "";   
  146. EnableAllListBoxButtons();   
  147. }   
  148. }   
  149. protected void buttonModify_Click(Object sender, System.EventArgs e)   
  150. {   
  151. this.listbox.Items[nSelectedIndex] = this.textbox.Text;   
  152. }   
  153. protected void buttonDelete_Click(Object sender, System.EventArgs e)   
  154. {   
  155. nSelectedIndex = this.listbox.SelectedIndex;   
  156. this.listbox.Items.Remove(nSelectedIndex);   
  157. System.Console.WriteLine("Remove fn does not work...");   
  158. }   
  159. protected void buttonClose_Click(Object sender, System.EventArgs e)   
  160. {   
  161. this.Close();   
  162. }   
  163. protected void buttonMoveUp_Click(Object sender, System.EventArgs e)   
  164. {   
  165. if (this.listbox.SelectedIndex >0)   
  166. this.listbox.SelectedIndex--;   
  167. }   
  168. protected void buttonMoveDown_Click(Object sender, System.EventArgs e)   
  169. {   
  170. if (this.listbox.SelectedIndex < this.listbox.Items.Count-1)   
  171. this.listbox.SelectedIndex++;   
  172. }   
  173. private void EnableAllListBoxButtons()   
  174. {
  175. this.buttonAdd.Enabled = true;   
  176. this.buttonModify.Enabled = true;   
  177. this.buttonDelete.Enabled = true;   
  178. this.buttonMoveUp.Enabled = true;   
  179. this.buttonMoveDown.Enabled = true;   
  180. }   
  181. [STAThread]   
  182. public static void Main(string[] args)   
  183. {   
  184. Application.Run(new ListBox());   
  185. }   
  186. } // class   
  187. } // namespace

Kindly upvote please,

Thank you.

venereology answered 2 years ago
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