qr code in c# End Property 47. // Visual C# 48. /// <summary> in VS .NET

Create QR Code in VS .NET End Property 47. // Visual C# 48. /// <summary>

46. End Property 47. // Visual C# 48. /// <summary>
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49. /// Lines of code in the source file, excluding blank and comment li nes. 50. /// </summary>public int LinesOfCode { 51. get { return m_linesOfCode; } 52. } Your next step depends on the language you re using. If you re using Visual Basic, you can create the Classes property, which takes an integer parameter to select one of the class names. If you re using Visual C#, you need to create the GetClass method. Create the Classes property (Visual Basic only) Add the Classes property: Visual Basic Public ReadOnly Property Classes(ByVal index As Integer) As Str ing Get If index < m_classCount Then Return m_classNames(index) Else Throw New System.IndexOutOfRangeException( _ "There are only " & m_classCount & " classes defined." ) End If End Get End Property The syntax for this property is the same as for any other property, with the addition of the index parameter. If you wanted this property to be read-write, you would remove the ReadOnly modifier and add a Set block as shown in the next code snippet. Notice that the Set block has two local variables, index and value, instead of just one, index. Visual Basic Remove the ReadOnly property modifier, and add this Set block. Set(ByVal Value As String) If index < m_classCount Then m_classNames(index) = Value Else Throw New System.IndexOutOfRangeException( _ "There are only " & m_classCount & " classes defined.") End If End Set Create the GetClass method (Visual C# only) Add the GetClass method: // Visual C# /// <summary> /// Returns one of the names of the classes defined in the /// source file, based on an index. /// </summary>/// <param name="index">A zerobased index</param> /// <returns>A class name</returns>public string GetClass(int ind ex) { if (index < m_classCount) { return m_classNames[index]; } else {
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throw new System.IndexOutOfRangeException("There are o + m_classCount + " classes defined."); }
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This code also shows more of the documentation tags available for C# code. With the properties and methods complete, you can now move on to creating the constructor. Create the constructor Most of the work of the SourceFile class is accomplished here. The class constructor sets the data fields. 1. In the Class Name drop-down list, click SourceFile if it isn t already selected. 2. In the Method Name drop-down list, click New if you re working with a Visual Basic project, or click SourceFile if you re working with a Visual C# project. This action adds a parameterless constructor to the class. (For Visual C#, the constructor was created when you added the class through the Add New Item dialog box.) 3. Add a string parameter, fullPath, to the constructor as shown. 4. 5. 6. 7. 8. 9. 10. 11. 12. Visual Basic Public Sub New(ByVal fullPath As String) End Sub // Visual C# public SourceFile(string fullPath) { // // TODO: Add constructor logic here //
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} 13. Add code for the constructor, as shown here: 14. Visual Basic 15. Public Sub New(ByVal fullPath As String) 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. m_classCount = 0 m_linesOfCode = 0 m_fullPath = fullPath m_classNames = New String(10) {} Try Dim reader As New System.IO.StreamReader(m_fullPath) Dim nameStart As Integer Dim oneline As String oneline = reader.ReadLine() While (Not (oneline Is Nothing)) oneline = oneline.Trim() Don t count blank lines and comment lines. If ((oneline <> "") And (Not oneline.StartsWith(" "))) Then
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29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47.
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m_linesOfCode += 1 End If If (oneline.StartsWith("Public Class")) Then nameStart = oneline.IndexOf("Class") + 6 Dim names() As String Dim separators() As Char = {ControlChars.Tab, " "c} names = oneline.Substring( _ nameStart).Trim().Split(separators) Dim className As String = names(0).Trim() m_classNames(m_classCount) = className m_classCount += 1 End If oneline = reader.ReadLine() End While reader. Close() Catch ex As System.Exception Throw New System.Exception( _ "Problems parsing source file: " + ex.Message) End Try
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48. End Sub 49. // Visual C# 50. public SourceFile(string fullPath){ 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. ); 69. string className = names[0].Trim(); m_linesOfCode = 0; m_classNames = new string[10]; m_classCount = 0; m_fullPath = fullPath; try { System.IO.StreamReader reader = new System.IO.StreamReader(m_fullPath); int nameStart; string oneline; while ((oneline = reader.ReadLine()) != null) { oneline = oneline.Trim(); // Don t count blank or comment lines. if ((oneline != "") && (!oneline.StartsWith("\\"))) { m_linesOfCode++; } if (oneline.StartsWith("public class")) { nameStart = oneline.IndexOf("class") + 6; char[] separators = { , \t , { }; string[] names = oneline.Substring(nameStart).Trim().Split(separators
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70. 71. 72. 73. 74. 75. " 76. 77. } } } }
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m_classNames[m_classCount++] = className;
reader.Close(); catch (System.Exception ex) { throw new System.Exception("Problems parsing source file: + ex.Message);
} The first thing the constructor does is initialize all the instance data. The syntax for the array initialization creates an array of references that are all Nothing or null. The While loop reads one line from the file, using a StreamReader object. The StreamReader.ReadLine method returns Nothing or null at the end of the file. In C#, the assignment statement, oneline = reader.ReadLine(), returns the value of oneline, which can be tested directly in the while statement. In Visual Basic, the similar syntax would be interpreted as an equality test of oneline and reader.ReadLine(). So the test for null in the While statement isn t possible in Visual Basic. Each line is tested to determine whether it starts with Public Class or public class, depending on language. This process is a simple way to find class declarations, but it s not exhaustive because other modifiers might precede the class keyword. To find the class name, the code looks for the next word after the word class, using the Split method. The line names = oneline.Substring(nameStart).Trim().Split(separators) is an example of chaining method calls. Each method returns a string, so you can then call a string method on the result. How many methods you chain in one statement depends on the readability of the code. With the properties, methods, and constructors defined, the SourceFile class is complete. You can now add the client code to Form1. Adding Code to the User Interface The Form1_Load event is used to initialize the controls on the form. The Browse button allows the user to select one file for analysis. The Display button displays the classes contained in a selected source file. Program the Form1_Load method 1. Add an array for the SourceFile instances as a field of the Form1 class. 2. Visual Basic 3. Private Const MaxFiles As Integer = 10 4. Private m_sourceFiles(MaxFiles) As SourceFile 5. Private m_files As Integer = 0 6. // Visual C# 7. private const int MaxFiles = 10; 8. private SourceFile[] m_sourceFiles = new SourceFile[MaxFiles]; private int m_files = 0; This particular syntax for declaring an array creates an array of 10 references to SourceFile instances and sets each instance to Nothing or null, depending on the language. 9. In the form designer, double-click Form1 and then add this code to the Form1_Load event to set the data source of the DataGrid. 10. 11. Visual Basic Private Sub Form1_Load(ByVal sender As Object, _
12. 13. 14. 15.
ByVal e As System.EventArgs) Handles MyBase.Load listOfFiles.DataSource = m_sourceFiles End Sub // Visual C#
16. 17. }
private void Form1_Load(object sender, System.EventArgs e) { listOfFiles.DataSource = m_sourceFiles;
When the application starts, 10 blank rows will be displayed in the DataGrid. Now you ll add code to the Click event method for the Browse button to replace those rows with data. Program the Browse button The Browse button prompts the user to specify a source file and adds a row to the DataGrid control with the results of the file analysis. 1. In the form designer, double-click the Browse button to create the browse_Click method. 2. Add the following code to the browse_Click method: 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 22. // Visual C# 23. private void browse_Click(object sender, System.EventArgs e) { 24. 25. 26. 27. 28. try { openSourceFile.Filter = "Visual C# files (*.cs)|*.cs"; System.Windows.Forms.DialogResult result; result = openSourceFile.ShowDialog(); if (result == System.Windows.Forms.DialogResult.OK) { Visual Basic Private Sub browse_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles browse.Click Try openSourceFile.Filter = "Visual Basic files (*.vb)|*.vb" Dim result As System.Windows.Forms.DialogResult result = openSourceFile.ShowDialog() If (result = DialogResult.OK) Then Dim aFile As New SourceFile(openSourceFile.FileName) m_sourceFiles(m_files) = aFile m_files += 1 If (m_files = m_sourceFiles.Length) Then m_files = m_sourceFiles.Length - 1 End If listOfFiles.Refresh() Catch ex As System.Exception MessageBox.Show(ex.Message) End Try End If
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