String.TrimStart Method

Parameters

• trimChars
  Type: array<System.Char[]
  An array of Unicode characters to remove or nulla null reference (Nothing in Visual Basic).

Return Value

Type: System.String
The string that remains after all occurrences of characters in the trimChars parameter are removed from the start of the current string. If trimChars is nulla null reference (Nothing in Visual Basic) or an empty array, white-space characters are removed instead.

Public Shared Function StripComments(ByVal lines() As String) As String()
   Dim lineList As New List(Of String)
   For Each line As String In lines
      If line.TrimStart(" "c).StartsWith("'") Then
         lineList.Add(line.TrimStart("'"c, " "c))
      End If
   Next
   Return lineList.ToArray()
End Function

public static string[] StripComments(string[] lines)
{
   List<string> lineList = new List<string>();
   foreach (string line in lines)
   {
      if (line.TrimStart(' ').StartsWith("//"))
         lineList.Add(line.TrimStart(' ', '/'));
   }
   return lineList.ToArray();
}

Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
   Dim lines() As String = {"Public Module HelloWorld", _
                            "   Public Sub Main()", _
                            "      ' This code displays a simple greeting", _
                            "      '.", _
                            "      outputBlock.Text += String.Format(""Hello, World."") & vbCrLf", _
                            "   End Sub", _
                            " End Module"}
   outputBlock.Text &= "Code before call to StripComments:" & vbCrLf
   For Each line As String In lines
      outputBlock.Text += String.Format("   {0}", line) & vbCrLf
   Next

   Dim strippedLines() As String = StripComments(lines)
   outputBlock.Text &= "Code after call to StripComments:" & vbCrLf
   For Each line As String In strippedLines
      outputBlock.Text += String.Format("   {0}", line) & vbCrLf
   Next
End Sub
' This code produces the following output:
'    Code before call to StripComments:
'       Public Module HelloWorld
'          Public Sub Main()
'             ' This code displays a simple greeting
'             '.
'             Console.WriteLine("Hello, World.")
'          End Sub
'       End Module
'       This code displays a simple greeting
'      .   

public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
   string[] lines = {"using System;",
                    "", 
                    "public class HelloWorld",
                    "{", 
                    "   public static void Main()",
                    "   {", 
                    "      // This code displays a simple greeting", 
                    "      //.", 
                    "      outputBlock.Text += String.Format(\"Hello, World.\")", 
                    "   }", 
                    "}"};
   outputBlock.Text += "Before call to StripComments:" + "\n";
   foreach (string line in lines)
      outputBlock.Text += String.Format("   {0}", line) + "\n";

   string[] strippedLines = StripComments(lines);
   outputBlock.Text += "After call to StripComments:" + "\n";
   foreach (string line in strippedLines)
      outputBlock.Text += String.Format("   {0}", line) + "\n";
}
// This code produces the following output:
//    Before call to StripComments:
//       using System;
//   
//       public class HelloWorld
//       {
//           public static void Main()
//           {
//               // This code displays a simple greeting
//               //.
//               Console.WriteLine("Hello, World.");
//           }
//       }  
//    After call to StripComments:
//       This code displays a simple greeting
//      .