VB.NET ASP.NET Filter() Source Code Syntax Example

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Filter Example Syntax VB.NET ASP.NET | Filter | Source Code

Summary: – Illustrates using with in VB.NET ASP.NET.


 *** 1. Download Source Code *** 

VB.NET Syntax StringManipulation Filter download Download Source Code for All VB ASP.NET Examples in One Project – source code for hundreds of VB.NET ASP.NET examples neatly organized in a single project.


 *** 2. Filter Syntax *** 


Purpose:
Returns a zero-based array containing a subset of a String array based on
specified filter criteria.


Syntax:
Filter (Source As String(), Match As String, Include As Boolean, _
Compare As CompareMethod) As String()

Parameters Description
Source Required – one-dimensional string array to be searched
Match required – string to search for
Include optional – Boolean value indicating whether to return substrings that
include or exclude Match.
Compare optional – numeric value indicating compare method – CompareMethod.Binary
or CompareMethod.Text

Result Data Type Description
array Returns a zero-based array containing a subset of a String array based on
specified filter criteria.



 *** 3. Filter – Quick Example *** 

Dim myStrings(3) As String
myStrings(0) = "This"
myStrings(1) = "is"
myStrings(2) = "my"
myStrings(3) = "string"


 *** 4. Filter – Full Example *** 

Filter Example Output Screenshot


VB.NET Syntax StringManipulation Filter screenshot


Step 1: Click on Visual Basic to Cut-n-paste code into Filter.aspx.vb
 Visual Basic |  copy code |? 
Imports System
Imports System.IO
Imports System.Data
 
 
' This example is from http://idealprogrammer.com
' It shows how you can use Filter syntax in VB.NET ASP.NET
'****************************************************************************************
' Purpose: Returns a zero-based array containing a subset of a String array based on
' specified filter criteria.
'
' Syntax: 	Filter (Source As String(), Match As String, Include As Boolean, _
' Compare As CompareMethod) As String()
'
' Parameter1: Source - Required - one-dimensional string array to be searched 
'
' Parameter2: Match - required - string to search for
'
' Parameter3: Include - optional - Boolean value indicating whether to return substrings that 
' include or exclude Match.
'
' Parameter4: Compare - optional - numeric value indicating compare method - CompareMethod.Binary
' or CompareMethod.Text
'
' Result: array - Returns a zero-based array containing a subset of a String array based on
' specified filter criteria.
'
' Quick Example:  Dim myStrings(3) As String
'        myStrings(0) = "This"
'        myStrings(1) = "is"
'        myStrings(2) = "my"
'        myStrings(3) = "string"
 
'        Dim FilteredStrings() As String
'        FilteredStrings = Microsoft.VisualBasic.Filter(myStrings, "is", True, CompareMethod.Text)
'        Dim sb As New StringBuilder
'        For Each myItem As String In FilteredStrings
'            sb.Append(myItem + "<br />") ' Returns ["This", "Is"].
'        Next
'        TextBox1.Text = sb.ToString()
'
' *********************************************************
Partial Class _Filter
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Label1.Text = "Example #1: 	Filter(Source, Match, Include,Compare) As String"
        Dim myStrings(3) As String
        myStrings(0) = "This"
        myStrings(1) = "is"
        myStrings(2) = "my"
        myStrings(3) = "string"
 
        Dim FilteredStrings() As String
        FilteredStrings = Microsoft.VisualBasic.Filter(myStrings, "is", True, CompareMethod.Text)
        Dim sb As New StringBuilder
        For Each myItem As String In FilteredStrings
            sb.Append(myItem + "<br />") ' Returns ["This", "Is"].
        Next
        TextBox1.Text = sb.ToString()
    End Sub
 
End Class


Step 2: Click on XML to Cut-n-paste code into Filter.aspx
 XML |  copy code |? 
< %@ Page Language="VB" AutoEventWireup="false" CodeFile="Filter.aspx.vb" Inherits="_Filter" %>
 
< !DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h1><asp:label ID="Label1" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox1" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label2" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox2" runat="server"></asp:textbox><br />
          <h1><asp:label ID="Label3" runat="server" Text="Label"></asp:label> </h1>
         <asp:textbox ID="TextBox3" runat="server"></asp:textbox><br />
 
 
 
    </div>
    </form>
</body>
</html>
 
 


Prerequistes:

  1. Install Visual Web Developer 2010
  2. Install SQL Server Express
  3. Download Northwind and Pubs Databases
  4. Attach Northwind Database to Databases in Sql Express
  5. Attach pubs Database to Databases in Sql Express

Notes:

  • You can build your own library of syntax examples by using same web site over and over and just add new web forms to it.

Instructions:

VB.NET ASP.NET Syntax StringManipulation Filter
  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select Visual Basic for Language
    • name of Web Site could be VBNET_ASPNET_Syntax.
  3. Add New folder named "StringManipulation"
    • Right-click project name in solution explorer;
    • add new folder;
    • name of folder could be: StringManipulation
  4. Add Web Form Named Filter to StringManipulation folder
    • Right-click StringManipulation folder;
    • add new item;
    • Select Web Form
    • Check place code behind in separate file
    • Web Form name could be Filter
  5. Click on Visual Basic in step 1 at the top of this page to copy code into code-behind Filter.aspx.vb
  6. Click on XML in step 2 above to copy code into web form Filter.aspx
  7. Right-click on Filter.aspx in solution explorer and select view in browser

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