C-Sharp Filter Syntax Example | ASP.NET C# String Method | Source Code

Posted by on Thursday, March 31, 2011 · Leave a Comment 

C-Sharp Filter Syntax Example | ASP.NET C# String Method | Source Code

Purpose: – Here is a that illustrates the .


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Step 1: Click on C# to Cut-n-paste code into Filter.aspx.cs

using System;
using System.IO;
using System.Data;
using System.Text;
 
 
 
 
// This example is from http://idealprogrammer.com
// It shows how you can use Filter syntax in C-Sharp 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()
//
// 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
//****************************************************************************************
 
 
public partial class StringManipulation_Filter : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Label1.Text = "Example #1: 	Filter(Source, Match, Include,Compare) As String";
        string[] myStrings = new string[4];
        myStrings[0] = "This";
        myStrings[1] = "is";
        myStrings[2] = "my";
        myStrings[3] = "string";
 
        string[] FilteredStrings = null;
        FilteredStrings = Microsoft.VisualBasic.Strings.Filter(myStrings, "is", true, Microsoft.VisualBasic.CompareMethod.Text);
        StringBuilder sb = new StringBuilder();
        foreach (string myItem in FilteredStrings)
        {
            sb.Append(myItem + "<br />"); // Returns ["This", "Is"].
        }
        Label2.Text = sb.ToString();
 
    }
}

Step 2: Click on XML to Cut-n-paste code into Filter.aspx

< %@ Page Language="C#" AutoEventWireup="true" CodeFile="Filter.aspx.cs" Inherits="StringManipulation_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:label ID="Label2" runat="server" Text="Label"></asp:label>
    </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:
CS Syntax String Manipulation Filter

  1. Use Visual Web Developer 2010
  2. Create new web site;
    • Click File/New Web Site
    • Select ASP.NET Website Template
    • Select C-Sharp for Language
    • name of Web Site could be CSharp_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 C-Sharp in step 1 at the top of this page to copy code into web form Filter.aspx
  6. Click on XML in step 2 above to copy code into code-behind Filter.aspx.cs
  7. Right-click on Filter.aspx in solution explorer and select view in browser

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