C# Filter Example | Filter | Source Code
C# Filter Example | Filter | Source Code
Purpose: – Illustrates the C# Syntax for Filter.
Step 1: Click on C# to Cut-n-paste code into clsFilter.cs
using System; public class clsFilter { public void Main() { //**************************************************************************************** // 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 //**************************************************************************************** Console.WriteLine("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); foreach (string myItem in FilteredStrings) { Console.WriteLine(myItem); // Returns ["This", "Is"]. } //write blank line to make output easier to read Console.WriteLine(); //Prevent console from closing before you press enter Console.ReadLine(); } } |
Step 2: Click on C# to Cut-n-paste code into Program.cs
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace CSharp_Syntax { class Program { static void Main(string[] args) { clsFilter myFilter = new clsFilter(); myFilter.Main(); } } } |
Prerequistes:
- Install C# (Express or Standard Edition)
- Install SQL Server Express
- Download Northwind and pubs Database
- Attach Northwind Database to Databases in Sql Express
- Attach pubs Database to Databases in Sql Express
Notes:
- Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
- You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Program.cs
Instructions:
- Use C# 2010 Express or Standard Edition
- Create new project;
- Click File/New Project
- Select Console Application Template
- Select C# for Language
- name of project could be CSharp_Syntax.
- Add New folder named “StringManipulation”
- Right-click project name in solution explorer;
- add new folder;
- name of folder could be: StringManipulation
- Add Class Named clsFilter to StringManipulation folder
- Right-click StringManipulation folder;
- add new item;
- Select class
- Class name could be clsFilter
- Click on C# in code in step 1 at top of page to copy code into clsFilter.cs
- Click on C# in step 2 at top of page to copy code into Program.cs
- Click green arrow or press F5 to run program