The techniques needed in constructing search engine are regular expression, Linq, Generic, C#, sort and ranking algorithm.
Here is the code:
using System;
using System.Collections.Generic;
using
System.Text;
using System.Text.RegularExpressions;
using
System.Query;
namespace search
{
public class Search
{
private
List_SearchRelevance = new
List();
public List
SearchRelevence
{
get
{
return
_SearchRelevance;
}
}
private List_Results =
new List();
public List
Results
{
get
{
return
_Results;
}
}
public Search(string input, string[]
text)
{
for (int i = 0; i < text.Length; i++)
{
SearchRelevance
sr = new SearchRelevance(input,
text[i]);
sr.Calculate();
_SearchRelevance.Add(sr);
}
Sort();
}
private
void Sort()
{
var relevences =
from w in _SearchRelevance
orderby
w.RelevancePoint descending
select w;
foreach (SearchRelevance sri in
relevences)
{
_Results.Add(sri);
}
}
}
public class
SearchRelevance
{
public SearchRelevance(string input, string
text)
{
_OriginalText = text;
_UserInput = input;
}
public
override string ToString()
{
return _RelevancePoint.ToString() +" "+
_OriginalText ;
}
internal void Calculate()
{
string[] splitedinput
= UserInput.Split(new char[] { ' ' });
Dictionary
relevency = new Dictionary();
//initialize the relevency
dic.
for (int i = 0; i < splitedinput.Length;
i++)
{
relevency.Add(splitedinput[i], 0);
}
for (int i = 0; i <
splitedinput.Length; i++)
{
Regex reg = new Regex(splitedinput[i],
RegexOptions.IgnoreCase);
if (reg.IsMatch(OriginalText))
{
int
point;
relevency.TryGetValue(splitedinput[i], out
point);
relevency.Remove(splitedinput[i]);
relevency.Add(splitedinput[i],
++point);
}
}
_Relevancy = relevency;
//sum the relevency
int
rpoint = 0;
foreach (KeyValuePairkv in
relevency)
{
rpoint += kv.Value;
}
_RelevancePoint =
rpoint;
}
private string _UserInput;
public string
UserInput
{
get
{
return _UserInput;
}
}
private string
_OriginalText;
public string OriginalText
{
get
{
return
_OriginalText;
}
}
private int _RelevancePoint;
public int
RelevancePoint
{
get
{
return _RelevancePoint;
}
}
private
Dictionary_Relevancy = new Dictionary int>();
public Dictionary
Relevancy
{
get
{
return _Relevancy;
}
}
}
public class
Program
{
static void Main(string[] args)
{
string[] sb = new
string[4];
sb[0] = "Relevance cassida shell theory may be seen as an
attempt";
sb[1] = "registered by NSF (Class H1) cassida for use
where";
sb[2] = "Shell Cassida Silicone Fluid is";
sb[3] = "to work out in
detail one of Grice’s central claims";
string input = "nsf shell central h1
sillicone fluid";
Search sr = new Search(input, sb);
SearchRelevance[] res
= sr.Results.ToArray();
}
}
}
12 comments:
Dear Owen,
I am evaluating the elearning project you have build. I am very new to ASP.NET....Try to install the VAUL in my system according to your Installation instruction.
But could not able to find the "VUdatabase.sql"...is it possible to provide the database structure....Please let me know.
Waiting for your favourable reply.
Thanks
Regards
Uddipta
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