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non-dictionary string

Posted on 2014-10-21
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Last Modified: 2014-11-18
Hi Dear,

Could you please help me how to check the string is dictionary word or non-dictionary word ?



thanks
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Question by:mannevenu26
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7 Comments
 
LVL 16

Expert Comment

by:Kamal Khaleefa
ID: 40394171
THE QUESTION IS NOT CLEAR

IF YOU HAVE A DATABASE AND WANT TO CHECK IF A WORD EXIST IN SOME TABLE YOU CAN DO A SELECT QUERY

AND SEARCH FOR IT
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LVL 44

Accepted Solution

by:
AndyAinscow earned 1500 total points
ID: 40394187
Look at the following, they seem to be what you are asking for.
http://msdn.microsoft.com/en-us/library/bb347013%28v=vs.110%29.aspx
and
http://msdn.microsoft.com/en-us/library/kw5aaea4%28v=vs.110%29.aspx

You haven't specified if the string is a key or a value - dictionaries store two parts for each entry.


ps.
@king2002 - the question is about a dictionary, not a database.
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LVL 83

Expert Comment

by:David Johnson, CD, MVP
ID: 40394198
the way the question is worded it could also be a search to see if the word (string) exists in say the oxford dictionary as in the method to disallow dictionary words in a password
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LVL 35

Expert Comment

by:sarabande
ID: 40394232
how to check the string is dictionary word or non-dictionary word ?
I would agree with the ContainsKey suggestion Andy Ainscow has posted.

if  (!myDict.ContainsKey(myString))
{
     // ...

Open in new window

what is the recommended solution if looking for string keys in a c# dictionary container.

if looking for "words" in a dictionary, you rarely will look for the value part but for keys only.

Sara
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LVL 34

Expert Comment

by:it_saige
ID: 40394525
@sara - You mean something like this:
using System;
using System.Collections.Generic;
using System.Linq;

static class DictionaryExample
{
	public static void Main()
	{
		Dictionary<string, string> dictionary = new Dictionary<string, string>();
		dictionary.Add("Apple", "This is the definition of an apple.");
		dictionary.Add("Banana", "This is the definition of a banana.");
		dictionary.Add("Cherry", "This is the definition of a cherry.");
		dictionary.Add("Grape", "This is the definition of a grape.");
		dictionary.Add("Lemon", "This is the definition of a lemon.");
		dictionary.Add("Orange", "This is the definition of an orange.");
		dictionary.Add("Pear", "This is the definition of a pear.");
		string[] lookups = new string[] { "Apple", "Pear", "Banana" };
		var definitions = (from pair in dictionary 
					    from lookup in lookups
					    where pair.Key.Equals(lookup, StringComparison.InvariantCultureIgnoreCase)
					    select pair);

		foreach (var pair in definitions)
			Console.WriteLine(string.Format("{0} - {1}", pair.Key, pair.Value));
		Console.ReadLine();
	}
}

Open in new window

Produces the following output:Capture.JPG
-saige-
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LVL 44

Expert Comment

by:AndyAinscow
ID: 40394627
This is a copy/paste of code from the links I posted initially:

// ContainsKey can be used to test keys before inserting  
// them. 
if (!openWith.ContainsKey("ht"))
{
    openWith.Add("ht", "hypertrm.exe");
    Console.WriteLine("Value added for key = \"ht\": {0}", 
        openWith["ht"]);
}


...


// When a program often has to try keys that turn out not to 
// be in the dictionary, TryGetValue can be a more efficient  
// way to retrieve values. 
string value = "";
if (openWith.TryGetValue("tif", out value))
{
    Console.WriteLine("For key = \"tif\", value = {0}.", value);
}
else
{
    Console.WriteLine("Key = \"tif\" is not found.");
}

Open in new window


which demonstrates both of the methods detailed in the two links.  Namely how to test if a string (key) is in a dictionary collection.
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LVL 40
ID: 40395064
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