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Hi Gubber,
did you opened the file before? Maybe there is still an open stream or somthing like this on the file. Maybe you should try to dispose the stream before?
Regards
Sebastian
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Thanks!!
That was exactly it.. I had opened a stream and forgot to Dispose of it.
Cheers!
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Hi All,
I have made a class Words.....and m using an array of it.....and i want to sort this array according to its data member Term (it also has other data members). which is a string....wat is the easiest and effeiceint way of doing it plzz tell in detail
looking forward for help
Regards,
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See this article.
You need to implement the IComparable interface and add a function CompareTo to your class.
regards
modified 12-Sep-18 21:01pm.
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Hi Sir,
Well the article u have suggested is quite complex coz i think it is about sorting objects of different classes.....i just need to sort object of a single class on the base of a specific data member........isnt there any easy way to do this 
Looking forward for help
Regards,
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You should also have read his second sentence. Here a little example:
public class MyClass : IComparable {
private string _myValue;
public int CompareTo(object o) {
return _myValue.CompareTo(((MyClass)o)._myValue);
}
}
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how can i call this in my class? and wat is the purpose of this _myValue variable.
looking forward for help
Regards,
-- modified at 11:59 Tuesday 23rd May, 2006
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Ok some more details  :
MyClass is the class you want to get sorted.
_myValue is the field or whatever by which you want to sort the data. Instead of using a field you could also use a property or something else.
Now assuming you have filled instances of this class into an ArrayList you can sort it with:
list.Sort();
If you have an array (MyClass[] myArray) of your object than you can sort it with:
Array.Sort(myArray);
Internally the Sort methods will call CompareTo to determine the correct ordering.
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Hi Sir,
i am trying to do this in this way
public class TextMiner : System.Windows.Forms.Form , IComparable
{
public Terminology[] word = new Terminology[WORDS];
private string strValue = "term";
public int CompareTo(object obj)
{
Terminology w = (Terminology) obj;
return( strValue.CompareTo( w.term ));
}
public void Indexer()
{
Aray.Sort(word);
}
}
it compiles without any error but it throws this exception during execution
An unhandled exception of type 'System.InvalidOperationException' occurred in mscorlib.dll
Additional information: Specified IComparer threw an exception.
tell me what i m doing wrong and how i can correct it....
looking forward for help
Regards,
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As you sort a Terminology array also the Terminology class should implement IComparable and not the Form.
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sir it also didnt work  i ve written the same code in the CompareTo function which i ve written in TextMiner class but it made no difference again same exception
is there any way out of this ??
looking forward for help
Regards,
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I assume some error is thrown within your CompareTo method. You should probably check if the are null values within your array or probably if sometimes term is null.
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well the exception doesnt come during sorting it comes after the sorting the statement i m cofused about is the use of
private string strValue = "term";
isnt there any error in this statement?? i mean term is the variable of terminology class and i m declaring it as a string value in TextMiner class how will this work??
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Could you please post the important part of the Terminology class and the Sort call you are currently doing? Maybe I can help you then.
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public class Terminology : IComparable
{
private string term;
private int df;
private int qTf;
private double qWeight;
private ArrayList tf = new ArrayList();
private ArrayList position= new ArrayList();
private ArrayList docID= new ArrayList();
private static int Count;
public int CompareTo(object obj)
{
Terminology w = (Terminology) obj;
return( w.term.CompareTo( w.term ));
}
public void incDF()
{
df++;
}
}
now moving to TextMiner class
public class TextMiner : System.Windows.Forms.Form , IComparable
{
const int WORDS = 20000;
public Terminology[] word = new Terminology[WORDS];
public void Indexer()
{
Array.Sort(word);
}
private string strValue = "term";
public int CompareTo(object obj)
{
Terminology w = (Terminology) obj;
return( strValue.CompareTo( w.term ));
}
}
it gives this exception
An unhandled exception of type 'System.NullReferenceException' occurred in 2ndAssignment.exe
Additional information: Object reference not set to an instance of an object.
and on this statement
for(int j = 0; j < Terminology.count-1; j++)
{
sw.Write(j+1 +"\t"+word[j].term.PadRight(20,' '));
}
and the exceptions comes when the value of j is 0....m really confused
looking forward for help
Regards,
-- modified at 5:43 Wednesday 24th May, 2006
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Several things:
1. In the first snippet the CompareTo should look like the following:
public int CompareTo(object obj)
{
Terminology w = (Terminology) obj;
return( this.term.CompareTo( w.term ));
}
In your implementation you compared w.term with itself.
2. The following part isn't needed (as far as I can see from your snippets):
private string strValue = "term";
public int CompareTo(object obj)
{
Terminology w = (Terminology) obj;
return( strValue.CompareTo( w.term ));
}
}
3. If you are getting such an error when j is 0 than my previous assumption that there are null values in your array seems right. The first element of the word array seems to be null.
You could verify this for example with the following code:
for(int j = 0; j < Terminology.count-1; j++)
{
if (word[j] == null)
MessageBox.Show("word array at index " + j + " is null");
else if (word[j].term == null)
MessageBox.Show("term property in word array at index " + j + " is null");
sw.Write(j+1 +"\t"+word[j].term.PadRight(20,' '));
}
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Robert Rohde wrote: if (word[j] == null) MessageBox.Show("word array at index " + j + " is null");
Sir it is showing entire array of word as null.....but it works perfectly fine without sorting..........how can all the values changed to null??
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using System;
using System.Collections;
namespace Test {
public class Word {
private string value;
private string anothervalue;
public string Value {
get { return value; }
set { value = value; }
}
public string AnotherValue {
get { return anothervalue; }
set { anothervalue = value; }
}
}
public class WordComparer : IComparer {
public int Compare(object x, object y) {
Word w1 = x as Word;
Word w2 = y as Word;
if (w1 == null || w2 == null) { return 0; }
return w1.Value.CompareTo(w2.Word);
}
}
public class Application {
public Word[] Sort(Word[] words) {
return Array.Sort(words, new WordComparer());
}
}
}
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Hi Sir,
when i am trying to do this in this way
public class WordComparer : IComparer
{
public int Compare(object x, object y)
{
Terminology w1 = x as Terminology;
Terminology w2 = y as Terminology;
if (w1 == null || w2 == null) { return 0; }
return w1.term.CompareTo(w2.term);
}
}
public class TextMiner : System.Windows.Forms.Form
{
some code here........
public Terminology[] word = new Terminology[WORDS];
public void Indexer()
{
Array.Sort(word, new WordComparer());
}
}
well it compiles fine but when i try to access the objects of that sorted class it gives null object reference exception
for(int i = 0; i < Terminology.Count; i ++)
{
do something with word[i];
}
well this exception comes when the value of i is 0......and the program was working perfectly fine b4 that.....
Looking forward for help
Regards,
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I can't say much about the exception without seeing how you're setting up the arrays... But from your code snippet above, Array.Sort returns a new array. Try:
public class TextMiner : System.Windows.Forms.Form {
public Terminology[] word = new Terminology[WORDS];
public void Indexer() {
word = Array.Sort(word, new WordComparer());
}
}
Visit BoneSoft.com
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BoneSoft wrote: Array.Sort returns a new array
No it doesn't - it sorts the existing instance
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BoneSoft wrote: word = Array.Sort(word, new WordComparer());
well i ve tried this already but it gives compile time error that cant covert type void to type TextMiner.Terminology[]
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Hi howzit?
I need to find a component or sample code that interacts with Novell Groupwise email client. If its in C# that would be great.
I need to beable to import Novell's address book list and also send email with attachments programatically.
Cheers
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I set ListView.ShowGroups=TRUE but i couldnt see the groups on listview at Windows 98 client
W H Y ?
H
Y
?
-- modified at 5:22 Tuesday 23rd May, 2006
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