C# ArrayList !!!!

[newkhan]

HI,
I have created an array of ArrayList.
ArrayList arraylist=new ArrayList[7];
and them assin them the space
for( int index=0; index<arraylist .Length; index++ )
{
arraylist[ index ] = new ArrayList();
}
THen I save some values in it. Now I want to access index number 3 of arraylist[2] and for this purpose i have use the syntax
str=(( String )values[ g ].Item( j ).ToString());
but it gives the following error
'System.Collect ions.ArrayList' does not contain a definition for 'Item'

Kindly guide me in a right way

[Shashi Sadasivan]

Could you also post an example of how you are storing values into it.
that might be the key.
cheers

[newkhan]

Could you also post an example of how you are storing values into it.
that might be the key.
cheers

I have use the code as under to store values in arraylist as under
for(int b=0;b<col_count ;b++)
{
name=typ2[b].ToString(); // typ2 is another array which is working well
if (name.Equals("S tring")||name.E quals("VARCHAR" )||name.Equals( "CHAR")||name.E quals("Text"))
{
string pick="ab "; // ab can be any string that should be added on arraylist
values[b].Add(pick);
}

Now I am reading values from arraylist as under
if(strsql.Equal s("VARCHAR(100) "))
{
string str=(( String )values[ g ].Item( j ));
}

In java I have done the same thing with follwing
string str=(( String )values[ g ].get( j ));
and it doesn't give me any error.

But in case of C# it gives message that "arraylist has no definition of Item"

Please guide me in a right way I am very disturbed due to this problem.

[r035198x]

Wasn't your array declaration supposed to be

[CODE=css]ArrayList[] list = new ArrayList[7];[/CODE]

[Plater]

Well that would be correct. ArrayLists don't have a property called "item"

declaration:

ArrayList[] mylist = new ArrayList[7];
for (int i=0;i<mylist.Length;i++)
{
   mylist[i]=new ArrayList();
}

usage:

//this will look at the arraylist at index "2" of the regular array
//and return the object stored at index "3" in that arraylist
object o=((ArrayList)mylist[2])[3];

[Shashi Sadasivan]

Yep, Plater is right about that one.

If you dont want to go through the trouble of typecasting, you can use a List<T>

cheers

[newkhan]

Thanks to all people who reply me and help me to solve my problem.
I Found the solution. Again thanks. This site is really helpful for sincere people.

[newkhan]

C# ArrayList Problem Again !!!!

Hi ,

I use the c# code to store and extract values from the arraylist as under[code=cpp]
ArrayList[] values=new ArrayList[col_count];
for( int index=0; index<col_count ; index++ )
{
values[ index ] = new ArrayList();
}
After assignning the space I started to store the sql table values in the list like

for(int a=0;a<tab_lenth ;a++)

{
for(int b=0;b<col_count ;b++)
{
name=typ2[b].ToString();
NOTE: type2 is another single arraylist and it works fine.
if (name.Equals("S tring")||name.E quals("VARCHAR" )||name.Equals( "CHAR")||name.E quals("Text"))
{
string pick="";
pick=data.Rows[a][b].ToString();

values[b].Add(pick);

richTextBox1.Te xt= pick;


}
else if (name.Equals("D OUBLE")||name.E quals("FLOAT"))
{

values[b].Add( (Convert.ToDoub le(data.Rows[a][b])));

}
else if (name.Equals("D ECIMAL")||name. Equals("Int32") )
{

int num=Convert.ToI nt32(data.Rows[a][b]);

values[b].Add(num);

}
}
}
[/code]
Problem: In all places above where i use the syntax
values[b].Add(num);
is not working well and not storing the values that it should have to do according to logic and syntax.

[Shashi Sadasivan]

To confirm on your code..
is "values" an arrayList?
if yes
is it an arraylist of arraylists?
or is it an arraylist of strings?

cheers

[chenxsh2615]

you can use DataSet!

[newkhan]

you can use DataSet!

Yes You are right it is arraylist of arryarslist. I want to store all double, int and string type values in it . Now guide me in right way.
Thanx

[Plater]

What is the error you are getting? It looks ok at first glance, although it seems rather messing when you could fill a single DataTable with everything in like 3lines of code

[newkhan]

What is the error you are getting? It looks ok at first glance, although it seems rather messing when you could fill a single DataTable with everything in like 3lines of code

Hi Plater,
It does not give any sytax error but when i wanted to check values in it then I came to know that there is no value in the arraylist. So, as a result there was not value in the sql server table that was created and no values were inserted through insert command. What did you mean by "you can use dataset". Plater please help me.

[r035198x]

.... What did you mean by "you can use dataset". Plater please help me.

Google it.