datatype in DataGridview - C# Discussion Boards

MarkB1233-Mar-14 8:57

MarkB123

3-Mar-14 8:57

Richard, many thanks for taking the time to reply. I'll check out the links you kindly posted.

Pete O'Hanlon3-Mar-14 10:09

Pete O'Hanlon

3-Mar-14 10:09

What I would do is have the functionality declared in an external assembly - the classes I wanted would implement interfaces stored in a DLL or the Exe and I would then use MEF to wire things together. This would allow you to use the interface as your type in the main program.

Richard Andrew x643-Mar-14 13:16

Richard Andrew x64

3-Mar-14 13:16

MEF?

The difficult we do right away...
...the impossible takes slightly longer.

Matt T Heffron3-Mar-14 13:59

Matt T Heffron

3-Mar-14 13:59

Managed Extensibility Framework[^]
Wonderful magic!

BobJanova4-Mar-14 5:27

BobJanova

4-Mar-14 5:27

You can actually catch the exception that gets thrown when a class can't be loaded. The trick is that the class must not be used in your Main method, because entering a method which uses a class the point that the class binder tries to load it, and you can't catch it.

So you can do something like

static void Main() {
 try { EntryPoint(); }
 catch(FileNotFoundException) { 
  // ...
  // e.g. put up message that a dependency is missing
 }
}

static void EntryPoint() {
 var x = new DependencyClass(); // declared in other assembly
}

The 'correct' way to do it is to handle Application.AssemblyResolve but what I've described here can be useful if all you want to do is tell the user they need to install something which is missing in a more graceful way.

Re: datatype in DataGridview

MarkB1234-Mar-14 5:34

MarkB123

4-Mar-14 5:34

Thanks BobJanova, this might be all I need.

datatype in DataGridview

naylynn3-Mar-14 4:29

naylynn

3-Mar-14 4:29

how to divided cell in Datagrid view. My code is don't work in fraction number. Someone advise me. Thanks you all.

  foreach (DataGridViewRow row in this.dataGridView1.Rows)
            {
                int R1 = row.Index;
for (b = 0; b < dataGridView2.ColumnCount; b++)
                    {
                        a = 0;
                        for (c = 0; c < dataGridView2.RowCount; c++)
                        {
                            Ans_Grid.Rows[R1].Cells[b].Value =
                                 (((Double.Parse(dataGridView1.Rows[R1].Cells[c].Value.ToString()))
                                * (Double.Parse(dataGridView2.Rows[c].Cells[b].Value.ToString())))).ToString()
;
Ans_Grid.Rows[R1].Cells[b].Value = a + Convert.ToInt16(Ans_Grid.Rows[R1].Cells[b].Value);
                             a = Convert.ToDouble(Ans_Grid.Rows[R1].Cells[b].Value);

Raj Mouli7-Mar-14 18:51

Raj Mouli

7-Mar-14 18:51

may be decimal will help you in getting your issue fixed

Mouli

Invalid Argument in For Loop

computerpublic2-Mar-14 8:03

2-Mar-14 8:03

<pre>/* I am getting an invalid argument error in my for loop and I don't understand why */
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Boolean;

namespace Applica
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo da = new DirectoryInfo("C:\\Folder9");
            FileInfo[] Arr = da.GetFiles();
            FileInfo ap = Arr[Arr.Length - 1];
            long Totbyte = ap.Length;
            string filePath = ap.FullName;
            string temPath = Path.GetTempFileName();
            byte[] data = File.ReadAllBytes(filePath);
            File.WriteAllBytes(temPath, data);            
            byte[] dataB = new byte[1];
            BitArray bits = new BitArray(dataB);
            for (uint counter = 0; counter < Totbyte; counter++)
            {
                dataB[0] = data[counter];
                for (uint count = 0; count < bits.Length; count++)
                {
                    if (bits[count] == 0)
                        Console.Write(bits[count] ? "1" : "0");
                }
            }
        }
    }
}

Pete O'Hanlon2-Mar-14 8:06

Pete O'Hanlon

2-Mar-14 8:06

Totbyte is a long. Your loop is a uint.

computerpublic2-Mar-14 8:09

2-Mar-14 8:09

Even if I change that variable to a constant, the error still exist.

computerpublic2-Mar-14 8:12

2-Mar-14 8:12

My error is in the last 2 lines of the code:

bits[count]

PIEBALDconsult2-Mar-14 8:27

PIEBALDconsult

2-Mar-14 8:27

An array index has to be an int (or something implicitly convertable to an int).

http://msdn.microsoft.com/en-us/library/system.collections.ilist.item(v=vs.110).aspx[^]

This space intentionally left blank.

computerpublic2-Mar-14 8:33

2-Mar-14 8:33

I changed it to an int and I still get an error.

Eddy Vluggen2-Mar-14 9:04

Eddy Vluggen

2-Mar-14 9:04

The same one or a new one?

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Message Closed

2-Mar-14 9:17

2-Mar-14 9:17

Message Closed

Richard MacCutchan2-Mar-14 22:43

Richard MacCutchan

2-Mar-14 22:43

He did not insult you, he asked you a perfectly reasonable question. You have stated that you get an error, but you have given no details of what that error is. Is it "invalid argument", and if so on what line of code. If it is something different then show the details. But in either case please be clear what the problem is and where it occurs, and people will try to help you. But if you resort to insults and rudeness you are likely to get no help at all.

noone24072-Mar-14 17:46

noone2407

2-Mar-14 17:46

Can you comment all your code?
Then I will fix it for you.
PS: always check variable is null or not, if you are not sure before calling it

computerpublic2-Mar-14 18:00

2-Mar-14 18:00

<pre>
using System;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Boolean;
 
namespace Applica
{
    class Program
    {
        static void Main(string[] args)
        {
            DirectoryInfo da = new DirectoryInfo("C:\\Folder9");
            FileInfo[] Arr = da.GetFiles();
            FileInfo ap = Arr[Arr.Length - 1];
            long Totbyte = ap.Length;//file length
            string filePath = ap.FullName;//file name
            string temPath = Path.GetTempFileName();//path
            byte[] data = File.ReadAllBytes(filePath);//reading entire file
            File.WriteAllBytes(temPath, data);       //writing entire file to byte array     
            byte[] dataB = new byte[1];//declaring a one element byte array
            BitArray bits = new BitArray(dataB);//moving one byte to a bit array (8 bits)
            for (uint counter = 0; counter < Totbyte; counter++)
            {
                dataB[0] = data[counter];//moving data one byte at time.
                for (uint count = 0; count < bits.Length; count++)//looking at each bit of each byte
                {
                    if (bits[count] == 0)//PROBLEM AREA
                        Console.Write(bits[count] ? "1" : "0");
                }
            }
        }
    }
}

noone24072-Mar-14 18:32

noone2407

2-Mar-14 18:32

I don't understand what you are trying to do.
But if you want to write out the byte array of the file then here is the code

DirectoryInfo da = new DirectoryInfo("C:\\Folder9");
FileInfo[] Arr = da.GetFiles();
FileInfo ap = Arr[Arr.Length - 1];
long Totbyte = ap.Length;//file length
string filePath = ap.FullName;//file name
byte[] data = File.ReadAllBytes(filePath);//reading entire file
for (int counter = 0; counter < Totbyte; counter++)
{
    Console.Write(data[counter]);
}

Remember that is byte array, not bit array
If you to write out bit array instead of byte array, replace

Console.Write(data[counter]);

Into

string yourByteString = Convert.ToString(data[counter], 2).PadLeft(8, '0');
Console.Write(yourByteString+" ");

modified 3-Mar-14 0:40am.

OriginalGriff2-Mar-14 22:49

OriginalGriff

2-Mar-14 22:49

There are two problems here: firstly that an array index needs to be an integer - and a uint needs an explicit cast to int - you can't use an implicit cast because it could "throw away" data in the form of positive values with the top bit set. Easiest solution: use int value in your for loop.

The second problem is that the BitArray indexer does not return an int value: it returns a bool. So if you correct the first error, the compiler will complain that it cannot compare an int with a bool!

Those are easily fixed to let your program compile:

for (int counter = 0; counter < Totbyte; counter++)
    {
    dataB[0] = data[counter];
    for (int count = 0; count < bits.Length; count++)
        {
        if (!bits[count])
            Console.Write(bits[count] ? "1" : "0");
        }
    }

But... It's not going to work.
You don't change the value in Bits at all inside your outer loop - so each byte "value" is going to print as the same sequence of bits.

Personally, I wouldn't use a BitArray - it's an unnecessary complication here - just use the C# standard bit manipulation operators:

for (int counter = 0; counter < Totbyte; counter++)
    {
    int b = (int) data[counter];
    for (int count = 0; count < 8; count++)
        {
            Console.Write(b & 1);
            b = b >> 1;
        }
    }

Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)

computerpublic3-Mar-14 3:52

3-Mar-14 3:52

I only need to evaluate if whether or not a "0" exist in the BitArray string. I dont care about the "1".

OriginalGriff3-Mar-14 4:30

OriginalGriff

3-Mar-14 4:30

And what are you going to do if it is a one? now print anything? Laugh | :laugh:

Trust me: AND the value with 1 returns either 0 or 1 depending on the state of teh least significant bit the in value. Using >> then shifts the whole input down a single bit, so the second bit takes the place of first, and so forth. It's a lot more efficient than using a BitString for each byte.