Get total Bytes from Object

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Hi there,

I have a List<string> populated with data. And I want to know how many total bytes it contains.
But this shows an exception "Input string is in incorrect format".

C#

List<string> lll = new List<string>();
            lll.Add("Hello");
            lll.Add("how are you");
            byte sssss = Convert.ToByte(lll);

I don't want to make it in Byte[]. is there any way i can get this?

Thanks :)

Posted 15-May-13 20:25pm

Manish Kumar Namdev

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OriginalGriff · Accepted Answer · 2013-05-15T20:32:00

Solution 1

You can't just say "I want the size of the whole list" without examining the length of each string in the collection. You can say "How many strings ar in the collection?" very easily:

C#

int count = lll.Count;

But to work out how many bytes are ar in all the strings it contains, takes a little more work.
There are a number of ways to do it, the simplest is an explicit loop:

C#

int count = 0;
foreach (string s in lll)
    {
    count += s.Length;
    }
Console.WriteLine(count);

Or you could use Linq methods:

C#

int count = lll.Sum(s => s.Length);
Console.WriteLine(count);

But that is really just "hiding" the loop!

Posted 15-May-13 20:32pm

OriginalGriff

Comments

Manish Kumar Namdev 16-May-13 3:02am

Hi thanks for reply.
Byte[] bts = Program.GetBytes(lll.ToString());
Console.WriteLine(bytes.Length);

static byte[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
In this method it is returning 96

And
int count = lll.Sum(s => s.Length);
Console.WriteLine(count);

This returns 16.

What is happening in the above both codes and why they are showing difference.
Please make me correct and guide me to understand about this difference.

Thanks

MuhammadUSman1 16-May-13 3:09am

In your case:
you are converting lll.ToString() and taking its bytes mean in your GetBytes method it taking parameter values is "System.Collections.Generic.List`1[System.String]" and taking its byts and return. that is totally invalid.
you should try this.

int count = lll.Sum(s => s.Length); Console.WriteLine(count);

MuhammadUSman1 16-May-13 3:10am

OriginalGriff ans is correct. follow him.
thanx

OriginalGriff 16-May-13 3:20am

As MuhammadUsman1 said, when you call ToString on a List of any form, you do not get the content of the List, but instead the name of the class that the List is in.
This is the default operation of object.ToString, and unless it is overridden (as it is for int, double, float, and so forth) that is what you get. This can confuse people, especially when they start using Image or Bitmap classes, and assume that myImage.ToString will give them a string version of the JPG file they loaded. It won't - it gives you "System.Drawing.Bitmap" which isn't a lot of help when you save it to a database... :laugh:

MuhammadUSman1 16-May-13 3:03am

+5