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  1. #1
    Join Date
    Dec 2012

    Excel and ' Invalid Operation Problems'


    I'm currently making a program, that will read data from a file, that contains a number different variables. These being, D - Date , T, R, P and H which are just values. The program will need to add up all the 'T' values, 'R' values , including the P and H values separately. With the same format and outputting the average of each value. ( I'm sure most of it has been done already via the code I currently have). Though, their are some problems that arise. (I'll explain, further down.

    The separator char being ':'.

    The Code
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.IO;
    //Class Libary IO has been added to the list
    class Program
        public static void Main()
            //FileStream file = new FileStream(@"c:\CSharp\CW1_2012.txt", FileMode.Open);
            // StreamReader read = new StreamReader(file);
            // The file will be located and and opened for use further into the program.
            Dictionary<string, List<int>> variableList = new Dictionary<string, List<int>>();
            string whiteSpace = new string(File.ReadAllText(@"c:\CSharp\CW1_2012.txt").Where(dataFile => !char.IsWhiteSpace(dataFile)).ToArray());
            // This strips the file of white space.
            string[] fields = whiteSpace.Split(new char[] { ':' }, StringSplitOptions.None);
            // This splits the  file up into pieces using the semi colon as the point to seperate each char.
            List<int> numbers = new List<int>();
            // This creates a new list.
            foreach (string field in fields
            // This looks through all of the fields.
                if (char.IsDigit(field.FirstOrDefault()))
                    List<int> currentlist = null;
                    if (!variableList.TryGetValue(field, out currentlist))
                        currentlist = new List<int>();
                        variableList.Add(field, currentlist);
                        foreach (var pair in variableList)
                            Console.WriteLine("{0} {1}", pair.Key, pair.Value.Average());

    The problem arises at this section of the program. I get an error saying 'Sequence contains no elements'
    I'm unsure what to do from here. I have looked for other solutions and tryed to figure what is wrong but as you can see I havent found one just yet xD

    When I try to debugg it , it simply flashes the cmd box for a second so, now im not sure if the program is doing what it is meant to do.


    --- Second small problem.

    If i can get a fix for the current code, how would I get it to export the data + the produced averages into an excel file? I have this code I would like to use if possible.
                var excelApp = new Excel.Application();
                excelApp.Visible = true;
    Excel._Worksheet workSheet =     (Excel.Worksheet)excelApp.ActiveSheet;
                workSheet.Cells[1, "A"] = "ID Number";
                workSheet.Cells[1, "B"] = "Current Balance";
                for (int row = 1; row <= 10; row++)
                    workSheet.Cells[row + 1, "A"] = 34*row;
                    workSheet.Cells[row + 1, "B"] = "Text here";
    using Excel = Microsoft.Office.Interop.Excel;
    Thank you for reply in advance

  2. #2
    Join Date
    Feb 2011
    United States

    Re: Excel and ' Invalid Operation Problems'

    Hi and welcome to the forum. You can get your code to format nicely by surrounding it with [code] and [/code] tags (I have added this to your first post for you).
    Best Regards,

    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

  3. #3
    Join Date
    Dec 2012

    Re: Excel and ' Invalid Operation Problems'

    Quote Originally Posted by BioPhysEngr View Post
    Hi and welcome to the forum. You can get your code to format nicely by surrounding it with [code] and [/code] tags (I have added this to your first post for you).
    Thank you.

    And didn't know about using the [code] on forums til now. :P

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