I need to loop through some local variables which are used to drive a class that gets data from an excel sheet.
Basically I have 18 questions with radio button answers so I want to be able to loop through these and based on the value in the excel data select the right radio button. My thinking is I would loop through question 1 to 18 and then use a split to set the right radio button.
Here is my code
//Loops questions 1 through 18
int i = 0;
int ex = 1;
do
{
var Answer = userData + (".Question" + ex);
Console.WriteLine(Answer);
switch (Answer)
{
case "Strongly Agree":
driver.FindElement(By.XPath("//*[#id='ctl00_MainBody_Client_lvRiskProfileQuestions_ctrl" + i + "_radAnswerID_" + 4 + "']")).Click();
break;
case "Agree":
driver.FindElement(By.XPath("//*[#id='ctl00_MainBody_Client_lvRiskProfileQuestions_ctrl" + i + "_radAnswerID_" + 3 + "']")).Click();
break;
case "Neither Agree nor Disagree":
driver.FindElement(By.XPath("//*[#id='ctl00_MainBody_Client_lvRiskProfileQuestions_ctrl" + i + "_radAnswerID_" + 2 + "']")).Click();
break;
case "Disagree":
driver.FindElement(By.XPath("//*[#id='ctl00_MainBody_Client_lvRiskProfileQuestions_ctrl" + i + "_radAnswerID_" + 1 + "']")).Click();
break;
case "Strongly Disagree":
driver.FindElement(By.XPath("//*[#id='ctl00_MainBody_Client_lvRiskProfileQuestions_ctrl" + i + "_radAnswerID_" + 0 + "']")).Click();
break;
}
i++;
ex++;
} while (i < 18);
My problem appears to be that the Answer variable is not being set to the value in excel but rather the link its self. The output from the write line is OnlineStore.TestDataAcess.ExcelTestDataParser.Question1
and so on.
Any suggestions of how to get this working will be greatly received
You could try getting the fields of the ParserObject and then getting their value dynamically. For example:
var questionNumber = "Question" + i;
var field = userData.GetType().GetField(questionNumber);
var userResponse = field.GetValue(userData);
var Answer = userResponse + (".Question" + ex);
This should give you the value of whichever question you pass to GetField. Note that GetField returns null of the method is not found so you might want to wrap the field.GetValue in a try-catch.
Also this will only work for member variables not auto-implemented properties i.e. those defined like public string Question1 {get; set;}.
If the questions are added as auto-implemented properties, you can do this instead:
var questionNumber = "Question" + i;
var property= userData.GetType().GetProperty(questionNumber);
var userResponse = property.GetValue(userData);
var Answer = userResponse + (".Question" + ex);
This also assumes a lot about your Parser object, how is each question represented in the parser class?
Related
I'm using MathNet Symbolics to handle the symbolic algebra portion of a program I'm working on. The general use is create a pair of symbolic formulas, and then divide those two formulas. This works quite well most of the time. However, sometimes, it does not want to do more complex simplification. For example:
(512*r*t*w + 2048*r*t^2*w)
-----------------------------------------------------------------------
(512*r*t*w + 512*r^2*t*w + 3072*r*t^2*w + 3072*r^2*t^2*w + 1024*r*t^3*w)
With some work, I've been able to have it eliminate w from the equation, as it is in all terms top and bottom:
(512*r*t + 2048*r*t^2)
--------------------------------------------------------------
(512*r*t + 512*r^2*t + 3072*r*t^2 + 3072*r^2*t^2 + 1024*r*t^3)
However, I cannot figure out how to make it find common terms:
(512*r*t)*(1 + 4*t)
--------------------------------------
(512*r*t)(1 + r + 6*t + 6*r*t + 2*t^2)
And eliminate these terms:
(1 + 4*t)
-----------------------------
(1 + r + 6*t + 6*r*t + 2*t^2)
I've been using Wolfram Alpha as my gold standard for checking my work. The code from LinqPad I've been working on most of the afternoon, that gets my the elimination of w:
var h1 = MathNet.Symbolics.Infix.ParseOrUndefined("(1/8)*r*t*w + (1/2)*r*t^2*w");
var h2 = MathNet.Symbolics.Infix.ParseOrUndefined("(1/8)*r*t*w + (1/8)*r^2*t*w + (3/4)*r*t^2*w + (3/4)*r^2*t^2*w + (1/4)*r*t^3*w");
Infix.Print(Rational.Expand(h1/h2)).Dump(); //Prints (512*r*t*w + 2048*r*t^2*w)/(512*r*t*w + 512*r^2*t*w + 3072*r*t^2*w + 3072*r^2*t^2*w + 1024*r*t^3*w)
var tot = Rational.Expand(h1 / h2);
var simplified = true;
do
{
simplified=false;
foreach (var v in Rational.Variables(tot))
{
var result = Polynomial.Divide(v, h1, h2);
if (!result.Item1.Equals(MathNet.Symbolics.Expression.Zero))
{
simplified = true;
tot = result.Item1;
break;
}
}
}while(simplified);
tot = Rational.Expand(tot);
Infix.Print(tot).Dump(); //Prints (512*r*t + 2048*r*t^2)/(512*r*t + 512*r^2*t + 3072*r*t^2 + 3072*r^2*t^2 + 1024*r*t^3)
Can someone give me pointers to how to proceed with MathNet? I've tried various combinations of functions from Rational and Polynomial, and have not been able to move past this point.
I've just published a new Math.NET Symbolics release v0.6.0 which includes a new Rational.Reduce routine that removes such common simple factors (also executed as part of Rational.Expand):
var h1 = Infix.ParseOrThrow("(1/8)*r*t*w + (1/2)*r*t^2*w");
var h2 = Infix.ParseOrThrow("(1/8)*r*t*w + (1/8)*r^2*t*w + (3/4)*r*t^2*w + (3/4)*r^2*t^2*w + (1/4)*r*t^3*w");
var q1 = h1/h2;
Infix.Print(q1);
// returns: ((1/8)*r*t*w + (1/2)*r*t^2*w)/((1/8)*r*t*w + (1/8)*r^2*t*w + (3/4)*r*t^2*w + (3/4)*r^2*t^2*w + (1/4)*r*t^3*w)
var q2 = Rational.Expand(q1);
Infix.Print(q2);
// returns: (1 + 4*t)/(1 + r + 6*t + 6*r*t + 2*t^2)
Unfortunately quite a few of the univariate polynomial and rational routines like the new square-free factorization do not have a multivariate counterpart yet. Univariate routines expect one symbol parameter, while multivariate ones expect a symbol set.
I'm working on a project where I need to develop a fractional calculator.
I want to add something extra to it, such as having a working out box that displays how the user got their answer.
For example, say I enter 1 1/2 + 1 1/2 into the calculate and press "Calculate", it would then display the answer and how it got the answer such as:
= 3/2 + 3/2
= ((3 × 2) + (3 × 2)) / (2 × 2)
= (6 + 6) / 4
= 12/4
= 3/1
= 3
Here is my basic, crappy looking, program: http://gyazo.com/1dc27b531873c48cdb198baa40b3af9a
I want it to display the working out in the 'Calculations' box below.
How am I able to do this?
Your question is missing some details, so here is a simple answer to begin with.
(I guess your GUI is winforms, and you have a trigger for the calculate OnClick)
To add text into your "Calculations" textbox the code you need is (for your example):
private void calculateButton_Click(object sender, EventArgs e)
{
int common_den = denumerator1*denumerator2;
int new_enumerator1 = enumerator1 * denumerator2;
int new_enumerator2 = enumerator2 * denumerator1;
string myCalculations = " = " + enumerator1.ToString() + "/" + denumerator1.ToString() + " + " + enumerator2.ToString() + "/" + denumerator2.ToString();
string myCalculations += " = " + new_enumerator1.ToString() + "/" + common_den.ToString() + " + " + new_enumerator2.ToString() + "/" + common_den.ToString();
string myCalculations += " = " + (new_enumerator1 + new_enumerator2).ToString() + "/" + common_den.ToString();
calculationsTextBox.Text = myCalculations;
}
If you are looking for the code that will build the calculation string - you need to ask for it explicitly
This question already has answers here:
What is a NullReferenceException, and how do I fix it?
(27 answers)
Closed 8 years ago.
I am getting this error and I have absolutely no idea how to get rid of it. I allocated the array but cant seem to get it initialized correctly. I allocated the array on line 13 NullReference error. I read about it but in this case I have no idea what I'm doing wrong.
I have the following code.
namespace A4
{
public partial class frmAddStudent : Form
{
public frmAddStudent()
{
InitializeComponent();
}
// Declare variables to be used by both event handlers
int CountStudents = 0;
double Average = 0;
Student[] ClassList = new Student[50];
private void btnAdd_Click(object sender, EventArgs e)
{
// Create new student and assign name etc provided by user
Student _Student = new Student();
_Student.Name = txtName.Text;
_Student.Surname = txtSurname.Text;
_Student.Age = Convert.ToInt32(txtAge.Text);
_Student.ITMark = Convert.ToInt32(txtIT.Text);
_Student.MathMark = Convert.ToInt32(txtEng.Text);
_Student.EngMark = Convert.ToInt32(txtMath.Text);
// Use the hasPassed method to display an appropriate message after the
// student has been added
MessageBox.Show("Student added.");
// Increase counter and display how many students added so far
CountStudents++;
Average = Convert.ToInt32(txtIT.Text) + Convert.ToInt32(txtEng.Text) + Convert.ToInt32(txtMath.Text);
_Student.AverageMark = Average / 3;
//Display Student's properties
richTextBox1.Text += ("Student: " + Convert.ToString(CountStudents) +
"\nName: " + _Student.Name +
"\nSurname: " + _Student.Surname +
"\nAge: " + _Student.Age +
"\nStudent Average: " + Convert.ToString(_Student.AverageMark) + "\n" + "\n");
//Add the newly added student to the ClassList array
ClassList[CountStudents - 1] = _Student;
//Clear the list
txtSurname.Clear();
txtName.Clear();
txtAge.Clear();
txtIT.Value = 0;
txtEng.Value = 0;
txtMath.Value = 0;
txtName.Focus();
}
private void displayAll_Click(object sender, EventArgs e)
{
richTextBox1.Clear();
for (int j = 0; j < ClassList.Count(); j++)
{
richTextBox1.Text += ("Student: " + Convert.ToString(j) +
"\nName: " + ClassList[j].Name +
"\nSurname: " + ClassList[j].Surname +
"\nAge: " + ClassList[j].Age +
"\nStudent Average: " + Convert.ToString(ClassList[j].AverageMark) +
"\n" + "\n");
}
//MessageBox.Show("Display all students.");
}
}
}
I suspect your null reference is being thrown in the displayAll_Click method. In that method you iterate over all the elements in the array (i.e. all 50), whether they have a student or not. This is because the Count() returns the length of the array, not the count of array elements that have a Student in them.
You should use either your student count variable CountStudents, in the for loop, or better yet, use List<Student>, which is ideal for your use, and less prone to these problems than an array.
What is "Count()" in the loop:
ClassList.Count();
Did you mean ClassList.Length;?
If you are populating the array dynamically, it's better to use List<Student> ClassList you get less problems with it.
How can I count number of rows in specified column in a Excel sheet?
For example I have 2 columns in a spreadsheet:
A B
--- -----
abc hi
fff hello
ccc hi
hello
The result should look like:
count of A column is 3
count of B column is 4
How can I do this using Microsoft Interop?
The approach suggested by Doug Glancy is accurate and simple to be implemented. You can write the function and retrieve the value from a cell not seenable by the user (ZZ1000, for example). The code is straightforward:
Range notUsed = curSheet.get_Range("ZZ1000", "ZZ1000");
string targetCol = "A";
notUsed.Value2 = "=COUNTA(" + targetCol + ":" + targetCol + ")";
int totRows = Convert.ToInt32(notUsed.Value2);
notUsed.Value2 = "";
UPDATE ---
From your example I understood that you were looking for the total number of non-empty cells, what COUNTA delivers. But, apparently, this is not the case: you want the row number of the last non-empty cell; that is, by using a more descriptive example:
C
---
abc
fff
ccc
hello
You don't want to count the number of non-empty cells (4 in this case; what COUNTA delivers), but the position of "hello", that is, 5.
I don't like relying on Excel formulae too much, unless for clearly-defined problems (like yours, as I understood it initially). Excel formulae deliver still the best solution for what you really want (although its complexity is right "in the limit"). To account for the situation as described above, you can rely on MATCH. If your cells contain text (at least one letter per cell), the code can be changed into:
notUsed.Value2 = "=MATCH(REPT(\"z\",255)," + targetCol + ":" + targetCol + ")";
In case of having numeric values (not a single letter in the cell):
notUsed.Value2 = "=MATCH(LOOKUP(" + Int32.MaxValue.ToString() + "," + targetCol + ":" + targetCol + ")," + targetCol + ":" + targetCol + ")";
If you want to account for both options, you would have to combine these equations: you can create a new formula including both; or you might rely on C# code (e.g., get the values from both equations and consider only the bigger one).
Bear also in mind that you have to account for cases where no matches are found. Here you have a code accounting for both situations (letters and numbers via C# code) and for no matches:
notUsed.Value2 = "=MATCH(REPT(\"z\",255)," + targetCol + ":" + targetCol + ")";
int lastLetter = Convert.ToInt32(notUsed.Value2);
if (lastLetter == -2146826246)
{
lastLetter = 0;
}
totRows = lastLetter;
notUsed.Value2 = "=MATCH(LOOKUP(" + Int32.MaxValue.ToString() + "," + targetCol + ":" + targetCol + ")," + targetCol + ":" + targetCol + ")";
int lastNumber = Convert.ToInt32(notUsed.Value2);
if (lastNumber == -2146826246)
{
lastNumber = 0;
}
if (lastNumber > totRows)
{
totRows = lastNumber;
}
This should do it:
private static int GetRowsInColumnOnWorkSheetInWorkbook(string workbookName, int worksheetNumber, int workSheetColumn)
{
return new Excel.Application().Workbooks.Open(workbookName)
.Sheets[worksheetNumber]
.UsedRange
.Columns[workSheetColumn]
.Rows
.Count;
}
You could have the following override also:
private static int GetRowsInColumnOnWorkSheetInWorkbook(string workbookName, string worksheetName, int workSheetColumn)
{
return new Excel.Application().Workbooks.Open(workbookName)
.Sheets[worksheetName]
.UsedRange
.Columns[workSheetColumn]
.Rows
.Count;
}
It's slightly longer than the other answer, but I think this is more readable, and simpler.
I am cycling through the contents of a two-dimensional array containing the result of a Punnett Square calculation for gene crosses. I need to summarize the result so that the user can readily see the unique instances. I can accomplish this by putting the result into a text box, but when I try and use a ListBox to display the data, part of the information is getting lost, namely a translation of the AaBBCc type data to something that directly relates to the traits that the user initially selected.
This is the main block of code for the operation:
foreach (string strCombination in arrUniqueCombinations)
{
int intUniqueCount = 0;
decimal decPercentage;
foreach (string strCrossResult in arrPunnettSQ)
{
if (strCrossResult == strCombination)
{
intUniqueCount++;
}
}
decPercentage = Convert.ToDecimal((intUniqueCount*100)) / Convert.ToDecimal(intPossibleCombinations);
txtReport.AppendText(strCombination + " appears " + intUniqueCount.ToString() + " times or " + decPercentage.ToString() + "%."+ Environment.NewLine);
lstCrossResult.Items.Add(DecodeGenome(strCombination) + " appears " + intUniqueCount.ToString() + " times or " + decPercentage.ToString() + "%.");
}
For appending the data to the textbox I use this code and it works perfectly:
txtReport.AppendText(DecodeGenome(strCombination) + " appears " + intUniqueCount.ToString() + " times or " + decPercentage.ToString() + "%."+ Environment.NewLine);
Giving the result:
Trait 1 Het.,Trait 3 appears 16 times or 25%.
For adding the result to a list box, this works:
lstCrossResult.Items.Add(strCombination + " appears " + intUniqueCount.ToString() + " times or " + decPercentage.ToString() + "%.");
Giving the result:
AaBBCc appears 16 times or 25%.
But the contents of strCombination is AaBBCc and I need it translated to "Trait 1 Het.,Trait 3", which I accomplish with this bit of code:
private string DecodeGenome(string strGenome)
{
string strTranslation = "";
int intLength = strGenome.Length;
int intCounter = intLength / 2;
string[] arrPairs = new string[intLength / 2];
//Break out trait pairs and load into array
for (int i = 1; i <= intLength; i++)
{
arrPairs[i / 2] = strGenome.Substring((i-1),2);
i++;
}
foreach (string strPair in arrPairs)
{
char chFirstLetter = strPair[0];
char chSecondLetter = strPair[1];
intCounter = intCounter - 1;
if (Char.IsUpper(chFirstLetter))
{
if (!Char.IsUpper(chSecondLetter))
{
if (intCounter > 0)
{
txtReport.AppendText(GetDescription(strPair.Substring(0, 1)) + " Het.,");
}
else
{
txtReport.AppendText(GetDescription(strPair.Substring(0, 1)));
}
}
}
else
{
if (!Char.IsUpper(chSecondLetter))
{
if (intCounter > 0)
{
txtReport.AppendText(GetDescription(strPair.Substring(0, 1)) + ",");
}
else
{
txtReport.AppendText(GetDescription(strPair.Substring(0, 1)));
}
}
}
}
return strTranslation;
}
That has no problem displaying in a text box, but when I try and put it as an item into a list box it turns it into null. Instead of:
"Trait 1 Het.,Trait 3 appears 16 times or 25%."
I get:
" appears 16 times or 25%."
I have tried adding the results to an ArrayList, then populating the listbox after everything is processed, but the result is the same.
Any clues as to why the list box is not accepting the translated AaBBCc information would be greatly appreciated.
strTranslation is never set. Everything is pushed to txtReport.AppendText