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How can I remove the last two numbers from a number that's a double before making it a string?

I have this number in C#
Double a = 1.2345678
What I would like is for it to look like this after it's made into a string:
1.23456

First, convert it to string.
for example the string is defined as S.
then apply this method:
S.Remove(S.Length -2);

You can acheive that in many ways:
Code:
using System;
using System.Linq;
using System.Text;
namespace RemovingLastTwoNumber
{
class Program
{
static void Main(string[] args)
{
// Method 1.
double number = 1.2345678;
string numberInStringFormat = number.ToString();
string TargetNumber = numberInStringFormat.Substring(0, numberInStringFormat.Length - 2);
Console.WriteLine(number);
Console.WriteLine(TargetNumber);
// Method 2.
string _TargetNumber = Math.Round(number, 5).ToString();
Console.WriteLine(_TargetNumber);
// Method 3.
var characters = number.ToString().ToArray();
var __Characters = characters.Take(7);
StringBuilder __targetNumber = new StringBuilder();
foreach (var character in __Characters)
{
__targetNumber.Append(character);
}
Console.WriteLine(__targetNumber);
}
}
}

Link combo box and parallel array

I need help linking or mapping a combo box to a parallel array in C#. I have a class project where I need to create a payroll system that displays the Net Pay after taxes.
I want to link parallel arrays that have all the employee information needed for payroll to the option selected in the combo box. I feel like I almost have it, but I don't know how to link the option selected from the combo box and the parallel arrays I have set up.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ZNSPayrollSystem
{
public partial class ZNSPayrollSystem : Form
{
public ZNSPayrollSystem()
{
InitializeComponent();
string[] arr = { "001 Peters", "002 Barnes", "003 Harris" };
cboEmp.DataSource = arr.ToArray();
}
private void btnCalc_Click(object sender, EventArgs e)
{
//parallel arrays
int[] empID = { 001, 002, 003 };
string[] empName = { "James Peters", "Sarah Barnes", "Candice Harris" };
double[] hrsWorked = { 40, 40, 40 };
double[] empWage = { 55.50, 65.50, 75.70 };
//declarations
double dblTaxRate = 8.2 / 100;
double dblNetPay;
double dblGrossPay;
double dblTaxWithheld;
dblGrossPay = hrsWorked[] * empWage[];
dblTaxWithheld = dblGrossPay * dblTaxRate;
dblNetPay = dblGrossPay - dblTaxWithheld;
txtGross.Text = dblGrossPay.ToString();
txtTax.Text = dblTaxWithheld.ToString();
txtNetPay.Text = dblNetPay.ToString();
}
}
}

Use the SelectedIndex property of the Combobox:
int i = cboEmp.SelectedIndex;
if (i != -1)
{
dblGrossPay = hrsWorked[i] * empWage[i];
}
i == -1 means nothing is selected. You may want to handle this separately to avoid getting any exceptions.

Replacing ### with integers [closed]

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By using RegEx, or String.Replace, I need to replace any number of consecutive #'s (with the appropriate number of leading 0's) with an integer. I know I can search for # in the string, get the First and Last index, Last-First for the length, then replace with String.Replace. I was hoping someone would have a faster, and more slick answer.
Method header would be:
string ReplaceHashtagsWithInt(string input, int integer)
Examples:
Input -> "String####_Hi##", 2
Output -> "String0002_Hi02"
Input -> "String####_Hi##", 123
Output -> "String0123_Hi123"

public static class Testing
{
public static void Main()
{
ReplaceHashtagsWithInt("String####_Hi##", 2);
ReplaceHashtagsWithInt("String####_Hi###", 123);
ReplaceHashtagsWithInt("String####_Hi#######", 123);
}
public static string ReplaceHashtagsWithInt(string input, int integer)
{
Regex regex = new Regex("#+");
var matches = regex.Matches(input).Cast<Match>().Select(m => m.Value).ToArray();
Array.Sort(matches);
Array.Reverse(matches);
foreach (string match in matches)
{
Regex r = new Regex(match);
string zeroes = new string('0', match.Length - integer.ToString().Length) + integer;
input = r.Replace(input, zeroes);
}
return input;
}
}

You can do something like this:
using System;
using System.Text;
using System.Text.RegularExpressions;
public static class Testing
{
public static void Main()
{
Console.WriteLine(ReplaceHashtagsWithInt("###_####_#", 1));
Console.WriteLine(ReplaceHashtagsWithInt("###_####_#", 23));
Console.WriteLine(ReplaceHashtagsWithInt("###_####_#", 456));
Console.WriteLine(ReplaceHashtagsWithInt("###_####_#", 7890));
Console.WriteLine(ReplaceHashtagsWithInt("###_####_#", 78901));
}
public static string ReplaceHashtagsWithInt(string input, int integer)
{
Regex regex = new Regex("#+");
StringBuilder output = new StringBuilder(input);
int allig = 0;
for(Match match = regex.Match(input);match.Success;match = match.NextMatch())
{
string num = integer.ToString();
if(num.Length<=match.Length)
for(int i=0;i<match.Length;i++)
{
if(i<match.Length-num.Length)
output[match.Index+i+allig] = '0';
else
output[match.Index+i+allig] = num[i-match.Length+num.Length];
}
else
{
output.Remove(match.Index+allig,match.Length);
output.Insert(match.Index+allig,num);
allig+=num.Length-match.Length;
}
}
return output.ToString();
}
}

How do I replace specific characters from a c# string?

if I have a string along the lines of: "user:jim;id:23;group:49st;"
how can I replace the group code (49st) with something else, so that it shows: "user:jim;id=23;group:76pm;"
sorry if the question is easy but I haven't found a specific answer, just cases different than mine.

You can use the index of "group" like this
string s = "user:jim;id:23;group:49st;";
string newS = s.Substring(0,s.IndexOf("group:") + 6);
string restOfS = s.IndexOf(";",s.IndexOf("group:") + 6) + 1 == s.Length
? ""
: s.Substring(s.IndexOf(";",s.IndexOf("group:") + 6) + 1);
newS += "76pm;";
s = newS + restOfS;
The line with the s = criteria ? true : false is essentially an if but it is put onto one line using a ternary operator.
Alternatively, if you know what text is there already and what it should be replaced with, you can just use a Replace
s = s.Replace("49st","76pm");
As an added precaution, if you are not always going to have this "group:" part in the string, to avoid errors put this inside an if which checks first
if(s.Contains("group:"))
{
//Code
}

Find the match using regex and replace it with new value in original string as mentioned below:
string str = "user:jim;id=23;group:49st;";
var match = Regex.Match(str, "group:.*;").ToString();
var newGroup = "group:76pm;";
str = str.Replace(match, newGroup);

This solution should work no matter where the group appears in the string:
string input = "user:jim;id:23;group:49st;";
string newGroup = "76pm";
string output = Regex.Replace(input, "(group:)([^;]*)", "${1}"+newGroup);

Here is a very generic method for splitting your input, changing items, then rejoining items to a string. It is not meant for single replacement in your example, but is meant to show how to split and join items in string.
I used Regex to split the items and then put results into a dictionary.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
string pattern = "(?'name'[^:]):(?'value'.*)";
string input = "user:jim;id:23;group:49st";
Dictionary<string,string> dict = input.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries).Select(x => new
{
name = Regex.Match(x, pattern).Groups["name"].Value,
value = Regex.Match(x, pattern).Groups["value"].Value
}).GroupBy(x => x.name, y => y.value)
.ToDictionary(x => x.Key, y => y.FirstOrDefault());
dict["group"] = "76pm";
string output = string.Join(";",dict.AsEnumerable().Select(x => string.Join(":", new string[] {x.Key, x.Value})).ToArray());
}
}
}

That is just one way to do it. I hope it will help you.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace stringi
{
class Program
{
static void Main(string[] args)
{
//this is your original string
string s = "user:jim;id:23;group:49st";
//string with replace characters
string s2 = "76pm";
//convert string to char array so you can rewrite character
char[] c = s.ToCharArray(0, s.Length);
//asign characters to right place
c[21] = s2[0];
c[22] = s2[1];
c[23] = s2[2];
c[24] = s2[3];
//this is your new string
string new_s = new string(c);
//output your new string
Console.WriteLine(new_s);
Console.ReadLine();
}
}
}

string a = "user:jim;id:23;group:49st";
string b = a.Replace("49st", "76pm");
Console.Write(b);

convert visio vba method into c#

Hello I would like to convert this vba method into C#. I am trying to get the IDs of a selection and print them out. In particular I am having trouble converting the GetIDs() method(a built in method within visio vba) into C#.
Public Sub getCapabilityRectIDs()
Dim vsoSelection1 As Visio.Selection
Dim selectionIDs() As Long
Set vsoSelection1 = Application.ActiveWindow.Page.CreateSelection(visSelTypeByLayer, visSelModeSkipSuper, "Capability")
Application.ActiveWindow.Selection = vsoSelection1
Call vsoSelection1.GetIDs(selectionIDs)
For i = 0 To UBound(selectionIDs)
Debug.Print selectionIDs(i)
Next i
End Sub
This is what I have so far in C#
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using Visio = Microsoft.Office.Interop.Visio;
class Program
{
static void Main(string[] args)
{
//create the object that will do the drawing
VisioDrawer Drawer = new VisioDrawer();
Drawer.selectShpLayer("Capability");
}
}
class VisioDrawer
{
public Visio.Application VisApp;
public static Visio.Page acPage;
public Visio.Selection LayerSelection;
public VisioDrawer()
{
//create the application
VisApp = new Visio.Application();
VisApp.Documents.Open(#"............. - abc.vsdm");
ActiveDoc = VisApp.ActiveDocument;
acPage = VisApp.ActivePage;
}
public void selectShpLayer (string layerName){
Int i = 0;
long[] lngRowIDs;
//this selects the shapes of the selected layer
LayerSelection = acPage.CreateSelection(Microsoft.Office.Interop.Visio.VisSelectionTypes.visSelTypeByLayer, Microsoft.Office.Interop.Visio.VisSelectMode.visSelModeOnlySuper,layerName);
LayerSelection.GetIDs(lngRowIDs);
for (i = 0; i < lngRowIDs.Length; i++)
{
Debug.Write(lngRowIDs[i]);
}
}
}
Thanks in advance!

I created a visio doc and drew 3 simple shapes. I then created a layer called "cool" and added those 3 shapes to it.
I don't understand enough about the shape selection, you had visSelModeOnlySuper which may work for you, but did not work for the case I created. The default is visSelModeSkipSuper (which worked for me)
Here's the API page that describes how to use the createSelection:
https://msdn.microsoft.com/en-us/library/office/ff765565.aspx
Here is my sample code:
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using Visio = Microsoft.Office.Interop.Visio;
class Program
{
static void Main(string[] args)
{
//create the object that will do the drawing
VisioDrawer Drawer = new VisioDrawer();
Drawer.selectShpLayer("cool");
}
}
class VisioDrawer
{
public Visio.Application VisApp;
public static Visio.Page acPage;
public Visio.Selection LayerSelection;
public VisioDrawer()
{
//create the application
VisApp = new Visio.Application();
VisApp.Documents.Open(#"c:\temp\trial.vsdm");
acPage = VisApp.ActivePage;
}
public void selectShpLayer(string layerName)
{
int i = 0;
int[] lngRowIDs;
Array lngRowIDArray;
//this selects the shapes of the selected layer
LayerSelection = acPage.CreateSelection(Microsoft.Office.Interop.Visio.VisSelectionTypes.visSelTypeByLayer, Microsoft.Office.Interop.Visio.VisSelectMode.visSelModeSkipSuper, layerName);
LayerSelection.GetIDs(out lngRowIDArray);
lngRowIDs = (int[])lngRowIDArray;
for (i = 0; i < lngRowIDs.Length; i++)
{
Debug.Write("Object ID: " + lngRowIDs[i].ToString() + "\n");
}
}
}
And it produces this output:
Object ID: 1
Object ID: 2
Object ID: 3
If you change the debug line to this:
Debug.Write("Object ID: " + lngRowIDs[i].ToString() + " -- " + acPage.Shapes.ItemFromID[i].Name + "\n");
The output gets even more useful:
Object ID: 1 -- ThePage
Object ID: 2 -- Circle
Object ID: 3 -- Rectangle