Datatable - Convert String To Double?
Jun 21, 2012
data table contain column named as Fld_primary. this column contain value like 0.00 it is double datatype in mysql table.i want store that datatable value in double variable. am always getting error when i convert to double datatype.
my code
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Dim ds5 As dataset1.DTSUMDataTable = TA5.GetData(users)
Dim dttot As Double
dttot = CType(ds5("fld_primary").ToString, Double)
Error:Conversion from string "fld_primary" to type 'Integer' is not valid.
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Jul 23, 2009
Is there an efficient method in VB to check if a string can be converted to a double?I'm currently doing this by trying to convert the string to a double and then seeing if it throws an exception. But this seems to be slowing down my application.
Try
' if number then format it.
current = CDbl(x)
[code].....
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Aug 30, 2010
I want to convert string to double.
[Code]...
num should be 1.5432 but i get 15432 How can i get as it is in the string?
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Mar 24, 2010
Iam using VB 2005 on Vista This is a sample of what I am doing:
Public Class Form 1 Dim WC As String Private Sub Button1_Click
[Code]...
How do I get around this? What I am trying to do is, I really want to use TextBox's for input to enter numbers when the program is running and I also want a MsgBox to appear if an input is not entered because these numbers are important to a final formula further down.
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Aug 4, 2009
How to convert a string array into double array?
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Apr 18, 2012
I need to take this string:
Dim tmpTry As String = "10, 20, 30, 40, 50, 52, 20, 20, 10, 35, 3, 8, 47, 7, 2, 5, 55, 8, 0, 0, 6, 55, 0, 2, 12, 0, 0, 21, 14, 0, 3"
And convert it to a double array:
Dim arrNumOfVisits As Double() = New Double(tmpTry) {}
How do i go about doing that?
FYI the arrNumOfVisits goes into a ParamArray System.Collections.IEnumerable()
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Mar 3, 2010
I am trying to convert a string to double and it is giving error. Bye the way it is not giving error on my PC but it gives on some pc's where other clients are using. String is retrieved from xml data.
<data><vitals>
<username>aiglemedia</username>
<balance>49.60</balance>
</vitals></data>
vb code
Dim curBalance As Double
xmlNode = xmlDoc.GetElementsByTagName("vitals")......xmlDoc contains the above xml data
curBalance = System.Convert.ToDouble(xmlNode.Item(0).Item("balance").InnerText)... I think so error is on this line.
Below is the link for the error given by the client who is using the app [URL]
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Nov 14, 2010
User enter a command like 2+2 and instead of displaying 2+2 in the designated textbox 4 appears.
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Jan 27, 2012
I am getting this error cannot convert string to datatable
The code is
dt = CType(Session("result"), DataTable)
I am trying to store the session value in dt which is a datatable. The session result contains string values.how to convert the session to datatable and store the session value in the datatable.
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May 7, 2012
I am using two textBox's. The first to enter the data. The second to convert to answer the program complies with no error, the debugger cannot convert data type from string to double.
[Code]....
why does the program not convert the textbox txtFahrenheit from string to double?
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Aug 18, 2010
Why is it that when I convert a string with value "22.882" to double, using Dbl() it loses precision and is converted to 2288.2?
I have to use a double since I'm using the constructor of System.Web.UI.WebControls.Unit[URL]..
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Aug 29, 2007
I can convert a string with no sign or with negative sign ("-" minus sign) into a double, but I cannot convert a string with positive sybmol/sign ("+" plus sign) into double. Considering the following samples:
Convert to string that has negative sign to double
Dim realnumber As Double
Sample 1. realnumber = Double.Parse("1.2345E05", NumberStyles.Any)
[Code]....
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Apr 26, 2012
I am finding difficulties to convert a datatable to a new datatable using a reference datatable. My question is confusing and I am not good at explaining things so I drew a picture (see below).I have two datatables on memory and I need to create the third datatable using the second mapping table for reference. The column names are just for example and it can't be hardcoded.
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Oct 5, 2011
Let's say I want to convert a Double x to a Decimal y. There's a lot of ways to do that:
1. var y = Convert.ToDecimal(x); // Dim y = Convert.ToDecimal(x)
2. var y = new Decimal(x); // Dim y = new Decimal(x)
3. var y = (decimal)x; // Dim y = CType(x, Decimal)
4. -- no C# equivalent -- // Dim y = CDec(x)
Functionally, all of the above do the same thing (as far as I can tell). Other than personal taste and style, is there a particular reason to choose one option over the other?
EDIT: This is the IL generated by compiling the three C# options in a Release configuration:
1. call valuetype [mscorlib]System.Decimal [mscorlib]System.Convert::ToDecimal(float64)
--> which calls System.Decimal::op_Explicit(float64)
[Code]....
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May 3, 2012
I am trying to convert an SMS to double. I'm creating a monitoring system where values like "45.2" are sent to another modem.
I would like to convert 45.2 (which I think is string initially and placed in a textbox) to double so I can do comparison upon receiving it.[code]...
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Oct 15, 2009
In my vb.net code, I had the following code:
[Code]...
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Jun 4, 2010
Follow-Up available: There's a follow-up with further details, see Convert MBF to IEEE.
I've got some legacy data which is still in use, reading the binary files is not the problem, the number format is. All floating point numbers are saved in MBF format (Single and Double). I've found a topic about that on the MSDN boards but that one only deals with Single values. I'd also would like to stay away from API-Calls as far as I can.
Edit: Just in case somebody needs it, here is the VB.NET Code (it's Option Strict compliant) I ended up with (feel free to convert it to C# and edit it in):
''' <summary>Converts a MBF Single to an IEEE Single</summary>
''' <param name="src">The MBF Single value</param>
''' <returns>The converted IEEE Single value</returns>
[Code]...
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Sep 23, 2009
Let just say I have an Integer like 10,000 (that's the VALUE in want to reach). So, I have another integer like 2500 (that's my current VALUE). Third I have another Integer about 350 PER HOUR. To reach 10,000 I need 7,500 (well I already have 2,500). How long must I wait to reach the 10,000 when the increase is about 350 a Hour. Okay, that's easy: 7,500 / 350 = 21,428571 Hours. BUT how can I convert this double to a timespan? Or how is it possible to add this double value to the current Date to get the Date + Time when I reach the Value?
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Apr 28, 2011
I have a value $17.50 as a string..how would i convert it to a double 17.50?
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Apr 12, 2011
I've been just making random programs trying to get the hang of the new language this time I was making a leap frog game where it switches back and forth beetween frogs every time a button is pressed. It also checks if the frog can land in the text box above the button pressed, if there is another frog there a message box will pop up saying sorry space is filled other wise the frog should land there.
[code]...
The error message says "Conversion from string "frog1" to type 'Double' is not valid." I understand what a double is but I've tried And If and that causes a bunch of errors.My Question is whats wrong with this cod and how can I make a double if statement???PS I did try to make an array to shorten this but thats in a different fourm will post URL later
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Aug 5, 2009
How to convert a binary stream (which is a string of numbers) into Double Array ? (VB.NET 2008)
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May 24, 2012
I have a piece of code:
Dim Latitude As Double = row("fltLatitude")
Dim Longitude As Double = row("fltLongitude")
Most of the lat/longs that are being fetched from the db using SP are retrieved in properly, except for a couple of records which do not include a period to indicate a lat/long value.I have tried using these:
Convert.ToDecimal(Latitude)
CDec(Latitude)
decimal.Parse(Latitude)
but none of them are working.
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Sep 3, 2011
how to convert a list of int to byte array in C#, but can't get syntax to work out for me in vb.Converting a list of ints to a byte array.
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Nov 26, 2009
I have read many posts on this topic; among them and most recently .NET - Convert Generic Collection to Data Table. Unfortunately, all to no avail.
I have a generic collection of structures :
Private Structure MyStruct
Dim sState as String
Dim lValue as Long
Dim iLayer as Integer
End Structure
Dim LOStates As New List(Of MyStruct) I need to fill a DataTable with this list of structures but have no idea how to go about doing this. I am using vb.net in Visual Studio 2008.
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Feb 10, 2010
I'm trying to convert DataTable to Linq using
DIm result = From r in dt.AsEnumerable()
Select new ( col1 = r.Field<integer>("id"), col2 = r.Field<string>("desc"))
But i get error near 'new (' saying type expected.
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Jun 22, 2012
I have seen many examples of populating a listview from a datatable or converting a datatable to a listview but what I am trying to do is exactly the other way around.
How can I convert/copy the contents of a winform listview to a datatable?
[EDIT]
I have a listview with a context menu where users can multiselect items and choose one of the context menu options, I then loop the selected items and extract each selected row (listview item) and serialize it, instead of doing this I wanted to convert the listview to a datatable then add the datatable to a dataset and serialize the dataset.
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Apr 28, 2012
convert a dataTable to List(of T).In Vb.net on .Net 3.5 If you know How To or maybe a link of somebody who did it.I check this on c# (from another stack question)
public static IEnumerable<T> ToEnumerable<T>(DataTable dt, Func<DataRow, T> translator)
{
foreach(DataRow dr in dt.Rows)
{
[code]....
but I cant translate Func on .net 3.5?
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Jun 20, 2012
I am trying to import a large array of integers stored as a csv file into a VB.Net DataTable called BeamMap. The .csv file consists only of integers, with a delimiter of ,, no quotes around the data (ie., 1,3,-2,44,1), and an end of line character of line feed and carriage return. All I want to do is get each integer into a DataTable cell with the appropriate rows and columns (there are the same number of columns for each row) and be able to reference it later on in my code. I really don't want anything more than absolutely necessary in the code (no titles, captions, headings, etc.), and I need it to be fairly efficient (the csv array is approx. ~1000 x ~1000).
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May 21, 2012
I managed to Convert a Datagridview to Datatable, Now problem is the programmatically addded Columns Seem to end up at the end of the of the initial table layout[code]...
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Dec 31, 2009
i am using following code to convert xml file to datatable but its just creating multiple tables (but without data) and i want tables with data..
Dim myDS As New DataSet
Dim xmlStream As System.IO.StreamReader = New System.IO.StreamReader(Server.MapPath("~xmldoc
esult_availhotel.xml"))[code].....
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