VS 2010 Get A Subset Of Into Another DataTable?
May 19, 2011I have a DataTable that I need to get a subset of into another DataTable to bind to a control. Is there an easy way to do this?
View 4 Replies
ADVERTISEMENT
Get Subset DataTable From Main DataTable, But Preserve Primary Key & RowErrors?
Apr 16, 2012I came across a problem with using a BindingSource as my DataGridViews.DataSource. Whenever I applied a filter to a column in the BindingSource and the user makes changes that don't match the column filter the DataGridViewRows would automatically disappear. A similar thing would happen when applying a Sort to a column. If the user made any changes the DridGirdViewRows would automatically sort causing rows to be moved around. This was not ideal for my application and there isn't anyway to stop this from happening with the BindingSource.
To correct this issue I have to use subsets of data. I use a DataView to apply the filter and sort to the main DataTable, which creates the subset DataTable.The problem is when I use the DataView.ToTable method I loose the Primary Key and RowError information. So I have to reapply this information everytime the user filters or sorts the DataGridView.Is there a better way to get a subset DataTable?[code]...
VS 2010 : System.ArgumentException Was Unhandled Message=DataTable 'get_item_list' Does Not Match To Any DataTable In Source
Apr 21, 2010I am working on a project that takes an xml schema and xml data files and places them into a DataTable, the 2 files are generated from a working table that i have written to disk. I wish to load these 2 files into a DataTable. Here is What i have
vb.net
Friend Function CreateTable(ByVal tableName As String) As Boolean
Dim table As New DataTable(tableName)
table.ReadXmlSchema(tableName & ".xsd")
[code]....
this however produces the following error on line 3
Quote:
System.ArgumentException was unhandled Message=DataTable 'get_item_list' does not match to any DataTable in source.
get_item_list is the parameter passed into this function (tableName)
VS 2010 Datatable - Summarize Multiple Occurrences Of An Item In A Datatable
Jun 5, 2012I have a datatable that has a resource in one field and hours used in another, it looks like this -
Resource Hours Used
Manager 1
Accountant 1
Field Staff 2
Accountant 3
Manager 4
Manager 1
Administrator 6
Field Staff 4
Manager 0.5
Administrator 1
What I want to do is be able to create a summary of the data table above that groups multiple occurrences of a resource and adds up the hours used for that resource, creating a summary that looks like this -
Resource Hours Used
Manager 6.5
Accountant 4
Field Staff 6
Administrator 7
Getting Value From Subset Of Arraylist?
Mar 5, 2012how to achieve what am trying to do below. am trying to have a set of numbers in different list into and array. so i can select any list in the array as random and get the values in the selected list.
Dim list1 as New List(Of Object)
Dim list2 as New List(Of Object)
'adding items to list 1
[Code]....
.Net Linq - Doing Operation On The Subset
Jun 16, 2010I need to have the following : (name1 + "a") + (name2 + "a") + ...
Dim separator() As String = {"|"}
myString.Split(separator, StringSplitOptions.None).SomeLinq(...)
I don't know what to add at the end to add an "a" to each element...
C# - SQL To Filter A SubSet Of Data?
Jun 2, 2010I have an arraylist that holds a subset of names found in my database. I need to write a query to get a count of the people in the arraylist for certain sections i.e. There is a field "City" in my database from the people in the arraylist of names I want to know how many of them live in Chicago, how many live in New York etc.
how I might set up an sql statement to handle this. I think somehow I have to pass the subset of names to sql somehow.
Here is a sample how I am writing my sql in my code
Public Shared Function GetCAData(ByVal employeeName As String) As DataTable
Dim strQuery As String = "SELECT EMPLID, EMPLNME, DISP_TYPE, BEGIN_DTE FROM Corr WHERE (EMPLNME = @name)"
[Code]....
I need a way to create a function using your sql statement to return a datatable object of names and the parameters would be city, and the List of names.
The above example isnt the sql I am looking for its just a skeleton of what the function would look like that I want to create.
So then you would use the function by iterating through all the cities passing in the same set of names each time in the fron end.
Output Each Subset Of The List
Feb 16, 2011I have a list and I need to output each subset of the list for example a b c d e would output to
[Code]...
I believe the correct term is combination no element should be duplicated on the same line I was going to attempt this with a series of loops but im not even sure wehre to start
Search Through A Subset Of Properties For A Given Value?
Aug 12, 2010I am working with the MP3IDV1 class from this link: [URL] I am pulling the ID3 tags from music files, and this class returns the Genre in number form. However, it has the property Genres with that entire list.
Public
Enum
Genres As
[Code].....
Bind Gridview To Subset Of Array?
Dec 9, 2010I have an array of objects I get from a web service. The 1st element in that array is meant to be displayed in a asp.net literal control. The rest of the elements are meant to be bound to a gridview.
View 1 RepliesC# - Get Subset Of Elements After Performing Remove()?
Jun 21, 2009If I have code like this (C# or VB.Net does not matter)
Dim e As IEnumerable(Of XElement) = _
From s In _dataSourceSettings.Elements _
Where s.Attribute("name").Value = toInsert.Attribute("name").Value
If e.Count > 0 Then
e.Remove()
End If
How do I get now new _dataSourceSettings without element that I removed?
Code To Find Subset Of String
Aug 22, 2011I am working on a function that returns an array of variable-length strings that have a certain starting and ending delimiter. The input to the function is a string. I am able to do this by using if-then statements with InStr(). I was wondering someone knew of a more elegant way. I tried using the split command but I am splitting on one delimiter so I don't really get the result. I could then parse from the results but I am back to the same boat with using InStr().
[Code]...
Pass Subset Of An Array To Function?
Jun 25, 2010I have a simple VB.Net Form that acts as an interface to a control library with a public API.
One of the API calls takes an Array of UIntegers ByRef:
Public Function Get_Values(source_id As Byte, first_value_address As Byte, number_of_values As Byte, ByRef valuesOut As UInteger()) As Integer
After the call, valuesOut will hold a list of values number_of_values long from source_id starting at first_value_address.
There is a hardware driven limitation that the max number of values returned is 15 regardless of requested length. I need to get 28 values into an array from my VB.Net code.
Is it possible to send only part of an array variable to the function similar to this C code?
uint[28] values;
Get_Values(0, 0, 15, values);//get first part
Get_Values(0, 15, 13, &values[15]); //get second part of data
Filtering Array To Return Subset Of Elements In .Net 2.0
Mar 2, 2011I have the following in a .Net 2.0 app:
Private chequeColl() As Cheque
For i = 0 To m.Length - 2
chequeColl(i) = New Cheque()
[Code]....
I now want to make chequeColl only contain those items where Status is not equal to 41. In LINQ this would be easy but I can't think how to do it.
I cannot use the .Net 2.0 LINQ bridge products, I have to do this the old school way. At the end of it chequeColl must only contain those items that are not status of 41. I cannot have empty elements.
Get A Subset Of Unique Values In Column(1) Of A DataView?
Dec 16, 2009Is there a way to get a subset of Unique values in column(1) of a DataView?
View 6 RepliesSelect Subset From DataSet And Display In DataView?
Nov 3, 2009I have populated a dataset from a text file and I can display it in a dataview. Can I and if so how do I, select a sub set from this dataset and display it in the dataview?
View 4 RepliesWhy Isn't The Counter In For Loop Increasing Once For Each Found Subset
Nov 26, 2011The program is to take an entered string then search for a subset of letters entered through and input box.In my subprocedure Sub btnSearch_Click I am using a loop to move through the entire length of an entered string to search for a set of letters entered through an input box. I can find the set of letters to search for but instead of increasing my counter "Found" for every instance of a match it returns the length of the string instead. I just don't know why the IF doesn't prevent the counter from increasing for every element in the string. I want the counter to increase only when the match is found. I just put 2 message boxes in there to make sure it found the right letter and then display the counter.
Here's the entire
' Name: Count Project
' Purpose: Displays the number of times a sequence of characters
' appears in a string.
[code]....
IDE :: Horizontal Slider Bars - Fit A Regression To A Subset Of Data
Jan 18, 2010I have a set of x, eg 288, data values. The user wants to fit a regression to a subset of this data, eg (2 - 200), then she wants to analyse within a subset of this fitted range, eg at 20 and 100. So, on my form are four Hor. Slider Bars, to set the lower and upper bounds to the fitting and the analysis. The two that set the lower bounds work fine. The two that set the upper bounds are getting corrupted somehow outside of my code and I do not know how to solve this problem. What happens is that when I click on the right hand arrow on the slider bar, the program runs through my function with the correct values whilst the arrow is down, goes out of my code and then immediately comes back into my code, but with the wrong value set into the Hor. Slider Bar fields that I am working with, eg the .Value field. The new value is always 9 below the maximum that it can be, but I can see no connection to this number.
View 1 RepliesIo - Proper Way To Commit A Subset Of A Byte Buffer To File?
Dec 7, 2011I am concerned that this code is copying bytes into a temporary buffer before writing directly to file.
I feel like there should be some method of copying bytes directly from the tail end of the main buffer directly to file.'this code copies all bytes starting at integer index from the main buffer into a new file: ga.exe
'declare temporary buffer
Dim EXEBytes(bytes.Count - index) As Byte
'copy subset of bytes over, starting at index
System.Buffer.BlockCopy(bytes, index, EXEBytes, 0, bytes.Count - index)
'write bytes from temporary array into file
File.WriteAllBytes(Server.MapPath("/BIN/ga.exe"), EXEBytes)
Returning Subset Of Dictionary With A Complex Type As A Key With Linq
Oct 5, 2010I have a collection as follows
Private _bankRates As Dictionary(Of RateSourceBank.Key, RateSourceBank)
Where RateSourceBank.Key is simply
Public Class Key
Public RateType As String
Public EffectiveDate As DateTime
[Code].....
Create A .net Chart Object With A Series Based On A Data Subset?
Apr 8, 2012I'm working in VS2010 on a visual basic application. It takes in serial port data, writes it to an access database, and then graphs the data.The data only comes in once every minute, so it's not like I'm building an oscilloscope. Right now, the chart is reading from the database using a table adapter and graphing just fine, so long as I keep the number of records in the database low.If I add too many records to the database, the chart shows a red "X" through it. I've played with changing the axes, but it is still a problem.I don't really need to graph the whole database.The twenty most recent records would suffice.How can I make a chart series with only a small subset of the database in it.Perhaps it cold be populated with a query?
View 1 RepliesVS 2010 : Add New Row To Blank Datatable?
Mar 24, 2011I try to view a datagrid with one empty row in it when the form loads. The datagrid has to be bound to a datatable all the time.I get a NullReferenceException with the following
Dim dt As DataTable
dt = CType(Me.grdDataGrid1.DataSource, DataTable)
Dim newrow As DataRow = dt.NewRow()
newrow(0) = 1100
dt.Rows.Add(newrow)
The error occurs on the line where dt.NewRow() is used.The problem occurs when the datatable (and the datagrid) is empty. If they have data, this works ok.What do I have to do to get this to work with empty datagrids?
VS 2010 DataGrid & DataTable?
Mar 17, 2011I have a DataGrid that a user is sorting, problem is that the sorted results are not being updated in my DataTable (which makes another function fail later). I have tried calling AcceptChanges() after the sort is done, but that isn't updating the DataTable. dtMessage.AcceptChanges()How can I have the DataTable updated after the sort to diplay what is displayed in the DataGrid ?
View 2 RepliesVS 2010 DataTable Control
Sep 10, 2011When I dispay data sets in a Datetable control. It started with showing the focus on first cell ( i.e. cell(0,0)). How can I set the initial focus to other cell (say cel(3,4))?
View 2 RepliesVS 2010 Delete A Row In Datatable?
Dec 10, 2009I have a listbox connected to a datatable. When i click a button, the marked item should get deleted. How?
View 5 RepliesVS 2010 SQL Datatable Error?
Mar 22, 2012I have an sql database with multiple tables. I have been adding new columns to one of the tables as I need them, but now suddenly it has stopped allowing me to add columns.Everything works as usual until I add the 150th column to the table. When I drag the table from the server explorer to the dataset designer i get the following error:"Some updating commands could not be generated automatically. The database returned the following error: Dynamic SQL generation is not supported against a SelectCommand that does not return any base table information.If I remove the 150th column, everything works great. I tried using the wizard to regenerate the select and update statements, but it fails with the same error.
View 5 RepliesVS 2010 : Convert Datatable To JSON?
Mar 26, 2011I want to be able to turn a datatable or dataset or the results of my SQL queries into JSON - purpose is for a WCF service which will not do it.
View 2 RepliesVS 2010 : Save Image To Datatable?
May 11, 2012I have picturebox that the user can import an image, and then save it to the datatable. I can save it with no problem, and the image, which is a logo, will populate onto my crystal reports pages.My issue, is that I want the logo to automatically load into the picturebox when the user opens my settings form. How can I do the opposite of the following:
'set the company datatable for sub
Dim borrowersrow As PlannerFilesDataSet.CompanytableRow
'use only the first row
[code]....
VS 2010 Add And Configure A DataTable To Project?
Dec 10, 2009Is it possible to add a Datatable to the project, add columns to it, and then add rows with data in it that i can use in my project?
I need to store some data in my program and i thought the best way was a datatable, but i also need to add some data that exists in it when i build my pogram.
VS 2010 Adding ArrayItems To Datatable?
Jul 20, 2010I have an array which holds the following items
for example
Quote:
myArray(0) = (1)
myArray(1) = (4,2)
myArray(2) = (10,15,20)
[Code]....
and then am trying to add other column based on items available in myArray().