C# - How To Convert Listview To DataTable

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?


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.


Asp.net - Extract/convert Information From A Listview (to A DataTable)?

Jan 4, 2010

I have a relatively simple Listview that suddenly needs (due to new requirements) to have it's 'layout' extracted to a DataTable so that a common routine can convert it to an Excel spreadsheet for export purposes.The ItemTemplate is just a series of Table Rows with some text, data-bound labels and textboxes with validators in the cells.Usually, when trying to pull out a particular value (like what was entered into a text box), I use the ListViewItem's .FindControl method.

For Each objItem As ListViewItem In lvwOptions.Items
Dim objTextHrsLabor As TextBox = CType(objItem.FindControl("txtHrsOptByLabor"), TextBox)
decHours = CDec(objTextHrsLabor.Text)

In this case, however, I'm trying to take all the data displayed - all the 'rows and columns' of the table that was created.Inside the ForEach / Next loop of ListViewItems, I started a ForEach/Next loop of Controls for each instance's controls but I got some really strange results returned (like controls that had a couple of table cells in them).

I get the sense I'm headed in the wrong direction. All I want is for the nicely-formatted 5-line, 6 column table to be converted to a 5-line, 6-column data table.

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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
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public static IEnumerable<T> ToEnumerable<T>(DataTable dt, Func<DataRow, T> translator)
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When I do this, it does not seem to work, as the table remains empty. If I do the conversion in the same function, it works fine.

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Dim dt As New DataTable
With dt


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How do i populate datatable with listview. . . .i have tried this code but it doesnt give the items that contained in listview to datatable. .

dt.Rows.Add(ListView1.Items("Quantity"), ListView1.Items("Description"), ListView1.Items("Price"), ListView1.Items("Total"))

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I am getting this error cannot convert string to datatable

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dt = CType(Session("result"), DataTable)

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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
Dim ds5 As dataset1.DTSUMDataTable = TA5.GetData(users)
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Error:Conversion from string "fld_primary" to type 'Integer' is not valid.

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In datagridview .DataSource how about in listview ?

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'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'heres the code i'm using[code]....

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Here is all the code i have so far, I need to Average a column in my datatable from what i have read "Compute method supports expressions and they support CONVERT function that you could use inside of the expression."


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I'm pulling data from a D3 database, using an api.

The api can do the following: Dim OBJ As Object = mvsp.MVResultSetGetRows.ToArray()

But how do I get that data into a datatable to use as the datasource for a DataGridView?

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Mar 6, 2009

i've created a new access 2007 database + added a OLE Object field, that i've then pasted images into.

in vb2008 i've connected to the database + put the table into a datatable. so far it works ok.

when i try to convert the byte array to an image, it causes an error:

'A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll'

heres the code i'm using:


Dim arr() As Byte = DirectCast(record.Item(5), Byte())
pic.Image = Image.FromStream(New IO.MemoryStream(arr))

its loading the byte array properly, but the Image.FromStream line causes the error. i've used this method before with an earlier access database + it works.

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function UpdateProductTable() {
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Jul 18, 2012

I have a listbox that calculates interest rates the code is as follows:-

dim amount as double = val(textbox2.text)
dim counter as integer
for counter = 1 to 10
listbox1.items.add(counter & " % " & formatcurrency((amount*counter)/100))
next counter

This works great but i would like to use a listview with two columns. 1 for the counter percentage .2 for the amount calculation.I have tried but am getting stuck with the subitems.

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Dec 20, 2010

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'If (listbox1.SelectedIndex <> -1) Then _


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May 9, 2011

I have an object called Result<T> that has a constructor which accepts an argument of IEnumerable<T>. I'd like to be able to pass in a datatable if possible.

I tried datatable.AsEnumerable(), but where I bind to the data it was complaining that 'MyProperty' is not a field or property on type 'DataRow' - which makes sense since 'MyProperty' isn't a property on 'DataRow', but it was a column in my datatable.Is there a way to convert a datatable to something that I can pass into the Result object and still have it bind to, say, a gridview?

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I am trying to display value of the field ("UserID") for every row exists in datatable to checkboxlist(make the checkboxlist item selected).

I used for loop, but only the field value from last row of RoleUsers table is selected in the checkboxlist.

Here is my code

Private Sub DisplayRoleUser()
Dim conn As SqlConnection
Dim cmd As SqlCommand 


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I 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

Friend Function CreateTable(ByVal tableName As String) As Boolean
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this however produces the following error on line 3


System.ArgumentException was unhandled Message=DataTable 'get_item_list' does not match to any DataTable in source.

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Apr 16, 2012

I 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]...

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Field Staff 2
Accountant 3
Manager 4
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Resource Hours Used
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For Each rowWork In foundRows

"LineOfBusiness = 'CPP'"

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