.net - Unable To Filter WPF BackgroundWorker ListView
Jul 8, 2009
I have a WPF ListView that I am trying to filter within a BackgroundWorker. My code is shown below:
Dim Worker As New BackgroundWorker
AddHandler Worker.DoWork, AddressOf Me.FilterAsync
Me.TextBoxText = Me.TextBox.Text
Worker.RunWorkerAsync(Me.TextBox)
[code]....
This code runs through the filtering however it fails with an error "The calling thread cannot access this object because a different thread owns it." on the following line:
ListView.Filter = New Predicate(Of Object)(AddressOf Me.FindItemsAsync)
What would be the problem here? I can't seem to find any samples with filtering through the BackgroundWorker.
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Apr 27, 2010
My application has to do a lot of work when I press as single button. When he is doing this he got to changes sometimes a few tings in a textbox. Sometimes the calculation can take more then 10 - 15 minutes, is there any way to make it doesn't say not responding? And you are able to work further in the program. I did try backgroundworker but I'm not able to edit the textbox.
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Sep 8, 2010
I'm using a vb.net backgroundworker thread for processing and I need to periodically add items to a listview (with multiple columns) during the thread processing.I can easily use the following code for delegating the task to add an item to a listview, but I can't figure out how to additional info to other columns on the same row.he thread, I'd execute the following to trigger the invoke to add to listview:AddListItem(ListView1, filepath)Here is the delegate code, if someone can show me how to add the t
Delegate Sub AddListItem_Delegate(ByVal [Label] As ListView, ByVal [text] As String)
Private Sub AddListItem(ByVal [ListView] As ListView, ByVal [text] As String, Optional ByVal [text2] As String = "")
[code].....
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Oct 21, 2011
I'm trying to create a Report. In my Solution I have a form with Report Viewer in it, a RDLC file and a DataSet. When I run the solution the report is populate OK no errors. I would like the User to be able to filter the DataSet so only the required data will populate the report. My DataSet contains the following columns Customer, Address, Orders. I have tried the following code but the Report is not filtered nor I get any errors.
[Code]...
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Feb 6, 2012
I have 2 Form, form1 and form2, there are listview in form1 and there are backgroundworker in form2, I trying to add Items to listview in form1 with backgroundworker in form2, but when I run the backgroundworker, nothing happen with listview, but its work when I am not using Backgroundworker in form 2_load
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Jan 7, 2011
Here's my code :
VB
'Clearing the selected items of the listview
ListView1.SelectedItems.Clear()
'Random selection of farms from the listview
Dim random As New Random()
Dim rand As Integer = random.[Next](0, ListView1.Items.Count)
[Code] .....
I'm running it under a BGW and it works fine but is there anyone who can comment on it and make my code a bit better. I've a background worker and I am running it again and again on the RunWorkerCompleted like this
VB
Private Sub BGW_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BGW.RunWorkerComplete
BGW.RunWorkerAsync()
End Sub
Is it bad coding or is there any alternative to run it?
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Dec 9, 2009
I am using the following code to filter on a textbox value using the BindingSource.Filter function.I thought this was the right code based on my many searches.
BindingSource1.Filter = "ValueID = '%" & ValueToFilter.Text & "%'"
When do a debug, it shows the correct value which is "432360ac-ac35-4101-8d46-f2cbd5b5dc52.There are spaces in the end of this value and it is exactly the same in the SQL database with the spaces. ValueID is a column in my SQL server. It does not filter the records in my dataset.I tried replacing the ValueToFilter.Text with my actual value as shown above including the space at the end and it filters the records just fine exactly as I want it to. Although I obviously need it to work for multiple values from my SQL server.
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Nov 30, 2009
I'm trying to add information to a ListView from a BackgroundWorker thread. I thought I could do this in this manner:
vb.net
Private Delegate Sub _ListView(ByVal lvi As ListViewItem)
Public Sub test(ByVal lvi As ListViewItem)
[Code].....
When I attempt to run the "test" sub the BackgroundWorker, I get an error:
Argument not specified for parameter 'lvi' of 'Public Syb test(lvi as System.Windows.Forms.ListViewItem)'.
Is there something I need to specify when declaring the sub, or in the sub itself?
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Sep 20, 2009
I'm using the following to check the state of checkboxes and then activate some public subs based on the checked state of the checkboxes:
vb.net
Public Sub TestSub() If Me.CheckBox1.InvokeRequired Then Me. CheckBox1.Invoke(New MethodInvoker(AddressOf TestSub)) Else Begin() End If End Sub
Within the Begin sub, I have code that performs specific actions and then updates a ListView with that information.As far as I can tell, the actions are being performed, but the ListView isn't being updated with the info.I'm calling the Test sub from a seperate form, within the BackGroundWorker's DoWork event.Would I have to check the InvokeRequired property of the ListView as well?I'm looking more into the documentation of the BackGroundWorker.
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May 9, 2011
Can someone point me out a way to add items to listview cotrol from a backround worker, I've searched the web for a way to do this but with no success
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Apr 14, 2009
I want to use the filter element that is defined in CSS in order to render some PNGs for use in IE6. Using VS 2008 and creating a style sheet in the Studio I noticed that when I wrote the word filter, it was not recognised by intellisence. Is there a bug in VS 2008? How can I make my app recognise filter? I really need to use this command word in order to render my transparency correctly
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May 21, 2010
I have a problem to implement action button to execute bat file . I am using SharpDevelop Version : 3.2.0.5698 . this code looks like :
Sub Button3Click(sender As Object, e As EventArgs)
Shell(Environ$("CONFIG") & "wpis_v3.bat")' TODO: Implement Button3Click
End Sub
in wpis_v3.bat I have :
@echo off
%DIR%instatus.bat >> %DRIVE%users
eport.txt
status.bat launches script to check license availbilty on the server and write it to report.txt ... by launching just wpis_v3.bat it works . report is generated with all information about licenses . But when I launch from VB icon - report file is generate but is total empty . I observed that with any bat which contains >> VB doesn't write into file. Is there other way to acchive it ? I would like that VB will show only specific lines from this report.txt - which contain string : "Site" and other "Client" .
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Apr 4, 2012
I want to filter data on the textchange event on listview so I use dataview to filter data. Issue in the below code is, I use dataview inside for each so that it checks only one condition that is last value only it takes, I want to check value in s1 with dataview and remaining value should bind with listview. E.g.: if I type an in textbox it should list all the item values starting with an value like anandha kumar, anna etc. Suppose I keep the value anandha kumar and anna in array s1. I should list all other values expect the array values like antony etc... in listview.
protected void TextBox1_TextChanged(object sender, EventArgs e) {
dvProducts = (DataView)Session["ListViewItems"];
string serachText = EscapeLikeValue(TextBox1.Text);
string lvValues = hdRetailCustomerGroup.Value;
string trim = lvValues.Replace(" ", "");
[Code] .....
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Nov 10, 2009
I'm having a little trouble trying figure out a way to filter specific file formats to only show in a Listview. For example I only want .txt files to show in a Listview and no other file formats. Is this achievable?I've had a look around the net but not found anything relevant to what I am trying to achieve.
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Feb 15, 2012
I Have Listview with All transaction with column InvoiceNo Date Customer Total
Now I want to filter only month transation only month with combobox selection and one textbox year
Me.cboMonth.Items.Add("1")
Me.cboMonth.Items.Add("2")
Me.cboMonth.Items.Add("3")
[Code]...
How can I selection cboMonth to filter only month transaction
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Apr 24, 2011
This is my line of codes. but it only compares to the equal match on the textbox. is there any way where i can match even just a keyword and will select all items with the same keyword that i type on textbox.[code]...
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Sep 12, 2011
I have a listview and a textbox under it. Whenever a user input's text, I want the listview to filter. The code I have works, but the listview doesn't load the filtered data. I think it's because the listview has 2 columns of data that it's loading. [Code]
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Sep 14, 2011
i have a listview in virtual mode loaded via the cachevirtualitems and etrievevirtualitem. now i want it to be filtered as we type in the textbox...Please suggest as to where to filter this...here is the code used to load the items...
Private Sub ListView2_CacheVirtualItems(ByVal sender As Object, ByVal e As System.Windows.Forms.CacheVirtualItemsEventArgs) Handles ListView2.CacheVirtualItems
[code]....
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Feb 9, 2012
I want to display the result in listview that i written in the texbox
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Sep 17, 2011
In stead of using Datagrid for filtering and importing - listview for filter and import can it be possible?
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Jan 18, 2012
HOW TO SEARCH or FILTER MYSQL DATA IN TEXT BOX & WILL DISPLAY TO THE LISTVIEW
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Dec 14, 2009
in my button click event i ececure
If BackgroundWorker4.IsBusy Then
BackgroundWorker1.CancelAsync()
End If[code]....
after proceess completed if press the button again.i got the following error msg
This BackgroundWorker is currently busy and cannot run multiple tasks concurrently.
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Mar 18, 2009
I am trying to filter the first column of a listview which holds date values. If the date is less than 21 days from today it deletes the row from the listview.
[Code]...
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Dec 15, 2009
I have a datagridview with 2 columns, 1 is Batch_Number and another is Existing_Stock, there is about 6000 rows.My question is, I want to be able to write in a TextBox and hit a Search Button to search the Batch_Number column and filter out or highlight the row with the matching number to see the Existing_Stock
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Jan 18, 2011
I have a form (in visual studio 2008 vb.net) with 1 listview and i want to see a arrow when i make sort. I have finhsed with the sort code but i am unable to see the up or down arrow. I have try the
[Code]...
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Apr 28, 2011
I have a Listview and a button like this
Below is the code I have used for deletion of Data from Listview
Private Sub btnDelete_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDelete.Click
If lvNotesList.SelectedItems.Count > 0 Then
[Code]....
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Apr 29, 2011
I'm trying to use a custom listviewitem class that attaches additional information to a lisview item. Here is the class:
Public Class albumListViewItem
Inherits ListViewItem
Public hash As String
[code]....
When I try to cast a listviewitem to my custom class like this:
Dim albumItem As albumListViewItem = CType(lsvHidden.items.item(0), albumListViewItem)
I get the following error, "Unable to cast object of type 'System.Windows.Forms.ListViewItem' to type 'AudioMatic.albumListViewItem'."
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Jul 7, 2010
I have created a Dictionary class (MyDictionary for the example). I am currently trying to pass MyDictionary into a function, filter it into a new instance of MyDictionary and pass this new instance into another method. When I am attempting to create the second instance from the filtered first instance of MyDictionary via Lambda Expressions and the ToDictionary Method, I am getting the following error:
Unable to cast object of type 'System.Collections.Generic.Dictionary`2[System.Int32,System.String]' to type 'MyDictionary'. I have simplified the example and recreated it in LINQPad and am getting the same error.
Here's the simplified version of my code:
[Code]...
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Feb 15, 2012
I m trying to filter a sql db with many filter criteria which inert the user in textboxes .. i ve tryed this query
[Code]...
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Mar 20, 2009
I am trying to filter the results of a datagridviw using the bindingsource.filter method.
Dim filters(2) As String
...
If Me.txtPartIDFilter.Text = "" Then
[code]....
The issue is in the last line. ID_Part is an Int64 data type filters(0) is a string so the system returns a "Can't perform 'Like' operation on System.Int64 and System.String" error message.As you can see I tried converting the data type, but that failed since it is encased in String.Format()- it's going to be a string no matter what, I suppose.It's almost 1:00 a.m. so I'm not firing on all cylinders.
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