WPF Itemscontrol Binding - Control Doesn't Update And Shows The Same As Before
Feb 21, 2012
[Code]....
So i have that code in my xaml and the button gets filed with a list of string. Depending on what the users chooses on previous Usercontrol that item will be filed with differents items. The problem is if the user select one option at the first run the button will be filled correctly but if the user go back and select the other option the control doenst update and shows the same as before.. My english is not the best but i think i could made me understand! PS: the bindind on Button is to a readOnly property so i cant define it to Mode="TwoWay".. i took a look on the debug and the property ExportFormat gets updates with the new items but the usercontrol still displays the first option!!
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Feb 21, 2010
I have an ItemsControl in a ScrollViewer. The ItemsControl.ItemSource is set to the Observable Collection.Every time I add an item to the collection, my application nearly doubles in memory usage and eventually after enough adds.
Here is a rough sketch:
<Scrollviewer Name="MyScroll">
[code]....
Using ANTS Memory Profiler, I can see all the class instances in my App. When I start the program, I have 150 instances of TextBox (There are three in the datatemplate). When I add a studyunit to the collection, I have 303. Adding another leaves me with 456... 609... etc.The studyunit objects inherits from dependency objects and I am only binding to its dependency properties. I made the studyunit a series of dependency properties due to this article: [URL], but it didn't fix anything.Update 2/22/2010. Here is the actual code (code above was very simplified and created from memory)
Private Sub ObservableCollectionChanged(ByVal sender As Object, ByVal e As System.Collections.Specialized.NotifyCollectionChangedEventArgs)
If e.Action = NotifyCollectionChangedAction.Remove Then 'q removed
[code]....
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Feb 17, 2011
I've come across some strange behavior. I have a control that binds to a property like so:
<HyperlinkButton x:Name="ProjectBeheerLink"
Visibility="{Binding IsBeheerder, Converter={StaticResource VisibilityConverter}}"/>
In my viewmodel I have the property implemented like this:
Public ReadOnly Property IsBeheerder As Boolean
Get
Return iwtApp.AllMyFunctieRollen.Any(Function(x) x.Rol.Equals(Constants.RoleBeheerder))
End Get
End Property
Then when I raise my PropertyChanged event in my callback method
Private Sub GetMyPersonCompleted(ByVal lo As LoadOperation(Of FunctieRol))
'Init FunctieRollen ect. ...
RaisePropertyChanged(Function() Me.IsBeheerder)
End Sub
my binding does not update. However! If I implement a backend field like this:
_isBeheerder = iwtApp.AllMyFunctieRollen.Any(Function(x) x.Rol.Equals(Constants.RoleBeheerder))
RaisePropertyChanged(Function() Me.IsBeheerder)
And change my property like this:
Public ReadOnly Property IsBeheerder As Boolean
Get
Return _isBeheerder
End Get
End Property
Everything works fine...
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May 17, 2011
If I bind an BindingList(Of FooBar) to the datasource of my datagrid the controls gets updated whenever I add an item to this BindingList.[code]...
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Jul 2, 2011
Binding Master Table to TextBox and DateTimePicker and Binding Details Tables to Datagridview then Add / Update / Delete in both
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Aug 5, 2010
I am having trouble with some code I am writing to handle an Excel spreadsheet. The idea is that the dialog box is displayed which invites the user to select an Excel spreadsheet. Once they have done that, it is opened and a separate function checks to see whether Sheet1 exists returning Nothing if it is not found. The intention being the try/catch block picks it up and gracefully does nothing. The problem is that when the function returns nothing, the dialog box is still displayed and the sub doesn't seem to exit. [Code]
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Apr 24, 2012
I'm trying to set the tab order on my form and no matter what I do, it doesn't relearn the new tab position after I change the index. It almost seems like the form is locked.
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Feb 18, 2011
I am using an update panel and when I click a button it will update all the panels. updapanel1.update() is very simple, but my data is not updating unless I hit the button twice. My gridviews shows data for a selected user, and then all the grids reflect that users data. works fine all the update panels work for the gridviews. Now for somereason when i try to do a row count and update the panel with the summary, it does not work, i get either the previous users summary or if i hit update again for the same user i get the correct data.
[Code]...
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Jul 21, 2010
I have a gridview that is set to a sql datasource, it is generating the columns automatically. If I add a column to the table it is referencing, it will draw that column and display it, but it does not update the insert/update commands to include the new column. Is there any way have it rebuild those commands automatically?
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Nov 8, 2011
I'm using this
[Code]...
In FillDataGrid() is where I'm doing he binding - datagridview1.datasource = BindingSource1 - and adjusting the columns size, row colors, etc. What is happening is the following: the last item added to BetsL is being repeated in the datagridview, the other items doesn't appear. If I have 4 items to display on it, it only shows the last item repeated 8 times
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Nov 5, 2010
Public Sub UpdateStaff(ByVal sr As StaffRecord)
Dim oldSr As StaffRecord
Dim q = From staff In db.StaffRecords Where staff.Employee_Number = sr.Employee_Number Select staff
oldSr = q.First
oldSr.Address_Line1 = sr.Address_Line1
[Code]...
The helper function I have written seems to do everything I want apart from update the db. Stepping through the code, the oldSr is updated by the new sr parameter but no update on submit changes.
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May 27, 2010
[code]The query executes fine but the problem is that when this query executes, it doesn't update the percentage field. What might be the problem?
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Nov 23, 2009
I have a VB 2008 application with multiple DataPicker fields. The data is binded to SQL database. On the form load I set the checkBox for each date to false if there is no date in the field. Noticed that if I make changes to some dates for record 1 in the table, save it and scroll to the next record - I see the date that I just changed for record 1 - also on records 2 and 3. Why is it happening? I don't have that problem if I use text fields to display the dates. I had encountered the same problem with different project and just switched to text boxes. With this new project?
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Jun 22, 2011
I'm converting one of my projects with Option Strict On, but I get a failure which I can't seem to solve.
Option Strict On doesn't allow late binding:I'm loading a combobox with a particular field from a .sdf. When I select a value from the combobox it loads other values from the sdf, but I get the error when Option strict on.
[code]...
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Sep 30, 2010
I am really confused! My program doesn't work if I don't have Visual Studio here in my PC. To test it I have uninstalled Visual Studio. But my program doesn't work though Flash Player is present there (I have used Flash animation in the first form).
To be more sure about it I have installed Flash. But it's not working! That means the Flash animation file (.swf) is not making a problem! It needs support from Visual Studio to start. Doesn't it mean that some files are not attached with a setup file as a result it needs Visual Studio to run? Let me tell you how I create a setup file of my program.
CODE:
When I click on the icon of my program it shows the error message
CODE:
Reporting details: This error report includes information regarding the condition of WindowsApplication1. When the problem occurred the operating system version and computer hardware is use; your Digital Product ID, which could be used to identify your license; and the Internet Protocol(IP) anddress of your computer.
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Oct 20, 2009
I have a button inside of a gridview's template field. Onclick i want to the button to open up a modal popup while force updating the updatepanel and formview inside the modal popup because the formview's datasource depends on a hidden field in which i am setting after click also.
[Code]...
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Aug 16, 2011
I'm having a weird problem with a custom Web Control in an ASP.NET forms application. For a web application, I figured that it would save me a lot of time to create a class which inherits from CompositeControl which combines a label with some other control such as a TextBox or DropDownList. This composite control has several properties that wrap properties of the underlying properties (e.g.: EnteredText wraps TextBox.Text). The controls can be used for databinding in the same way as the regular ones, but instead of txtBox.Text = someObject.someProperty you use compositeControl.EnteredText = someObject.someProperty. These controls are then used on ASPX pages and ASCX user controls.
[Code].....
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Aug 6, 2009
Im working on in VB.net. Basically I�m trying to create a nice looking control that draws several PNG images (stars in this example) that light up as you hover the cursor over them. This side of things is working perfectly (see picture 1).
[URL]
The problem is trying to make it work using a transparent background for the control. I can make the control transparent by setting the controls back color and using Me.Setstyle to enable transparency support, but every time the image refreshes to show any lit stars it repaints over the stars again � making the shaded areas darker each time. This results in a horrible mess (see picture 2).
[URL]
Next I tried to clear the background each time a repaint occurs so that the stars are drawn on a blank canvas each time to stop this problem. The only way I know how to do this is to use graphics.clear(Color.Transparent) before my code to paint the star images. But this does not work as the control shows a black background instead of a transparent one (see picture 3)!
[URL]
away the background to leave me with a transparent canvas to paint images onto? And is anyone smart enough to come up with a solution to this irritating issue?
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Oct 27, 2010
I can't get my binding source to update from a DataGridView
This is how I'm loading the dataset into the dgv:
vb.net Dim sFileName = filelocation & "Checks.xls"
Dim connectionStringTemplate As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0;HDR=Yes;IMEX=1"""
Dim connectionString As String = String.Format(connectionStringTemplate, sFileName)
Dim sqlSelect As String = "SELECT * FROM [Sheet1$];"
Dim workbook As DataSet = New DataSet()
[Code]...
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Oct 11, 2010
I am using SQL Compact Edition and have a textbox binding to a dataset. When I enter something in the text box and try to update the datasource I get that the column Code in the datasource cannot be null. The textbox has a value so why is Code null?
Dim CONN_STRING As String = "Data Source=" & My.Settings.AutoCallPath & ";Persist Security Info=false;"
conn.ConnectionString = CONN_STRING
Dim myCommand As New SqlCeCommand("SELECT * FROM AutoCallDataTable", conn)
da.SelectCommand = myCommand
[code]....
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Aug 25, 2009
I have created a form that contains a DataGridView with data from a SQL Database. After viewing, the user will want to update checkbox fields in a single column of the DataGridView This action needs to update the SQL Database. I have set the "ReadOnly" to false on all the columns of the form and placed an "Edit" button on the form which changes the ReadOnly Property to True on the Column where changes would be allowed. How do I then set the binding to update the Sql with the changes made by the user?
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Mar 30, 2009
continuing on from my original post about datagridview.... [URL]
is there any working examples of implementing add/update/delete using the binding source?
i have a datagridview that has a bindingsource as its datasource and i am wanting to provide Add/Update/Delete functionality on the grid itself. Each record has a delete button which when clicked will remove the row and then add/edit is performed in the grid itself
the user then clicks a save/commit button that will then perform the nessecary updates on all rows
my initial plan was to have a copy of the data (iList) and then compare this to the contents of the binding source data to confirm whether to add/update or delete the record
also upon clicking the delete button i cant get it to remove the row from the datagridview. it thought i could do something like this...
Private Sub dgvDocumentTemplates_CellContentClick(ByVal sender As Object, ByVal e As DataGridViewCellEventArgs)
If (e.ColumnIndex = 6) And (e.RowIndex <> dgvDocumentTemplates.Rows.Count - 1) Then
[Code].....
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Jul 23, 2011
I am looking how to set events to a webrowser which is being created by the following:
[Code]...
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Jul 27, 2009
I have a manually created a dataset (dsPickingList) that I add data too as the user inputs data on a form. There is a datagridview on my form of which it's datasource is set to dsPickingList.What I would like to do is spot if a user deleteds a row from the datagridview and update the dataset (dsPickingList) as it is ultimatly this dataset that is stored to the db and printed, not the DataGridView.[code]This is why I need the action from the DataGridView to update the dataset
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Oct 12, 2011
Whenever I build my VB.Net project, the Assembly version does not automatically update as it is supposed to with the * in the third box in the Assembly Information. The only way I have found to (sometimes - it doesn't always work) get the version number to update is to Clean the Project, remove the *, Rebuild, reClean, put the * back in, and Rebuild again. What could be causing this issue to happen?
I should note that my coworker reports no such issue on his machine when Building the same Project; also, I must admit to some confusion on my part as to how this behavior is even possible, given that the error persists even if I remove every possible intermediate file I can think of that could possibly even be carrying the old version number, so how does it even know the old version number?
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Oct 24, 2011
I'm doing a form to add/edit/delete values from a data catalog. everything goes fine but the Radgrid doesn't update after Submit Button is pressed in the edit/new dialog. i did it before in a more complex form but i can't figure exactly what's wrong.
in the update the data where the new data will be overwritten dissapears after postback. (i have a way to solve this)
mnlib is a library of my authorship to deal with common tasks i know that queries with strings like {$database_name} is not a standart practice, and probably is not recomended, but i have to deal with it . i'm doing almost everything programatically some of the code is ommited because character limit in post Updated: Reduced code, i'm afraid if keep reducing code, i will eventually delete something important to the iusse
ASPX file
<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Templates/2Cols.Master" CodeBehind="lstCat.aspx.vb" Inherits="adquisicioneNET.lstCat" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
[Code]....
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May 14, 2011
I'm trying to update my database, I'm using access 2003, my problem is that for some reason I can update the first row but when I try to update any other rows after that I keep getting an error saying Column 'ProductID' is constrained to be unique. Value '7' is already present.
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Jan 3, 2011
Now it updates when I press the update button and then it displays the data like it has updated the database, but when I close the program and run it. It displays the data as not updated WHY DOESN'T THE DATABASE UPDATE?Same with the Add and delete commands, I've almost finished my program but there's always a problem :...
Dim StudentID As Integer = Me.Lst.SelectedValue
Dim con As New SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|StudentTeacherDB.mdf;;Integrated Security=SSPI")
[code]....
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Oct 15, 2010
With the DataGridView I'm used to just populate them with a list of some object, using the DataSource property. Now I want to just display properties from a single object, and I'm a bit confused on how to do it.. The object is updated through an API event, and I want to select some of the properties for displaying in the DataGridView, to look like this:.where "ValueX" is the name of the properties.Now, what would be my options for binding this to the DataGridView, such that property changes are automatically updated. Since an update also must invoke the control, does that mean I must reassign all bindings, or what logic is necessary in this case?
should I bind to an array, arrayList, stringList, dataTable etc? I guess I'm not sure which type of source will allow binding. Or if I should perhaps build the columns and cells of the grid and populate them "one-by-one" to the properties of the object?
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Aug 17, 2010
We have a issue with laptops for the current client in which IE continually shows prompts to users about working offline. The laptops are on a flaky wireless connection (Personally I would much rather fix this but they would much rather just fix this issue, apparently this works better money wise. I have my doubts).
Anyway the issue I'm facing is removing this box from opening at all.. Now there are two ways I can think of doing this. A possible Hook if it is available to catch it before it comes out and stop it. Or the less nice way is to when the box comes up to automatically hit the "try again" option using a sendkeys push.
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