Implement Extensive Data-Validation In MVVM?
Jul 14, 2011
Possible Duplicate:How can I handle a Validation.Error in my ViewModel instead of my View's code behind?The usual examples of how to use Data-Validation in WPF usually only involves defining an error template for the control and displaying the error message in the control tooltip. What I want to do is to create a collection of all ValidationErrors, display it in an ItemsControl to the user and focus the invalid control when the user clicks on the associated (error) item in the ItemsControl.
View 2 Replies
ADVERTISEMENT
Jun 15, 2010
I've built a UserRepository interface to communicate with my LINQ to SQL Data layer, but I'm trying to figure out how to implement validation.
Here is what my AddUser subroutine looks like
Public Sub AddUser(ByVal about As String, ByVal birthdate As DateTime, ByVal openid As String, ByVal regionid As Integer, ByVal website As String) Implements IUserRepository.AddUser
[Code].....
View 2 Replies
Feb 28, 2012
I have just started using MVVM design pattern with unity and I'm strugling to work out how you add a constructor.my code currently works if I comment out my constructor that requires input the view gets added to the shell.
Protected Overrides Sub ConfigureModuleCatalog()
MyBase.ConfigureModuleCatalog()
Dim moduleCatalog As ModuleCatalog = CType(Me.ModuleCatalog, ModuleCatalog)
moduleCatalog.AddModule(GetType(GridModule))
End Sub
how do I pass in variables into my GridModule ?
View 5 Replies
Mar 30, 2010
I'd like to implement some very simple validation into a program I'm writing, but I have no experience in this area, so I'm not sure how to implement it.I'd like one to have one make sure that text entered in to a text box has only regular characters (A-Z, a-z), but I'm not sure how to go about it!
View 3 Replies
Jan 4, 2011
How do i fill my ObservableCollection(of Monitors) with data so that I can save it in an MVVM friendly manner. I normally use a FileNumber to load a DataSet using a DataAdapter and pass the monitors table via monitorDT - should I be loading it differently? How do I save the changes? Right now I have the following for loading data:
[Code]...
View 1 Replies
Jan 13, 2011
How do i fill my ObservableCollection(of Monitors) with data so that I can save it in an MVVM friendly manner. I normally use a FileNumber to load a DataSet using a DataAdapter and pass the monitors table via monitorDT - should I be loading it differently? How do I save the changes?Right now I have the following for loading data:
Public Class Monitors
Inherits ObservableCollection(Of Monitor)
Public Shared Function LoadMonitors(ByVal monitorDT As DataTable) As Monitors
[code]....
View 3 Replies
Mar 23, 2012
I have been trying to do this for ages and having no joy whatsoever.
I have a ribbon window of the following hierarchy:
MainWindow
MainContent (Tab Control)
TabContainerViewModel
ViewModelBase
View model base has an ObservableCollection of tabs type ViewModelBase. The Tab Control itself is binding fine to these, displaying appropriate view models. I have 2 problems however, I want a "NotepadView" (Of type viewmodelbase) to be replicated numerous times (one view many view models).
At the minute, I have 4 views (NotePadViewModelx where x is 1-4) with corresponding viewmodels, this is because each view had the same text per tab. Now I have individual views per tab.
When I type into tab 1 and switch to tab 2, I lose what I typed in tab one when I click back.
View 2 Replies
Mar 29, 2010
I have a program that tracks packages. Shipment and package entities are persisted in SQL database, and are displayed in a WPF view. Upon initial retrieval of the records, there is a noticeable pause before displaying the new shipments view, and I have not even implemented the code that counts shipments that are overdue/active yet (which will necessitate a tracking check via web service, and a lot of time).I have built this with the Ocean framework, and all appears to be doing well, except when I first started my foray into multi-threading. It broke, and it appeared to break something in Ocean... Here is what I did:
Private QueryThread As New System.Threading.Thread(AddressOf GetShipments)
Public Sub New()
' Insert code required on object creation below this point.
[code].....
View 1 Replies
Dec 16, 2011
I created a class that I use for error logging. I have one method that accepts a parameter as an exception. With that exception, I created the error log and I write the message as well as the stack trace. With this, I'm finding that I'm not always getting detailed information. Usually, the stack trace shows me line number in which the error occurs, which allows me to pinpoint the issue.
[Code]...
View 6 Replies
May 11, 2012
I'm creating a program in VB.net that does the following:At a high level I receive a file in email, put the attachment in a monitored folder, import the text file to excel, format the excel, and then email the excel file to a list of recipients.
Here is my plan:
Completed: Outlook VBA to monitor all incoming email for specific message. Once message is received drop attached .txt file in a specific network folder.
Completed: (VB.net) Monitor folder, when text file is added begin processing
Not Complete: (VB.net) Import text file to Excel
Not Complete: (VB.net) Format Excel Text file.(add in a row of data,format column headers with color/size, add some blank columns, add data validation to some of the blank columns that allow drop down selections)
Completed: (VB.net) Save file.
Completed: (VB.net) Send file to list of recipients.
Obviously the items above that are not complete are the bulk of the work, but I wanted to get some advice on what some of you think would be the best way to approach something like this. The import and formatting of the file are causing me some problems because I just can't decide what would be the most efficient way to do this.
The way stated above. Import to excel -> format Having a template excel that contains all of the formatting already done for me and attempting to transition the data to this document (no clue if/how I can do this). Is it even feasible? Have the template already created and then import the text file to a new excel file, then transition that data to the excel template?
Something I thought about, in terms of formatting the document, was to record a macro of me doing all of the formatting that I'm going to need and then attempt to convert that macro into my vb.net code, but I'm not sure if that will work. I will need to verify that the text file comes in the EXACT format every time correct?
View 5 Replies
Aug 11, 2010
I have dragged across the details of a table from the data sources onto a form. So VS2008 automatically generate the BindingNavigator, DataAdapter,Dataset, ...etc. On the form I hv also placed an errorProvider and listbox, which is bound to the bindingsource. So as user clicks on the items of the listbox, the values of the textboxes changes accordingly. My question is how do I validate the values in the textboxes.
View 4 Replies
May 4, 2012
This seems like I only need a line or two of code? This is what I need to do:
Add data validation to the new phone field on the Contact Us form. We would only accept phones with the following format: 995-999-9999 Complete the contact us form so that you can submit it as an email. Send all your test emails to blah@boo.net. You can use any email account you have to send the email.
[Code]...
View 1 Replies
Nov 5, 2010
Add data validation to the new phone field on the Contact Us form. Wewould only accept phones with the following format: 995-999-9999Complete the contact us form so that you can submit it as an email. Send all your test emails to blah@boo.net. You can use any email account you have to send the email.
View 4 Replies
Feb 17, 2012
I have to use basic methods to validate the data that's entered is acceptable. The chapter we are on only gets into checking if a value is =, >, < etc etc, but I want to check if a letter was entered where a number was expected, so I ended up
with this:
'Store user values
If Not IsNumeric(inputLoanAmount.Text) OrElse CDbl(inputLoanAmount.Text) < 0 _
OrElse Not Integer.TryParse(inputLoanTerm.Text, loanTerm) _[code]....
View 4 Replies
Dec 7, 2009
I Have four textboxes, I want textbox1 to accept only char data.I want textbox2 to accept only numeric data.I want textbox3 to accept
View 1 Replies
Nov 10, 2011
I was having a little trouble using TryParse. I have 3 texts boxes that I just want to always be decimals and if false a message box will come up, but if true it will do nothing. Another thing was how can I just make it so one message box comes up because right now I have it split into 3
If Decimal.TryParse(TxtLoan.Text, decAmountInput) = False Then
MessageBox.Show("The data you enter must be positive, numeric data. Please re-enter valid date. ", "Invalid Data")
[code].....
View 6 Replies
Jul 1, 2009
Are there any examples on how to implement a datareader? I have try copying the code from MSDN but;--"Dim reader as SQLDataReader = command. ExecuteReader()"Where it is placed? As a declariton at the beggining of a form? or as as VB resource?and then how those it bind a to a dataGridView? How can I loop through each rows once is bind to use the contents of the column/row?I can perform the above function easly inside of MS Access using VBA. I have gone through various books from WROX but none of them show a clear example or the code is obsolete.
View 5 Replies
Feb 25, 2011
in the sense that MVC does not complain about my protected inner abstract Metadata class, and the model validation still works:
Partial Domain Object, generated by a tool:
Partial Public Class SampleDomainObject
Private _id As Integer
[code]....
I did this because I didn't want to have to implement actual properties with backing fields, getters, and setters in VB.NET for the Metadata class to keep the maintenance to a minimum (I'm on .NET 3.5, no auto-properties for me).What I'm worried about is that having a protected abstract inner class could be confusing to others using this domain object outside of MVC (my domain objects are part of a shared data access framework).
View 2 Replies
Jun 5, 2011
I have a huge amount of data in flat-file format that I would like to validate with Visual Basic 2010. Basically the data is a text file with 300 comma separated fields and 500,000 records.
Any tips, sample code or examples? Are any .NET classes specifically geared for data validation?
As I have different validation rules for each field (some fields are dates, some are currency, etc.) I would like to store the rules away from the code (e.g. in an SQL database table). Has anyone seen this done before?
View 1 Replies
Jan 31, 2012
What is the best method to do data validation? I want to do data validation when the user exits a control so that he gets immediate feedback. I can use the Validating event or the Leave event for that. The problem is, that if the user doesn't know the right answer, and just wants to click the cancel button and leave the form completely, it won't let him. It continues to give him an error message until he completely deletes his answer. Very frustrating. Does anyone have a good method for doing this?
View 5 Replies
Jan 24, 2010
How do you validate input when you are dealing with doubles. I have successfully gotten the message box to pop up when the user enters a number in a text field, but what if I have a text box that requests a number from the user and they enter text? This is the code, the even for btnDisplayFull works fine, but not btnDisplayRqst: [code]
View 2 Replies
Jun 22, 2010
I have four textboxes,
I want textbox1 to accept only char data.
I want textbox2 to accept only numeric data.
I want textbox3 to accept only alphanumeric data.
I want textbox4 to accept only bolean data.
View 2 Replies
Dec 2, 2010
Is there a dataannotation validate rule for a collection based property? I have the following
<DisplayName("Category")>
<Range(1, Integer.MaxValue, ErrorMessage:="Please select a category")>
Property CategoryId As Integer
<DisplayName("Technical Services")>
Property TechnicalServices As List(Of Integer)
I'm looking for a validator that I can add to the TechnicalServices property to set a minimum for the collection size.
View 1 Replies
Sep 29, 2011
I am testing custom data validation with partial classes. It is a Windows Form Entity Framework application .In the partial class file (time.vb) the code is:[code]What is wrong with my code? How can I handle the exception message in the main form (thrwon by the OnDataFundChanging event)?
View 3 Replies
Aug 24, 2011
I'm currently working on a data entry application in VB.NET and I'm using data-bound controls by simply dragging the table from the Data Sources window onto the form. It's my first time doing this, but this will save me quite a bit of time since this table has plenty of fieldsAnyway, my problem is that when I enter an invalid value in a textbox and then delete the text it won't let me select other controls or even close the form!
For example, say I have an Age field in the DB, which is an int and I mistakenly type "," on its textbox. Then I decide I actually want to leave that field blank (considering it allows nulls) so I just delete all of the textbox's contents, after doing so, I'm not able to switch focus to another control or close the form.
View 9 Replies
Apr 7, 2011
I am newbie in VS 2005 and started learning. Can you please tell me how to Pop up the data from a table when there is a key press in the textbox.
View 11 Replies
Sep 15, 2011
I want to build a form with fields bound to a datasoruce that the user can scroll through (using the up and down arrows).This would be a detail screen, but I don't really want a visible data gird or list on the screen with it, but as I'm still designing this may be something I would want to try also. The screen would be read-only data with a search textbox that would be used to query the list of data. The user will enter a search term and then browse through the detail screen to locate the exact record they want. I'm somewhat restricted on design because I'm trying to replicate a legacy program and don't want to deviate too far from the original design.For my datasource I've got a List (of MyClass), I just need to figure out the binding and navigation.
View 1 Replies
Apr 15, 2011
I'm looking for a reference showing how to implement linear regression on data in VB2005
View 1 Replies
May 28, 2009
In my app I have a main form listing basic customer info in a datagridview. When the user single-clicks a customer, I want all the customers info to appear on the right side of the main form for viewing/editing/deleting, etc. Also, if the user double-clicks a customer I want a new form to appear (not an MDI child, but an external form) to appear with the same info for viewing/editing/deleting, etc. (Kind of like MS Outlook where you can open an item in the main Outlook window or externally).Since the external form and the right side of the main form need to show the same info and have the same functionality, I created a User Control to house all the customers detail controls and the ability to edit or delete.
Questions: Is using a User Control the best way to go?
The customer data on the main form is brought in via dataset, tableadapter and bindingsource. When a user single or double clicks a customer, that customers ID needs to get to the details User Control, regardless of whether it's in the main form or external form. What's the best way to get that customer ID to the User Control? Or should the main form "pass" the data binding source to the User Control?Once the customer ID has been received in the User Control, what's the best way to show that customer's details and prepare it for editing?
View 6 Replies
Nov 25, 2009
Im trying to improve some apps ive written, the first is a console app... Im trying to get it so that i wont get an invalidcastexception if the user inputs a string, when the variable is type "Double"
[Code]....
View 2 Replies
