.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Register
 
Win Surprise Gifts!!!
Congratulations!!!


Post New Web Links

How automatically update a calculated property in wpf

Posted By:      Posted Date: September 15, 2010    Points: 0   Category :WPF
 
Hi, For example: I have a class MediaList with a list of mediaitems. (Movie, Serie, Season, Episode). All these classes have a property FileSize. So we get this structure: Movie has a property FileSize. Serie has a property FileSize and a property Seasons. Seasons has a property FileSize and a property Episodes. Episode has a property FileSize If have a calculated property FileSize on MediaList that i want to show. If one episode or movie is deleted, the parents fileSize needs to be updated until MediaList.FileSize is updated. What is the best practices to handle this kind of properties? Thx   


View Complete Post


More Related Resource Links

Automatically set a property value for a new record in a Dynamic Data application.

  

I have a SalesOrderItem table, and it has a UnitPrice column in case the salesperson wishes to override the unit price of the Product for that order item.

In an ASP.NET Dynamic Data application, what would be the best way to set that UnitPrice property on a new SalesOrderItem based on the standard UnitPrice for the product? In other words, when the user clicks New on the 'Items' screen for a sales order, the UnitPrice field should already be filled in with the normal unit price for the product.


This was originally asked by myself on StackOverflow at: http://stackoverflow.com/questions/3538234/automatically-set-a-property-value-for-a-new-record-in-a-dynamic-data-application


Changing a textbox's readonly property right before update on a gridview

  

I have a gridview with a date field. I don't want the user to be able to type in their own date and mess up the format so I made the property readonly. That date is then set by a point and click interface. This is all working fine but when the user clicks update this field doesn't update because it's readonly. If i turn readonly off it works so is there a way to turn off the readonly property right before submit?


how to get the css property updated along with update panel

  
I am using a update panel in my webpage. I am having a treeview in it . The css property of the Treeview before updating is different from after. Hw is it hapeening pls help i want to chagne it to the same css propertty as before its urgent 

Setting a Property that causes update on a UpadatePanel on Init stage.

  
Hi, I have a custom control with a UpdatePanel inside. Depending of user action or page programing I call Update method of my UpdatePanel to refresh html portion to user.For example, I created a property called Title. If the Title change i call Update of my UpdatePanel.public string Title { get { return labelTitle.Text; } set { if (labelTitle.Text != value) { labelTitle.Text = value; panelUpdate.Update(); // Refresh the entire control } } }   But if the Title property is configured on aspx file, my UpdatePanel is always refreshed because my Title property is setted on Init stage of page life cycle.I need to know if this property is setted on init stage or if ViewState is restored to avoid call Update, or any tips to avoid refresh my control everytime. Thanks,Tales Aguiar.

Approval Workflow does not update the Content Approval status if started automatically

  

Hi,

I’m using a simple Approval Workflow associated with Content Approval on site pages. It works fine when I set it to be started manually (by using Allow this workflow to be manually started by an authenticated user with Edit Item permissions  option) and on the completion of the workflow the Content Approval status is updated accordingly. But when I set it to be started automatically (by using Start this workflow when a new item is created  / Start this workflow when an item is changed options), it does not updates the Content Approval status. Note that I’ve set the Update the approval status after the workflow is completed (use this workflow to control content approval) option to true.

Regar

Approval Workflow does not update the Content Approval status if started automatically

  

Hi,

I’m using a simple Approval Workflow associated with Content Approval on site pages. It works fine when I set it to be started manually (by using Allow this workflow to be manually started by an authenticated user with Edit Item permissions  option) and on the completion of the workflow the Content Approval status is updated accordingly. But when I set it to be started automatically (by using Start this workflow when a new item is created  / Start this workflow when an item is changed options), it does not updates the Content Approval status. Note that I’ve set the Update the approval status after the workflow is completed (use this workflow to control content approval) option to true.

Regards

Approval Workflow does not update the Content Approval status if started automatically

  

Hi,

I’m using a simple Approval Workflow associated with Content Approval on site pages. It works fine when I set it to be started manually (by using Allow this workflow to be manually started by an authenticated user with Edit Item permissions  option) and on the completion of the workflow the Content Approval status is updated accordingly. But when I set it to be started automatically (by using Start this workflow when a new item is created  / Start this workflow when an item is changed options), it does not updates the Content Approval status. Note that I’ve set the Update the approval status after the workflow is completed (use this workflow to control content approval) option to true.

Regards

Unable to Set Control's Property After Update / PagePostBack

  

I'm trying to programmatically set the property of a control on my Form AFTER I've proccessed an update command using the FormView, but it's not working. 

In my example below, I have a basic FormView with only a TextBox and Label in its EditItemTemplate.  The FormView uses an AccessDataSource.  The TextBox is bound to the datasource, but the label is not.  What I'm trying to do is update the value in the TextBox (as well as its associated data stored in the database), and then change the Text property of the Label. (*Note: that I using the label purely as an example. The point is I can't see to set any control's property after an update).

I initally thought it had something to do with the "Page.IsPostBack", but even after trying to adjust my code for that, its still not working.

I've tried change the Text property during the Page.IsPostBack during Page_Load event. I've tried setting the Label's EnabledViewState property to True and to False. I've tried using the FormView's OnItemUpdating and OnItemUpdated events. I've tried using the DataSource's OnUpdating and OnUpdated events.

Nothing seems to work. Any suggestions?

Here's my sample code and Html:


<script language="VB" run

Force update of bound combobox when validation changes bound source property

  

.NET 3.5SP1, VS 2008

I have inherited a system for maintenance and I'm working my way through defect reports.  Once such issue involves insuring a combobox value is reset to a known good value when a validation failure occurs.  The combobox is bound to a source property loaded which is initialized when the user selects a case for update.  According to this post it is an issue inside of WPF to ignore value changes when processing an update to the source (at least that's how I interpret the post).  Unfortunately for me, the UpdateSourceTrigger for a combobox is PropertyChanged, so the suggested approach does not fit my needs.  I tried it anyway, just to be certain.

I've created a test app which mimics the application design and exhibits the behavior I'm attempting to work around.  At this point, I'm at a loss how to proceed further.  I'm certain there's something I'm missing and would appreciate a nudge in the proper direction.

xaml window:

<Window x:Class="TestWpf.ComboTest

CollectionViewSource sort not reflecting automatically after ObservableCollection item property chan

  

I use a CollectionViewSource to feed the Items of a ListView.  My CollectionViewSource is bound to an ObservableCollection that contains items that implement INotifyPropertyChanged.  Item property changes are being appropriately reflected in the ListView, but I'm surprised to find that the item does not automatically get resorted when its property that the sort is keying off of changes.  It would seem that all the information should be there for the ListView to recognize the need to resort the changed item.  Is there a way to make this happen or another 'lighter' alternative to calling Refresh() on the view?

 

Thanks!

 

mike


compare sortedlist object property changes and update value

  

 i have a sortedlist who values contain a Product objects. i wish to set the Quantity  property of a selected Product object                  ( from gridview) when the Quantity field changes?

how do i compare whether the product row Quantity field in the gridview is the same as the Product Quantity property  in the sortedlist and update accordingly?

note. i have converted to a list(of product) to bind to gridview. then update the sortedlist values


Property Evaluation Failed - SQL Update

  

Hi

I have a code block that contains around 320 lines of code. Everything runs fine when i debug it until i reach the section that updates a sql datasource. I am using:

 sqlDScc.UpdateParameters("friendlyName").DefaultValue = friendlyName
I have 38 lines of update parameters before i call the sqldscc.Update()
When i put a break point before the update parameters all the values are correct at the break point at the end all the values are "Property Valuation Failed"?
 
I'm not using any response.end, response.redirect or server.transfer.
 
Can anyone shine any light on this error. If it helps some of the code is:
 
            If InStr(strResult, "Success") Then
                sqlDScc.UpdateParameters("friendlyName").DefaultValue = friendlyName
                sqlDScc.UpdateParameters("noOfCalls").DefaultValue = noOfCalls
                sqlDScc.UpdateParameters("alert_active").DefaultValue = alert_active
                sqlDScc.Updat

Any way to automatically update/refresh Linq to SQL model?

  

If I make a change to my database (let's say I add a column to a table), is there any magical buttons that I can click to have my Linq to SQL model update to reflect the changes to my table?  I had to create two additional columns yesterday, and both times I found myself destroying and then recreating the Linq model.


Datagridview automatically update in c# by two Forms.

  

Hi to every body.

Note: I use Windows Application not Web Application.

 I am programming a database(Library database) program whit C# and SQL Server. I have a Tabel suppose that tblBook that show the information about my library books. I have a MainForm that have a Datagridview that linked to my tblBook and show my Books information that inserted in tblBook. in Main Form I have a Button that open another Form(Name is frmNewBook) for inserting information about a new Book in my tblBook. when I open frmNewBook by that Button and insert a new record at this time I want the Main Form automaticaly Update and the Datagridview show also new record information automaticaly by closing the frmNewBook Form or by Pushing the button(Save New Record.) that's my question.

 thank a lot Saeed.

 

 

Creating a Calculated property to an Entity

  

Hi there:

I want to add a calculated property to an entity.

I learned that if I create a partial class that extends the entity would suffice.

For example, I'm using the Northwind database, and I'm trying to add a totalAmmount property to Order Details, that should be defined as

UnitPrice * Quantity (let's skip Discount for simplicity).

Then I created the following:

public partial class Order_Detail : EntityObject {

   public double TotalAmmount {

      get {

         return this._Quantity * (double)this._UnitPrice;

      }

   }

}

But it is not working, I added it to a DataGrid and it didn't show any data. Could somebody tell me what I'm I missing?


How to update .edmx and domain service automatically? if any changes occur in View Table

  
Hi,



I have a Age_Group Table in which its values change frequently and even I created View table. Based on Age_Group Table row's value which represent as columns in View Table. If Age_Group row's value change, new row occur or delete the rows based on that the View table is displayed. I am taking these View tables in .edmx and set domain service for that .edmx.

My query are:

Can I update the .edmx and domain service automatically? if Age_Group row's value change.

If yes, please tell me the way.



Thanks,

ASP.Net Gridview Edit Update Cancel Commands

  
In ASP.Net 2.0, GridView Control also provides the functionality to edit and update the data retrieved from the database using CommandField template. You can cancel the action using Cancel Command of the CommandField. GridView consists of events that can be used to perform the actions like edit, update and cancel upon the Data items displayed in the ASP.Net GridView Data Control.
Categories: 
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend