Simple MVVM Pattern in WPF

Thank you so much! This is a great example of how not to make examples. The code does not work already at the View level.

Hi Kumar, nice code! Better than any MS course!Something important is missing in your instructions: in app.xaml you has to change the StartupUri="View\MainWindow.xaml", otherwise it will not find the window.

Can I get a copy of the source code?

How could you manage to insert and update in one command? here is just update example ..what if I want to add a record by using same inputs and one Save button ?

Thank you for providing a ballast-free example! There is a typo in the XAML in line 31. Command="{Binding Path=UpdateCommad}" must be UpdateCommand.

Hi Raj,Greate article ! If you can implement / point out / update the article with the comments below: - Remove StartupUri="Views/MainView.xaml" from App.xaml - there is a typo in "UpdateCommad" which should be "UpdateCommand". (UserView.xaml) would be nice !

Anyway to download the complete example?

There's conflict between city and country on selecting item, just replace and it'll be solved

I believe this "WpfMVVMSample.MainWindow window = new MainWindow(); " should be replaced with this "MainPage window = new MainPage();" in the last function/method you provide named "protected override OnStartUp"

To make it work, StartupUri="View/MainWindow.xaml" should be removed in order to use OnStartup method. And there is a type in "UpdateCommad" which should be "UpdateCommand". If those are changed, it'll work well.

Hi, It seemed that the code doesn't work correctly. Any click on any button triggers the change of the ListView. When I add an other button on the window, even if without Command Property, it trigger too the binding on the ListView...

No use of the Update button! and spelling mistakes. it would be an improved one.

I can replicate the window but the style of the interface is different - how do you achieve the windows style aesthetic?

Getting two windows.please help

<Application x:Class="StduentMVVM.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Startup="Application_Startup" xmlns:local="clr-namespace:StduentMVVM" StartupUri="MainWindow.xaml"> <Application.Resources> </Application.Resources> </Application>

Great article, thanks. One issue is that the path in Command="{Binding Path=UpdateCommad}" path is wrong, it should be UpdateCommand and not UpdateCommad (missing an n). Once you fix that, all the Command routines will be called

I can't see list user when I run app

What is the procedure if we want to update our data on SQL Database when we click on Update Button?

It didn't work for me either found a post that said check 'App.xmal' properties and change "Build Action" to "Application Definition", It worked when I rebuilt it.

OnStartup method not required in App.xaml.cs, just put StartupUri="View/MainPage.xaml" in App.xaml

Two windows open on start up

Raj Solve my Problem

It did not work.Can you please provide the zip code with solution ?It may help me to find the solution

It did not work.Can you please provide zip file with solution?

How to Dynamic Drop Down In MVVM

It did not work for me until I removed StartupUri from App,xaml. And be careful with the namespaces. Remove Update button as it is useless. This will cause confusion whoever is trying to learn mvvm

Great. Working Flawlessly.I am just edited instead of calling onstartup I call it in MainWindow like private void UserViewControl_Loaded(object sender, RoutedEventArgs e) { MVVM_WPF.ViewModel.UserViewModel UserViewModelObject = new MVVM_WPF.ViewModel.UserViewModel(); UserViewControl.DataContext = UserViewModelObject; }

Getting error on base.OnStartup(e); :(

good one

It's very helpful example for Beginners. Thank,s.

Thanks raj. It very useful to me.

Can you please provide zip file with sloution, so that i can download it

one of the best example.

Plz Raj I can't seem to override the window in the view folder please upload the sample project

thank you...Its very Helpful For Beginners in MVVM..

Thanks raj. This is very helpful for me. Can u explain why other empty window will open.

Good article, very helpful........its not working for me , kindly please priovide the code ...and Please clarify: there is mainpage.xaml .....but its written to add a window.....Plaese help on this ... will be pleased with ur timely help

What hari told is correct. Then what is purpose using Icommand feature, inotifypropertychanged and update button without these things it works fine.

nice example about binding but not implement Icommand feature and Update button it is just for a show, it works all because of binding and of event trigger at lost focus , select user then change name and click on next textbox the data in grid will be changed , no use of update button, anyway thanks bro.

Could you share your solution here please. For some unknown reason the listview does not load the 8 sample data

Nice simple and clear example

Nice Good Example

fantastic example for beginners. Thanks

where is the method and code require to update?

what I am looking for is not there.without update button click I change some properties, then change the selection to other one, without update button it change? how to overcome this?

Nice good example

nice article, thanks so much...

Super article and this is the first time i am feeling comfortable with the MVVM pattern . Slight modifications are required to run this project. As like change the App.xaml file's , this is needed StartupUri="View/MainPage.xaml"> and inside the App.xaml.cs change the code to MVSample.View.MainPage window = new MVSample.View.MainPage(); MVSample is the project's name, so give your project name to that palce that will be yourprojectname.View.MainPage window = new yourprojectname.View.MainPage();

very nice article bro..thanx so much..

If you want to get this working. Follow the instructions below: Create a WPF application Create the three folders Then move the MainWindow.xaml in to the view folder Then go through the tutorial as above. There isn't really a need for the MainPage.xaml to get this to work. This is a very good article and has given me a good understanding of the MVVM Pattern.

Little bit mistaken. Do as I followed. In MainPage.xaml wite code as below: <Page x:Class="WpfDemo.View.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" xmlns:VM="clr-namespace:WpfDemo.ViewModel" xmlns:View="clr-namespace:WpfDemo.View" d:DesignHeight="450" d:DesignWidth="600" Title="MainPage"> <Page.DataContext> <VM:UserViewModel/> </Page.DataContext> <Grid Margin="0,0,0,20"> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> <RowDefinition Height="Auto"/> </Grid.RowDefinitions> <ListView Name="UserGrid" Grid.Row="1" Margin="4,220,12,13" ItemsSource="{Binding Users}"> <ListView.View> <GridView x:Name="grdTest"> <GridViewColumn Header="UserId" DisplayMemberBinding="{Binding UserID}" Width="50"/> <GridViewColumn Header="First Name" DisplayMemberBinding="{Binding FirstName}" Width="80" /> <GridViewColumn Header="Middle Name" DisplayMemberBinding="{Binding MiddleName}" Width="80" /> <GridViewColumn Header="Last Name" DisplayMemberBinding="{Binding LastName}" Width="100" /> <GridViewColumn Header="City" DisplayMemberBinding="{Binding City}" Width="80" /> <GridViewColumn Header="State" DisplayMemberBinding="{Binding State}" Width="80" /> <GridViewColumn Header="Country" DisplayMemberBinding="{Binding Country}" Width="100" /> </GridView> </ListView.View> </ListView> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="80,12,0,0" Name="txtUserId" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=UserGrid,Path=SelectedItem.UserID}" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,42,0,0" Name="txtFirstName" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=UserGrid,Path=SelectedItem.FirstName}" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,73,0,0" Name="txtMiddleName" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=UserGrid,Path=SelectedItem.MiddleName}" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,107,0,0" Name="txtLastName" VerticalAlignment="Top" Width="178" Text="{Binding ElementName=UserGrid,Path=SelectedItem.LastName}" /> <Label Content="UserID" Grid.Row="1" HorizontalAlignment="Left" Margin="5,12,0,274" Name="label1" Height="28" VerticalAlignment="Top" /> <Label Content="Last Name" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="5,107,0,0" Name="label2" VerticalAlignment="Top" /> <Label Content="Middle Name" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="4,74,0,0" Name="lblMiddleName" VerticalAlignment="Top" /> <Label Content="First Name" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="5,40,0,0" Name="label3" VerticalAlignment="Top" /> <Button Content="Update" Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="310,45,0,0" Name="btnUpdate" VerticalAlignment="Top" Width="141" Command="{Binding Path=UpdateCommad}" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,191,0,0" x:Name="txtCity" VerticalAlignment="Top" Width="178" Text="{Binding SelectedItem.City, ElementName=UserGrid}" /> <Label Content="Country" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="4,0,0,211" x:Name="label2_Copy" VerticalAlignment="Bottom" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,134,0,0" x:Name="txtCountry" VerticalAlignment="Top" Width="178" Text="{Binding SelectedItem.Country, ElementName=UserGrid}" /> <Label Content="City" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="5,132,0,0" x:Name="label2_Copy1" VerticalAlignment="Top" /> <TextBox Grid.Row="1" Height="23" HorizontalAlignment="Left" Margin="102,165,0,0" x:Name="txtSTate" VerticalAlignment="Top" Width="178" Text="{Binding SelectedItem.State, ElementName=UserGrid}" /> <Label Content="State" Grid.Row="1" Height="28" HorizontalAlignment="Left" Margin="5,163,0,0" x:Name="label2_Copy2" VerticalAlignment="Top" /> </Grid> </Page> In MainWindow.xaml write code as below: <Window x:Class="WpfDemo.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vm="clr-namespace:WpfDemo.ViewModel" xmlns:vw="clr-namespace:WpfDemo.View" Title="MainWindow" Height="450" Width="600"> <Grid> <vw:MainPage Grid.Row="0"/> <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" VerticalAlignment="Bottom" ResizeBehavior="PreviousAndNext" Height="5"/> <vw:MainPage Grid.Row="2"/> </Grid> </Window> in App.xaml write code as below: <Application x:Class="WpfDemo.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="View/MainPage.xaml"> <Application.Resources> </Application.Resources> </Application> so you can see result as given here

Not working ..............

Just wasted half hour trying to figure out what it should be doing... Shame, this looked like what i needed to get a high level view on mvvm, but it seems it was thrown together without testing it. It's okay until you add the page called MainPage.xaml to the view folder, but not sure what is supposed to happen then. Is the xaml added to that new page or to the MainWindow.xaml, from your code it has been added to MainWindow.xaml and not MainPage. In which case what does MainPage.xaml have to do with anything. Unfortunately confusing and not working as displayed,

Thnx Dude..! for your valuable work to explain things precisely. TC