Disable a button in MVVM

Question

1.00/5 (1 vote)

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I have a button click event.

C#

private async void Start_Click(object sender, RoutedEventArgs e)
{
     try
     {
         Start.IsEnabled = false;
         Start.IsHitTestVisible = false;
         Start.Background = Brushes.Red;

The xaml:

XML

<Button Grid.Column="1" Grid.Row="3" Command="{Binding StartProcess}" Width="200">Start</Button>

Now I am going to use MVVM pattern then get rid of code behind, what is the code? Suppose use icommand.

Posted 1-Dec-14 8:56am

zhshqzyc

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Comments

syed shanu 1-Dec-14 23:39pm

Check this link Hope this will help you.
http://stackoverflow.com/questions/3476686/how-does-one-disable-a-button-in-wpf-using-the-mvvm-pattern

http://stackoverflow.com/questions/18372262/mvvm-enable-disable-button-with-a-converter

http://www.codeproject.com/Questions/179129/MVVM-Enable-Disable-button-via-a-PropertyChanged-e

[no name] 2-Dec-14 8:50am

I checked these links before and I know I have to use Property changed event something like. But I am just not sure how exactly to apply it to my issue. I need detail code.

Sergey Alexandrovich Kryukov 2-Dec-14 0:26am

There is no such thing as miracle: if you don't want to write code behind, your condition can be only as primitive as binding to some other property. Isn't that obvious? And what's your problem? Bind the property IsEnabled. To what? It's up to you.
—SA

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Member 10889447 · Accepted Answer · 2014-12-01T21:12:00

Solution 1

in your XAML

<Button Command="{Binding SomeCommand}">Do Something</Button>

C#

public class MyViewModel : ViewModel
{
    private readonly ICommand someCommand;

    public MyViewModel()
    {
        this.someCommand = new DelegateCommand(this.DoSomething, this.CanDoSomething);
    }

    public ICommand SomeCommand
    {
        get { return this.someCommand; }
    }

    private void DoSomething(object state)
    {
        // do something here
    }

    private bool CanDoSomething(object state)
    {
        // return true/false here is enabled/disable button
    }
}

Posted 1-Dec-14 21:12pm

Member 10889447

Comments

[no name] 2-Dec-14 8:47am

I know that I have to bind a property. The thing is I don't know how to apply it with PropertyChanged event. I need more code inside DoSomething method.

Member 10889447 2-Dec-14 21:38pm

Check this link Hope this will help you.

https://social.msdn.microsoft.com/Forums/vstudio/en-US/3acf2b83-3382-401e-ac02-0dfbc7561043/mvvm-refreshing-buttons-enabledisable-state

[no name] 3-Dec-14 8:46am

It won't help. I need the specific code for my case.