Wpf xaml when I click edit it checks if combobox value is null or not. How to disable combobox if value is not null

Question

0.00/5 (No votes)

See more:

C#

private CarType _inspectMethod;
    
    public CarType InspectMethod
    {
    
            get
            {
                return _inspectMethod;
            }
            set
            {
     
                _inspectMethod= value;
                RaisePropertyChanged();
                
             if(InspectMethod!= null)
                {                    
                    InspectTypelist = InspectMethod.InspectType;
                }
    }   

    <Label Grid.Row="0" Grid.Column="0" Content="value:" />
   <ComboBox Width="Auto" Grid.Row="4" Grid.Column="1" SelectedValuePath="Id" 
    DisplayMemberPath="Name" SelectedItem="{ Binding ElementName=LayoutRoot, 
    Path=DataContext.InspectMethod}" ItemsSource="{ Binding 
    ElementName=LayoutRoot, Path=DataContext.InspectMethodList}"/>

What I have tried:

C#

bool _isEnable;
 public bool IsEnable

        {
            get
            {
                return this._isEnable;
            }

            set
            {
                this._isEnable = value;
            }
        }

 <ComboBox Width="Auto" Grid.Row="4" Grid.Column="1" IsEnable="Binding something here" SelectedValuePath="Id" 
    DisplayMemberPath="Name" SelectedItem="{ Binding ElementName=LayoutRoot, 
    Path=DataContext.InspectMethod}" ItemsSource="{ Binding 
    ElementName=LayoutRoot, Path=DataContext.InspectMethodList}"/>

Posted 7-Nov-18 16:11pm

JimB_

Updated 7-Nov-18 21:02pm

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

M.Kamran Asim · Accepted Answer · 2018-11-07T21:02:00

What do you mean by combobox value. do you mean enable-diable combo box has list of items or not. If this is the case, you can use following code

C#

public class ComboBoxEnableConverter : IValueConverter
   {
       public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
       {
           bool hasItem = (bool)value;
           if (hasItem)
               return true;
           return false;
       }
       public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
       {
           throw new NotImplementedException();
       }
   }

Then Add to Resource and bind to Enable property as given below

XML

<UserControl.Resources>
        <common:ComboBoxEnableConverter x:Key="EnableConverter"/>
</UserControl.Resources>

<ComboBox x:Name="cmboBox" IsEnabled="{Binding ElementName=cmboBox, Path=HasItems, Converter={StaticResource EnableConverter}}"/>

1. Define converter if you want to convert source value into target e.g items count to boolean (IsEnable on accepts boolean)
2. Bind IsEnable property to your requirement. In this example I want to check if combo box has some items in item source. if yes, Converter will return true, else false