How to get time only from DateTime in wpf?

Question

I have this method which is meant to parse and get the time that the user types in the textBox in WPF.
It should then add a string like '12:05' as a value to one of my selected items.

   private void addInterviewTime(object sender, RoutedEventArgs e)  
           {  
               ShortlistedClient sc = dgr.SelectedItem as ShortlistedClient;  
     
     
               if (sc != null && DateTime.TryParseExact(textBox.Text, "HH: mm", out TimeOnly result))  
               {  
                   sc.DT = result;  
               }  
     
           }  

It gives the following errors:

   // for this line, if (sc != null && DateTime.TryParseExact(textBox.Text, "HH: mm", out TimeOnly result))  
   Error	CS1501	No overload for method 'TryParseExact' takes 3 arguments  
     
   // and for	 sc.DT = result;  
     
   Error	CS0029	Cannot implicitly convert type 'System.TimeOnly' to 'System.DateTime?'  

I have also tried

   if (sc != null && TimeOnly.TryParseExact(textBox.Text, "HH: mm", out TimeOnly result))  
               {  
                   sc.DT = result;  
               }  

and it still gives

   Error	CS0029	Cannot implicitly convert type 'System.TimeOnly' to 'System.DateTime?'  

Previously, I have set my DT property like this in my ShortlistedClient class:

   public class ShortlistedClient : Client, INotifyPropertyChanged  
       {  
           private DateTime? _dt;  
     
           public DateTime?  DT  
           {  
               get { return _dt; }  
               set { _dt = value; NotifyPropertyChanged(); }  
           }  
     
           public bool InterestedinVac { get; private set; }  
           
     
           public List<ShortlistedClient> clients { get; set; } = new List<ShortlistedClient>();  
           public ShortlistedClient(string n, string p, string e, string l, string wt, string q, string we, string dl, string cc) : base(n, p, e, l, wt, q, we, dl, cc)  
           {  
               DT = new DateTime();   
               InterestedinVac = true;   
           }  

how can I have time only and fix these errors?

Answer 1

Hi, @Maria . Welcome Microsoft Q&A.
According to the documentation DateTime.TryParseExact, there is no overload for DateTime.TryParseExact that takes 3 parameters.
You could modify the code as follows.

 if( DateTime.TryParseExact(textBox.Text, "hh:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime result))  

I made a sample code according to your description, you can try to refer to it.

MainWindow.xaml:

   <StackPanel >  
        <TextBox x:Name="textBox" Height=" 50" Width="400" Background="AliceBlue" Text="{Binding Txt ,Mode=TwoWay ,UpdateSourceTrigger=PropertyChanged}"/>  
        <DataGrid  x:Name="dgr" ItemsSource="{Binding Datas}" SelectedItem="{Binding Selected}" AutoGenerateColumns="False">  
            <DataGrid.Columns >  
                <DataGridTextColumn Header="InterestedinVac" Binding="{Binding Path=InterestedinVac}"/>  
                <DataGridTextColumn Header="Date" Binding="{Binding Path=DT}"/>  
            </DataGrid.Columns>  
        </DataGrid>  
        <Button x:Name="btn" Click="addInterviewTime"  Height="50" Width="400" Content="click"/>  
    </StackPanel>  

Codebedhind:
272403-new-text-document-9.txt

----------------------------------------------------------------------------

If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.