Bind a values from code behind to xaml page

Logeswari Jegatheesan

9y1.5k

XAML

Here I created a listbox which is add a listitems from combobox at run time. In data template contains two textblock, one textblock display a values from combobox which is selected by the user, the other textblock used to display a hour value which is in code behind file.

code behind file(c#)

private void dispatcherTimer_Tick1(object sender, EventArgs e)
{
if (dispatcherTimer1.Interval == TimeSpan.FromSeconds(15))
{
//lstbxindex.Items.Add(lstbxindex.SelectedItem.ToString());

// string hourvalue = Convert.ToString(hrvalueinitially);

obj = new Roundedhour();
obj.hourvalue = Convert.ToString(hrvalueinitially);

roundedhourvalue = obj.hourvalue;

this.ItemsSource = obj;
//this.DataContext = this;

//lblprojectAhr.Content = string.Join(",", hrvalueinitially + "" + "hr");
}

}

Roudedhour.cs(c#)

public class Roundedhour
{

public string hourvalue { get; set; }

public override string ToString()
{
return string.Format("{0}", hourvalue);
}

}

}

6 Replies

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Logeswari Jegatheesan9y ago
I'm new to wpf. I really appreciate your help.Thanks a lot for that. but I am sorry because I am not get what I expected.
Rafnas T P9y ago
change Roudedhour.cs(c#) as below and try
public class Roundedhour
{

private string var_roundedhourvalue;
public string roundedhourvalue
{
get
{
return var_roundedhourvalue;
}
set
{
var_roundedhourvalue = value;

}
}

}
Logeswari Jegatheesan9y ago
Hi,

I got the error In output(Debug)

System.Window.Error 40 : BindingExpression path error: 'roundedhourvalue' property not found on 'object' ''String' (HashCode=1515547959)'. BindingExpression:Path=roundedhourvalue; DataItem='String' (HashCode=1515547959); target element is 'TextBlock' (Name=''); target property is 'Text' (type 'String')
Rafnas T P9y ago
hi ,

I think you have to use observable collection to bind like below
private void dispatcherTimer_Tick1(object sender, EventArgs e)
{
if (dispatcherTimer1.Interval == TimeSpan.FromSeconds(15))
{

ObservableCollection<Roundedhour> MyCol= new ObservableCollection<Roundedhour>();

MyCol.Add(new Roundedhour()
{
roundedhourvalue=Convert.ToString(hrvalueinitially);
});

}
}

Roudedhour.cs(c#)
public class Roundedhour
{

public string roundedhourvalue{ get; set; }
public override string ToString()
{
return string.Format("{0}", hourvalue);
}

}

}
Logeswari Jegatheesan9y ago
Thank you so much, But the values cannot bind to the textblock.

public class Roundedhour
{
public string Hourvalue { get; set; }
public override string ToString()
{
return string.Format("{0}", Hourvalue);
}
}
public ObservableCollection RoundedHour
{
get { return Hourvalue; }
set { Hourvalue = value; }
}

///

/// Every 15mintues it will show the rounded hour
///

///
///
///
private void dispatcherTimer_Tick1(object sender, EventArgs e)
{
if (dispatcherTimer1.Interval == TimeSpan.FromSeconds(15))
{
obj = new Roundedhour();
obj.Hourvalue = Convert.ToString(hrvalueinitially);
roundedhourvalue = obj.Hourvalue;
this.DataContext = obj;

}
}
//Initially the hour value is equal to zero
double hrvalueinitially;
///

/// check the condition the item is selected in listbox or not
/// if it is selected, start count the timing
/// Every 8 mintues hour value increment 0.25
/// Check the selected projectName Changed or Not
/// if it changed previous selected projectName their Mintues values stored into the databaseTable.(storedMin() Method)
///

///
///
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
int value = lstbxindex.SelectedIndex;
//check the listbox items is selected or not
if (lstbxindex.SelectedIndex > -1)
{
if (dispatcherTimer.Interval == TimeSpan.FromSeconds(3))
{
double hrvalue = 0.25 + hrvalueinitially;
//hrvalue = Convert.ToDouble( RoundedHours)+0.25;
//double hourval = hrvalue;
//lblprojectAhr.Content= hrvalueinitially;

hrvalueinitially = hrvalue;

}
}
Asish Mohapatra9y ago
Hello,

Please find the solution where i created a combobox and listview.
On selection of combobox you can insert an item to listview and also one more item from the code behind.

Bind the selectedItem to a property in viewmodel and then on set of the property update your collection.Make sure that your collection is Observable collection or implements INotifyCollectionChanged if its a Custom collection.