Converter for Byte to Boolean (Checkbox)

Question

I have am working on Silverlight 4(Existing application) with the following requirement: Brief - Should have a search view where there is a checkbox to determine if it should return records according to 1 or 0 flag stored in a certain column - The backend part is working fine(retrieving data from a WCF service) - The problem I have is converting the Boolean Checkbox value from the front-end to the Byte value(1 or 0) sent to the WCF call that fethes the data I understand this is where a convertor would work. I did some of my own searching and found this: Silverlight Bind to inverse of boolean property value This worked brilliantly for DISPLAYING "Yes" for 1 and "No" for 0. But I am having problems with sending a checkbox True or False value which does the reverse conversion: i.e It sends to the object as follows: Checked = 1 Not Checked = 0 What I have done: - As an example, I have a table with User details as follows: ``` +----+----------+--------+ | ID | USERNAME | ACTIVE | +----+---…

Accepted Answer

The implementation of your Converter is not correct. You have to swap the implementations of the `Convert` and `ConvertBack` methods.

The `Convert` method converts a value from your ViewModel to a value for the View and the `ConvertBack` method converts a value from the View to a value of the ViewModel.

So in your case with using the Converter in the Binding of the `IsChecked`-Property of the CheckBox the `Convert` method gets a Byte value and converts is to a Boolean, while the `ConvertBack` method gets a Boolean and converts it to a Byte.

```
public class BoolToByteConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null)
            return false;
        else
            return System.Convert.ToBoolean(value);
    }

public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return value != null ? System.Convert.ToByte(value) : 0;
    }
}
```

Converter for Byte to Boolean (Checkbox)

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