/// <summary>
/// Returns the current value of a property given a notification that
/// it has changed.
/// </summary>
/// <returns>The current value of the property</returns>
public static TValue GetValue <TSender, TValue>(this IObservedChange <TSender, TValue> This)
{
TValue ret;
if (!This.TryGetValue(out ret))
{
throw new Exception(String.Format("One of the properties in the expression '{0}' was null", This.GetPropertyName()));
}
return(ret);
}
internal static IObservedChange <TSender, TValue> fillInValue <TSender, TValue>(this IObservedChange <TSender, TValue> This)
{
// XXX: This is an internal method because I'm unsafely upcasting,
// but in certain cases it's needed.
var ret = (ObservedChange <TSender, TValue>)This;
var val = default(TValue);
This.TryGetValue(out val);
ret.Value = val;
return(ret);
}
/// <summary>
/// Returns the current value of a property given a notification that
/// it has changed.
/// </summary>
/// <typeparam name="TSender">The sender.</typeparam>
/// <typeparam name="TValue">The changed value.</typeparam>
/// <param name="this">
/// The <see cref="IObservedChange{TSender, TValue}"/> instance to get the value of.
/// </param>
/// <returns>
/// The current value of the property.
/// </returns>
public static TValue GetValue <TSender, TValue>(this IObservedChange <TSender, TValue> @this)
{
TValue ret;
if ([email protected](out ret))
{
throw new Exception($"One of the properties in the expression '{@this.GetPropertyName()}' was null");
}
return(ret);
}
