/// <summary>
/// Evaluates the path or xpath specified in a <see cref="BindingExtension"/> to a property of the assigned DataContext of the supplied <see cref="BaseMap"/>.
/// </summary>
/// <param name="src">The supplied source object, usually the DataContext of a <see cref="BaseMap"/> derived element.</param>
/// <param name="bindingExtension">The binding on which the source object</param>
/// <returns>The evaluated value</returns>
private static object Evaluate(object src, BindingExtension bindingExtension)
{
if (src == null || bindingExtension == null)
{
return(null);
}
try
{
if (!string.IsNullOrEmpty(bindingExtension.XPath))
{
return(GetPropValueFromXPath(src, bindingExtension.XPath));
}
else
{
return(GetPropValue(src, bindingExtension.Path));
}
}
catch
{
// Really, should raise some sort of error as the property path is invalid on a null - but this is what WPF bindings do...
System.Diagnostics.Debug.Print("Map.EvaluatePath failed: {0}, Source={1}", bindingExtension, src);
return(null);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="BindingContainer" /> class.<br/>
/// No public ctor. Can only create from a binding using Create.
/// </summary>
/// <param name="binding">The <see cref="BindingExtension"/> which this container will used to evaluate and store values.</param>
private BindingContainer(BindingExtension binding)
{
if (binding == null)
{
throw new ArgumentNullException("binding");
}
this.binding = binding;
this.evaluatedResult = new UnevaluatedBindingResult();
}
