/// <summary>
/// Evaluates the specified expression in the context of specified control.
/// </summary>
public object Evaluate(ValueBindingExpression expression, DotvvmProperty property, DotvvmBindableControl contextControl)
{
var visitor = EvaluateDataContextPath(contextControl);
// evaluate the final expression
EvaluateBinding(visitor, expression.Expression, expression.GetViewModelPathExpression(contextControl, property));
return visitor.Result;
}
public void ThisBinding()
{
var dataContext = DataContextStack.Create(typeof(string));
var binding1 = ValueBindingExpression.CreateThisBinding <string>(service, dataContext);
var binding2 = ValueBindingExpression.CreateThisBinding <string>(service, dataContext);
var binding3 = ValueBindingExpression.CreateThisBinding <object>(service, dataContext);
var binding4 = ValueBindingExpression.CreateThisBinding <string>(service, DataContextStack.Create(typeof(string), dataContext));
var binding5 = ValueBindingExpression.CreateThisBinding <string>(service, DataContextStack.Create(typeof(string), dataContext));
Assert.AreEqual(binding1, binding2);
Assert.AreNotEqual(binding1, binding3);
Assert.AreNotEqual(binding1, binding4);
Assert.AreNotEqual(binding2, binding3);
Assert.AreNotEqual(binding2, binding4);
Assert.AreNotEqual(binding3, binding4);
Assert.AreEqual(binding4, binding5);
}
/// <summary>
/// Evaluates the PropertyInfo for the expression.
/// </summary>
public PropertyInfo EvaluateProperty(ValueBindingExpression expression, DotvvmProperty property, DotvvmBindableControl control, out object target)
{
var visitor = EvaluateDataContextPath(control);
target = visitor.Result;
// evaluate the final expression
var node = ParseBinding(expression.Expression);
string propertyName = null;
if (node is IdentifierNameSyntax)
{
propertyName = ((IdentifierNameSyntax)node).ToString();
}
else if (node is MemberAccessExpressionSyntax)
{
target = visitor.Visit(((MemberAccessExpressionSyntax)node).Expression);
propertyName = ((MemberAccessExpressionSyntax)node).Name.ToString();
}
if (propertyName != null && !visitor.IsSpecialPropertyName(propertyName))
{
var propertyInfo = target.GetType().GetProperty(propertyName);
if (propertyInfo != null)
{
return propertyInfo;
}
}
throw new NotSupportedException(string.Format("Cannot update the source of the binding '{0}'!", expression.Expression));
}