/// <summary>
/// Performs the binding of the dynamic get index operation.
/// </summary>
/// <param name="binder">
/// An instance of the <see cref="T:System.Dynamic.GetIndexBinder" /> that represents the details of the dynamic operation.
/// </param>
/// <param name="indexes">
/// An array of <see cref="T:System.Dynamic.DynamicMetaObject" /> instances - indexes for the get index operation.
/// </param>
/// <returns>
/// The new <see cref="T:System.Dynamic.DynamicMetaObject" /> representing the result of the binding.
/// </returns>
public override DynamicMetaObject BindGetIndex(GetIndexBinder binder, DynamicMetaObject[] indexes)
{
Expression[] parameters = { Expression.Constant(indexes.First(ix => ix.LimitType == typeof(string)).Value) };
var callMethod = CallMethod(GetValueMethod, parameters);
return callMethod;
}
/// <summary>
/// Performs the binding of the dynamic set index operation.
/// </summary>
/// <param name="binder">
/// An instance of the <see cref="T:System.Dynamic.SetIndexBinder" /> that represents the details of the dynamic operation.
/// </param>
/// <param name="indexes">
/// An array of <see cref="T:System.Dynamic.DynamicMetaObject" /> instances - indexes for the set index operation.
/// </param>
/// <param name="value">The <see cref="T:System.Dynamic.DynamicMetaObject" />
/// representing the value for the set index operation.
/// </param>
/// <returns>
/// The new <see cref="T:System.Dynamic.DynamicMetaObject" /> representing the result of the binding.
/// </returns>
public override DynamicMetaObject BindSetIndex(SetIndexBinder binder, DynamicMetaObject[] indexes, DynamicMetaObject value)
{
Expression[] parameters = { Expression.Constant(indexes.First().Value) };
var callMethod = CallMethod(SetValueMethod, parameters);
return callMethod;
}
public override DynamicMetaObject BindInvokeMember(
InvokeMemberBinder binder, DynamicMetaObject[] args)
{
if (FunctionMapping.ContainsFunction(binder.Name, args.Count()))
{
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
new[]
{
Expression.Constant(this.Value),
Expression.Constant(new ExpressionFunction(binder.Name, args.Select(x => x.Value)))
});
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
else if (string.Equals(binder.Name, ODataLiteral.Any, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.All, StringComparison.OrdinalIgnoreCase))
{
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
new[]
{
Expression.Constant(this.Value),
Expression.Constant(new ExpressionFunction(binder.Name, args.Select(x => x.Value)))
});
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
else if (string.Equals(binder.Name, ODataLiteral.IsOf, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.Is, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.Cast, StringComparison.OrdinalIgnoreCase) ||
string.Equals(binder.Name, ODataLiteral.As, StringComparison.OrdinalIgnoreCase))
{
var functionName = string.Equals(binder.Name, ODataLiteral.Is, StringComparison.OrdinalIgnoreCase)
? ODataLiteral.IsOf
: string.Equals(binder.Name, ODataLiteral.As, StringComparison.OrdinalIgnoreCase)
? ODataLiteral.Cast
: binder.Name;
var expression = Expression.New(CtorWithExpressionAndExpressionFunction,
new[]
{
Expression.Constant(this.Value),
Expression.Constant(new ExpressionFunction(
functionName,
new [] { (this.Value as ODataExpression).IsNull ? null : this.Value, args.First().Value }))
});
return new DynamicMetaObject(
expression,
BindingRestrictions.GetTypeRestriction(Expression, LimitType));
}
else
{
return base.BindInvokeMember(binder, args);
}
}
