public void TestExpression()
{
var expr = "(Age != null) && (Id > 0)";
var context = new ExpressionContext();
var result = context.Create <P>(expr);
var flag1 = result.Func(new P {
Id = 2, Age = null
});
var flag2 = result.Func(new P {
Id = 2, Age = 2
});
}
private string ResolveIfNode <T>(IfNode node, T parameter)
{
if (node.Delegate == null)
{
lock (this)
{
var context = new ExpressionContext();
var result = context.Create <T>(node.Test);
node.Delegate = result.Func;
}
}
var func = node.Delegate as Func <T, bool>;
if (func(parameter))
{
return(ResolveTextNode(new TextNode {
Value = node.Value
}));
}
return(string.Empty);
}