public override Type EvaluateType()
{
var innerType = InnerExpression.EvaluateType();
var canBeNull = TypeHelper.CanAssignNullToType(innerType);
switch (Function.FunctionName)
{
case Common.Function.ToFloat:
return(canBeNull ? typeof(float?) : typeof(float));
case Common.Function.ToString:
return(typeof(string));
case Common.Function.ToBoolean:
return(canBeNull ? typeof(bool?) : typeof(bool));
case Common.Function.ToInteger:
return(canBeNull ? typeof(int?) : typeof(int));
case Common.Function.ToDouble:
return(canBeNull ? typeof(long?) : typeof(long));
case Common.Function.ToLong:
return(canBeNull ? typeof(double?) : typeof(double));
case Common.Function.Not:
return(canBeNull ? typeof(bool?) : typeof(bool));
case Common.Function.StringContains:
case Common.Function.StringStartsWith:
case Common.Function.StringEndsWith:
case Common.Function.IsNull:
case Common.Function.IsNotNull:
return(typeof(bool));
case Common.Function.StringSize:
return(typeof(int));
default:
// treat all the rest as type preserving, e.g.
// trim, ltrim ....
return(InnerExpression.EvaluateType());
}
}
public override Type EvaluateType()
{
return(InnerExpression.EvaluateType());
}
