private static BinaryExpression GetANDExpression(ParameterExpression param, PartialExp filter1, PartialExp filter2)
{
Expression bin1 = GetExpression(param, filter1);
Expression bin2 = GetExpression(param, filter2);
return(Expression.AndAlso(bin1, bin2));
}
private static Expression GetExpression(ParameterExpression param, PartialExp filter)
{
MemberExpression member = Expression.Property(param, filter.PropertyName);
ConstantExpression constant = Expression.Constant(filter.Value);
switch (filter.Operation)
{
case Op.Equals:
return(Expression.Equal(member, constant));
case Op.GreaterThan:
return(Expression.GreaterThan(member, constant));
case Op.GreaterThanOrEqual:
return(Expression.GreaterThanOrEqual(member, constant));
case Op.LessThan:
return(Expression.LessThan(member, constant));
case Op.LessThanOrEqual:
return(Expression.LessThanOrEqual(member, constant));
case Op.Contains:
return(Expression.Call(member, containsMethod, constant));
case Op.StartsWith:
return(Expression.Call(member, startsWithMethod, constant));
case Op.EndsWith:
return(Expression.Call(member, endsWithMethod, constant));
}
return(null);
}