private static Expression GetExpression <T>(ParameterExpression param, NWFilter filter) where T : IBusEntity, new()
{
MemberExpression member = Expression.Property(param, filter.PropertyName);
ConstantExpression constant = Expression.Constant(filter.Value);
switch (filter.Operation)
{
case G__ExpressionType.Equal:
return(Expression.Equal(member, constant));
case G__ExpressionType.GreaterThan:
return(Expression.GreaterThan(member, constant));
case G__ExpressionType.GreaterThanOrEqual:
return(Expression.GreaterThanOrEqual(member, constant));
case G__ExpressionType.LessThan:
return(Expression.LessThan(member, constant));
case G__ExpressionType.LessThanOrEqual:
return(Expression.LessThanOrEqual(member, constant));
case G__ExpressionType.Contains:
return(Expression.Call(member, containsMethod, constant));
case G__ExpressionType.StartsWith:
return(Expression.Call(member, startsWithMethod, constant));
case G__ExpressionType.EndsWith:
return(Expression.Call(member, endsWithMethod, constant));
}
return(null);
}
private static BinaryExpression GetExpression <T>(ParameterExpression param, NWFilter filter1, NWFilter filter2) where T : IBusEntity, new()
{
Expression bin1 = GetExpression <T>(param, filter1);
Expression bin2 = GetExpression <T>(param, filter2);
return(Expression.AndAlso(bin1, bin2));
}