So, I’ve struggled some with this and did not have much help with searching.
Here is the problem.
You have a declaration that looks like this:
1: public partial class CompanyQuery {
2: public List<int> CompanyTypeIds { get; set; }
3: }
Then, you need to figure out if CompanyTypeIds is populated using reflection.
Here is the code:
1: CompanyQuery query = new CompanyQuery;
2: query.CompanyTypeIds = new List<int> {1,2,3,4}
3:
4: foreach (var info in typeof(CompanyQuery).GetProperties())
5: {
6: object[] attributes = info.GetCustomAttributes(typeof(ForceNoCompileColumnAttribute), true);
7: if (attributes.Length > 0)
8: {
9: object value = info.GetValue(query, null);
10: if (value != null && value.GetType() == (new List<int>()).GetType())
11: {
12: if (((List<int>)value).Count > 0)
13: {
14: forceNoCompile = true;
15: }
16: }
17: else if (value != null)
18: {
19: forceNoCompile = true;
20: }
21: }
22: }
23:
That’s basically it.
Hope this helps.
June 2nd, 2009 at 12:58 am
Here’s a general purpose Lambda Expression Extension Method that simplifies the process of getting a Property value. This should also perform better.
Extension Method
—————–
public static Func GetProperty(this Type self, string name)
{
ParameterExpression parameter = Expression.Parameter(typeof(X), “obj”);
MemberExpression property = Expression.Property(parameter, name);
return (Func)Expression.Lambda(typeof(Func), property, parameter).Compile();
}
Usage
——————–
CompanyQuery query = new CompanyQuery { CompanyTypeIds = new List { 1, 2, 3, 4 } };
Type type = typeof(CompanyQuery);
Func<CompanyQuery, List> getList = type.GetProperty<CompanyQuery, List>(“CompanyTypeIds”);
List ids = getList(query);
bool forceNoCompile = (ids != null && ids.Count > 0);
Hope this helps.
June 2nd, 2009 at 5:52 am
Thanks Geoff for the tip. My problem is that I don’t know ahead of time it is of type List. Is there a way around that?