Use Reflection to determine if a property is System.Nullable<System.DateTime>

Posted on 2010-01-12
Medium Priority
Last Modified: 2013-12-17

I'm trying to use reflection to copy some Request.QueryString[] values into a Linq2SQL object. This I do by iterating through the properties of the Linq Object and then checking if there is a QueryString available for that property.

However, these properties have different kind of types and I need to convert the QueryString data to the appropriate type before I can store it in the properties of the Linq Object.

This seems to work well:
Type propertyType = propertyInfo.GetType();
if (propertyType == typeof(Int32))
 // do some intelligent stuff here

But the following one does not work if the column is marked as Nullable:

if (propertyType == typeof(System.Nullable<System.DateTime>))
 // do some intelligent stuff here

Any suggestions as to how to fix this?
Question by:tacojoosterkamp
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LVL 22

Accepted Solution

p_davis earned 2000 total points
ID: 26295150
if(propertyType.GetGenericTypeDefinition() == typeof(Nullable<>)
LVL 42

Expert Comment

ID: 26295227
even if u declare datetime as nullable either
Nullable<DateTime> val = DateTime.Now;
DateTime ? val = DateTime.Now;

and check its type u get "DateTime"
check this code snippet:

Nullable<DateTime> val = DateTime.Now;
            Type t = val.GetType();
            bool equal = (t == typeof(DateTime));

equal is always true...

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