LINQ and Reflection

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wildThought - 25 Sep 2007 01:50 GMT

If I get an object generated by SQL Metal I can do a call like:

db.Persons.Add(new Person(){name = "ED"};

So far, so good. However, we are loading a DB from MetaData, I need
to do this via reflection.

If I do db.GetType().GetProperty("Persons")

No Problem. I get the right object.

Now, when I do
db.GetType().GetProperty("Persons").GetType().GetMethods()

The Add method is not reflected, I wanted to be able to Dynamically
Invoke this object, but it does not show up as avalid Method.

Any Thoughts?

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Jon Skeet [C# MVP] - 25 Sep 2007 08:25 GMT

> If I get an object generated by SQL Metal I can do a call like:
>
[quoted text clipped - 14 lines]
>
> Any Thoughts?

Yes - GetProperty returns a PropertyInfo, and you're calling GetType()
on that. You should be using

db.GetType().GetProperty("Persons").PropertyType.GetMethods()

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Ben Voigt [C++ MVP] - 26 Sep 2007 23:39 GMT

>> If I get an object generated by SQL Metal I can do a call like:
>>
[quoted text clipped - 19 lines]
>
> db.GetType().GetProperty("Persons").PropertyType.GetMethods()

Moreover, you likely want to use the override of GetMethods that accepts an
argument. From its doc page:

The following BindingFlags filter flags can be used to define which methods
to include in the search:

a.. You must specify either BindingFlags.Instance or BindingFlags.Static
in order to get a return.

b.. Specify BindingFlags.Public to include public methods in the search.

c.. Specify BindingFlags.NonPublic to include non-public methods (that is,
private and protected members) in the search.

d.. Specify BindingFlags.FlattenHierarchy to include public and protected
static members up the hierarchy; private static members in inherited classes
are not included.

The following BindingFlags modifier flags can be used to change how the
search works:

a.. BindingFlags.DeclaredOnly to search only the methods declared on the
Type, not methods that were simply inherited.

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LINQ and Reflection

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