v-wywang
5/8/2008 6:15:00 AM
Hello Check,
Thanks for your reply.
It seems returned object is dynamically created in LinqDataSource's
Selecting event with select statement. Anonymous type object hasn't default
constructor. This results the error when running "object ojb =
Activator.CreateInstance(typeObj)" statement. In such scenario, my
suggestion is to create each argument instance and pass them into Anonymous
type constructor as below. The following code is what I tested on my side.
It should also works with default contructor. Let me know if you face any
issue on it.
void LinqDataSource1_Selected(object sender, LinqDataSourceStatusEventArgs
e)
{
Type typeList = e.Result.GetType(); //List<T> for a select
statement
Type typeObj = e.Result.GetType().GetGenericArguments()[0];
//<T>
// Arguments list for <T> constructor.
{
ArrayList typeObjArguments = new ArrayList();//
foreach (Type t in typeObj.GetGenericArguments())
{
typeObjArguments.Add(Activator.CreateInstance(t));
}
}
object ojb = Activator.CreateInstance(typeObj,
typeObjArguments.ToArray()); //new T
// insert the new T into the list by using InvokeMember on the
List<T>
object result = null;
object[] arguments = { 0, ojb };
result = typeList.InvokeMember("Insert",
BindingFlags.InvokeMethod, null, e.Result, arguments);
}
Hope this helps. Please feel free to let us know if you have any more
concern. We are glad to assist you.
Best regards,
Wen Yuan
Microsoft Online Community Support
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