Question

I am moving from VB to C#. I am trying to loop through a collection class which is a collection of data classes but I can’t seem to get the actual values out of the data class properties(find the correct code to do so). I have a method that loops through the collection class(Contacts) and saves each record(Contact). I am using reflection because my method will not know if it is Contacts class or a Customer class and so forth. Here is my code in VB(watered down)

Public Function SaveCollection(ByVal objCollection as Object, ByVal TableName as string, ByVal spSave as string)

 Dim objClass as Object
 Dim propInfo as PropertyInfo

For Each objClass in objCollection

    propInfo = objClass.GetType.GetProperty("TableFieldName")


Next

End Function

I am having problems in C# with the objClass.GetType.GetProperty(“TableFieldName”) line

Here is my C# code

public in SaveCollection(DictionaryBase objCollection, string TableName, string spSave)
{
    PropertyInfo propInfo;

   foreach (DictionaryEntry objClass in objCollection)
      {
       propInfo = objClass.GetType().GetProperty("TableFieldName")

       }

}

The C# code keeps returning null. In my locals window I can see the proprties on the class on objClass and the value of the propery but I can seem to figure out how to access it through code. I used the DictionaryBase because that seems to closely match would I need to do. My data class(Contact) has a bunch or properties that match the field names in the database of the Contact Table. After I get the propInfo variable set I then set up my SQLParameter with the fieldname, datatype etc and then set the value to the propInfo.value.

Thanks for the help.

Answer 1

you need to get the value afterwords. also note that GetValue returns an object, you can then cast it to string or int or whatever type the value you expect is in.

public in SaveCollection(DictionaryBase objCollection, string TableName, string spSave)
{
    PropertyInfo propInfo;

   foreach (DictionaryEntry objClass in objCollection)
      {
           object tempObj = objClass.Value;
           propInfo = tempObj.GetType().GetProperty("TableFieldName");

           object[] obRetVal = new Object[0];
           object value = propInfo.GetValue(tempObj,obRetVal);
       }

}

if you know that TableFieldName will be a string then change this line.

string value = propInfo.GetValue(tempObj,obRetVal) as string;