How can I do that in C# with reflection?

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I'm trying to do a generic persist method using reflecion and MongoDB.

The normal code is:

C#

public bool InsertParent(ParentDTO parent)
       {
           var collection = db.GetCollection<Parent>(ParentCollectionName);
           var collectionC = db.GetCollection<Child>(ChildCollectionName);
           try
           {
               var parentdb = new Parent();
               parentdb.ParentCode = parent.ParentCode;

               collection.InsertOne(parentdb);
               parent.ListChild.ForEach(c => {
                   var childDB = new Child();
                   childDB.ParentID = parentdb.ParentID;
                   childDB.ChildCode = c.ChildCode;
                   collectionC.InsertOne(childDB);
               }
                 );
               return true;
           }
           catch (System.Exception)
           {
               throw;
           }
       }

But in this way, I always must create the collections with the right type:

C#

var collection = db.GetCollection<parent>(ParentCollectionName);

and I´d like to do something like that:

C#

public bool InsertMongoDb(object objeto)
        {
              if (objeto == null)
              {
                  return false;
              }
              var typeO = objeto.GetType();
              
              //here is the problem. The var typeO is not accepted. 
               var collection = db.GetCollection<???>(objeto.collectionName);             

              PropertyInfo[] properties = typeO.GetProperties();
              foreach (var ppo in properties)
              {
                  if (ppo.PropertyType.Name.ToLower() == "List`1".ToLower() )
                    {
                        Type type = ppo.PropertyType;
                        // here I will read the CHILD objects
                        if (IsList(type))
                        {
                           var ret = GetCollectionElementType(type);
                            PropertyInfo info = typeO.GetProperty(ppo.Name);
                            var list = (System.Collections.IList)info.GetValue(objeto, null);
                            foreach (var item in list) 
                            {
                                PropertyInfo[] propertieS = ret.GetProperties();
                                foreach (var ppi in propertieS)
                                {
                                  //Here I will call recusrivelly
                                  InsertMongoDb(?????)  
                                  //How can I get the object here.
                                }                                
                            }
                        }
                    }
              }

            return true;
        }

Thanks!

What I have tried:

I tried:

C#

objeto.GetType().BaseType;

Posted 19-Jul-21 5:36am

aledeol

Updated 24-Oct-23 11:04am

Deeksha Shenoy

v2

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[no name] 19-Jul-21 12:18pm

public bool InsertMongoDb<t>(T objeto) { etc. }

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Member 16121670 · Answer 1 · 2023-10-22T20:46:00

Hi,

I know it's a bit late to answer this question, but you could use reflection to construct the generic method with something similar to this:

C#

//var typeO = objeto.GetType();
//here is the problem. The var typeO is not accepted. 
//var collection = db.GetCollection<???>(objeto.collectionName);

// get `db` type because we need the method information from the type
var dbType = db.GetType();

// get generic method `GetCollection<T>`
var genericMethod = dbType.GetMethod("GetCollection");

// construct the method using `typeO` for T like `GetCollection<typeO>`
var methodInfo = mi.MakeGenericMethod(typeO);

// prepare the `objeto` arguments
object[] args = { objeto };

// call the method using instance `db` and argument `objeto`
var collection = methodInfo.Invoke(db, args);

And then, instead of the following code

C#

var list = (System.Collections.IList)info.GetValue(objeto, null);
foreach (var item in list) 
{
PropertyInfo[] propertieS = ret.GetProperties();
foreach (var ppi in propertieS)
{
//Here I will call recusrivelly
InsertMongoDb(?????)  
//How can I get the object here.
}
}

you can use:

C#

var list = (System.Collections.IList)info.GetValue(objeto, null);
foreach (var item in list)
InsertMongoDb(item);

Good luck and have a nice day!