CODEWITHSUNDEEP
linq
Ayda Sayed
Ayda Sayed

Reputation: 509

cannot convert from 'System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable to System.Collections.Generic.List

I am working on these lists to get an item that matches the selected item from the combobox. 

private void InitializaMessageElement()
{
    if (_selectedTransactionWsName != null)
    {

  1. get a transaction webservice name matching the selected item from the drop down here the output=TestWS which is correct

    var getTranTypeWsName = TransactionTypeVModel
     .GetAllTransactionTypes()
     .FirstOrDefault(transTypes => 
             transTypes.WsMethodName == _selectedTransactionWsName);

  2. Loop the list of wsnames from the treenode list. Here it gives me all the node I have which is correct.

    var wsNameList = MessageElementVModel
     .GetAllTreeNodes().Select(ame => 
             ame.Children).ToList();//. == getTranTypeWsName.WsMethodName);

  3. find the getTranTypeWsName.WsMethodName in the wsNameList. Here is where I have the problem:

          var msgElementList = wsNameList.Select(x => x.Where(ame => getTranTypeWsName != null && ame.Name == getTranTypeWsName.WsMethodName)).ToList();

my MsgElement list:

   _msgElementObsList = new ObservableCollection<MessageElementViewModel>(msgElementList);
    this.messageElements = _msgElementList;
    NotifyPropertyChanged("MessageElements");
}

Here it is throwing exception Cannot convert from 'System.Collections.Generic.IEnumerable<System.Collections.Generic.IEnumerable to System.Collections.Generic.List).

Upvotes: 1

Views: 187

Answers (2)

Ceres
Ceres

Reputation: 3668

You have a List of IEnumerable not a List of MessageElementViewModel. That is why you are throwing an error.

Not sure which one you need but you could fix your Select function like this.

var msgElementList = wsNameList.Select(x => x.Where(ame => getTranTypeWsName != null && ame.Name == getTranTypeWsName.WsMethodName).First()).ToList();

or

var msgElementList = wsNameList.SelectMany(x => x.Where(ame => getTranTypeWsName != null && ame.Name == getTranTypeWsName.WsMethodName)).ToList();

Upvotes: 1

Garrison Neely
Garrison Neely

Reputation: 3289

Can you rework your msgElementList to

var msgElementList = wsNameList.Where(x => x.Name == getTranTypeWsName.WsMethodName).ToList();?

The getTranTypeWsName != null doesn't belong in there I don't think because it doesn't compare with any of the lambda's members.

Upvotes: 0

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