Question

I have a database of strings that contain IDs. I need to pass that list into a LINQ query so I can pull the correct records.

std::stoi

model.SelectedDealers = db.dealers.Any(a => a.sdealer_name.Contains(UserToEdit.UserViewAccesses.Select(s => s.ViewReferenceNumber))); is of type SelectedDealers

dealers should be a list of ViewReferenceNumber

So essentially I am trying to find all of the strings which should match sdealer_name whos dealers matches the list of sdealer_name I have in my sdealer_names

I've tried moving parts around and switching them in different spots and can't seem to figure this out.

Answer 1

Any() is just a boolean indicating if there are any results. It doesn't actually return the results.

If I understand what you are after correctly, then this might work:

package com.example.chris.sunil_gupta;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.CallLog;
import android.widget.ListView;

public class MainActivity extends Activity {



    private List <CallData>list = new ArrayList<CallData>();
    private Context context=null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        final ListView listview;
        final String callType;
        final String phoneNumber;
        final String callDate;
        final String callDuration;
        final Date callDateTime;

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        context=this;

        listview=(ListView)findViewById(R.id.ListView_CallData);

        getCallDetails();
        CustomAdapter adapter = new CustomAdapter(MainActivity.this, list);
        listview.setAdapter(adapter);
    }

    public void getCallDetails()
    {
        @SuppressWarnings("deprecation")
        Cursor managedCursor = managedQuery( CallLog.Calls.CONTENT_URI,null, null,null, null);

        int number = managedCursor.getColumnIndex( CallLog.Calls.NUMBER );
        int type = managedCursor.getColumnIndex( CallLog.Calls.TYPE );
        int date = managedCursor.getColumnIndex( CallLog.Calls.DATE);
        int duration = managedCursor.getColumnIndex( CallLog.Calls.DURATION);


        while (managedCursor.moveToNext())
        {

            phoneNumber = managedCursor.getString(number);
            callType = managedCursor.getString(type);
            callDate = managedCursor.getString(date);

            callDateTime = new Date(Long.valueOf(callDate));

            callDuration = managedCursor.getString(duration);

            String cType = null;

            int cTypeCode = Integer.parseInt(callType);

            switch(cTypeCode)
            {
                case CallLog.Calls.OUTGOING_TYPE:
                    cType = "OUTGOING";
                    break;

                case CallLog.Calls.INCOMING_TYPE:
                    cType= "INCOMING";
                    break;

                case CallLog.Calls.MISSED_TYPE:
                    cType = "MISSED";
                    break;
            }

            CallData calldata=new CallData(cType, phoneNumber, callDateTime, callDuration);
            list.add(calldata);
        }

        managedCursor.close();
    }
}

Answer 2

所以基本上我试图找到所有的经销商 sdealer_name匹配我的sdealer_names列表 UserToEdit.UserViewAccesses

   var dealersthatmatched = (from d in UserToEdit.UserViewAccesses.sdealer_names
                             where d == sdealer_name
                             select d).ToList()

希望我可以发表评论，但由于我没有足够的代表，我不能。我希望我能更好地理解这个要求，但你似乎已经准备好并且能够尝试一些东西，所以也许你觉得这很有用。

LINQ pull records from a database where string list is from a model

2 个答案: