不一致的可訪問性C＃

Question

我正在爲跟蹤股票的自定義用戶界面工作，儘管我製作的一個UI導致了一個我找不到的問題。我不斷收到錯誤：「可訪問性不一致：參數類型 'SCM_Addin.Funds.TrackFund []' 是比方法更少可訪問的 'SCM_Addin.Forms.frm_FundTracker.frm_FundTracker（SM_Addin.Funds.TrackFund []）'

I」已經檢查了保護我的班，但我無法找到任何私有變量會妨礙在我的代碼可訪問以下是代碼：

frm_FundTracker：

namespace SCM_Addin.Forms 

{ 公共部分類frm_FundTracker ：表格 {

public frm_FundTracker() 
    { 
     InitializeComponent(); 
    } 

    public frm_FundTracker(String[] fundsToAdd, Double[] ePrices, Double[] cPrices) 
    { 

     InitializeComponent(); 

     int index = 0; 
     foreach (String fund in fundsToAdd) 
     { 

      ListViewItem newFundItem = new ListViewItem(fund); 
      newFundItem.SubItems.Add(ePrices[index].ToString()); 
      newFundItem.SubItems.Add(cPrices[index].ToString()); 

      this.list_Tracker.Items.Add(newFundItem); 

      index++; 

     }//END LOADING COLUMNS 


    }//END FRM_FUNDTRACKER WITH ARRAYS 

    public frm_FundTracker(TrackFund[] funds) 
    { 
     InitializeComponent(); 

     foreach (TrackFund fund in funds) 
     { 
      ListViewItem newFundItem = new ListViewItem(fund.symbol); 
      newFundItem.SubItems.Add(fund.entryPrice.ToString()); 
      newFundItem.SubItems.Add(fund.currentPrice.ToString()); 

      this.list_Tracker.Items.Add(newFundItem); 
     } 
    }//END FRM_FUNDTRACKER WITH FUNDS 

    private void btn_Done_Click(object sender, EventArgs e) 
    { 

     if (MessageBox.Show("Close Form?", "Close Form?", MessageBoxButtons.YesNo) == System.Windows.Forms.DialogResult.Yes) 
     { 
      this.Dispose(); 
     } 

    } 

} 

}

基金類別：

namespace SCM_Addin 
{ 
class Fund 
{ 

    public String symbol { get; set; } //Symbol of the fund to be used 
    private int fundRow { get; set; } //Fund's spot in the Stats Sheet. 
    private String url1, url2, url3; 
    private HtmlAgilityPack.HtmlDocument doc; 
    private DataPuller puller; 
    private Dictionary<String, String> fundStats; 
    private SqlConnection conn; 

    public Fund(String sym) 
    { 

     this.symbol = sym; 
     this.doc = new HtmlAgilityPack.HtmlDocument(); 
     this.puller = new DataPuller(); 
     this.url1 = "http://finance.yahoo.com/q?s=" + this.symbol; 
     this.url2 = "http://finance.yahoo.com/q/ks?s=" + this.symbol; 
     this.url3 = "http://www.profitspi.com/stock-quote/" + this.symbol + ".aspx"; 
     this.fundStats = new Dictionary<string, string>(); 
     this.conn = null; 


    } 

TrackFund類（擴展基金）

namespace SCM_Addin.Funds 
{ 
class TrackFund : Fund 
{ 

    public double entryPrice { get; set; } 
    public double currentPrice { get; set; } 

    public TrackFund(String sym, double entryP, double curP) : base(sym) 
    { 

     this.entryPrice = entryP; 
     this.currentPrice = curP; 

    } 

} 
} 

這是我第一次真正延長在C＃中的一類，因此，如果我米錯誤，我想這可能是。

Answer 1

Default accessibility for a class will be internal，所以：

class Fund 
//and 
class TrackFund : Fund 

...應該是

public class Fund 
//and 
public class TrackFund : Fund 

Answer 2

使TrackFund類公開。

public class TrackFund : Fund 
{ 
.... 
}