無法使用以下方法填充多個組合框

Question

我使用以下方法在程序啓動時用我的數據庫中的信息填充組合框。當我用它來填充一個組合框時它工作正常。但是如果我使用它來填充多個組合框，它將返回一個錯誤XAMLParseException。請諮詢有什麼不對。謝謝。

public void fillCombo(string query, string name, ComboBox c) 
     { 
      MySqlCommand cmdReader = new MySqlCommand(query,conn); 
      MySqlDataReader myReader; 

      myReader = cmdReader.ExecuteReader(); 

      while(myReader.Read()) 
      { 
       string temp = myReader.GetString(name); 
       c.Items.Add(temp); 
      } 
     } 

//If I call to fill one combo box it works 
public MainWindow() 
{ 
    InitializeComponent(); 
    fillCombo("SELECT * FROM Jobs;", "Job_ID", comboBoxJobID); 
} 

//If I call to fill multiple comboboxes, it returns the error. 
public MainWindow() 
{ 
    InitializeComponent(); 
    fillCombo("SELECT * FROM Departments;", "Dept_ID", comboBoxDeptID); 
    fillCombo("SELECT * FROM Jobs;", "Job_ID", comboBoxJobID); 
    fillCombo("SELECT * FROM Missions;", "Mission_ID", comboBoxMissionID); 
} 

Answer 1

您沒有關閉您的閱讀器。嘗試以下操作。

public void fillCombo(string query, string name, ComboBox c) 
     { 
      MySqlCommand cmdReader = new MySqlCommand(query,conn); 
      MySqlDataReader myReader; 

      myReader = cmdReader.ExecuteReader(); 

      while(myReader.Read()) 
      { 
       string temp = myReader.GetString(name); 
       c.Items.Add(temp); 
      } 
     } 
     myReader.Close();