由於參數，無法調用方法

Question

我不確定在If/Else語句中調用函數時要傳遞哪些參數。

If/Else語句正在調用2個函數之一Online_Version或Offline版本。

代碼如下：

public void Form1_Load(object sender, EventArgs e) 
    { 
     if (MessageBox.Show("Would you like to run the Event Register?", "Registration Selection", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) 
     { 
      label5.Text = "Event Registration"; 
      textBox1.Select(); 
      this.TopMost = true; 
      this.FormBorderStyle = FormBorderStyle.None; 
      this.WindowState = FormWindowState.Maximized; 
      var fileSave = new FileStream(fullFileName, FileMode.Create); 
      fileSave.Close(); 
      OfflineRegister(); 

     } 
     else 
     { 
      label5.Text = "ICAS Register"; 
      textBox1.Select(); 
      this.TopMost = true; 
      this.FormBorderStyle = FormBorderStyle.None; 
      this.WindowState = FormWindowState.Maximized; 
      var fileSave = new FileStream(fullFileName, FileMode.Create); 
      fileSave.Close(); 
      OnlineRegister(); 

     } 
    } 

    public void Online_Register(object sender, KeyPressEventArgs e) 
    { 
     OnlineRegister(); 
    } 

    public void Offline_Register(object sender, KeyPressEventArgs e) 
    { 
     OfflineRegister(); 
    } 

    public void OnlineRegister() 
    { 
     SqlConnection DBConnection = new SqlConnection("Data Source=DATABASE;Initial Catalog=imis;Integrated Security=True"); 
     SqlCommand cmd = new SqlCommand(); 
     Object returnValue; 

     string txtend = textBox1.Text; 
     string lastTwoChars = txtend.Substring(txtend.Length - 1); 

     if (textBox1.Text.Length != 6 && e.KeyChar != '*') return; 

     //cmd.CommandText = ("SELECT last_name +', '+ first_name +'\t ('+major_key+')\t' from name where id =@Name"); 
     cmd.CommandText = ("SELECT last_name +', '+ first_name from name where id =@Name"); 
     cmd.Parameters.Add(new SqlParameter("Name", textBox1.Text.Replace(@"L", ""))); 
     cmd.CommandType = CommandType.Text; 
     cmd.Connection = DBConnection; 

     //Time = DateTime.Now.ToString("HH:mm"); 
     //TimeIn = "Time In: "; 
     //TimeOut = "Time Out: "; 
     returnValue = cmd.ExecuteScalar() + "\t (" + textBox1.Text.Replace(@"L", "") + ")"; 
     DBConnection.Close(); 

     if (listBox1.Items.Contains(returnValue)) 
     { 
      for (int n = listBox1.Items.Count - 1; n >= 0; --n) 
      { 
       string removelistitem = returnValue.ToString(); 
       if (listBox1.Items[n].ToString().Contains(removelistitem)) 
       { 
        listBox1.Items.RemoveAt(n); 
        //listBox1.Items.Add(removelistitem + " " + 'TimeOut' + 'Time'); 
       } 
      } 
     } 
     else 

      listBox1.Items.Add(returnValue); 

     textBox1.Clear(); 

     System.IO.StreamWriter sw = new System.IO.StreamWriter(fullFileName); 
     foreach (object item in listBox1.Items) 
      sw.WriteLine(item.ToString()); 
     sw.Flush(); 
     sw.Close(); 

     if (listBox1.Items.Count != 0) { DisableCloseButton(); } 
     else 
     { 
      EnableCloseButton(); 
     } 
     label6.Text = "Currently " + listBox1.Items.Count.ToString() + " in attendance."; 
     e.Handled = true; 
    } 

    public void OfflineRegister() 
{ 
    Object returnValue; 

     string txtend = textBox1.Text; 
     returnValue = textBox1.Text.Replace(@"*", ""); 

     if (e.KeyChar != '*') return; 
     { 
      if (listBox1.Items.Contains(returnValue)) 
      { 
       for (int n = listBox1.Items.Count - 1; n >= 0; --n) 
       { 
        string removelistitem = returnValue.ToString(); 
        if (listBox1.Items[n].ToString().Contains(removelistitem)) 
        { 
         //listBox1.Items.RemoveAt(n); 
        } 
       } 
      } 
      else 
      { 
       listBox1.Items.Add(returnValue); 
       textBox1.Clear(); 
       System.IO.StreamWriter sw = new System.IO.StreamWriter(fullFileName); 
       foreach (object item in listBox1.Items) 
       sw.WriteLine(item.ToString()); 
       sw.Flush(); 
       sw.Close(); 
       if (listBox1.Items.Count != 0) { DisableCloseButton(); } 
       else 
       { 
        EnableCloseButton(); 
       } 
       label6.Text = "Currently " + listBox1.Items.Count.ToString() + " in attendance."; 
       e.Handled = true; 
      } 
     } 
} 

任何幫助表示讚賞！

Answer 1

你應該做的是採取Online_Register/Offline_Register事件處理程序的代碼OUF並把它放在一個不同的方法叫：OnlineRegister和OfflineRegister例如，這樣你可以這樣做：

public void Form1_Load(object sender, EventArgs e) 
    { 
     if (MessageBox.Show("Would you like to run the Event Register?","Registration Selection", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes) 
     { 
      label5.Text = "Event Registration"; 
      textBox1.Select(); 
      this.TopMost = true; 
      this.FormBorderStyle = FormBorderStyle.None; 
      this.WindowState = FormWindowState.Maximized; 
      var fileSave = new FileStream(fullFileName, FileMode.Create); 
      fileSave.Close(); 
      OfflineRegister(); 

     } 
     else 
     { 
      label5.Text = "ICAS Register"; 
      textBox1.Select(); 
      this.TopMost = true; 
      this.FormBorderStyle = FormBorderStyle.None; 
      this.WindowState = FormWindowState.Maximized; 
      var fileSave = new FileStream(fullFileName, FileMode.Create); 
      fileSave.Close(); 
      OnlineRegister(); 

     } 
    } 

    public void Online_Register(object sender, KeyPressEventArgs e) 
    { 
     OnlineRegister(); 
    } 

    public void Offline_Register(object sender, KeyPressEventArgs e) 
    { 
     OfflineRegister(); 
    } 

    public void OnlineRegister() 
    { 
    // Do Stuff 
    } 

    public void OfflineRegister() 
    { 
    // Do Stuff 
    } 

這當然假設你實際上需要KeyPress事件處理程序。上述

說明

代碼的底部示出了我剛創建的兩種方法。這些可以從事件處理程序和事件中調用。這很有用，因爲您不必反覆粘貼相同的代碼。

改進 你可以通過採取Register代碼，並把它不同的類中提高你的當前情況下，也可以叫做，RegisterHelper什麼的，其用於註冊用戶提供邏輯的目的。

此外，你可以給你的表單一個更合適的名稱，而不是Form1。

Answer 2

檢查FullFileName變量的值，方法看起來很完美。始終隔離用戶界面和功能事件。