如何在不同的事件中使用字符串變量？

Question

我想知道如何從其他方法調用/使用字符串。

public partial class PPAP_Edit : Form 
    { 
    string Main_dir { get; set; } 
    string Sub_dir { get; set; } 
    string targetPath { get; set; } 

...等等，我不想複製所有

private void button_browse_Click(object sender, EventArgs e) 
    { 
     if (od.ShowDialog() == System.Windows.Forms.DialogResult.OK) 
     { 
      try 
      { 
       Main_dir = @"C:\Users\h109536\Documents\PPAP\"; 
       Sub_dir = text_PSW_ID.Text + "_" + text_Partnumber.Text + "_" + text_Partrev.Text + @"\"; 
       targetPath = System.IO.Path.Combine(Main_dir, Sub_dir); 
       { 
        if (!System.IO.Directory.Exists(targetPath)) 
        { 
         System.IO.Directory.CreateDirectory(targetPath); 
         MessageBox.Show("Folder has been created!"); 
        } 
        foreach (string fileName in od.FileNames) 

         System.IO.File.Copy(fileName, targetPath + System.IO.Path.GetFileName(fileName), true); 
      } 
      catch (Exception ex) 
      { 
       MessageBox.Show("An error has occurred: " + ex.Message); 
      } 
        } 
private void button_open_Click(object sender, EventArgs e) 
    {    
     if (!Directory.Exists(targetPath)) 
     { 
      MessageBox.Show("Folder is not added to the database!"); 
      System.Diagnostics.Process.Start("explorer.exe", Main_dir);     
     } 
     else 
     { 
      System.Diagnostics.Process.Start("explorer.exe", Main_dir + Sub_dir); 
     }      
    } 

我reffering到Main_dir，Sub_dir和TARGETPATH字符串，但直到我單擊瀏覽按鈕時，打開按鈕方法才起作用。

非常感謝您的幫助！

Answer 1

從窗體的構造函數中設置主目錄的默認值。它隨後可用於表單中的任何方法。子路徑和目標路徑只是函數，可以放在屬性getter方法中。

public partial class PPAP_Edit : Form 
{ 
    // set this from constructor 
    public string MainDir { get; set; } 

    // can't set this in constructor as it requires access to form controls, but can just use the getter 
    public string SubDir 
    { 
     get 
     { 
      return text_PSW_ID.Text + "_" + text_Partnumber.Text + "_" + text_Partrev.Text + @"\"; 
     } 
    } 

    // again just use the getter 
    public string TargetPath 
    { 
     get 
     { 
      return Path.Combine(MainDir, SubDir); 
     } 
    } 

    // set defaults in constructor 
    public PPAP_Edit() 
    { 
     MainDir = @"C:\Users\h109536\Documents\PPAP\"; 
    } 
}