標籤文字未更新

Question

public void ItemGot() 
{ 
    number = number + 1;   //Increment by 1 
    quantity.Text = ("x" + number); //Overwrite Text 
    quantity.Refresh();    //Updates the text 
} 

您好，我上面有這段代碼。當這個方法運行時，我之前設置的標籤文本應該將文本更改爲我在下面設置的文本。但是，它沒有這樣做。此外，通過設置在Visual Studio中斷點，我已經確定：

1. 的方法被調用，
2. 號碼被正確地遞增。

應該沒有理由不工作，因爲該程序正在認識到number正在增加一個。我的朋友說了類似的問題here。仍然沒有幫助，現在代碼已經過時了。請幫忙！

編輯：我如何加入quantity標籤

首先，我在構造函數初始化它：public Label quantity;

那麼我這樣做：quantity = new Label();

最後，在另一種方法，我給了quantity以下屬性：

quantity.Size = new Size(24, 24); 
quantity.Text = ("x" + number); 

quantity.Left = 48; 

Controls.Add(quantity); 

號碼也是在構造和設置爲0

編輯2：我會後我的整個方法

public InventoryScreen() 
    { 
     btnItems = new Button(); 
     quantity = new Label(); 

     //call the methods for spawning the buttons 
     ButtonGenItems(cNumber, btnItems, quantity); 

     InitializeComponent(); 
    } 

    public void InventoryScreen_Load(object sender, EventArgs e) 
    { 

    } 

    #region ButtonGenItems Method 
    public void ButtonGenItems(int cNumber, Button btnItems,Label quantity) 
    { 
     int xPos = 126; 
     int yPos = 25; 

     for (int n = 0; n < 1; n++) 
     { 
      btnItems.Tag = n; 
      btnItems.Size = new Size(48, 52); //Button size X and Y 
      btnItems.BackColor = Color.CornflowerBlue; 

      quantity.Size = new Size(24, 24); 
      quantity.Text = ("x" + number); 

      if (yPos > 60) // Five Buttons in one column 
      { 
       yPos = 25; //spawn position Y 
       xPos = xPos + btnItems.Width + 10; //spacing X 
      } 

      btnItems.Left = xPos; //Start Button spawn at the Left side 
      btnItems.Top = yPos; //Start spawn at the top side 

      quantity.Left = 48; 
      quantity.Top = 60; 

      yPos = yPos + btnItems.Height + 10; 

      btnItems.Text = "Use"; 

      Controls.Add(btnItems); //place Buttons 
      Controls.Add(quantity); 

      // the Event of click Button 
      //btnItems.Click += new System.EventHandler(ItemUse); //to be implimented 
     } 
    } 

    #endregion 

    public void ItemGot() 
    { 
     //*Interestingly, the program recognizes that 'number' is increasing by 1, but label won't update the text 
     //Furthermore, pressing the actual button will trigger the text update, but simulating a buttonclick WONT DO ANYTHING 

     Console.WriteLine("Text should now increment by 1"); //Debugging to test method 
     number = number + 1;   //Increment by 1 
     quantity.Text = ("x" + number); //Overwrite Text 
    } 
} 

2.5這是怎樣的方法被調用。這種方法位於另一個類

public void Update(Vector2 pos) 
     { 
      this.position = pos; //get char position 
      Inv = new InventoryScreen(); //create instance of object 
      charRange = new Rectangle((int)position.X, (int)position.Y, 64, 57); //create rectangle 


      //Intersection Code, If the character intersects with the item while the item is showing, run below 
      if (alive && charRange.Intersects(itemRect)) 
      { 
       alive = false; //stop showing the item 
       Inv.ItemGot(); //Call the ItemGot class, which adds the item to the inventory screen 
      } 
     } 

Answer 1

據我所知，你已經打開/顯示形式與唱片公司（InventoryScreen類的實例），當你調用Update方法，但是......

裏面的方法Update您將創建一個新的InventoryScreen實例，並使用此新的窗體實例調用函數ItemGot。

我認爲你需要在方法Update通過你當前的InventoryScreen實例的引用，然後使用該引用調用ItemGot方法

public void Update(Vector2 pos, InventoryScreen invscreen) 
{ 
    this.position = pos; 
    charRange = new Rectangle((int)position.X, (int)position.Y, 64, 57); 

    if (alive && charRange.Intersects(itemRect)) 
    { 
     alive = false; 
     invscreen.ItemGot(); 
    } 
}