ListView Thread on C＃

Question

任何人都可以幫助我解決這個問題，因爲我不知道如何處理它。

foreach (ListViewItem itemrow in this.listView1.Items) 
{ 
    result = PumpStart.SymbolAdd(itemrow.SubItems[0].Text.Trim()); 
    if(result != ResultCode.Ok) 
    { 
      Console.WriteLine("Error adding symbol. " + mgr.ErrorDescription(result)); 
    } 
} 

但是當我嘗試運行該程序，我有這樣的錯誤：

"An exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll but was not handled in user code

Additional information: Cross-thread operation not valid: Control 'listView1' accessed from a thread other than the thread it was created on."

非常感謝你。

Answer 1

如果listView1負責交叉線程錯誤，那麼您將需要使用它的Invoke或BeginInvoke方法來訪問和修改數據。

正如documentation說：

The Method executes the specified delegate asynchronously on the thread that the control's underlying handle was created on.

換句話說：它拉要執行回其創建了要修改的Control線程的代碼段。

BeginInvoke需要Delegate作爲參數。在這個例子中Action是服務這一功能：

this.listView1.BeginInvoke(
      new Action(() => 
      { 
       foreach (ListViewItem itemrow in this.listView1.Items) 
       { 
        result = PumpStart.SymbolAdd(itemrow.SubItems[0].Text.Trim()); 
        if(result != ResultCode.Ok) 
        { 
         Console.WriteLine("Error adding symbol. " + mgr.ErrorDescription(result)); 
        } 
       } 
      }) 
);