public?partial?class?Form1?:?Form ????{ ????????public?Form1() ????????{ ????????????InitializeComponent(); ????????????//方法1：不進行跨線程安全檢查 ????????????//System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls?=?false; ????????} ??? ????????private?void?button1_Click(object?sender,?EventArgs?e) ????????{ ????????????Thread?th1?=?new?Thread(new?ThreadStart(CalNum)); ????????????th1.Start(); ????????} ??? ????????private?void?CalNum() ????????{ ????????????//button1.Enabled?=?false; ??? ????????????int?result?=?0; ????????????for?(int?i?=?1;?i?<?100000000;?i++) ????????????{ ????????????????result?+=?i; ????????????} ??? ????????????SetCalResult(result); ??? ????????????//button1.Enabled?=?true; ????????} ??? ????????//方法2：檢查是否跨線程，然后將方法加入委托，調用委托 ????????public?delegate?void?SetTextHandler(int?result); ????????private?void?SetCalResult(int?result) ????????{ ????????????if?(label2.InvokeRequired?==?true) ????????????{ ????????????????SetTextHandler?set?=?new?SetTextHandler(SetCalResult);//委托的方法參數應和SetCalResult一致 ????????????????label2.Invoke(set,?new?object[]?{?result?});?//此方法第二參數用于傳入方法,代替形參result ????????????} ????????????else ????????????{ ????????????????label2.Text?=?result.ToString(); ????????????} ????????} ????}

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