Posted on 2008-06-23 14:39?SmartStone?閱讀(1334)?評論(2)?編輯?收藏? //聲明一個委托
publicdelegatevoidSetTextBoxValue(stringvalue);

????????//委托使用文本框
voidSetMyTextBoxValue(stringvalue)
????????{
????????????//?Control.InvokeRequired?屬性：?獲取一個值，該值指示調用方在對控件進行方法調用時是否必須調用?Invoke?方法，因為調用方位于創建控件所在的線程以外的線程中。當前線程不是創建控件的線程時為true,當前線程中訪問是False
????????????if?(this.TextBoxControl.InvokeRequired)
????????????{
????????????????SetTextBoxValue?objSetTextBoxValue?=?new?SetTextBoxValue(SetMyTextBoxValue);

????????????????//?IAsyncResult?接口：表示異步操作的狀態。不同的異步操作需要不同的類型來描述，自然可以返回任何對象。
????????????????//?Control.BeginInvoke?方法?(Delegate)：在創建控件的基礎句柄所在線程上異步執行指定委托。
????????????????IAsyncResult?result?=?this.TextBoxControl.BeginInvoke(objSetTextBoxValue,?new?object[]{?value?});
????????????????try?{
????????????????????objSetTextBoxValue.EndInvoke(result);
????????????????}
????????????????catch?{
????????????????}
????????????}
????????????else
????????????{
????????????????this.TextBoxControl.Text?+=?value?+?Environment.NewLine;
????????????????this.TextBoxControl.SelectionStart?=?this.TextBoxControl.TextLength;
????????????????this.TextBoxControl.ScrollToCaret();
????????????}
????????}

示例代碼：

publicTestForm()
????????{
????????????InitializeComponent();
????????}

????????privatedelegatevoidSetTextBoxValue(stringvalue);

????????privatevoidSetMyTextBoxValue(stringvalue)
????????{
????????????if?(this.TextBoxControl.InvokeRequired)
????????????{
????????????????SetTextBoxValue?objSetTextBoxValue?=?new?SetTextBoxValue(SetMyTextBoxValue);
????????????????IAsyncResult?result?=?this.TextBoxControl.BeginInvoke(objSetTextBoxValue,?new?object[]?{?value?});
????????????????try
????????????????{
????????????????????objSetTextBoxValue.EndInvoke(result);
????????????????}
????????????????catch
????????????????{
????????????????}
????????????}
????????????else
????????????{
????????????????this.TextBoxControl.Text?+=?value?+?Environment.NewLine;
????????????????this.TextBoxControl.SelectionStart?=?this.TextBoxControl.TextLength;
????????????????this.TextBoxControl.ScrollToCaret();
????????????}
????????}

????????privatevoidExecuteNewThread()
????????{
????????????for?(int?i?=?0;?i?<?1000;?i++)
????????????{
????????????????SetMyTextBoxValue(i.ToString());
????????????}
????????}

????????privatevoidNewThreadButton_Click(objectsender,?EventArgs?e)
????????{
????????????Thread?objThread?=?new?Thread(new?ThreadStart(ExecuteNewThread));
????????????objThread.IsBackground?=?true;
????????????objThread.Start();
????????}
????}

轉載于:https://www.cnblogs.com/zhangchenliang/archive/2012/04/12/2443789.html

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