摘要
啟動線程的時候需要向線程函數中傳遞參數，一般有三種方式。
正文
用object 傳參數
private void btnStart_Click(object sender, EventArgs e){ Thread t1 = new Thread(ShowDot); t1.Start(10);}
void ShowDot(object max){ int imax=int.Parse(max.ToString()); for (int i = 0; i < imax; i++) { this.BeginInvoke((() => { txtValue.Text += "."; })); System.Threading.Thread.Sleep(10); }}
通過lambda
private void btnStart_Click(object sender, EventArgs e){ Thread t1 = new Thread(() => { ShowDot(10); }); t1.Start();}
void ShowDot(int max){ for (int i = 0; i < max; i++) { this.BeginInvoke((() => { txtValue.Text += "."; })); System.Threading.Thread.Sleep(10); }}
使用類封裝
public class Dot{ TextBox txt; int max = 0;
public Dot(int max, TextBox txt) { this.max = max; this.txt = txt; }
public void ShowDot() { for (int i = 0; i < max; i++) { txt.BeginInvoke((() => { txt.Text += "."; })); System.Threading.Thread.Sleep(10); } }}
private void btnStart_Click(object sender, EventArgs e){ Dot d = new Dot(10, txtValue); Thread t1 = new Thread(d.ShowDot); t1.Start();}
可以使用lock關鍵字來進行加鎖操作
如果鎖定了一個對象,需要訪問該對象的所有其他線程則會處于阻塞狀態,并等待直到該對象解除鎖定。這,可能會導致嚴重的性能問題。
public class Dot{ private readonly object lockObj = new object(); TextBox txt; int max = 0;
public Dot(int max, TextBox txt) { this.max = max; this.txt = txt; }
public void ShowDot() { lock (lockObj) { for (int i = 0; i < max; i++) { txt.BeginInvoke((() => { txt.Text += "."; })); System.Threading.Thread.Sleep(10); } } }}
該文章在 2024/3/31 1:10:28 編輯過
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