我正在尝试转换两个不同的 .txt
文件从小写到大写,主要目的是测量和显示执行时间。
如果文件以大写保存在我预定义的路径中,一切都很顺利,程序也会显示执行时间。然而在我的GUI中,由于文本框中的以下异常,文本无法转换。
System.InvalidOperationException: Cross-thread operation not valid: Control "textBox2" accessed from a thread other than the thread it was created on.
namespace Threads
{
public partial class Form1 : Form
{ String prim= @"C:\Users\Wheelz\Desktop\Laborator09\fis1.txt";
String secund= @"C:\Users\Wheelz\Desktop\Laborator09\fis2.txt";
public Form1()'
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var read = File.ReadAllText(prim);
textBox1.Text = read;
}
private void button2_Click(object sender, EventArgs e)
{
var read = File.ReadAllText(secund);
textBox2.Text = read;
}
private void modifica1()
{
var read = File.ReadAllText(prim);
read = read.ToUpper();
File.WriteAllText(@"C:\Users\Wheelz\Desktop\Laborator09\fis1upper.txt", read);
textBox1.Text = textBox1.Text.ToUpper();
}
private void modifica2()
{
var read = File.ReadAllText(prim);
read = read.ToUpper();
File.WriteAllText(@"C:\Users\Wheelz\Desktop\Laborator09\fis2upper.txt", read);
textBox2.Text = textBox2.Text.ToUpper() ;
}
private void timp_Click(object sender, EventArgs e)
{
Thread firstThread = new Thread(new ThreadStart(modifica1));
Thread secondThread = new Thread(new ThreadStart(modifica2));
var ceas= new Stopwatch();
ceas.Start();
firstThread.Start();
secondThread.Start();
ceas.Stop();
if (ceas.ElapsedMilliseconds == 1)
{
cron.Text = ceas.ElapsedMilliseconds.ToString() + " milisecundă";
}
else
{
if ((ceas.ElapsedMilliseconds < 20))
cron.Text = ceas.ElapsedMilliseconds.ToString() + " milisecunde";
else
cron.Text = ceas.ElapsedMilliseconds.ToString() + " de milisecunde";
}
}
}
}
使用 "BeginInvoke "来更新线程中的控制值,比如......。
private void modifica1()
{
var read = File.ReadAllText(prim);
read = read.ToUpper();
File.WriteAllText(@"C:\Users\Wheelz\Desktop\Laborator09\fis1upper.txt", read);
this.BeginInvoke(new MethodInvoker(() =>
{
textBox1.Text = textBox1.Text.ToUpper();
}));
}
private void modifica2()
{
var read = File.ReadAllText(prim);
read = read.ToUpper();
File.WriteAllText(@"C:\Users\Wheelz\Desktop\Laborator09\fis2upper.txt", read);
this.BeginInvoke(new MethodInvoker(() =>
{
textBox2.Text = textBox2.Text.ToUpper();
}));
}