易忘

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progressBar1控件:

progressBar1.PerformStep();
progressBar1.Maximum = 100;

progressBar1.Minimum = 0;

        private void timer1_Tick(object sender, EventArgs e)
        {
            this.label1.Text = System.DateTime.Now.ToString();
            if (progressBar1.Value < 100)
            {
                this.progressBar1.Value += 1;
            }
            this.progressBar1.Increment(5);
            if (progressBar1.Value >= 100)
            {
                this.timer1.Stop();
                MessageBox.Show("显示完毕！");
                return;
            }
        }

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事件与委托

创建代理
delegate void SetTextCallback(string text);

创建和启动线程
this.demoThread =
               new Thread(new ThreadStart(this.ThreadProcUnsafe));
                this.demoThread.Start();

线程中要求改主窗体UI中的text属性
private void ThreadProcSafe()
         {
             this.SetText("This text was set safely.");
         }

调用窗体中的函数用invoke传递参数
private void SetText(string text)
         {
            if (this.textBox1.InvokeRequired)
             {
                 SetTextCallback d = new SetTextCallback(SetText);
                 this.Invoke(d, new object[] { text });
             }
             else
             {
                 this.textBox1.Text = text;
             }
         }

================================

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C#连接Access数据库

strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "//book.mdb";

将Access的宏设置为最低,否则提示错误.

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