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选中该文本框，右击属性，里的tabIndex设为0，焦点就默认在这个文本框里了。
Formload里面添加：
比如编辑框的名字：textBox_password
this.BeginInvoke((MethodInvoker)delegate { textBox_password.Focus(); });
private void button_Search_Click(object sender, EventArgs e)
{
string str1;
// strDate= dateTimePicker1.ToString("yyyyMMdd");
str1 = dateTimePicker1.Value.ToString("yyyyMMdd");
str1 += ".txt";
textBox1.Text = "";
try
{
string[] ReadData = File.ReadAllLines(Application.StartupPath + "\\" + str1, Encoding.UTF8);
// textBox1.Text = ReadData[0];
for (int i = 0; i < ReadData.Length; i++)
{
textBox1.Text += ReadData[i];
textBox1.Text += "\r\n";
}
// textBox1.Select(0, 0);//光标停留的位置
// textBox1.Focus();//可以显示光标
// textBox1.SelectionStart = textBox1.Text.Length;
textBox1.Select(textBox1.Text.Length, 0);//光标停留在最后末尾
}
catch (Exception ex)
{
MessageBox.Show("所选日期无报警记录");
}
}
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