juzi11qishui的专栏

private void button4_Click(object sender, EventArgs e) { int k = 0; for (int i = 0; i < s.stud.dt.Count; i++) { if (s.stud.dt[i].num == textBox4.Text) { s.stud.dt[i].name = textBox5.Text; s.stud.dt[i].dept = comboBox2.SelectedItem.ToString(); s.stud.dt[i].sex = radioButton3.Checked ? "男" : "女"; k = 1; } } if (k == 1) { if (s.stud.dt.Count != 0) { string strin = s.stud.dt[0].num + " " + s.stud.dt[0].name + " " + s.stud.dt[0].dept + " " + s.stud.dt[0].sex; File.WriteAllText("D://Student.txt", strin + "\r\n"); for (int i = 1; i < s.stud.dt.Count - 1; i++) { string str = s.stud.dt[i].num + " " + s.stud.dt[i].name + " " + s.stud.dt[i].dept + " " + s.stud.dt[i].sex; File.AppendAllText("D://Student.txt", str + "\r\n"); } string stri = s.stud.dt[s.stud.dt.Count - 1].num + " " + s.stud.dt[s.stud.dt.Count - 1].name + " " + s.stud.dt[s.stud.dt.Count - 1].dept + " " + s.stud.dt[s.stud.dt.Count - 1].sex; File.AppendAllText("D://Student.txt", stri); } else File.WriteAllText("D://Student.txt", ""); MessageBox.Show("修改成功！"); } else MessageBox.Show("修改失败！"); textBox4.Text = ""; textBox5.Text = ""; textBox6.Text = ""; } private void button5_Click(object sender, EventArgs e) { textBox4.Text = ""; textBox5.Text = ""; textBox6.Text = ""; } private void button7_Click(object sender, EventArgs e) { richTextBox1.Text = ""; for (int i = 0; i < s.stud.dt.Count; i++) { richTextBox1.Text += s.stud.dt[i].num +" "+ s.stud.dt[i].name+" " + s.stud.dt[i].sex +" "+ s.stud.dt[i].dept + "\n"; } } private void richTextBox1_TextChanged(object sender, EventArgs e) { } private void button6_Click(object sender, EventArgs e) { richTextBox1.Text = ""; string num1 = textBox7.Text; int ss=1; for (int i = 0; i < s.stud.dt.Count; i++) { if (num1 == s.stud.dt[i].num) { ss=0; richTextBox1.Text += s.stud.dt[i].num + " " + s.stud.dt[i].name + " " + s.stud.dt[i].sex + " " + s.stud.dt[i].dept + "\n"; } } if (ss == 1) richTextBox1.Text = "该用户不存在"; }