方法有多个返回值时我一般喜欢加out参数
private void button3_Click(object sender, EventArgs e)
{
int aa;
AddI(out aa);
textBox3.Text = aa.ToString();
}
private void AddI(out int vo)
{
int ss = Convert.ToInt32(textBox3.Text.Trim());
vo = ss + 2;
}
//textBox3+2
渐渐发现引用类型的参数不加out参数也是可以的,值类型就必须要加out
a、引用类型不加out
1 private void button2_Click(object sender, EventArgs e)
2 {
3 List<string> list = new List<string>();
4 AddList(list);
5
6 StringBuilder stringBuilder = new StringBuilder();
7 foreach (string ii in list)
8 {
9 stringBuilder.AppendLine(ii);
10 }
11 textBox2.Text += stringBuilder.ToString();
12 }
13
14 private void AddList(List<string> list)
15 {
16 list.Add("2");
17 list.Add("3");
18 }
//textBox2新增行2和3
b、值类型不加out
private void button1_Click(object sender, EventArgs e)
{
int ss = Convert.ToInt32(textBox1.Text.Trim());
Add(ss);
textBox1.Text = ss.ToString();
}
private int Add(int v)
{
return v += 2;
}
//textBox1结果不变
作者:꧁执笔小白꧂