如何在 forloop 停止后运行代码
本文关键字:运行 代码 forloop | 更新日期: 2023-09-27 18:36:36
嗨,是否可以在 3 次失败尝试后显示一个消息框以显示引脚。目前,我希望我的代码做的是,在 3 次失败的尝试后,它将更新数据库中的新随机引脚。因此,当它被更新时,我想显示一个消息框,显示已发送新的引脚。所以这是我当前的代码。
string[] pinArray = new string[3];
private void PinError()
{
for (int i = 0; i < pinArray.Length; i++)
{
if (pinArray[i] != null)
{
string strConnectionString = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;
SqlConnection myConnect = new SqlConnection(strConnectionString);
SqlCommand cmd = new SqlCommand("Update PostParcel set Pin=@pin1 where Box='1'and Pin!= '' ", myConnect);
cmd.Parameters.AddWithValue("@pin1", RandomNumber(1000, 9999));
myConnect.Open();
cmd.ExecuteNonQuery();
myConnect.Close();
}
else if (pinArray[i] == null)
{
pinArray[i] = txtpBox1.Text;
MessageBox.Show("Invalid Pin. Pin Will Change After " + (3 - i) + " More Attempts");
break;
}
}
}
我试过放置
MessageBox.Show("Invalid Pin. New Pin Has Been Sent.");
break;
在末尾的"if{}"部分中。但是尝试第二次失败的尝试,它将显示消息框"无效的 Pin。新图钉已发送。这让我意识到,在第二次尝试时,"如果"会运行。因此,从技术上讲,引脚在第二次尝试时已经更改了。是否可以在第二次尝试之前不让它更改,直到第三次尝试,并在引脚更新时显示消息框?
我也尝试添加
if (i == 2) continue;
到
if (pinArray[i] != null){ **if (i == 2) continue;** }
但在第二次尝试时,它只会显示已发送新引脚
附言,对不起,如果这个问题以前已经回答过。并提前感谢您的帮助。
我有点只是这样做的
if (pinArray[i] != null)
{
if (i == 2) continue;
string strConnectionString = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;
SqlConnection myConnect = new SqlConnection(strConnectionString);
SqlCommand cmd = new SqlCommand("Update PostParcel set Pin=@pin1 where Box='1'and Pin!= '' ", myConnect);
cmd.Parameters.AddWithValue("@pin1", RandomNumber(1000, 9999));
myConnect.Open();
cmd.ExecuteNonQuery();
myConnect.Close();
MessageBox.Show("Invalid Pin. New Pin Has Been Sent");
break;
}
在分配引脚时设置bool
:
for (int i = 0; i < pinArray.Length; i++)
{
if (pinArray[i] != null)
{
string strConnectionString = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;
SqlConnection myConnect = new SqlConnection(strConnectionString);
SqlCommand cmd = new SqlCommand("Update PostParcel set Pin=@pin1 where Box='1'and Pin!= '' ", myConnect);
cmd.Parameters.AddWithValue("@pin1", RandomNumber(1000, 9999));
myConnect.Open();
cmd.ExecuteNonQuery();
myConnect.Close();
assigned = true;
}
}
if (!assigned)
{
pinArray[i] = txtpBox1.Text;
MessageBox.Show("Invalid Pin. A new one will be assigned");
break;
}
假设您为每个输入错误的引脚调用PinError()
,请尝试以下代码
int i = 1;
private void PinError()
{
if(i != 3)
{
MessageBox.Show("Invalid Pin. Pin Will Change After " + (3 - i) + " More Attempts");
i++;
return;
}
string strConnectionString = ConfigurationManager.ConnectionStrings["DatabaseConnectionString"].ConnectionString;
SqlConnection myConnect = new SqlConnection(strConnectionString);
SqlCommand cmd = new SqlCommand("Update PostParcel set Pin=@pin1 where Box='1'and Pin!= '' ", myConnect);
cmd.Parameters.AddWithValue("@pin1", RandomNumber(1000, 9999));
myConnect.Open();
cmd.ExecuteNonQuery();
myConnect.Close();
MessageBox.Show("Invalid Pin. New Pin Has Been Sent");
}
您可以在 elseif 表达式中添加一个额外的条件来检查循环的索引。它小于 2(因为您开始索引为 0,并且您有 3 个循环)您不会显示弹出窗口。如下所示:
else if (pinArray[i] == null && **i > 2**)
{
pinArray[i] = txtpBox1.Text;
MessageBox.Show("Invalid Pin. Pin Will Change After " + (3 - i) + " More Attempts");
break;
}