保持按钮点击次数跟踪 [英] Keeping track of number of button clicks

问题描述

让我们假设我有一个CAPTCHA图像的页面。

Let us assume that I have a page with a CAPTCHA image.

我想，让用户尝试输入code 3次，否则他是不允许这样做了。

I want to let the user try to enter the code for three times, otherwise he is not allowed to do it anymore.

我如何跟踪次数的确认按钮被点击。 确认按钮，必须执行回发到服务器的每被点击一次。

How can I keep track of the number of times the "Confirm" button has been clicked. The "Confirm" button has to perform a postback to the server every time it is clicked.

使用JavaScript不好，因为，如果用户重新加载网页时，计数器将被设置为零。如何才能做到这一点吗？

Using JavaScript is not good since if the user reloads the page, the counter would be set to zero. How can this be done please?

推荐答案

这应该是pretty直线前进。第一计数器设为零，然后更新其上随后的后背上：

This should be pretty straight forward. First set the counter to zero, and then update it on subsequent post backs:

if (!this.IsPostBack) { Session["RetryCount"] = 1; }
else
{
    int retryCount = (int)Session["RetryCount"];
    if (retryCount == 3) { // do something because it's bad }
    else { retryCount++; Session["RetryCount"] = retryCount; }
}

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