C# - 如果用户在插入记录后刷新页面，则会创建重复记录。我怎样才能防止这种情况发生？

Question

页面上存在的任何其他功能都是如此。我不希望在回发之前发生的最后一个事件再次发生。

Answer 1

我相信你应该看看 PRG Pattern (发布/重定向/获取)

Post/Redirect/Get (PRG) is a common design pattern for web developers to help avoid certain duplicate form submissions and allow user agents to behave more intuitively with bookmarks and the refresh button

在 ASP.NET 中:

1. POST - 点击提交按钮导致 HTTP POST
2. 重定向 + 获取 - HttpResponse.Redirect()

MSDN，Redirecting Users to Another Page

In server code, you can programmatically redirect by calling the Redirect method. The method sends a command to the user's browser that causes the browser to issue an HTTP GET command for the target page.

关于 PRG 模式的一些重要说明:

!!! The PRG pattern cannot address every scenario of duplicate form submission. Some known duplicate form submissions that PRG cannot solve are:

• if a web user goes back to the web form and resubmits it.
• if a web user clicks a submission button multiple times before the server response loads (may be prevented by using JavaScript to disable the button after the first click).
• if a web user refreshes before the initial submission has completed because of server lag, resulting in a duplicate HTTP POST request in certain user agents.
• if a malicious web user submits the form twice despite client-side safeguards and typical browser behavior.