临时数据持久化

Question

我最近一直在与TempData 合作并面临一个令人困惑的案例：

假设TempData是在以下Action中创建的：

public ActionResult MyAction1()
{
  //...
  myTempData = TempData["myTempData"];
  //..
}

预计将用于以下操作：

public ActionResult MyAction2()
{
  //...
  TempData["myTempData"] = myTempData;
  //..
}

我了解，如果我在下一个请求中调用 MyAction2，TempData 的值将被删除。但如果我在下一个请求中调用其他操作，而不是 MyAction2，TempData 会被删除吗？如果会，是否有任何技巧可以确保它存在到会话结束？

谢谢大家。

Answer 1

您可以在此处获取 Keep 和 Peek Temp Data For next Request：

如果你不读取临时数据，那么它将可用于下一个后续请求

So let’s discuss these four conditions in more detail

“Tempdata helps to preserve values for a single request”.

The other half-truth which developers do not know is or I will say which confuses developer is:

“TempData CAN ALSO preserve values for the next request depending on 4 conditions”..

1. Not Read
2. Normal Read
3. Read and Keep
4. Peek and Read


Condition 1 (Not read): If you set a “TempData” inside your action and if you do not read it in your view, then “TempData” will be persisted for the next request.

Condition 2 (Normal Read): If you read the “TempData” normally like the below code, it will not persist for the next request.

stringstr = TempData["MyData"];
Even if you are displaying, it’s a normal read like the code below:


@TempData["MyData"];
Condition 3 (Read and Keep): If you read the “TempData” and call the “Keep” method, it will be persisted.


@TempData["MyData"];
TempData.Keep("MyData");
Condition 4 ( Peek and Read): If you read “TempData” by using the “Peek” method, it will persist for the next request.


stringstr = TempData.Peek("Td").ToString();

干杯！！

Answer 2

TempData["myTempData"]

1) TempData 仅在操作到操作时持久化，假设 action1 调用您已将数据存储到 TempData["myTempData"] 那么您需要访问数据在 action2 将持续存在。

2) 如果您想将数据存储在 TempData["myTempData"] 中，那么在每个操作中首先分配 TempData["myTempData"] 的值TempData["myTempData"] 然后在每个操作中使用它，直到您将其强制删除。

希望查询能得到解决。