TempData持久性

Question

我最近一直在与TempData一个令人困惑的案件打交道：

假设TempData在以下操作中创建了：

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

并预期将在以下操作中使用：

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

我了解，如果我调用MyAction2下一个请求，则该TempData值将被删除。但是，如果我调用其他操作，而不是MyAction2在下一个请求时会TempData被删除？如果可以的话，是否有任何技巧可以确保它在会话结束之前一直存在？

谢谢大家

Answer 1

在这里，您可以获取Keep和Peek Temp数据以用于下一个请求：

如果您不会阅读“温度数据”，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！