重定向时将数组或字符串列表从一个动作传递到另一个动作 [英] Passing an array or list of strings from one action to another when redirecting

问题描述

我有一个后期操作导入:

I have a post action Import:

public ActionResult Import()
{
    var fileNames = new List<String>();

    foreach (string path in Directory.GetFiles(directoryPath))
    {
        //do a whole bunch of stuff
        ...
        fileNames.Add(path.Split('\\').Last());            
    }

    return RedirectToAction("Index", new { InvalidFiles = fileNames });
}

如您所见，它重定向到Index操作，并传递文件名List<String>

As you can see, it redirects to an Index action, passing the List<String> of file names

public ActionResult Index(List<String> InvalidFiles)
{
    return View();
}

在Index操作中，列表中包含正确数量的元素，但是所有实际字符串都已从文件名更改为字符串"System.Collections.Generic.List`1 [System.String]" .

In the Index action, the List comes in with the right amount of elements, however all the actual strings has been changed from the filename to the string "System.Collections.Generic.List`1[System.String]".

知道为什么会这样吗?是否有更好的方法(可能使用TempData)将列表传递给新操作?

Any idea why this is happening? Is there a better way to pass the list to the new action, possibly using TempData?

推荐答案

您可以使用

You can use TempData to temporally hold the data between actions.

public ActionResult Import()
{
    var fileNames = new List<String>();

    foreach (string path in Directory.GetFiles(directoryPath))
    {
        //do a whole bunch of stuff
        ...
        fileNames.Add(path.Split('\\').Last());            
    }

    TempData["fileNames"] = fileNames;

    return RedirectToAction("Index");
}


public ActionResult Index()
{
    var invalidFiles = TempData["fileNames"] as List<String>;

    return View();
}

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