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我的目标是让用户将文件上传到服务器，将文件保存在本地（在服务器上）并在模型中保留带有本地文件路径的属性，向用户返回不同的视图，然后返回到控制器/模型仍然具有文件路径的服务器。我的代码看起来像这样：

我的模型：

public class MyModel
{
  public IFormFile MyFile { get; set; }
  public string LocalFilePath { get; set; }
  
  public void CopyFileLocally(ref string err)
  { 
    try
    {
        var stream = System.IO.File.Create($"PathToSaveFile/{this.MyFile.FileName}");
        stream.Position = 0;
        this.DatFile.CopyTo(stream);
        stream.Flush();
        this.LocalFilePath = $"PathToSaveFile/{this.MyFile.FileName}";
    }
    catch (Exception ex)
    {
        err = ex.Message;
        return;
    }
  }
}

我的控制器：

public class MyController
{
  public IActionResult UploadFile(MyModel model)
  {
    string err = null;
    model.CopyFileLocally(ref err);
    if (err != null)
    {
        return Json(err);
    }
    return View("View2", model);
  }
  
  Public Void DoSomething(MyModel model)
  {
    // does something with model.LocalFilePath
  }

}

意见：

View1:
@model MyModel

@using (Html.BeginForm("UploadFile", "MyController", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
  <!---does a bunch of stuff and assigns a bunch of members--->
  @Html.TextBoxFor(model => model.MyFile, null, new { @type = "file", @class = "input-file", @enctype = "multipart/form-data" })
  
 <input type="submit" value="Send"/>
}

View2:
@model MyModel

@using (Html.BeginForm("DoSomething", "MyController", FormMethod.Post ))
{
  <!-- does a bunch of stuff and creates a bunch of hidden TextBoxFor elements to reassign model properties including file name as seen below--->
  @Html.TextBoxFor(model => model.LocalFilePath, new { @hidden = "hidden" })
  <input type="submit" value="Send"/>
}

问题是一旦调用 DoSomething 函数，所有其他属性都被分配，只有 LocalFilePath 属性为空。知道为什么吗？

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0 回答 0