ASP.NET Core-发布后更改表单值

我可能会遗漏一些非常明显的东西，但是我想要做的就是拥有一个简单的表单，允许它进行POST，更改其中一个字段，当它返回时，应该向我显示更改后的值.很简单，对吧?

I'm probably missing something very obvious, but all I'm trying to do is have a simple form, allow it to POST, change one of the fields, and when it returns it should show me the changed value. Simple, right?

模型如下:

public class TestModel
{
    public string Field1 { get; set; }
    public string Field2 { get; set; }
}

控制器动作:

public IActionResult Test()
{
    return View(new TestModel());
}

[HttpPost]
public IActionResult Test(TestModel model)
{
    model.Field1 = "changed"; // this seems to be ignored
    return View(model);
}

视图:

@model AspNetCoreTest1.Models.TestModel
<form method="post" asp-controller="Home" asp-action="Test">
    <input asp-for="Field1" />
    <br />
    <input asp-for="Field2" />
    <br />
    <button type="submit">Send</button>
</form>

我可以看到该表格并将其回发(我可以看到我在模型中键入的值)，但是在POST之后，该表格仍显示我键入的值.对于第一个字段，它不会显示changed.

I can see the form and it POSTs back (I can see the values I typed in the model), but after the POST the form still shows the values I typed. It does NOT show changed for the first field.

(我正在使用ASP.NET Core 1.1)

(I'm using ASP.NET Core 1.1)

有想法吗?