ASP.NET MVC-视图呈现的值不存在吗？

Question

I have this:

model.PasswordField = null;
return View("MainLogin", model);

My model contains LoginField and PasswordField . I leave LoginField untouched, but I erase PasswordField . Now, when MainLogin view is rendered, the field password has a value from my previous request! Why?

Update: Added my view code:

<div class="editor-field">
                @Html.TextBoxFor(model => model.PasswordField, new { placeholder = "Password" })
                @Html.ValidationMessageFor(model => model.PasswordField)
            </div>

Answer 1

You are changing the value in the Model but the HtmlHelper methods check the ModelState first to display the value, on postback. This is by design. To display the modified value, you need to clear the ModelState using,

ModelState.Clear();

Answer 2

in the load of your form you can create a function clean() where you put an initialization of field you want to be empty for example

clean()
{

textlabel.setvalue="enter text ";
field1.empty();

passwordField.empty();
}