我正在尝试学习 MVC 和 Razor 页面(我是 Web 开发的新手),并且由于 RouteData 为空,我在 Post 上遇到了 NullReferenceException。我在 Get 上没有这个问题。该页面正常加载,但只要我单击“过滤器”按钮,就会显示异常。我什至无法调试 OnPostAsync,因为它甚至没有进入方法。这是我的页面:
<div class="row">
<div class="col-md-4">
<form method="post">
<div class="form-group">
<label asp-for="Input.UserName" class="control-label"></label>
<input asp-for="Input.UserName" class="form-control" />
</div>
<div class="form-group">
<label asp-for="Input.Email" class="control-label"></label>
<input asp-for="Input.Email" class="form-control" />
</div>
<div class="form-group">
<input type="submit" value="Filter" class="btn btn-default" />
</div>
</form>
</div>
</div>
<table class="table">
<thead>
<tr>
<th>
@Html.DisplayNameFor(model => model.UserList[0].UserName)
</th>
<th>
@Html.DisplayNameFor(model => model.UserList[0].Email)
</th>
</tr>
</thead>
<tbody>
@foreach (var item in Model.UserList)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.UserName)
</td>
<td>
@Html.DisplayFor(modelItem => item.Email)
</td>
</tr>
}
</tbody>
</table>
这是代码:
public class UsersModel : PageModel
{
[BindProperty]
public _userModel _UserModel { get; set; }
[BindProperty]
public InputModel Input { get; set; }
internal IList<_userModel> userList = new List<_userModel>();
public IList<_userModel> UserList { get => userList; set => userList = value; }
public class InputModel
{
[Display(Name = "Username")]
public string UserName { get; set; }
[Display(Name = "Email")]
public string Email { get; set; }
}
public async Task<IActionResult> OnGetAsync()
{
//Add all users to UserList
return Page();
}
public async Task<IActionResult> OnPostAsync()
{
//Filter UserList
return Page();
}
}