asp-对于未绑定到 ViewModel 的输入

Question

我有一个使用 asp-for 属性的简单表单。

@using System.Threading.Tasks
@using MyApp.Controllers
@using MyApp.Models.Login
@model MyApp.Models.Login.LoginModel

<form asp-controller="Login" asp-action="Login" asp-route-returnUrl="@ViewBag.ReturnUrl" method="post" class="form-horizontal" role="form">
  <div class="form-group">
    <label class="col-md-2 control-label">UserName</label>
    <div class="col-md-6">
      <input asp-for="Username" class="form-control"/>
      <span asp-validation-for="Username" class="text-danger"></span>
    </div>
  </div>
  <div class="form-group">
    <label class="col-md-2 control-label">Password</label>
    <div class="col-md-6">
      <input asp-for="Password" type="password" class="form-control"/>
      <span asp-validation-for="Password" class="text-danger"></span>
    </div>
  </div>
  <div class="form-group">
    <div class="col-md-offset-2 col-md-1">
      <button type="submit" class="btn btn-primary">Log in</button>
    </div>
    <div class="col-md-offset-2 col-md-3">
      <a href="/ForgotPassword" class="pull-right">Forgot password?</a>
    </div>
  </div>
</form>

我的控制器有一个接受 LoginModel 的操作，但是当我单击提交时属性为空。

[AllowAnonymous]
[HttpPost("/Login")]
public async Task<IActionResult> Login(LoginModel lm, string returnUrl)
{
    //lm.Username and lm.Password are null
    //...
}

这是登录模型：

public class LoginModel
{
    [Required(ErrorMessage = "Username is required", AllowEmptyStrings = false)]
    public string Username { get; set; }

    [Required(ErrorMessage = "Password is required", AllowEmptyStrings = false)]
    public string Password { get; set; }
}

我正在使用 ASP.NET Core 1.0 RTM。这是我的 project.json:

"buildOptions": {
    "emitEntryPoint": true,
    "preserveCompilationContext": true
},
"dependencies": {
"EspritWeb.Services": "1.0.0-*",
"Microsoft.AspNetCore.Authentication.Cookies": "1.0.0",
"Microsoft.AspNetCore.Authorization": "1.0.0",
"Microsoft.AspNetCore.Diagnostics": "1.0.0",
"Microsoft.AspNetCore.Hosting": "1.0.0",
"Microsoft.AspNetCore.Hosting.Abstractions": "1.0.0",
"Microsoft.AspNetCore.Http.Extensions": "1.0.0",
"Microsoft.AspNetCore.Localization": "1.0.0",
"Microsoft.AspNetCore.Mvc": "1.0.0",
"Microsoft.AspNetCore.Routing": "1.0.0",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.0",
"Microsoft.AspNetCore.Session": "1.0.0",
"Microsoft.AspNetCore.StaticFiles": "1.0.0",
"Microsoft.Extensions.Caching.SqlServer": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0"
},

"frameworks": {
    "netcoreapp1.0": {
         "dependencies": {
             "Microsoft.NETCore.App": {
             "type": "platform",
             "version": "1.0.0"
             }
        }
    }
},

"runtimes": {
    "win10-x64": {}
}

知道我为什么会出现这种行为吗？谢谢！

Answer 1

确保您在 Views/Shared 文件夹中有一个 _ViewImports.cshtml，并确保在该文件中注册了 taghelpers

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

asp-对于未绑定到 ViewModel 的输入

asp-for inputs not binding to ViewModel

c#

asp.net

model-binding

asp.net-core