InvalidOperationException Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel(ModelBindingContext bindingContext)

Question

我正在尝试将复杂类型绑定到属性以编辑属性值并将更改保存在内存中，现在用于测试。

I get an exception when I execute Post.

这是我的编辑剃刀视图。

<h1>Edit:</h1>






        <form method="post">




        <label asp-for="EditClient.Name"> </label>
        <input asp-for="EditClient.Name"
               class="form-control"
               readonly="readonly" />



        <h3 class="text text-info">Pull Configuration</h3>
        <div>

            <label asp-for="EditClient.Pull.Protocol"> </label>
            <input asp-for="EditClient.Pull.Protocol" class="form-control" />
            <span asp-validation-for="EditClient.Pull.Protocol" class="text-danger"></span>

            <label asp-for="EditClient.Pull.Host"> </label>
            <input asp-for="EditClient.Pull.Host" class="form-control" />
            <span asp-validation-for="EditClient.Pull.Host" class="text-danger"></span>


            <label asp-for="EditClient.Pull.User"> </label>
            <input asp-for="EditClient.Pull.User" class="form-control" />
            <span asp-validation-for="EditClient.Pull.User" class="text-danger"></span>

            <label asp-for="EditClient.Pull.Password"> </label>
            <input asp-for="EditClient.Pull.Password" class="form-control" />
            <span asp-validation-for="EditClient.Pull.Password" class="text-danger"></span>


            <label asp-for="EditClient.Pull.PrivateKeyPath"> </label>
            <input asp-for="EditClient.Pull.PrivateKeyPath" class="form-control" />
            <span asp-validation-for="EditClient.Pull.PrivateKeyPath" class="text-danger"></span>

            <label asp-for="EditClient.Pull.Port"> </label>
            <input asp-for="EditClient.Pull.Port" class="form-control" />
            <span asp-validation-for="EditClient.Pull.Port" class="text-danger"></span>


            <label asp-for="EditClient.Pull.RemoteDirectory"> </label>
            <input asp-for="EditClient.Pull.RemoteDirectory" class="form-control" />
            <span asp-validation-for="EditClient.Pull.RemoteDirectory" class="text-danger"></span>


            <label asp-for="EditClient.Pull.IsDecrypt"> </label>
            <input asp-for="EditClient.Pull.IsDecrypt" class="form-control" />
            <span asp-validation-for="EditClient.Pull.IsDecrypt" class="text-danger"></span>



        </div>


        <h3 class="text text-info">Push Configuration</h3>
        <label asp-for="EditClient.Push.Protocol"> </label>
        <input asp-for="EditClient.Push.Protocol" class="form-control" />
        <span asp-validation-for="EditClient.Push.Protocol" class="text-danger"></span>

        <label asp-for="EditClient.Push.Host"> </label>
        <input asp-for="EditClient.Push.Host" class="form-control" />
        <span asp-validation-for="EditClient.Push.Host" class="text-danger"></span>


        <label asp-for="EditClient.Push.User"> </label>
        <input asp-for="EditClient.Push.User" class="form-control" />
        <span asp-validation-for="EditClient.Pull.User" class="text-danger"></span>

        <label asp-for="EditClient.Push.Password"> </label>
        <input asp-for="EditClient.Push.Password" class="form-control" />
        <span asp-validation-for="EditClient.Pull.Password" class="text-danger"></span>


        <label asp-for="EditClient.Push.PrivateKeyPath"> </label>
        <input asp-for="EditClient.Push.PrivateKeyPath" class="form-control" />
        <span asp-validation-for="EditClient.Pull.PrivateKeyPath" class="text-danger"></span>

        <label asp-for="EditClient.Push.Port"> </label>
        <input asp-for="EditClient.Push.Port" class="form-control" />
        <span asp-validation-for="EditClient.Pull.Port" class="text-danger"></span>


        <label asp-for="EditClient.Push.RemoteDirectory"> </label>
        <input asp-for="EditClient.Push.RemoteDirectory" class="form-control" />
        <span asp-validation-for="EditClient.Pull.RemoteDirectory" class="text-danger"></span>

        <label asp-for="EditClient.Push.IsZip"> </label>
        <input asp-for="EditClient.Push.IsZip" class="form-control" />
        <span asp-validation-for="EditClient.Push.IsZip" class="text-danger"></span>



        <label asp-for="EditClient.Push.IsEncrypt"> </label>
        <input asp-for="EditClient.Push.IsEncrypt" class="form-control" />
        <span asp-validation-for="EditClient.Push.IsEncrypt" class="text-danger"></span>

        <button type="submit">
            Submit
        </button>
    </form>







    This is my EditModel
    ``````````````````````````````````````````````````

    public class EditModel : PageModel
        {
            private readonly IClientConfiguration _config;



            [BindProperty(SupportsGet = false)]
            public ClientConfig EditClient { get; set; } 





            public EditModel(IClientConfiguration config)
            {
                this._config = config;

            }


            public IActionResult OnPost()
            {
                var _editedClient = 
                    new ClientConfig(this.EditClient.Name, this.EditClient.Email, this.EditClient.Push, this.EditClient.Pull);


                if(this._config.GetByName(_editedClient.Name) == null)
                {
                    this._config.Add(_editedClient);
                }
                else
                {
                    this._config.Edit(_editedClient);
                }

                return this.RedirectToPage("/DropBox/Detail", new { name = _editedClient.Name }); 
            }
            public IActionResult OnGet(string name)
            {
                this.EditClient = this._config.GetByName(name);


                return this.Page();
            }
        }









    This is my type
    ```````````````````````````````````````````````````````````
    [JsonObject]
        public class ClientConfig
        {

            [JsonProperty]
            public string Name { get; }

            [JsonProperty]
            public IEnumerable<string> Email { get; }


            [JsonProperty]
            public PushConfig Push { get; }

            [JsonProperty]
            public PullConfig Pull { get; }



            [JsonConstructor]
            public ClientConfig(string name, IEnumerable<string> email, PushConfig push, PullConfig pull)
            {
                this.Name = name;
                this.Email = email;
                this.Push = push;
                this.Pull = pull;
            }






        }


    This is my IClientConfig Interface and the class who implements it
    `````````````````````````````````````````````````````````````````````

     public class InMemoryClientConfig : IClientConfiguration
        {
            public List<ClientConfig> GetAll()
            {
                return this.LoadClientsConfig().Clients
                    .ToList();
            }
            public ClientConfig Add(ClientConfig clientConfig)
            {
                var allClients = this.GetAll();

                var exist = allClients.Contains(clientConfig);

                if(!exist)
                {
                    this.GetAll().Add(clientConfig);

                    return clientConfig;
                }

                return clientConfig; 


            }

            public ClientConfig Edit(ClientConfig clientConfig)
            {
                var _edit = this.GetByName(clientConfig.Name); 


                if (_edit != null)
                this.GetAll().Remove(_edit);

                this.GetAll()
                    .Add(new ClientConfig(clientConfig.Name, clientConfig.Email, clientConfig.Push, clientConfig.Pull));
                return clientConfig;
            }


            public ClientConfig Delete(int id)
            {
                throw new NotImplementedException();
            }



            Config LoadClientsConfig()
            {
                var deserialize = File.ReadAllText(@"C:\...\Path\ToJsonFile");
                return JsonConvert.DeserializeObject<Config>(deserialize);
            }
            public ClientConfig GetByName(string name)
            => this.GetAll
                     ().SingleOrDefault(x => x.Name == name);
        }

问题子源于 ClientConfig EditClient 属性位于 EditModel: PageModel class 第 18 行。

get 工作正常但是当我尝试 post 在表单页面上所做的更改时我得到 InvalidOperationException Could not create an instance of type 'ProjectName.Core.ClientConfig 模型绑定的复杂类型不能是抽象类型或值类型，并且必须具有无参数构造函数。或者，给 'EditClient' 参数一个非空的默认值。

我已经坚持了一天左右，并查看了其他堆栈问题及其答案，但我不理解所提供的答案和术语或示例。

对不起，如果我没有把我的问题说清楚，但这是我力所能及的。

如有任何帮助，我们将不胜感激。

再次感谢。

Answer 1

终于想通了。

执行以下操作， 1. 确保您的标签名称与您要绑定的属性匹配。 “

为您要绑定的类型重载一个空构造函数。
将绑定模型属性从 razor 视图作为参数传递给 Post 方法，并且不要忘记使用标签助手从 razor 视图传递它.
模型必须有Get；放;对于道具，你正在使用。
绑定模型属性，添加属性[BindProperty(Support Get= False)] 并确保你得到了；放;在上面。

如果您需要代码示例，请告诉我。

我希望这对某人有所帮助。沃拉！

InvalidOperationException Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel(ModelBindingContext bindingContext)

InvalidOperationException Microsoft.AspNetCore.Mvc.ModelBinding.Binders.ComplexTypeModelBinder.CreateModel(ModelBindingContext bindingContext)

c#

asp.net-core

razor-pages

defaultmodelbinder