C# InvalidOperationException:不正确的内容类型：ASP.NET核心_C#_Asp.net_Asp.net Core_.net Core

C# InvalidOperationException:不正确的内容类型：ASP.NET核心

c# asp.net asp.net-core .net-core

C# InvalidOperationException:不正确的内容类型：ASP.NET核心,c#,asp.net,asp.net-core,.net-core,C#,Asp.net,Asp.net Core,.net Core,我有两个表格，一个用于登录，一个用于注册。它们都位于同一视图上，并且使用相同的模型。我正在和管理员一起处理表单提交我在访问登录页面时遇到以下错误 InvalidOperationException: Incorrect Content-Type: 完整错误日志：我在网上查过，找不到任何与我的问题直接相关的东西，而且我在C#/.NET Core方面的经验不足，无法理解导致问题的原因我的看法 @model PastPapers.Models.LoginModel @{ Layout

我有两个表格，一个用于登录，一个用于注册。它们都位于同一视图上，并且使用相同的模型。我正在和管理员一起处理表单提交

我在访问登录页面时遇到以下错误

InvalidOperationException: Incorrect Content-Type:

完整错误日志：

我在网上查过，找不到任何与我的问题直接相关的东西，而且我在C#/.NET Core方面的经验不足，无法理解导致问题的原因

我的看法

@model PastPapers.Models.LoginModel

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Login</title>
</head>

<body>
    <!-- Register form inside modal -->
    <div id="registerModal" class="">
        <div class="">
            <header class="">
                <span onclick="document.getElementById('registerModal').style.display = 'none'" class="">&times;</span>
                <h2>Register</h2>
            </header>
            <div class="">
                <form asp-controller="Login" asp-action="AttemptRegister" method="post">
                    <input asp-for="newUsername" type="text" placeholder="Username" />
                    <input asp-for="newEmail" type="email" placeholder="Email" />
                    <input asp-for="newPassword" type="password" placeholder="Password" />
                    <input type="submit" value="Register" />
                </form>
            </div>
        </div>
    </div>

    <!-- Login form -->
    <form asp-controller="Login" asp-action="AttemptLogin" method="post">
        <input asp-for="username" type="text" placeholder="Username" />
        <input asp-for="password" type="password" placeholder="Password" />
        <input type="submit" value="Login" />
    </form>

    <button onclick="document.getElementById('registerModal').style.display='block'" class="">Register</button>
</body>
</html>

我的模型

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using Newtonsoft.Json;
using PastPapers.Helpers;
using Microsoft.AspNetCore.Http;

namespace PastPapers.Models
{
    public class LoginModel : HttpContextAccessor
    {
        public string username { get; set; }
        public string password { get; set; }
        public bool loginSuccess { get; set; }
        public string loginErrorMessage { get; set; }

        public string newUsername { get; set; }
        public string newPassword { get; set; }
        public string newEmail { get; set; }
        public bool registerSuccess { get; set; }
        public string registerErrorMessage { get; set; }

        [JsonIgnore]
        public AppDb Db { get; set; }

        public LoginModel(AppDb db = null)
        {
            Db = db;
            loginSuccess = false;
            registerSuccess = false;
        }

        public LoginModel()
        {

        }

        public void AttemptRegister()
        {
            try
            {
                Db.Connection.Open();

                string sql = "INSERT INTO users (id, username, password, email) VALUES (DEFAULT, @username, @password, @email)";
                MySqlCommand cmd = new MySqlCommand(sql, Db.Connection);
                cmd.Prepare();
                cmd.Parameters.AddWithValue("@username", newUsername);
                cmd.Parameters.AddWithValue("@password", SecurePasswordHasher.Hash(newPassword));
                cmd.Parameters.AddWithValue("@email", newEmail);

                if (cmd.ExecuteNonQuery() == 0)
                {
                    System.Diagnostics.Debug.WriteLine("Account failed to create!");
                    registerSuccess = false;
                } else
                {
                    registerSuccess = true;
                }

            } catch (Exception ex)
            {
                registerErrorMessage = "Error connecting to database";
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }
        }

        public void AttemptLogin()
        {
            try
            {
                Db.Connection.Open();

                string sql = "SELECT password FROM users WHERE username=@username";
                MySqlCommand cmd = new MySqlCommand(sql, Db.Connection);
                cmd.Prepare();
                cmd.Parameters.AddWithValue("@username", username);
                MySqlDataReader reader = cmd.ExecuteReader();

                if (reader.Read())
                {
                    string dbPassword = reader.GetString(0);

                    if (SecurePasswordHasher.Verify(password, dbPassword))
                    {
                        loginSuccess = true;
                        HttpContext.Session.SetString("username", username);

                    } else
                    {
                        loginSuccess = false;
                        loginErrorMessage = "Incorrect password";
                    }
                } else
                {
                    loginErrorMessage = "Unknown username";
                }

            } catch (Exception ex)
            {
                loginErrorMessage = "Error connecting to database";
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }

        }
    }
}

将HttpContextAccessor的继承替换为IHttpContextAccessor，并添加了公共HttpContext属性。新型号如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using Newtonsoft.Json;
using PastPapers.Helpers;
using Microsoft.AspNetCore.Http;

namespace PastPapers.Models
{
    public class LoginModel : IHttpContextAccessor
    {
        public string username { get; set; }
        public string password { get; set; }
        public bool loginSuccess { get; set; }
        public string loginErrorMessage { get; set; }

        public string newUsername { get; set; }
        public string newPassword { get; set; }
        public string newEmail { get; set; }
        public bool registerSuccess { get; set; }
        public string registerErrorMessage { get; set; }

        [JsonIgnore]
        public AppDb Db { get; set; }
        public HttpContext HttpContext { get; set; }

        public LoginModel(AppDb db = null)
        {
            Db = db;
            loginSuccess = false;
            registerSuccess = false;
        }

        public LoginModel()
        {

        }

        public void AttemptRegister()
        {
            try
            {
                Db.Connection.Open();

                string sql = "INSERT INTO users (id, username, password, email) VALUES (DEFAULT, @username, @password, @email)";
                MySqlCommand cmd = new MySqlCommand(sql, Db.Connection);
                cmd.Prepare();
                cmd.Parameters.AddWithValue("@username", newUsername);
                cmd.Parameters.AddWithValue("@password", SecurePasswordHasher.Hash(newPassword));
                cmd.Parameters.AddWithValue("@email", newEmail);

                if (cmd.ExecuteNonQuery() == 0)
                {
                    System.Diagnostics.Debug.WriteLine("Account failed to create!");
                    registerSuccess = false;
                } else
                {
                    registerSuccess = true;
                }

            } catch (Exception ex)
            {
                registerErrorMessage = "Error connecting to database";
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }
        }

        public void AttemptLogin()
        {
            try
            {
                Db.Connection.Open();

                string sql = "SELECT password FROM users WHERE username=@username";
                MySqlCommand cmd = new MySqlCommand(sql, Db.Connection);
                cmd.Prepare();
                cmd.Parameters.AddWithValue("@username", username);
                MySqlDataReader reader = cmd.ExecuteReader();

                if (reader.Read())
                {
                    string dbPassword = reader.GetString(0);

                    if (SecurePasswordHasher.Verify(password, dbPassword))
                    {
                        loginSuccess = true;
                        HttpContext.Session.SetString("username", username);

                    } else
                    {
                        loginSuccess = false;
                        loginErrorMessage = "Incorrect password";
                    }
                } else
                {
                    loginErrorMessage = "Unknown username";
                }

            } catch (Exception ex)
            {
                loginErrorMessage = "Error connecting to database";
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }

        }
    }
}

我将放弃HttpContextAccessor（或者更确切地说是IHttpContextAccessor）的全部继承，因为您将失去具体HttpContextAccessor提供的功能。相反，将HttpContextAccessor注入控制器，然后使用登录模型上的操作结果来设置会话值。像这样：

在

启动.ConfigureServices

中添加此行：

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

然后将HttpContext作为参数传递到

LoginModel.AttemptLogin

。这样，您仍然可以满足访问HTTP变量的需求，并且代码更易于维护和预测

有一个警告-将HttpContextAccessor添加到服务中会对性能造成小的影响。但是总的来说更好。

为什么您的

LoginModel

继承自

HttpContextAccessor

？我知道您在哪里使用它，但这几乎肯定是您问题的原因。这样我就可以访问HTTP变量来设置用户名等。访问模型中会话变量的正确方法是什么？根据MS文档，永远不要将HttpContext保存到字段中，而只保存访问器本身。

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

public LoginController(IHttpContextAccessor contextAccessor)
{
    // save to a field, like _httpContext = contextAccessor.HttpContext;
}