ConnectionString 属性尚未使用 ADO 和 NET 5.0 初始化

Question

我正在使用 VS 2019，SQL Server 2016，我尝试使用 ADO.NET 更新注册表，但出现错误：

ConnectionString 属性尚未初始化

控制器：

如果我用这个：

con = new SqlConnection(ConfigurationManager.ConnectionStrings["DevConnection"].ConnectionString);

我收到错误：

Object reference not set to an instance of an object.'

如果我使用：

con = new SqlConnection(appSettings.Value.DbConnection);

我得到：

The ConnectionString property has not been initialized.

其余代码：

 cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@UserId", Convert.ToInt32(user.UserId));
                cmd.Parameters.AddWithValue("@DateOfBirth", user.DateOfBirth);
                cmd.Parameters.AddWithValue("@UserNames", user.UserNames);
                cmd.Parameters.AddWithValue("@UserLastNames", user.UserLastNames);
                cmd.Parameters.AddWithValue("@UserPlatformName", user.UserPlatformName);
                cmd.Parameters.AddWithValue("@UserPassword", user.UserPassword);
                cmd.Parameters.AddWithValue("@UserGender", user.UserGender);
                cmd.Parameters.AddWithValue("@UserDocumentNumber", Convert.ToInt32(user.UserDocumentNumber));
                 con.Open();
                result = cmd.ExecuteScalar().ToString();
                message.Data = result.ToString();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);            
                message.Data = e.Message;
            }
            finally
            {
                con.Close();
            }

Class 获取连接：

public class MySettings
{
    public string DbConnection { get; set; }
}

启动时：

services.Configure<MySettings>(Configuration.GetSection("ConnectionStrings"));

程序：

ALTER PROCEDURE [dbo].[SPUpdateUser]
    (@UserId INTEGER,
     @DateOfBirth DATE,
     @UserNames NVARCHAR(30),
     @UserLastNames NVARCHAR(30), 
     @UserPlatformName VARCHAR(30),
     @UserPassword NVARCHAR(15),
     @UserGender NVARCHAR(9),
     @UserDocumentNumber INTEGER)
AS
BEGIN
    SET NOCOUNT ON;

    UPDATE Users
    SET DateOfBirth = @DateOfBirth,
        UserNames = @UserNames,
        UserLastNames = @UserLastNames,
        UserPlatformName = @UserPlatformName,
        UserPassword = @UserPassword,
        UserGender = @UserGender,
        UserDocumentNumber = @UserDocumentNumber
    WHERE  
        UserId = @UserId                
END

在 Postman 中，我正在发送：

{
            "userId": 1,
            "dateOfBirth": "1980-1-1",
            "userNames": "James",
            "userLastNames": "Rodriguez",
            "userPlatformName": "1",
            "userPassword": "1234",
            "userGender": "Masculino",
            "userDocumentNumber": 1,
            "relatives": []
        }

这两个整数有它们的转换，所以...为什么会出现此错误？

我该如何解决这个问题？

项目编译成功，我在VS中没有看到错误

appsettings.json

 "ConnectionStrings": {
    "DevConnection": "Data Source=DESKTOP-ARVMMP2\SQLEXPRESS;Initial Catalog=PraxedesDb;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False"
  },

Answer 1

ConfigurationManager 不适用于 ASP.NET 核心中的 appsettings.json，您可以使用 IConfiguration 而不是 ConfigurationManager，如下所示：

public class HomeController : Controller
{
    private readonly IConfiguration Configuration;

    public HomeController(IConfiguration Configuration)
    {
        this.Configuration = Configuration;
    }
    public async Task<IActionResult> Index()
    {
        var con = new SqlConnection(Configuration.GetConnectionString("DevConnection"));
        
        return View();           
    }
}

ConnectionString 属性尚未使用 ADO 和 NET 5.0 初始化

The ConnectionString property has not been initialized using ADO and NET 5.0

sql-server

ado.net

stored-procedures

controller

asp.net-core

ConnectionString 属性 尚未使用 ADO 和 NET 5.0 初始化

The ConnectionString property has not been initialized using ADO and NET 5.0

sql-server

ado.net

stored-procedures

controller

asp.net-core

ConnectionString 属性尚未使用 ADO 和 NET 5.0 初始化