这个问题通常是由于appsetting.json转换文件中的属性名称不匹配而导致的。例如，属性名称在源文件和转换文件中不一致。

针对这个问题，可以使用以下代码示例解决：

1.在 appsettings.Development.json 文件中定义以下内容：

{ "Logging": { "LogLevel": { "Default": "Information", "Microsoft": "Warning", "Microsoft.Hosting.Lifetime": "Information" } }, "AppSettings": { "Database": { "ConnectionString": "Server=(localhost);Database=MyDatabase;User Id=myuser;Password=mypassword" } } }

2.在 appsettings.Production.json 文件中定义以下内容：

{ "AppSettings": { "Database": { "ConnectionString": "Server=(prod-server);Database=MyDatabase;User Id=myuser;Password=mypassword", "UseConnectionPooling": true } } }

3. 然后，在 Startup.cs 文件中添加以下内容：

public Startup(IConfiguration configuration, IWebHostEnvironment env) { Configuration = configuration;

var builder = new ConfigurationBuilder() .SetBasePath(env.ContentRootPath) .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true) .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true) .AddEnvironmentVariables();

Configuration = builder.Build();

// Get the AppSettings section var appSettingsSection = Configuration.GetSection("AppSettings");

// Configure the database options services.Configure(appSettingsSection.GetSection("Database")); }

4.最后，在 ConfigureServices 方法中定义 DatabaseOptions，如以下代码所示：

public void ConfigureServices(IServiceCollection services) { services.AddDbContext(options => { options.UseSqlServer(Configuration.GetConnectionString("Database")); });

services.Configure(Configuration.GetSection("AppSettings:Database")); }

通过以上代码，添加的 Program.cs 的内容为：

using Microsoft.AspNetCore.Hosting; using Microsoft.Extensions.Configuration; using Microsoft.Extensions.Hosting; using Microsoft.Extensions.Logging;

namespace TestConfiguration