Ошибка cs7036 отсутствует аргумент соответствующий требуемому формальному параметру

I have been refactoring one of my old MSSQL Connection helper library and I got the following error:

Error CS7036 There is no
argument given that corresponds to the required formal parameter
‘errorMsg’ of ‘ErrorEventArg.ErrorEventArg(string,
string)’ MSSQLTest C:UsersAdministratorDesktopMSSQLTestMSSQLTestMSSQLConnection.cs 61

This is my code so far:

MSSQLConnection.cs

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Threading;

namespace MSSQLTest
{
    public class ErrorEventArg : EventArgs
    {
        public string ErrorMsg { get; set; }
        public string LastQuery { get; set; }

        public ErrorEventArg(string errorMsg, string lastQuery)
        {
            ErrorMsg = errorMsg;
            LastQuery = lastQuery;
        }
    }

    public class MSSQLConnection
    {
        /// <summary>
        /// Private class objects.
        /// </summary>
        private SqlConnection sqlConnection;
        private int sqlCommandTimeout;
        private string lastQuery = string.Empty;

        /// <summary>
        /// Public event related objects & handler.
        /// </summary>
        public event ErrorHandler OnError;
        public delegate void ErrorHandler(MSSQLConnection sender, ErrorEventArg e);

        /// <summary>
        /// Class constructor.
        /// </summary>
        /// <param name="sqlConnection"></param>
        /// <param name="sqlCommandTimeout"></param>
        public MSSQLConnection(SqlConnection sqlConnection, Int32 sqlCommandTimeout = 120)
        {
            if (null == sqlConnection)
                throw new Exception("Invalid MSSQL Database Conection Handle");

            if (sqlConnection.State != System.Data.ConnectionState.Open)
                throw new Exception("MSSQL Database Connection Is Not Open");

            this.sqlConnection = sqlConnection;
            this.sqlCommandTimeout = sqlCommandTimeout;
        }

        /// <summary>
        /// Helper method to emit a database error to event subscribers.
        /// </summary>
        /// <param name="errorMsg"></param>
        internal void EmitError(String errorMsg)
        {
            var errorDelegate = OnError;
            if (errorDelegate != null)
            {
                errorDelegate(this, new ErrorEventArg() // Line #61
                {
                    ErrorMsg = errorMsg,
                    LastQuery = lastQuery
                });
            }
        }
        
        /// rest of the code snipped
    }
}

What does this error means & how do I fix it? I’ve not seen this error before…

I got the same error but it was due to me not creating a default constructor. If you haven’t already tried that, create the default constructor like this:

public TestClass()
{
}

I got this error when one of my properties that was required for the constructor was not public. Make sure all the parameters in the constructor go to properties that are public if this is the case:

using statements
namespace someNamespace

public class ExampleClass {

  //Properties - one is not visible to the class calling the constructor
  public string Property1 { get; set; }
  string Property2 { get; set; }

   //Constructor
   public ExampleClass(string property1, string property2)
  {
     this.Property1 = property1;
     this.Property2 = property2;  //this caused that error for me
  }
}

answered Oct 18, 2018 at 16:26

I received this same error in the following Linq statement regarding DailyReport. The problem was that DailyReport had no default constructor. Apparently, it instantiates the object before populating the properties.

var sums = reports
    .GroupBy(r => r.CountryRegion)
    .Select(cr => new DailyReport
    {
        CountryRegion = cr.Key,
        ProvinceState = "All",
        RecordDate = cr.First().RecordDate,
        Confirmed = cr.Sum(c => c.Confirmed),
        Recovered = cr.Sum(c => c.Recovered),
        Deaths = cr.Sum(c => c.Deaths)
    });

answered Mar 18, 2020 at 15:51

Ошибка:

CS7036 Отсутствует аргумент, соответствующий требуемому формальному
параметру «services» из «CommandService.AddModulesAsync(Assembly,
IServiceProvider)».

public class CommandHeadler {
    private DiscordSocketClient _client;

    private CommandService _service;
    public CommandHeadler(DiscordSocketClient client) {
        _client = client;

        _service = new CommandService();

        _service.AddModulesAsync(Assembly.GetEntryAssembly());

        _client.MessageReceived += HandleCommandAsync;
    }
    private async Task HandleCommandAsync(SocketMessage s) {
        var msg = s as SocketUserMessage;
        if (msg == null) return;

        var context = new SocketCommandContext(_client, msg);

        int argPos = 0;
        if (msg.HasCharPrefix('!', ref argPos)) {
            var result = await _service.ExecuteAsync(context, argPos);

            if (!result.IsSuccess && result.Error != CommandError.UnknownCommand) {
                await context.Channel.SendMessageAsync(result.ErrorReason);
            }

        }
    }
}

В ошибке указано, что функция принимает два аргумента

CommandService.AddModulesAsync(Assembly, IServiceProvider)

Ты передаешь только один

_service.AddModulesAsync(Assembly.GetEntryAssembly())

Нужно передавать два, второй параметр должен иметь тип IServiceProvider, если у тебя нет сервис провайдера можно передать null

_service.AddModulesAsync(Assembly.GetEntryAssembly(), null)

ответ дан 17 янв 2020 в 11:41