问题[winforms]

请帮帮我，我已经为这个问题绞尽脑汁三天了。

我正在尝试编写一个带有内部数据库（SQLite）的WinForms应用程序，该数据库使用EntityFramework进行管理。问题是，当我尝试向表中添加记录时，出现以下异常：

“找不到具有固定名称“System.Data.SQLite”的 ADO.NET 提供程序的实体框架提供程序。请确保该提供程序已在应用程序配置文件的“entityFramework”部分中注册。请参阅http://go.microsoft。 com/fwlink/?LinkId=260882了解更多信息。”

这是 App.config 文件。

    <?xml version="1.0" encoding="utf-8"?>
<configuration>
  
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
  </startup>
  
  <entityFramework>
    <providers>
      <!-- Провайдер для SQL Server -->
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <!-- Провайдер для SQLite -->
      <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
    </providers>
  </entityFramework>

  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SQLite.EF6" />
      <add name="SQLite Data Provider (Entity Framework 6)"
           invariant="System.Data.SQLite.EF6"
           description=".NET Framework Data Provider for SQLite (Entity Framework 6)"
           type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" />
      <remove invariant="System.Data.SQLite" />
      <add name="SQLite Data Provider"
           invariant="System.Data.SQLite"
           description=".NET Framework Data Provider for SQLite"
           type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
    </DbProviderFactories>
  </system.data>

  <connectionStrings>
    <add name="FinanceHelperConnection"
         connectionString="Data Source=|DataDirectory|\FinanceHelperDB.sqlite;"
         providerName="System.Data.SQLite.EF6"/>
  </connectionStrings>
  
</configuration>

以下是应用程序中断的方法的代码：

private void createItemBtn_Click(object sender, EventArgs e)
    {
        if (itemNameField.Texts != "")
        {
            using (AppDbContext db = new AppDbContext())
            {
                Item newItem = new Item() { Name = itemNameField.Texts };
                db.Items.Add(newItem);
                db.SaveChanges();
                reloadData();
            }
        }
        else
        {
            MessageBox.Show("Стой, ты забыл заполнить поле 'Название'");
        }
    }

上下文类也是“经典”：

public class AppDbContext : DbContext
{
    public AppDbContext() : base("name=FinanceHelperConnection")
    {
    }

    public DbSet<Item> Items { get; set; }
    public DbSet<Category> Categories { get; set; }
    public DbSet<Transaction> Transactions { get; set; }
}

我已经通过管理器和控制台重新安装了库 100,500 次 - 它没有帮助（将它们更新到最新版本也没有帮助）。

这不是玩笑，但ChatGpt也挠头，以勤劳的啄木鸟的方式重复：“一切似乎都是正确的。检查你是否已经安装了库，如果需要，请重新安装它们。”请告诉我问题是什么以及如何解决？

我决定在教育机构编写课程项目并尝试正确地完成它，对于 C# + .NET Framework (WinForms) 上的小型应用程序，您会推荐哪种 MV * 模式？

开始调试时，窗体打开1毫秒，立即关闭，请帮忙。

ConsoleApplication1.cpp

#include "pch.h"

using namespace System;

int main(array<System::String ^> ^args)
{

   return 0;
}

MyForm.h

#pragma once

namespace ConsoleApplication1 {

    using namespace System;
    using namespace System::ComponentModel;
    using namespace System::Collections;
    using namespace System::Windows::Forms;
    using namespace System::Data;
    using namespace System::Drawing;

    /// <summary>
    /// Сводка для MyForm
    /// </summary>
    public ref class MyForm : public System::Windows::Forms::Form
    {
    public:
        MyForm(void)
        {
            InitializeComponent();
            //
            //TODO: добавьте код конструктора
            //
        }

    protected:
        /// <summary>
        /// Освободить все используемые ресурсы.
        /// </summary>
        ~MyForm()
        {
            if (components)
            {
                delete components;
            }
        }
    private: System::Windows::Forms::Button^ button1;
    private: System::Windows::Forms::ComboBox^ comboBox1;
    protected:

    private:
        /// <summary>
        /// Обязательная переменная конструктора.
        /// </summary>
        System::ComponentModel::Container ^components;

#pragma region Windows Form Designer generated code
        /// <summary>
        /// Требуемый метод для поддержки конструктора — не изменяйте 
        /// содержимое этого метода с помощью редактора кода.
        /// </summary>
        void InitializeComponent(void)
        {
            this->button1 = (gcnew System::Windows::Forms::Button());
            this->comboBox1 = (gcnew System::Windows::Forms::ComboBox());
            this->SuspendLayout();
            // 
            // button1
            // 
            this->button1->Location = System::Drawing::Point(89, 143);
            this->button1->Name = L"button1";
            this->button1->Size = System::Drawing::Size(75, 23);
            this->button1->TabIndex = 0;
            this->button1->Text = L"button1";
            this->button1->UseVisualStyleBackColor = true;
            // 
            // comboBox1
            // 
            this->comboBox1->FormattingEnabled = true;
            this->comboBox1->Location = System::Drawing::Point(89, 55);
            this->comboBox1->Name = L"comboBox1";
            this->comboBox1->Size = System::Drawing::Size(121, 21);
            this->comboBox1->TabIndex = 1;
            this->comboBox1->SelectedIndexChanged += gcnew System::EventHandler(this, &MyForm::comboBox1_SelectedIndexChanged);
            // 
            // MyForm
            // 
            this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
            this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
            this->ClientSize = System::Drawing::Size(284, 261);
            this->Controls->Add(this->comboBox1);
            this->Controls->Add(this->button1);
            this->Name = L"MyForm";
            this->Text = L"MyForm";
            this->ResumeLayout(false);

        }
#pragma endregion
    private: System::Void comboBox1_SelectedIndexChanged(System::Object^ sender, System::EventArgs^ e) {
    }
    };
}

Windows 窗体。我有一个数据网格视图。您可以将 Excel 电子表格上传到其中。加载后，可以删除一列，删除一行，改变列的位置。更改列的位置后 - 它不会在数据中更改，而只是在视觉上更改。如何解决？

我在编写游戏时遇到了问题。逻辑已准备就绪，即按钮随机生成 6 个点。（下图）必须使其有图像，而不是出现带有“目标”字样的按钮。按钮是通过定时器编写的，代码如下：

        {
            isHit = false;
            btn_click.Enabled = true;
            btn_click.BackColor = System.Drawing.Color.Transparent;

            locationNum = rnd.Next(1, 7);


            switch (locationNum)
            {
                case 1:
                    btn_click.Left = 186;
                    btn_click.Top = 297;
                    break;

                case 2:
                    btn_click.Left = 43;
                    btn_click.Top = 327;
                    break;

                case 3:
                    btn_click.Left = 325;
                    btn_click.Top = 333;
                    break;

                case 4:
                    btn_click.Left = 60;
                    btn_click.Top = 402;
                    break;

                case 5:
                    btn_click.Left = 309;
                    btn_click.Top = 406;
                    break;

                case 6:
                    btn_click.Left = 187;
                    btn_click.Top = 450;
                    break;

                default:
                    break;
            }
        }

.