【解決方法】これは私が作成した ASP.NET アプリケーションです。 しかし、このプロジェクトをデータベースに接続できません

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これをデータベースに接続する方法がわかりません。 このプロジェクトを mvc に変換したい場合、その方法を教えてください。 私は Asp.net を初めて使用するので、これを学びたいと思っています。 助けてください。 asp.net に適したフロントエンド言語は何ですか。または通常、以下のように 1 つのプロジェクトですべてのフロントエンドとバックエンドを使用します。 ありがとう

私が試したこと：

default.aspx.cs

<pre>using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace WebApplication4
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                UpdateCounts();
            }
        }

        protected void btnPass_Click(object sender, EventArgs e)
        {
            InsertInspection("Pass", null);
            UpdateCounts();
        }

        protected void btnFail_Click(object sender, EventArgs e)
        {
            lblFailReason.Visible = true;
            ddlFailReason.Visible = true;
            btnFailSubmit.Enabled = false; // Disable the Submit button initially
        }

        protected void ddlFailReason_SelectedIndexChanged(object sender, EventArgs e)
        {
            btnFailSubmit.Enabled = !string.IsNullOrEmpty(ddlFailReason.SelectedValue);
        }

        protected void btnFailSubmit_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(ddlFailReason.SelectedValue))
            {
                InsertInspection("Fail", ddlFailReason.SelectedValue);
                UpdateCounts();
                HideFailControls();
            }
        }

        private void InsertInspection(string decision, string failReason)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                using (SqlCommand command = new SqlCommand("InsertMaterialInspection", connection))
                {
                    command.CommandType = CommandType.StoredProcedure;
                    command.Parameters.AddWithValue("@Decision", decision);

                    if (decision == "Pass")
                    {
                        command.Parameters.AddWithValue("@FailReason", DBNull.Value);
                    }
                    else
                    {
                        command.Parameters.AddWithValue("@FailReason", failReason);
                    }

                    command.ExecuteNonQuery();
                }
            }
        }

        private void UpdateCounts()
        {
            string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                using (SqlCommand command = new SqlCommand("GetInspectionCounts", connection))
                {
                    command.CommandType = CommandType.StoredProcedure;

                    using (SqlDataReader reader = command.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            int totalCount = Convert.ToInt32(reader["TotalCount"]);
                            int passCount = Convert.ToInt32(reader["PassCount"]);
                            int failCount = Convert.ToInt32(reader["FailCount"]);

                            lblTotalCount.Text = $"Total Count: {totalCount}";
                            lblPassCount.Text = $"Pass Count: {passCount}";
                            lblFailCount.Text = $"Fail Count: {failCount}";
                        }
                    }
                }
            }
        }




        private void HideFailControls()
        {
            ddlFailReason.SelectedIndex = 0; // Reset dropdown to default
            ddlFailReason.Visible = false;
            lblFailReason.Visible = false;
            btnFailSubmit.Enabled = false; // Disable the Submit button after submitting
        }
    }
}

デフォルト.aspx

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication4._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">

    <div class="jumbotron">
        <h1>Material Inspection System</h1>
        <p class="lead">Inspect materials and record pass/fail decisions.</p>
    </div>

    <div class="row">
        <div class="col-md-4">
            <h2>Pass</h2>
            <asp:Button ID="btnPass" runat="server" Text="Pass" OnClick="btnPass_Click" CssClass="btn btn-success" />
        </div>
        <div class="col-md-4">
            <h2>Fail</h2>
            <asp:Button ID="btnFail" runat="server" Text="Fail" OnClick="btnFail_Click" CssClass="btn btn-danger" />
            <br />
            <asp:Label ID="lblFailReason" runat="server" Text="Reason for Failure:" Visible="false"></asp:Label>
            <asp:DropDownList ID="ddlFailReason" runat="server" Visible="false" AutoPostBack="true" OnSelectedIndexChanged="ddlFailReason_SelectedIndexChanged">
                <asp:ListItem Text="Select Reason" Value="" />
                <asp:ListItem Text="Defect" Value="Defect" />
                <asp:ListItem Text="Incorrect Specification" Value="Incorrect Specification" />
                <asp:ListItem Text="Damage" Value="Damage" />
            </asp:DropDownList>
            <br />
            <asp:Button ID="btnFailSubmit" runat="server" Text="Submit" OnClick="btnFailSubmit_Click" CssClass="btn btn-danger" Enabled="false" />
        </div>
        <div class="col-md-4">
            <h2>Inspection Summary</h2>
            <div>
                <asp:Label ID="lblTotalCount" runat="server" Text="Total Count: 0"></asp:Label><br />
                <asp:Label ID="lblPassCount" runat="server" Text="Pass Count: 0"></asp:Label><br />
                <asp:Label ID="lblFailCount" runat="server" Text="Fail Count: 0"></asp:Label>
            </div>
        </div>
    </div>

</asp:Content>

ウェブコンフィグ 

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  https://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.7.2" />
    <httpRuntime targetFramework="4.7.2" />
    <pages>
      <namespaces>
        <add namespace="System.Web.Optimization" />
      </namespaces>
      <controls>
        <add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt" />
      </controls>
    </pages>
  </system.web>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" />
        <bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Web.Infrastructure" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-2.0.1.0" newVersion="2.0.1.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-12.0.0.0" newVersion="12.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+" />
    </compilers>
  </system.codedom>
</configuration>

ストア手順

CREATE TABLE MaterialInspections (
    InspectionID INT IDENTITY(1,1) PRIMARY KEY,
    Decision NVARCHAR(50),
    FailReason NVARCHAR(100)
);

CREATE PROCEDURE InsertMaterialInspection
    @Decision NVARCHAR(50),
    @FailReason NVARCHAR(100) = NULL
AS
BEGIN
    INSERT INTO MaterialInspections (Decision, FailReason)
    VALUES (@Decision, @FailReason);
END;

CREATE PROCEDURE GetInspectionCounts
AS
BEGIN
    SELECT
        (SELECT COUNT(*) FROM MaterialInspections) AS TotalCount,
        (SELECT COUNT(*) FROM MaterialInspections WHERE Decision = 'Pass') AS PassCount,
        (SELECT COUNT(*) FROM MaterialInspections WHERE Decision = 'Fail') AS FailCount
END

解決策 1

学習プロセスを開始するには、以下の記事を参照してください。 「メモ」セクションには、初心者の理解に非常に役立つ貴重なリンクがいくつか含まれています。
SQL Server と Entity Framework を使用した ASP.NET MVC アプリケーションの設計のための初心者ガイド[^]

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