From a71d7d9d49e54044e6532f544224130880894b9e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=A9=89=E5=A9=B7?= <2465898445@qq.com>
Date: Thu, 2 Jan 2025 21:59:13 +0800
Subject: [PATCH] tijiao

---
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 ...6\347\224\237\347\256\241\347\220\2062.md" |  99 ++++++
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 create mode 100644 "\347\216\213\345\251\211\345\251\267/20241225-\345\255\246\347\224\237\347\256\241\347\220\2062.md"
 create mode 100644 "\347\216\213\345\251\211\345\251\267/20241226-\347\256\241\347\220\206\347\263\273\347\273\237.md"
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diff --git "a/\347\216\213\345\251\211\345\251\267/20241223-\345\255\246\347\224\237\347\256\241\347\220\2061.md" "b/\347\216\213\345\251\211\345\251\267/20241223-\345\255\246\347\224\237\347\256\241\347\220\2061.md"
new file mode 100644
index 0000000..e2fefa4
--- /dev/null
+++ "b/\347\216\213\345\251\211\345\251\267/20241223-\345\255\246\347\224\237\347\256\241\347\220\2061.md"
@@ -0,0 +1,57 @@
+# 创建一个学生管理系统涉及到前端和后端的集成开发。
+## 1. 创建表
+```
+dotnet new webapi -n StudentManagementSystem
+cd StudentManagementSystem
+```
+## 2. 安装Entity Framework Core
+安装Entity Framework Core用于数据库操作：
+
+```
+dotnet add package Microsoft.EntityFrameworkCore.SqlServer
+dotnet add package Microsoft.EntityFrameworkCore.Design
+```
+## 3. 定义数据库模型
+在Models文件夹中创建一个Student.cs文件：
+
+csharp
+public class Student
+{
+    public int Id { get; set; }
+    public string Name { get; set; }
+    public int Age { get; set; }
+    public string Grade { get; set; }
+}
+## 4. 配置数据库上下文
+在Data文件夹中创建一个ApplicationDbContext.cs文件：
+
+```csharp
+using Microsoft.EntityFrameworkCore;
+
+public class ApplicationDbContext : DbContext
+{
+    public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
+        : base(options)
+    {
+    }
+
+    public DbSet<Student> Students { get; set; }
+}
+```
+5. 配置数据库连接字符串
+在appsettings.json文件中添加数据库连接字符串：
+```
+json
+{
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=StudentManagement;Trusted_Connection=True;MultipleActiveResultSets=true"
+  }
+}
+```
+6. 数据库迁移
+创建数据库迁移并更新数据库：
+
+```
+dotnet ef migrations add InitialCreate
+dotnet ef database update
+```
\ No newline at end of file
diff --git "a/\347\216\213\345\251\211\345\251\267/20241225-\345\255\246\347\224\237\347\256\241\347\220\2062.md" "b/\347\216\213\345\251\211\345\251\267/20241225-\345\255\246\347\224\237\347\256\241\347\220\2062.md"
new file mode 100644
index 0000000..d0103a8
--- /dev/null
+++ "b/\347\216\213\345\251\211\345\251\267/20241225-\345\255\246\347\224\237\347\256\241\347\220\2062.md"
@@ -0,0 +1,99 @@
+# 创建一个学生管理系统涉及到前端和后端的集成开发。
+
+## 7. 创建API控制器
+
+在`Controllers`文件夹中创建一个`StudentsController.cs`文件：
+
+```csharp
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+[Route("api/[controller]")]
+[ApiController]
+public class StudentsController : ControllerBase
+{
+    private readonly ApplicationDbContext _context;
+
+    public StudentsController(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    // GET: api/Students
+    [HttpGet]
+    public async Task<ActionResult<IEnumerable<Student>>> GetStudents()
+    {
+        return await _context.Students.ToListAsync();
+    }
+
+    // POST: api/Students
+    [HttpPost]
+    public async Task<ActionResult<Student>> PostStudent(Student student)
+    {
+        _context.Students.Add(student);
+        await _context.SaveChangesAsync();
+
+        return CreatedAtAction("GetStudent", new { id = student.Id }, student);
+    }
+}
+```
+
+## 8. 前端页面
+
+创建一个简单的HTML页面用于显示和添加学生信息：
+
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Student Management System</title>
+</head>
+<body>
+    <h1>Student Management System</h1>
+    <div>
+        <input type="text" id="name" placeholder="Name">
+        <input type="number" id="age" placeholder="Age">
+        <input type="text" id="grade" placeholder="Grade">
+        <button onclick="addStudent()">Add Student</button>
+    </div>
+    <ul id="studentsList"></ul>
+
+    <script>
+        async function addStudent() {
+            const name = document.getElementById('name').value;
+            const age = document.getElementById('age').value;
+            const grade = document.getElementById('grade').value;
+
+            const response = await fetch('api/Students', {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                },
+                body: JSON.stringify({ name, age, grade }),
+            });
+
+            const student = await response.json();
+            document.getElementById('studentsList').innerHTML += `<li>${student.name} - ${student.age} - ${student.grade}</li>`;
+        }
+
+        async function loadStudents() {
+            const response = await fetch('api/Students');
+            const students = await response.json();
+
+            document.getElementById('studentsList').innerHTML = '';
+            students.forEach(student => {
+                document.getElementById('studentsList').innerHTML += `<li>${student.name} - ${student.age} - ${student.grade}</li>`;
+            });
+        }
+
+        loadStudents();
+    </script>
+</body>
+</html>
+```
+
+
diff --git "a/\347\216\213\345\251\211\345\251\267/20241226-\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/\347\216\213\345\251\211\345\251\267/20241226-\347\256\241\347\220\206\347\263\273\347\273\237.md"
new file mode 100644
index 0000000..d792789
--- /dev/null
+++ "b/\347\216\213\345\251\211\345\251\267/20241226-\347\256\241\347\220\206\347\263\273\347\273\237.md"
@@ -0,0 +1,313 @@
+# 控制器
+## - CoursesController.cs
+```csharp
+using Microsoft.AspNetCore.Mvc;
+using ScoreManager.Models;
+
+namespace ScoreManager.Controllers;
+
+public class CoursesController : Controller
+{
+    private readonly ScoreDbContext _db;
+    public CoursesController()
+    {
+        _db = new ScoreDbContext();
+    }
+    public IActionResult Index(string keyword)
+    {
+        keyword = string.IsNullOrEmpty(keyword) ? "" : keyword.Trim();
+        if (string.IsNullOrEmpty(keyword))
+        {
+            var list = _db.Courses.ToList();
+            return View(list);
+        }
+        var res = _db.Courses.Where(x => x.CourseName.Contains(keyword)).ToList();
+        return View(res);
+
+    }
+    public IActionResult Edit(int id)
+    {
+        var obj = _db.Courses.FirstOrDefault(x => x.Id == id);
+        return View(obj);
+    }
+
+    [HttpPost]
+    public IActionResult Edit(Course input)
+    {
+        var obj = _db.Courses.FirstOrDefault(x => x.Id == input.Id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+        obj.CourseName = input.CourseName;
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+    public IActionResult Delete(int id)
+    {
+        var obj = _db.Courses.FirstOrDefault(x => x.Id == id);
+        return View(obj);
+    }
+    public IActionResult DeleteConfirm(int id)
+    {
+        var obj = _db.Courses.FirstOrDefault(x => x.Id == id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+        _db.Courses.Remove(obj);
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+    public IActionResult Create()
+    {
+        return View();
+    }
+
+    [HttpPost]
+    public IActionResult Create(Course input)
+    {
+        _db.Courses.Add(input);
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+}
+```
+
+## - ScoresController.cs
+```csharp
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Rendering;
+using ScoreManager.Models;
+
+namespace ScoreManager.Controllers;
+
+public class ScoresController : Controller
+{
+    private readonly ScoreDbContext _db;
+
+    public ScoresController()
+    {
+        _db = new ScoreDbContext();
+    }
+    public IActionResult Index(string keyword)
+    {
+        var list = _db.Scores.ToList();
+        var stus = _db.Students.Where(x => !x.IsDeleted).ToList();
+        var cours = _db.Courses.ToList();
+        var res = list.Select(x =>
+        {
+            var tmpStu = stus.FirstOrDefault(y => y.Id == x.StudentId);
+            var tmpCourse = cours.FirstOrDefault(z => z.Id == x.CourseId);
+            return new
+            {
+                x.Id,
+                x.StudentId,
+                StudentName = tmpStu == null ? "" : tmpStu.StudentName,
+                x.CourseId,
+                CourseName = tmpCourse == null ? "" : tmpCourse.CourseName,
+                x.Scores
+            };
+        });
+
+        if (string.IsNullOrEmpty(keyword))
+        {
+            return View(res);
+        }
+        ViewBag.Keyword=keyword;
+        var tmpList = res.Where(x => x.StudentName.Contains(keyword) || x.CourseName.Contains(keyword)
+        || x.Scores.ToString().Contains(keyword));
+        return View(tmpList);
+
+    }
+
+    public IActionResult Create()
+    {
+        var students = _db.Students.Where(x => !x.IsDeleted).ToList();
+        var course = _db.Courses.ToList();
+        ViewBag.Students = new SelectList(students, "Id", "StudentName");
+        ViewBag.Courses = new SelectList(course, "Id", "CourseName");
+        return View();
+    }
+    [HttpPost]
+    public IActionResult Create(Score input)
+    {
+        _db.Scores.Add(input);
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+    public IActionResult Edit(int id)
+    {
+        var obj = _db.Scores.FirstOrDefault(x => x.Id == id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+        var students = _db.Students.Where(x => !x.IsDeleted).ToList();
+        var course = _db.Courses.ToList();
+        ViewBag.Students = new SelectList(students, "Id", "StudentName");
+        ViewBag.Courses = new SelectList(course, "Id", "CourseName");
+        return View(obj);
+    }
+    [HttpPost]
+    public IActionResult Edit(Score input)
+    {
+        var obj = _db.Scores.FirstOrDefault(x => x.Id == input.Id);
+        if (obj != null)
+        {
+            obj.CourseId = input.CourseId;
+            obj.StudentId = input.StudentId;
+            obj.Scores = input.Scores;
+            _db.Scores.Update(obj);
+            _db.SaveChanges();
+            return RedirectToAction("Index");
+        }
+        return NotFound();
+    }
+    public IActionResult Delete(int id)
+    {
+        var tmp = _db.Scores.FirstOrDefault(x => x.Id == id);
+        if (tmp == null)
+        {
+            return NotFound();
+        }
+        // 使用非空的成绩记录，在课程表中查找对应id的课程信息(存在找不到的情况)
+        var tmpCourse = _db.Courses.FirstOrDefault(x => x.Id == tmp.CourseId);
+        var tmpStudent = _db.Students.FirstOrDefault(x => x.Id == tmp.StudentId);
+
+        // 处理有可能找不到的课程或者学生的情况
+        var cName = tmpCourse == null ? "" : tmpCourse.CourseName;
+        var sName = tmpStudent == null ? "" : tmpStudent.StudentName;
+
+        var obj = new { tmp.Id, tmp.CourseId, CourseName = cName, tmp.StudentId, StudentName = sName, Score = tmp.Scores };
+        return View(obj);
+    }
+
+    public IActionResult DeleteConfirm(int id)
+    {
+        var obj = _db.Scores.FirstOrDefault(x => x.Id == id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+
+        _db.Scores.Remove(obj);
+        _db.SaveChanges();
+
+        return RedirectToAction("Index");
+    }
+}
+```
+## - StudentsController.cs
+```csharp
+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;
+using ScoreManager.Models;
+
+namespace ScoreManager.Controllers;
+
+public class StudentsController : Controller
+{
+    private readonly ScoreDbContext _db;
+    public StudentsController()
+    {
+        _db = new ScoreDbContext();
+    }
+
+    public IActionResult Index(string keyword)
+    {
+        // 2种情况
+        // 有查找有关键字
+        // 没有查找，也没有关键字（关键字为空的情况）
+
+        // 第一种
+        // IEnumerable<Student> list;
+        // if (string.IsNullOrEmpty(keyword))
+        // {
+        //     list = _db.Students;
+        // }
+        // else
+        // {
+        //     list = _db.Students.Where(x => x.StudentCode.Contains(keyword) || x.StudentName.Contains(keyword));
+        // }
+        // return View(list);
+
+        // 第二种
+        // if(string.IsNullOrEmpty(keyword))
+        // {
+        //     return View(_db.Students);
+        // }else{
+        //     var list=_db.Students.Where(x=>x.StudentCode.Contains(keyword) || x.StudentName.Contains(keyword));
+        //     return View(list);
+        // }
+
+        // 第三种
+        var res = _db.Students.Where(x => !x.IsDeleted);
+        if (string.IsNullOrEmpty(keyword))
+        {
+            return View(res);
+        }
+        var list = res.Where(x => x.StudentCode.Contains(keyword) || x.StudentName.Contains(keyword));
+        return View(list);
+    }
+    [HttpGet]
+    public IActionResult Create()
+    {
+        return View();
+    }
+    [HttpPost]
+    public IActionResult Create(Student input)
+    {
+        _db.Students.Add(input);
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+    public IActionResult Edit(int id)
+    {
+        var entity = _db.Students.FirstOrDefault(x => x.Id == id);
+        if (entity != null)
+        {
+            return View(entity);
+        }
+        return NotFound();
+    }
+    [HttpPost]
+    public IActionResult Edit(Student input)
+    {
+        var entity = _db.Students.FirstOrDefault(x => x.Id == input.Id);
+        if (entity != null)
+        {
+            entity.StudentCode = input.StudentCode;
+            entity.StudentName = input.StudentName;
+            entity.Age = input.Age;
+            _db.Students.Update(entity);
+            _db.SaveChanges();
+            // _db.SaveChangesAsync();
+            return RedirectToAction("Index");
+        }
+        return NotFound();
+    }
+    public IActionResult Delete(int id)
+    {
+        var obj = _db.Students.FirstOrDefault(x => x.Id == id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+        return View(obj);
+    }
+    public IActionResult DeleteConfirm(int id)
+    {
+        var obj = _db.Students.FirstOrDefault(x => x.Id == id);
+        if (obj == null)
+        {
+            return NotFound();
+        }
+        obj.IsDeleted = true;
+        _db.Students.Update(obj);
+        _db.SaveChanges();
+        return RedirectToAction("Index");
+    }
+
+}
+```
\ No newline at end of file
diff --git "a/\347\216\213\345\251\211\345\251\267/20241230-\351\241\265\351\235\242\346\223\215\344\275\234.md" "b/\347\216\213\345\251\211\345\251\267/20241230-\351\241\265\351\235\242\346\223\215\344\275\234.md"
new file mode 100644
index 0000000..67b4c44
--- /dev/null
+++ "b/\347\216\213\345\251\211\345\251\267/20241230-\351\241\265\351\235\242\346\223\215\344\275\234.md"
@@ -0,0 +1,68 @@
+ ## - student index.cshtml
+ ```csharp
+ @model IEnumerable<Student>;
+
+
+<div>
+    <form asp-action="Index" method="get">
+        <label for=""><input type="text" name="keyword"></label>
+        <input type="submit" value="查找">
+    </form>
+    <a asp-action="Create">新增</a>
+</div>
+<table>
+    <thead>
+        <tr>
+            <th>Id</th>
+            <th>学号</th>
+            <th>学生姓名</th>
+            <th>年龄</th>
+            <th>操作</th>
+        </tr>
+    </thead>
+    <tbody>
+        @foreach (var item in Model)
+        {
+            <tr>
+                <td>@item.Id</td>
+                <td>@item.StudentCode</td>
+                <td>@item.StudentName</td>
+                <td>@item.Age</td>
+                <td>
+                    <a asp-action="Edit" asp-route-id="@item.Id">编辑</a>
+                    <a asp-action="Delete" asp-route-id="@item.Id">删除</a>
+                </td>
+            </tr>
+        }
+
+    </tbody>
+</table>
+```
+
+## create.cshtml
+```csharp
+@model Student;
+
+<form asp-action="Create" method="post">
+    <table>
+        <tr>
+            <td><label for="">学号：</label></td>
+            <td><input asp-for="StudentCode"></td>
+        </tr>
+        <tr>
+            <td><label for="">学生姓名：</label></td>
+            <td><input asp-for="StudentName"></td>
+        </tr>
+        <tr>
+            <td><label for="">年龄：</label></td>
+            <td><input asp-for="Age"></td>
+        </tr>
+        <tr>
+            <td><input type="submit"></td>
+            <td> <a asp-action="Index">取消</a></td>
+        </tr>
+    </table>
+
+
+</form>
+```
\ No newline at end of file
-- 
Gitee