## .NET6 WEBAPI搭建步骤


1. 安装相关NuGet包

```
Install-Package Microsoft.EntityFrameworkCore

Install-Package MySql.EntityFrameworkCore //如果是mysql
Install-Package Microsoft.EntityFrameworkCore.SqlServer  //如果是mssql

```

2. 创建上下文链接类

```
using AntVue3Demo.Models;
using Microsoft.EntityFrameworkCore;

public class DbEntitys : DbContext
{
    /// <summary>
    /// 配置连接字符串，每次访问数据库之前会自动执行此方法，在这里配置连接字符串
    /// 相当于连接前事件
    /// 使用 IOC 注入的方式不实现此方法
    /// </summary>
    /// <param name="builder"></param>
    protected override void OnConfiguring(DbContextOptionsBuilder builder)
    {
        // 连接字符串
        string ConnString = "Server=101.33.219.205;Database=AntVue3DemoDB;User ID=sa;Password=memeda999;";

        // 连接SqlServer
        builder.UseSqlServer(ConnString);

        // 连接MySql
        //builder.UseMySql(ConnString);
    }

    /// <summary>
    /// 默认构造函数 使用方法与原来一样
    /// </summary>
    public DbEntitys() : base() { }

    /// <summary>
    /// 通过IOC
    /// </summary>
    /// <param name="options"></param>
    public DbEntitys(DbContextOptions<DbEntitys> options) : base(options)
    { }


    #region 表映射
    public virtual DbSet<Tabs> Tab1 { get; set; }
    #endregion

}

```

3.根据模型映射建库(CodeFist生成库)

```
Install-Package Microsoft.EntityFrameworkCore.Tools
Add-Migration InitialCreate(名称可自定义)
Update-Database

```

或手动创建Model映射表类，并体现在上下文链接类中

4.Program.cs文件的跨域配置

```
var builder = WebApplication.CreateBuilder(args);

// Add services to the container.

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
//跨域配置
builder.Services.AddCors(options =>
{
    options.AddPolicy
        (name: "kuayu",
            builde =>
            {
                builde.WithOrigins("*", "*", "*")
                .AllowAnyOrigin()
                .AllowAnyHeader()
                .AllowAnyMethod();
            }
        );
});
var app = builder.Build();

// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
    app.UseSwagger();
    app.UseSwaggerUI();
}

app.UseAuthorization();
app.UseCors("kuayu");
app.MapControllers();

app.Run();


```

5.在需要跨域的控制器文件中加入

```
[EnableCors("kuayu")]
[Route("api/[controller]")]

```

.NET6 WEBAPI搭建步骤

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