如果数据库不存在，自动创建数据库

src/StaffManagement/Database/DbInit.cs

@@ -1,32 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.CompilerServices;
-using System.Threading.Tasks;
-using Microsoft.AspNetCore.Builder;
-using Microsoft.Extensions.DependencyInjection;
-
-namespace StaffManagement.Database
-{
-    static public class DbInit
-    {
-        /// <summary>
-        /// 初始化数据库
-        /// </summary>
-        /// <param name="app"></param>
-        /// <returns></returns>
-        public static IApplicationBuilder SMDbInit(this IApplicationBuilder app) {
-            app.ApplicationServices.GetService<SMDbContext>().Init();
-            return app;
-        }
-        /// <summary>
-        /// 初始化数据库
-        /// </summary>
-        /// <param name="db">数据库上下文</param>
-        /// <returns></returns>
-        public static SMDbContext Init(this SMDbContext db) {
-            db.Database.EnsureCreated();
-            return db;
-        }
-    }
-}

src/StaffManagement/Startup.cs

@@ -66,7 +66,7 @@ namespace StaffManagement
                 app.UseExceptionHandler("/Home/Error");
             }
             app.UseStaticFiles();
-            db.Init();
+            db.Database.EnsureCreated();
             app.UseSwagger();
             app.UseSwaggerUI(c => {
                 c.SwaggerEndpoint("/swagger/V1/swagger.json","接口文档");