removed migration ,altered Guid to int

Pages/Submissions/Create.cshtml.cs

@@ -37,7 +37,7 @@ namespace _2021_backend.Pages.Submissions
             {
                 stu = Student.create(Submission);
                 stu.Status = status.刚报名;
-                var q2 = from e in Context.Sessions select e.Guid;
+                var q2 = from e in Context.Sessions select e.Id;
                 var lst = q2.ToList();
                 stu.Timelist = lst;
                 Context.Students.Add(stu);
@@ -47,7 +47,7 @@ namespace _2021_backend.Pages.Submissions
                 stu = q.FirstOrDefault();
                 stu.Update(Submission);
             }
-            Submission.Host = stu.Guid;
+            Submission.Host = stu.Id;
             Context.Submissions.Add(Submission);
             Context.SaveChanges();
 

Pages/Submissions/Delete.cshtml

@@ -69,8 +69,8 @@
     </dl>
     
     <form method="post">
-        <input type="hidden" asp-for="Submission.Guid" />
-        <input type="submit" value="删除" class="btn btn-danger" asp-route-id="@Model.Submission.Guid.ToString()"/> |
+        <input type="hidden" asp-for="Submission.Id" />
+        <input type="submit" value="删除" class="btn btn-danger" asp-route-id="@Model.Submission.Id.ToString()"/> |
         <a asp-page="./Index">返回列表</a>
     </form>
 </div>

Pages/Submissions/Delete.cshtml.cs

@@ -24,12 +24,12 @@ namespace _2021_backend.Pages.Submissions
 
         public async Task<IActionResult> OnGetAsync(string? strid)
         {
-            Guid id = Guid.Parse(strid);
+            int id = int.Parse(strid);
             if (id == null)
             {
                 return NotFound();
             }
-            Submission = Context.Submissions.FirstOrDefault(m => m.Guid == id);
+            Submission = Context.Submissions.FirstOrDefault(m => m.Id == id);
             
             if (Submission == null)
             {
@@ -38,7 +38,7 @@ namespace _2021_backend.Pages.Submissions
             return Page();
         }
 
-        public async Task<IActionResult> OnPostAsync(Guid? id)
+        public async Task<IActionResult> OnPostAsync(int? id)
         {
             if (id == null)
             {
@@ -51,7 +51,7 @@ namespace _2021_backend.Pages.Submissions
                 var stu = Context.Students.Find(Submission.Host);
                 if (stu != null)
                 {
-                    stu.Submissions.Remove(Submission.Guid);
+                    stu.Submissions.Remove(Submission.Id);
                 }   
                 Context.Submissions.Remove(Submission);
                 Context.SaveChanges();

Pages/Submissions/Details.cshtml

@@ -74,6 +74,6 @@
     </dl>
 </div>
 <div>
-    <a asp-page="./Edit" asp-route-id="@Model.Submission.Guid">Edit</a> |
+    <a asp-page="./Edit" asp-route-id="@Model.Submission.Id">Edit</a> |
     <a asp-page="./Index">返回列表</a>
 </div>

Pages/Submissions/Details.cshtml.cs

@@ -28,8 +28,8 @@ namespace _2021_backend.Pages.Submissions
             {
                 return NotFound();
             }
-            Guid id = Guid.Parse(strid);
-            Submission = await _context.Submissions.FirstOrDefaultAsync(m => m.Guid == id);
+            int id = int.Parse(strid);
+            Submission = await _context.Submissions.FirstOrDefaultAsync(m => m.Id == id);
 
             if (Submission == null)
             {

Pages/Submissions/Edit.cshtml

@@ -13,7 +13,7 @@
     <div class="col-md-4">
         <form method="post">
             <div asp-validation-summary="ModelOnly" class="text-danger"></div>
-            <input type="hidden" asp-for="Submission.Guid" />
+            <input type="hidden" asp-for="Submission.Id" />
             <div class="form-group">
                 <label asp-for="Submission.Name" class="control-label"></label>
                 <input asp-for="Submission.Name" class="form-control" />

Pages/Submissions/Edit.cshtml.cs

@@ -25,13 +25,13 @@ namespace _2021_backend.Pages.Submissions
 
         public async Task<IActionResult> OnGetAsync(string? strid)
         {
-            Guid id = Guid.Parse(strid);
+            int id = int.Parse(strid);
             if (id == null)
             {
                 return NotFound();
             }
 
-            Submission = await Context.Submissions.FirstOrDefaultAsync(m => m.Guid == id);
+            Submission = await Context.Submissions.FirstOrDefaultAsync(m => m.Id == id);
 
             if (Submission == null)
             {
@@ -57,7 +57,7 @@ namespace _2021_backend.Pages.Submissions
             }
             catch (DbUpdateConcurrencyException)
             {
-                if (!SubmissionExists(Submission.Guid))
+                if (!SubmissionExists(Submission.Id))
                 {
                     return NotFound();
                 }
@@ -70,9 +70,9 @@ namespace _2021_backend.Pages.Submissions
             return RedirectToPage("./Index");
         }
 
-        private bool SubmissionExists(Guid id)
+        private bool SubmissionExists(int id)
         {
-            return Context.Submissions.Any(e => e.Guid == id);
+            return Context.Submissions.Any(e => e.Id == id);
         }
     }
 }

Pages/Submissions/Index.cshtml

@@ -75,9 +75,9 @@
                     @Html.DisplayFor(modelItem => item.SubmitTime)
                 </td>
                 <td>
-                    <a asp-page="./Edit" asp-route-strid="@item.Guid.ToString()">编辑</a> |
-                    <a asp-page="./Details" asp-route-strid="@item.Guid.ToString()">详细信息</a> |
-                    <a asp-page="./Delete" asp-route-strid="@item.Guid.ToString()">删除</a>
+                    <a asp-page="./Edit" asp-route-strid="@item.Id.ToString()">编辑</a> |
+                    <a asp-page="./Details" asp-route-strid="@item.Id.ToString()">详细信息</a> |
+                    <a asp-page="./Delete" asp-route-strid="@item.Id.ToString()">删除</a>
                 </td>
             </tr>
         }