如何将idt添加到堆栈顶部并使其不可为空 [英] How do I add the idt to the top of the stack and make it non nullable

问题描述

我想首先在List< Table1>中添加一行然后在更新mdf数据库的同时显示结果。我收到此错误代码：

I am trying to first Add a row to "List<Table1>" then display the results at the same time updating the mdf database. I get this error code:

The parameters dictionary contains a null entry for parameter 'Idt' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult EditAction(Int32, System.String, System.String, System.String)' in 'EditTables.Controllers.HomeController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters

Idt定义为Identity（1,1），如果无效则无关紧要。如何将idt添加到堆栈顶部并使其不可为空？

Idt is defined as "Identity(1,1)" and should not matter if nulled. How do I add the idt to the top of the stack and make it non nullable?

public class HomeController : Controller
    {
        private testContext db = new testContext();
        List<Table1> thistable = new List<Table1>
        [HttpPost]
        public ActionResult AddAction()
        {
            thistable = db.Data1.ToList();
            if (thistable != null)
            {
                thistable.Add(new Table1 { datetime0 = DateTime.Now.ToString(), col1 = Request.Form["c1"].ToString(), col2 = Request.Form["c2"].ToString(), col3 = Request.Form["c3"].ToString() });
                db.Data1.Add(new Table1 { datetime0 = DateTime.Now.ToString(), col1 = Request.Form["c1"].ToString(), col2 = Request.Form["c2"].ToString(), col3 = Request.Form["c3"].ToString() });
                db.SaveChanges();
                return View(thistable);
            }
            else
            {
                return null;
            }
        }

推荐答案

您的示例的第三行中有错误。

You have an error in the third row of your example.

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