如何在 MVC 中单击按钮时移至其他操作方法

Question

我制作了一个表单，用户可以在其中输入所有详细信息。就像填表一样。填完表格后。当用户单击保存按钮时，它应该自动移动到同一控制器中的其他操作方法。并且必须在 MVC 的 GRID VIEW 中显示数据。在网格视图中，用户可以在填写表格时更新和保存他输入的所有数据。 我使用了 DB 优先方法。并制作一个视图模型类。这是View Model类的代码。

public class ViewModel
{
    [Required(ErrorMessage = "Please Enter Prodcut Name")]
    [DisplayName("Product Name")]
    public string Product_Name { get; set; }
    [Required(ErrorMessage = "Please Choose Category")]
    public int SelectedValue { get; set; }
    [Required(ErrorMessage = "Enter Price")]
    [DisplayName("Enter Price")]
    public decimal Price { get; set; }
    [Required(ErrorMessage = "Choose Picture")]
    [DisplayName("Choose Picture")]
    public string Picture { get; set; }
    [Required(ErrorMessage = "Choos Country")]
    public Nullable<int> Country_ID { get; set; }
    [Required(ErrorMessage = "Choose Type")]
    [DisplayName("Choose Product Type")]
    public string Product_Type { get; set; }
    public SelectList CategoryList { get; set; }
    public SelectList CountryList { get; set; }
    [Required(ErrorMessage = "Select Date")]
    public DateTime Date { get; set; }
}

控制器代码

ProductionEntities DBContext = new ProductionEntities(); 

public ActionResult Index()
{
    ViewModel model = new ViewModel();

    List<tblCategory> CategoryList = DBContext.tblCategories.ToList();
    model.CategoryList = new SelectList(CategoryList, "Category_ID", "Category_Name");

    List<tblCountry> CountryList = DBContext.tblCountries.ToList();
    model.CountryList = new SelectList(CountryList, "Country_ID", "Country_Name");
    return View(model);
}

[HttpPost]
public ActionResult Index(ViewModel model)
{
    //ViewModel v = new ViewModel();
    //if (image1!=null)
    //{
    //    model.Picture = new byte[image1.ContentLength];
    //    image1.InputStream.Read(model.Picture, 0, image1.ContentLength);
    //}

    List<tblCategory> CategoryList = DBContext.tblCategories.ToList();
    model.CategoryList = new SelectList(CategoryList, "Category_ID", "Category_Name");
    List<tblCountry> CountryList = DBContext.tblCountries.ToList();
    model.CountryList = new SelectList(CountryList, "Country_ID", "Country_Name");
    if (!ModelState.IsValid)
    {
        tblProduct product = new tblProduct();
        product.Category_ID = model.SelectedValue;
        product.Country_ID = model.Country_ID;
        product.Price = model.Price;
        product.Product_Name = model.Product_Name;
        product.Date = model.Date;
        product.Picture = model.Picture;
        product.Product_Type = model.Product_Type;
        try
        {
            DBContext.tblProducts.Add(product);
            DBContext.SaveChanges();
        }
        catch  (DbEntityValidationException dbEx)
        {
            foreach (var validationErrors in dbEx.EntityValidationErrors)
            {
                foreach (var validationError in validationErrors.ValidationErrors)
                {
                    System.Console.WriteLine("Property: {0} Error: {1}", validationError.PropertyName, validationError.ErrorMessage);
                }
            }
        }
    }
    return View(model);
}

Answer 1

您应该遵循 P-R-G (Post-Redirect-Get) 模式。成功保存记录后，向浏览器发送重定向响应，浏览器将向呈现表格数据的操作方法发出全新的 GET 请求。

DBContext.tblProducts.Add(product);
DBContext.SaveChanges();
return RedirectToAction("List");

在您的 List 操作方法中，您将读取表格数据所需的记录并将其呈现在其视图中。