如何在 Asp.net MVC4 中避免回发

将return RedirectToAction("ReceiptMaster", "Admin");更改为

return View(model);

在您的帖子操作中

如果你使用了重定向到操作，那么它加载了HTTP GET方法。所以你的验证消息消失了.

只需复制然后粘贴我的以下代码而不是您的发布操作代码

并删除此行：Receipt Receipt = new Models.Receipt();并调用模型而不是收据

//TO Insert
[HttpPost]
        public ActionResult ReceiptMaster(Receipt model, string command)
        {

            if (command == "Sumbit")
            {
                int Id = 0;
                if (model.Pay_Mode == "C")
                {
                    model.ChequeNo = "";
                    model.Cheque_Date = ("1/1/1753 12:00:00 AM");
                    model.Bank_Name = "";
                    model.Bank_Address = "";
                }
                if (ModelState.IsValid)
                {
                    Id = Receipt.SaveReceipt(model.Id, model.Cust_Id, model.Pay_Amount, model.Pay_Mode, model.Bank_Name, model.Bank_Address, model.ChequeNo, model.Cheque_Date);
                    if (Id > 0)
                    {
                        ViewData["Success"] = "Product was saved successfully.";
                        ViewData["ControlView"] = 1;
                          ObservableCollection<Receipt> ReceiptList = new              ObservableCollection<Receipt>();
            ReceiptList = Receipt.GetReceiptList();
            return View(ReceiptList);
                    }
                    ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
            ReceiptList = Receipt.GetReceiptList();
            return View(ReceiptList);
                }
                ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
                ReceiptList = Receipt.GetReceiptList();
                return View(ReceiptList);
            }
            ObservableCollection<Receipt> ReceiptList1 = new ObservableCollection<Receipt>();
            ReceiptList1 = Receipt.GetReceiptList();
            return View(ReceiptList1);
        }

编辑

请为ReceiptList添加一个模型属性，并在 post 方法内部分配此属性中的值，现在仅返回模型(现在此 ReceiptList 值存储在新ReceiptList属性中(，但您只返回您的 gridview 属性进行查看。但是验证消息和之前的值都存储在模型属性中，因此您需要在模型中添加一个用于ReceiptList的属性，并在此属性中读取和写入网格视图数据。

现在您将尝试我的以下代码(必须查看我的评论，想象一下模型。收据列表是我们在您的模型中添加新属性(

//TO Insert
[HttpPost]
        public ActionResult ReceiptMaster(Receipt model, string command)
        {

            if (command == "Sumbit")
            {
                int Id = 0;
                if (model.Pay_Mode == "C")
                {
                    model.ChequeNo = "";
                    model.Cheque_Date = ("1/1/1753 12:00:00 AM");
                    model.Bank_Name = "";
                    model.Bank_Address = "";
                }
                if (ModelState.IsValid)
                {
                    Id = Receipt.SaveReceipt(model.Id, model.Cust_Id, model.Pay_Amount, model.Pay_Mode, model.Bank_Name, model.Bank_Address, model.ChequeNo, model.Cheque_Date);
                    if (Id > 0)
                    {
                        ViewData["Success"] = "Product was saved successfully.";
                        ViewData["ControlView"] = 1;
                          ObservableCollection<Receipt> ReceiptList = new              ObservableCollection<Receipt>();
             model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
            return View(model);
                    }
                    ObservableCollection<Receipt> ReceiptList = new              ObservableCollection<Receipt>();
             model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
            return View(model);
                }
                ObservableCollection<Receipt> ReceiptList = new ObservableCollection<Receipt>();
                ReceiptList = Receipt.GetReceiptList();
                return View(ReceiptList);
            }
             ObservableCollection<Receipt> ReceiptList = new              ObservableCollection<Receipt>();
             model.ReceiptList = Receipt.GetReceiptList();// model.ReceiptList is your model property
            return View(model);
        }

在模型类中添加属性，例如

ObservableCollection<Receipt> ReceiptList  {get :set;}

我不是 100% 确定您在问什么，但听起来您需要在 RequiredIf 属性上启用客户端验证。

下面的代码阻止 %100 回发，请尝试。

您需要使用 Json 以防止页面中的完整回发。之后，您必须返回到"部分视图"。

例如;

网页代码：

<input type="text" id="UserName" name="UserName"/>
<input type="button" onclick="ButonClick()" value="Enter"/>

Javascript 代码：

function ButonClick() {
var data= {
UserName: $('#UserName').val(),
};
$.ajax({
url: "/Home/MyActionResult",
type: "POST",
dataType: "json",
contentType: 'application/json',
data: JSON.stringify(data),

控制器：

public ActionResult MyActionResult(string UserName,MyModel model)
{
var stringView = RenderRazorViewToString("_YourPartialView", model);
return Json(stringView, JsonRequestBehavior.AllowGet);
}

注意：

您需要以下代码来呈现 json 的部分视图。

下面也添加到您的控制器中。

public string RenderRazorViewToString(string viewName, object model)
{
ViewData.Model = model;
using (var sw = new StringWriter())
{
var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData,    TempData, sw);
viewResult.View.Render(viewContext, sw);
viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
return sw.GetStringBuilder().ToString();
}
}