重複記錄創建每次表單提交MVC 4 C＃

工作MVC 4和Entity Framework，面對後svind新紀錄我通過ID查看模型一個棘手的問題，但它的其餘相同;（：重複記錄創建每次表單提交MVC 4 C＃

public ActionResult Edit(SubscriptionViewModel oSubModel) { 
    if (ModelState.IsValid) { 
     Subscription oSubDetail = new Subscription(); 
     oSubDetail.Title = oSubModel.Title; 
     oSubDetail = this.subRep.SaveSubscription(oSubDetail); 
     if (oSubDetail == null) { 
      ModelState.AddModelError("error", "Error in saving the data,please try after some time."); 
     } else { 
      oSubModel.Id = oSubDetail.Id; //Id return to view 
      ModelState.AddModelError("success", "User saved"); 
     } 
    } 
    } 
    return View(oSubModel); //Model return to view 
    // Note: id that I've passed display here correct but in view its still 0 
} 


@using (Html.BeginForm()) { 
    <div class="row"> 
     @Html.ValidationSummary(true, "", new { @class = "text-danger" }) 
     @Html.HiddenFor(model => model.Id) 
     <div class="col-md-6"> 
      <div class="form-group"> 
       @Html.LabelFor(model => model.Title, htmlAttributes: new { @class = "control-label " }) 
       @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } }) 
       @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" }) 
      </div> 
     </div> 
     <div class="col-md-12"> 
      <div class="form-group"> 
       <input type="submit" value="Save" class="btn btn-primary" /> 
       <a href="@Url.Action(" Subscription ", "Subscription ")" class="btn btn-default"> 
         Back to Subscriptions 
       </a> 
      </div> 
     </div> 
    </div> 
}

注意：在我已通過的控制器ID顯示正確但在視圖中仍然0

來源

2017-06-23 Govind Samrow

那他們存在（在你的情況下，他們這樣做）。行爲解釋在[這個答案]（https://stackoverflow.com/questions/26654862/textboxfor-displaying-initial-value-not-the-value-updated-from-code/26664111#26664111）。但是一旦數據被保存，你就不應該返回視圖。你應該重定向（PRG模式） –

ID不會更改，因爲MVC在ModelState中查找最初提供給視圖的值爲了防止此問題，則需要刪除ModelState中的值：

oSubModel.Id = oSubDetail.Id; //Id return to view 
ModelState.Remove("Id");

現在解決了問題，當您第一次保存記錄時，您將返回ID。但是，當您再次提交時，您不使用該ID，因此它會創建另一個記錄。假設你SaveSubscription功能檢測到ID的存在和更新記錄而不是插入一個新的，你需要通過它的ID：因爲`HtmlHelper`方法使用的值來回`ModelState`如果

Subscription oSubDetail = new Subscription(); 
oSubDetail.Title = oSubModel.Title; 
oSubDetail.Id = oSubModel.Id; 
oSubDetail = this.subRep.SaveSubscription(oSubDetail);

來源

2017-06-23 07:33:05

重複記錄創建每次表單提交MVC 4 C＃

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