[英]Data lost after POST ASP.NET MVC 4
我一直在解決表單提交問題,遇到了我不知道的問題。 我知道這個問題已經發布了很多次,但是我似乎無法解決。
模型:
public class IndexModel
{
public string techNo { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }
}
控制器:
public ActionResult Index(IndexModel _oTechModel)
{
//some codes on pulling data from the database
return View("Index", _oTechModel);
}
[HttpPost]
public ActionResult ProcessTechnician(FormCollection form, string SubmitButton)
{
IndexModel _oTechModel = new IndexModel();
switch (SubmitButton)
{
case "save": //add new technician
{
}
break;
case "update": //update technician details
{
try
{
if (isValid(form["techNo"].ToUpper(), "technician") == false) { /*do nothing*/}
else
{
_GTechnician.TECHNICIAN_NO = form["techNo"].ToUpper();
_GTechnician.FIRSTNAME = form["lastName"].ToUpper(); //form is empty here
_GTechnician.LASTNAME = form["firstName"].ToUpper(); //form is empty here
_GTechnicianFacade.updateTechnician(_GTechnician, _GAppSetting.ConnectionString);
}
}
catch (Exception ex) { throw ex; }
}
break;
case "search": //search technician
{
try
{
if (isValid(form["techNo"].ToUpper(), "technician") == false) { /*do nothing*/}
else
{
//some codes here
_oTechModel.techNo = form["techNo"].ToUpper();
_oTechModel.firstName = fNameStr;
_oTechModel.lastName = lNameStr;
_oTechModel.setEnable = true;
}
}
catch (Exception ex) { throw ex; }
}
break;
case "delete":
{
}
break;
}
return RedirectToAction("Index", _oTechModel);
}
視圖:
@model Maintenance_.Models.IndexModel
@using (Html.BeginForm("ProcessTechnician", "Home", FormMethod.Post))
{
<td>Technician No :</td>
@Html.TextBoxFor(m => m.techNo)
<button type="submit" name="SubmitButton" value="search"></button>
<td>First Name :</td>
@Html.TextBoxFor(m => m.firstName, new { @class = "form-control", style = "width:380px;" })
<td>Last Name :</td>
@Html.TextBoxFor(m => m.lastName, new { @class = "form-control", style = "width:380px;" })
<button name="SubmitButton" value="delete" type="submit">Delete</button>
<button name="SubmitButton" value="update" type="submit">Update</button>
<button name="SubmitButton" value="save" type="submit">Save</button>
}
當我點擊搜索按鈕時,它將提交表單並在文本框中顯示技術人員的名字和姓氏,但是當我在點擊更新按鈕后立即更改文本框的值時,它將清除文本框,並且數據丟失。 我究竟做錯了什么?
post方法的第一行是
IndexModel _oTechModel = new IndexModel();
然后,您使用此“空”模型重定向到索引頁面。 (在Update語句的情況下,您沒有為_otechModel
分配任何值)
您需要改變幾件事。 第一次更改參數
FormCollection form
至
IndexModel _oTechModel
因為您已經從表單傳遞了IndexModel,所以它將自動綁定到參數_oTechModel。 接下來刪除該行。
IndexModel _oTechModel = new IndexModel();
然后改變
RedirectToAction("Index", _oTechModel);
它應該是。 查看文檔
RedirectToAction("Index", new {_oTechModel= _oTechModel});
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