发送数据后将其保留为表格

Question

I have a form that you enter data into and it performs a calculation on it and give an answer. what i want to do is for it to keep the data in the form so that you can quickly repost so that you don't have to change all the data. but I cant keep coming up with the error of it not existing, which I suppose is correct until the form has been posted!

@{
  var total = 0m;
  var totalMessage = "";


    if (IsPost)
    {
        var age = Request["frmage"].AsInt(0);
        var weight = Request["frmweight"].AsDecimal();
        var SerCre = Request["frmSerCre"].AsDecimal();
        var sexfactor = Request["frmGender"]== "M" ? 1.23m : 1.04m;

        total =Convert.ToDecimal ((((140 - age)*weight)* sexfactor )/SerCre ) ;

        totalMessage =  total.ToString("0.00") + "(ml/min) ";
    }


}
<div class="memberRegistration">
<form method="post">

<p>
    <label class="formLabel">Age:</label> in years
    <input class="formTextField" type="text" name="frmAge" size="3" value="@age"/>
</p>
<p>
    <label class="formLabel">Weight:</label> in Kg (1st = 6.35kg)
    <input class="formTextField" type="text" name="frmWeight" value="@weight"/>
</p>
<p>
    <label class="formLabel">Serum Creatinine:</label> in μmol/L
    <input class="formTextField" type="text" name="frmSerCre" value="@SerCre"/>

</p>
<p>

<label class="fieldLabel">Gender:</label>
    <select name="frmGender" id="select" value="@sexfactor">
        <option value="M">Male</option>
        <option value="F">Female</option>
    </select>

</p>
<p><input type="submit" value="Calculate" /></p>
</form>
<p>Calculated creatinine clearance <b>@totalMessage</b></p>
</div>

Answer 1

Try this

var age = 0;

    if (IsPost)
    {
        age = Request["frmage"].AsInt(0);

    }

<input class="formTextField" type="text" name="frmAge" size="3" value="@age"/>

---

But normally it would be better to use a model to hold your values, then in your controller you pass those values back again to your form

Answer 2

启用页面和控件的ViewState，还使用aspx控件，而不是HTML。

Answer 3

I don't thing that i realy understand the Question because the default thing is that the web page keeps it's view state so the data will still be the same after the post back but here's the solution :

you can simply use ASP Controls because it keep it's view state or you can give each control of them it's value in the C# , you can assign to each control it's value back

Hope I Helped

Answer 4

Since you are using ASP.NET MVC Razor, what you can do is, do not submit the form using <input type="submit" value="Calculate" /> , instead change it to a simple button like

      <input type="button" value="Calculate" onclick="javascript:Submitform();" />

and submit the form using Jquery POST.eg like below

   function SubmitForm(){
      var formData = $("form").serialize() ;
      var submitUrl = 'yourURL' ;
      $.ajax({
           type : 'POST' , 
           url : submitUrl , 
           data : formData , 
           success : function (data ){ alert ("Request successful") ;}
           error : function (jqXHR, status , errorthrown) { alert ("error Occured");}
        });

   }