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我是 MVC 的新手，很困惑。正在使用具有不同显示页面的两个主要视图，Index 和 DisplayPrediction。我尝试使用数据注释来验证提交表单中的数据，但它只显示错误消息并且不会阻止加载第二个视图。然而，最大的问题是，当第一个视图返回时，输入到文本框中的信息似乎只是简单地重置为默认值。非常感谢您的帮助:)这是我当前的代码：

这是模型，我在这里保留需要从用户那里获取的字段，以及程序的功能（对字段的处理将生成应显示在第二个视图上的输出）：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.IO;
using System.Diagnostics;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;
using System.ComponentModel;

namespace MvcHaberman.Models
{
public class HabermanPrediction
{
    [Required]
    [Range(0,100)]
    public int age { set; get; }
    [Required]
    [Range(58, 69)]
    public int year { set; get; }
    [Required]
    public int axNodes { set; get; }
    [Required]
    [Range(1, 2, ErrorMessage="Survived = 1; Did not survive = 2")]
    public int survival { set; get; }

    public string answer { set; get; }

    public void generatePrediction()
    {
        StreamWriter i = new StreamWriter(@"input.arff");
        i.WriteLine(@"relation haberman\n\n@attribute     Age_of_patient_at_time_of_operation INTEGER\n@attribute Patients_year_of_operation  {58,59,60,61,62,63,64,65,66,67,68,69}\n@attribute Number_of_positive_axillary_nodes_detected INTEGER\n@attribute Survival_status {1,2}\n\n@data");
        i.WriteLine(age + "," + year + "," + axNodes + "," + survival);
        i.Close();
        Process genPrediction = new Process();
        genPrediction.StartInfo = new ProcessStartInfo()
        {
            CreateNoWindow = true,
            FileName = @"habermanCommand.bat",
            WindowStyle = ProcessWindowStyle.Hidden,
            Arguments = "cmd.exe"
        };
        genPrediction.Start();
        genPrediction.WaitForExit();
        genPrediction.Dispose();

        StreamReader readPrediction = new StreamReader(@"output.txt");
        string line = readPrediction.ReadLine();
        while (line != null)
        {
        if (line.Contains(':'))
        {
            string[] part = line.Split(':');
            if (part[2].Contains('+'))
            {
                string[] prediction = part[2].Split('+');
                if (part[2][0] == '1')
                    answer = "\t(Survived)\t\tProbability that your assessment was  incorrect:\t" + (Convert.ToDecimal(prediction[1].Trim()) * 100) + "%";
                else answer = "\t(Did not Survive)\tProbability that your assessment was incorrect:\t" + (Convert.ToDecimal(prediction[1].Trim()) * 100) + "%";
            }
            else
            {
                string line1 = "";
                string lineTrimmed = "";
                for (int j = 1; j < part[2].Length; j++)
                    line1 += part[2][j];
                for (int l = 0; l < line1.Length; l++)
                    if (line1[l] != ' ')
                        lineTrimmed += line1[l];
                if (part[2][0] == '1')
                    answer = "\t(Survived)\t\tProbability that your assessment was correct:\t" + (Convert.ToDecimal(lineTrimmed) * 100) + "%";
                else
                    answer = "\t(Did not Survive)\tProbability that your assessment was correct:\t" + (Convert.ToDecimal(lineTrimmed) * 100) + "%";
            }
            }
            line = readPrediction.ReadLine();
        }
        readPrediction.Close();
    }

}
}

控制器指定数据应在其间流动的两个视图：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using MvcHaberman.Models;
using DataAnnotationsExtensions;

namespace MvcHaberman.Controllers
{
public class HabermanController : Controller
{
    public ActionResult Index()
    {
        HabermanPrediction obj = new HabermanPrediction();

        if (ModelState.IsValid == false)
        {
            return Redirect("/Habberman/Index");
        }
        else return View(obj);
    }

    public ActionResult About()
    {
        return View();
    }

    public ActionResult DisplayPrediction(HabermanPrediction objOut)
    {   
        objOut.generatePrediction();
        return View(objOut);
    }
}
}

提交视图：

@model MvcHaberman.Models.HabermanPrediction
@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
    <legend>HabermanPrediction</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.age)

    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.age)
        @Html.ValidationMessageFor(model => model.age) 
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.year)
    </div>
    <div class="editor-field" >
        @Html.EditorFor(model => model.year)
        @Html.ValidationMessageFor(model => model.year) 
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.axNodes)
    </div>
    <div class="editor-field" >
        @Html.EditorFor(model => model.axNodes)
        @Html.ValidationMessageFor(model => model.axNodes)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.survival)
    </div>
    <div class="editor-field" > 
        @Html.EditorFor(model => model.survival)
        @Html.ValidationMessageFor(model => model.survival)
    </div>
    <p>
        @Html.ActionLink("Generate Prediction", "DisplayPrediction")

    </p>
</fieldset>
}

输出视图：

`@model MvcHaberman.Models.HabermanPrediction`
`@using MvcHaberman.Models`
<!DOCTYPE html>
<html>
<head>
    <title>DisplayPrediction</title>
</head>
@using (Html.BeginForm())
{
<body>
<div class= "label">
@Html.LabelFor(model => model.answer)
</div>
<div>
    <h1>@Model.age</h1>
    <h2>@Model.answer</h2>
</div>
</body>
}
</html>
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1 回答 1

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当您使用 View(obj) 方法时，它会使用名为 obj 的默认模型生成新视图。所以当页面刷新时，html元素的默认值设置为你的模型参数（在这个场景中是obj参数）。

于 2013-04-14T09:49:07.427 回答