使用控制器 ASP.NET MVC 4 设置文本框值

Question

是否可以使用控制器设置文本框的值？我的视图中有以下表格：

@Html.TextBoxFor(Models => Models.techNo, new { @class="form-control maintain-text", 

placeholder="Technician No..."})
<button type="submit" id="search" name="SubmitButton" value="search" class="btn btn-default">Search</button>

<td>First Name :</td>
<td>@Html.TextBoxFor(Models => Models.firstName, new { @class = "form-control", style = "width:380px;", disabled = "disabled" })</td>

<td>Last Name :</td>
<td>@Html.TextBoxFor(Models => Models.lastName, new { @class = "form-control", style = "width:380px;", disabled = "disabled" })</td>

型号：

public string techNo { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }

控制器：

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

[HttpPost]
public ActionResult ProcessTech(string SubmitButton)
{
    TechnicianFacade _oTechFacade = new TechnicianFacade();
    Technician _oTechnician = new Technician();

    string fName = Request.Form["firstName"].ToString().ToUpper();
    string lName = Request.Form["lastName"].ToString().ToUpper();

    switch (SubmitButton)
    {
        case "save": //add new technician
            {               
            }
            break;
        case "update": //update technician details
            {               
            }
            break;
        case "search": //search technician
            {
                try {
                    string id = Request.Form["techNo"].ToString().ToUpper();
                    if (isValid(id, "technician") == false) //search the id from the database
                    {
                        //do nothing
                    }
                    else //if id is valid
                    {
                        var tech = _oTechFacade.getTechnicians(id, _oAppSetting.ConnectionString)[0]; //data from the database
                        string fNameStr = tech.GetType().GetProperty("FIRSTNAME").GetValue(tech, null).ToString(); 
                        string lNameStr = tech.GetType().GetProperty("LASTNAME").GetValue(tech, null).ToString();

                        //When the the ID is found, 
                        //these are the values of the firstName & lastName that I want to set to the View

                        //Is it possible to set the values of the textboxes from here?
                    }
                }
                catch (Exception ex) { throw ex; }
            }
            break;
        case "delete":
            {               
            }
            break;
    }
    return View("Index");
}

基本上，在搜索 ID（假设其有效）之后，我想从数据库中获取 firstName 和 lastName 数据，然后将其显示到 View 以进行更新或删除。我已经尝试过 ViewBag、ViewData 和 TempData，但都不适合我。

编辑：

@model Maintenance_.Models.IndexModel
@{
ViewBag.Title = "Technician";    
}

<div id="page-wrapper">
    <div class = "row">
    <div class = "col-lg-12">
        <h1 class= "page-header"> Technician </h1>  
    </div>
</div>
....

Answer 1

当我看到您的代码时，您正在使用显式类型的视图并使用相同的视图进行插入和更新。在这种情况下，您必须像这样将模型返回到您的视图中：

 [HttpPost]

public ActionResult ProcessTech(string SubmitButton)
{
TechnicianFacade _oTechFacade = new TechnicianFacade();
Technician _oTechnician = new Technician();

string fName = Request.Form["firstName"].ToString().ToUpper();
string lName = Request.Form["lastName"].ToString().ToUpper();
YourModelName model = new YourModelName ();
switch (SubmitButton)
{
    case "save": //add new technician
        {               
        }
        break;
    case "update": //update technician details
        {               
        }
        break;
    case "search": //search technician
        {
            try {
                string id = Request.Form["techNo"].ToString().ToUpper();
                if (isValid(id, "technician") == false) //search the id from the database
                {
                    //do nothing
                }
                else //if id is valid
                {
                    var tech = _oTechFacade.getTechnicians(id, _oAppSetting.ConnectionString)[0]; //data from the database
                    string fNameStr = tech.GetType().GetProperty("FIRSTNAME").GetValue(tech, null).ToString(); 
                    string lNameStr = tech.GetType().GetProperty("LASTNAME").GetValue(tech, null).ToString();
                    model.firstname = fNameStr;
                    model.lastname = lNameStr;

                    //When the the ID is found, 
                    //these are the values of the firstName & lastName that I want to set to the View

                    //Is it possible to set the values of the textboxes from here?
                }
            }
            catch (Exception ex) { throw ex; }
        }
        break;
    case "delete":
        {               
        }
        break;
}
return View("Index",model);

}

Answer 2

这一行：

return View("Index");

没有将模型传递给索引视图。

您需要创建视图的实例，并设置其属性：

                    var model = new IndexModel();
                    ...
                    else //if id is valid
                    {
                        var tech = _oTechFacade.getTechnicians(id, _oAppSetting.ConnectionString)[0]; //data from the database
                        string fNameStr = tech.GetType().GetProperty("FIRSTNAME").GetValue(tech, null).ToString(); 
                        string lNameStr = tech.GetType().GetProperty("LASTNAME").GetValue(tech, null).ToString();

                        //When the the ID is found, we populate our model 
                        //so it can be displayed 
                        model.firstname = fNameStr;
                        model.lastname = lNameStr;
                    }

现在你可以这样做了：

return View("Index", model);

Answer 3

@Brendan Green 的回答是正确的，您需要将模型传递给视图，然后您可以使用向 Html Helper 添加新属性来设置文本框值。

@Html.TextBoxFor(Models => Models.firstName, new { @class = "form-control", style = "width:380px;", disabled = "disabled", @value = Model.firstName  })

注意这里的值由@value 属性设置

更新：

将 元素更改为 还将 id 更改为 SubmitButton 和 Name 也 SubmitButton （id 和 Name 值相同是好的）然后再试一次，您的 switch 语句似乎有问题。调试它然后你就可以看到发生了什么。 还将模型传递给视图，视图的名称应该是索引，然后视图正确调用。