如何用DefaultModelBinder绑定一个模型属性.净MVC2

Question

我有以下场景:

1. 我用实体框架实体(雇员)的模型填充了编辑/雇员视图
2. 我从Edit/Employee发布到Save/Employee控制器动作。保存/雇员操作期望另一种类型(EmployeeSave)，其雇员属性

这是Edit/Employee方法

    public ActionResult Edit(EmployeesEdit command)
    {
        var employee = command.Execute();
        if (employee != null)
        {
            return View(employee);
        }
        return View("Index");
    }

这是保存/雇员方法

  public ActionResult Save(EmployeesSave command)
    {
        var result = command.Execute();
        if (result)
        {
            return View(command.Employee);
        }
        return View("Error");
    }

这是EmployeeSave类

public class EmployeesSave
{
    public bool Execute()
    {
        // ... save the employee   
        return true;
    }
    //I want this prop populated by my model binder
    public Employee Employee { get; set; }  
}

MVC的DefaultModelBinder能够解析Employee类和EmployeeSave类。

Answer 1

这里可能需要使用BindAttribute。如果您的视图包含EmployeeSaveViewModel和Employee的属性，命名如下(我自创的属性名称)

<input type="text" name="EmployeeSaveViewModel.Property1" />
<input type="text" name="EmployeeSaveViewModel.Employee.Name" />
<input type="text" name="EmployeeSaveViewModel.Employee.SomeProperty" />

然后，你的动作看起来像这样:

[HttpPost]
public ActionResult Save([Bind(Prefix="EmployeeSaveViewModel")] 
                         EmployeeSaveViewModel vm)
{
    if(ModelState.IsValid)
    {
        // do something fancy
    }
    // go back to Edit to correct errors
    return View("Edit", vm);
}

Answer 2

您可以通过将编辑过的数据传递回处理HttpPost的Edit操作来解决这个问题。在内部创建EmployeeSave对象，并将返回给Edit操作的Employee的值分配给它的Employee属性。通过传递EmployeeSave对象调用Save操作。

[HttpGet]
public ActionResult Edit()
{
    return View();
}
[HttpPost]
public ActionResult Edit(Employee employee)
{
    EmployeeSave employeeSave = new EmployeeSave { Employee = employee };
    return View("Save", employeeSave);
}

另一个方法是使用EmployeeSave代替Employee作为你的模型。