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MVC空模型问题

发布于 2024-09-04 17:59:41 字数 214 浏览 4 评论 0原文

我创建了两个创建操作..一个用于调用创建视图，另一个用于使用 httppost 处理创建视图。

当我调用创建视图时，它会正确发布，下拉列表等等。问题是，当我填写创建表单并单击提交按钮时，出现错误；

你调用的对象是空的。

我的第一个想法是我将空模型传递给 httppost 创建操作。我如何检查是否将空模型传递给 httppost 创建操作？

谢谢

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枫以 2024-09-11 17:59:41

您到底在哪里得到这个异常？是在控制器操作中还是在渲染视图时？通常的范例如下：

public ActionResult New()
{
    // as you will be creating a new entity you don't need to pass
    // any model here unless your view depends on some property of the model
    return View();
}

[HttpPost]
public ActionResult Create(SomeModel model)
{
    // The model parameter here will be automatically instantiated 
    // by the default model binder and its properties will be 
    // initialized to the values entered by the user in the view
    if (ModelState.IsValid)
    {
        // save the entity
        Repository.Save(model);
        // redirect back to the index action
        return RedirectToAction("Index");
    }
    // validation failed => pass the model to the view in order to
    // preserve values and show validation errors
    return View("New", model);
}

Where exactly you are getting this exception? Is it in the controller action or while rendering the view? The usual paradigm is the following:

public ActionResult New()
{
    // as you will be creating a new entity you don't need to pass
    // any model here unless your view depends on some property of the model
    return View();
}

[HttpPost]
public ActionResult Create(SomeModel model)
{
    // The model parameter here will be automatically instantiated 
    // by the default model binder and its properties will be 
    // initialized to the values entered by the user in the view
    if (ModelState.IsValid)
    {
        // save the entity
        Repository.Save(model);
        // redirect back to the index action
        return RedirectToAction("Index");
    }
    // validation failed => pass the model to the view in order to
    // preserve values and show validation errors
    return View("New", model);
}

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