MVC 模型验证

发布于 2024-10-17 03:20:11 字数 489 浏览 0 评论 0原文

我有一个视图绑定到带有 DataAnnotations 的 ViewModel 进行验证，并且我有一个带有模型输入参数的操作（用于 ModelBinding）。我的代码看起来像......

public ActionResult MyMethod (MyModelDefinition model, string ddlValue){
    if (ModelState.IsValid) { return RedirectToAction ("...");}

    // If my model is not valid i want to change it and return the View Again...
    model.field1 = "xpto";

    return View(model);
}

当我这样做时，我遇到了验证错误（即使在我的 field1 中女巫是必需的，我在渲染视图之前填充它）。

我缺少什么？

谢谢大家..

原文

I have a View binded to a ViewModel with DataAnnotations for validation and i have an Action with Model input parameter (for ModelBinding). My code looks like...

public ActionResult MyMethod (MyModelDefinition model, string ddlValue){
    if (ModelState.IsValid) { return RedirectToAction ("...");}

    // If my model is not valid i want to change it and return the View Again...
    model.field1 = "xpto";

    return View(model);
}

When i do this i have validation errors (even in my field1 witch is a required one and i fill it before my View was rendered).

What i'm missing?

Thank U All..

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吃兔兔 2024-10-24 03:20:11

如果您打算在控制器中修改该值，或者在渲染视图时，用于渲染该值的 HTML 帮助程序将首先在 POSTed 值中查找，然后在模型中查找，则需要从模型状态中删除该值。这是预期的行为。

[HttpPost]
public ActionResult MyMethod(MyModelDefinition model, string ddlValue)
{
    if (ModelState.IsValid) 
    { 
        return RedirectToAction ("...");
    }

    // Remove field1 from ModelState if you intend to 
    // modify it in the controller
    ModelState.Remove("field1");
    model.field1 = "xpto";
    return View(model);
}

You need to remove the value from the model state if you intend to modify it in the controller or when you render the view the HTML helper that you have used to render this value will first look in the POSTed values and after that in the model. That's the expected behavior.

[HttpPost]
public ActionResult MyMethod(MyModelDefinition model, string ddlValue)
{
    if (ModelState.IsValid) 
    { 
        return RedirectToAction ("...");
    }

    // Remove field1 from ModelState if you intend to 
    // modify it in the controller
    ModelState.Remove("field1");
    model.field1 = "xpto";
    return View(model);
}

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