在 ASP.NET MVC 中使用 POST 传递变量

发布于 2024-12-11 16:55:20 字数 780 浏览 0 评论 0原文

我试图在 asp.net MVC 中传递一个字符串变量。我使用断点，所以我看到它确实转到控制器中的正确方法，但发布的变量等于 null。

我的标记：

@{
    ViewBag.Title = "TestForm";
}

<h2>TestForm</h2>

@using (Html.BeginForm()) {
   <input type="text" id="testinput" />

    <input type="submit" value="TestForm" />
}

我的控制器：

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

[HttpPost]
public ActionResult TestForm(string testinput)
{
    Response.Write("[" + testinput + "]");

    return View();
}

我将断点放在第二个 TestForm 方法中，并且 testinput 为 null.... 我错过了什么吗？

注意：我意识到大多数时候我会使用模型来传递数据，但我想知道我也可以传递字符串。

作为同一问题的一部分，如何传递多个变量？我的控制器中的方法看起来像这样：

[HttpPost]
public ActionResult TestForm(string var1, var2)
{
}

原文

I am trying to pass a string variable inside asp.net MVC. I use breakpoints so I see that it does go to the correct method in the controller, but the variables posted are equal to null.

My markup:

@{
    ViewBag.Title = "TestForm";
}

<h2>TestForm</h2>

@using (Html.BeginForm()) {
   <input type="text" id="testinput" />

    <input type="submit" value="TestForm" />
}

My controller:

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

[HttpPost]
public ActionResult TestForm(string testinput)
{
    Response.Write("[" + testinput + "]");

    return View();
}

I put the breakpoint inside the second TestForm method and testinput is null....
Am I missing something?

Note: I realize that most of the time I will be using the model to pass data around, but I would like to know that I can pass strings as well.

As part of the same question, how do I pass several variables? Would the method in my controller look like this:

[HttpPost]
public ActionResult TestForm(string var1, var2)
{
}

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丧 2024-12-18 16:55:20

对我来说，您似乎设置了 id 而不是名称。我每天都使用 MVC3，所以我不会重现你的示例。（我醒了 20 个小时编程；）但仍然有动力提供帮助）如果它不起作用，请告诉我。但对我来说，看起来你必须设置“name”属性......而不是 id 属性。尝试一下...如果不起作用，我现在正在等待帮助您。

     <input type="text" id="testinput" name="testinput" />

For me it looks like that you set the id not the name. I use MVC3 every day, so i dont reproduce your sample. (I am awake for 20 hours programming ;) but still motivated to help ) Please tell me if it dont work. But for me it looks like you have to set the "name" property ... not the id property. Try that ... i am waiting right now to help you if it does not work.

     <input type="text" id="testinput" name="testinput" />

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负佳期 2024-12-18 16:55:20

另外一点要注意的是，像您这样传递变量并没有什么问题，但更有效的方法是传递强类型视图模型，使您能够利用 MVC 的许多优点：

强类型视图
MVC 模型绑定
Html 助手

创建一个新的视图模型：

public class TestModel
{
    public string TestInput { get; set; }
}

您的测试控制器：

    [HttpGet]
    public ActionResult TestForm()
    {
        return View();
    }

    [HttpPost]
    public ActionResult TestForm(FormCollection collection)
    {
        var model = new TestModel();
        TryUpdateModel(model, collection);

        Response.Write("[" + model.TestInput + "]");

        return View();
    }

您的视图：

@model <yourproject>.Models.TestModel

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <title>TestForm</title>
</head>
<body>
    <div>
        @using(Html.BeginForm())
        {
            <div class="editor-label">
                @Html.LabelFor(m => m.TestInput)
            </div>
            <div class="editor-label">
                @Html.TextBoxFor(m => m.TestInput)
            </div>
            <input type="submit" value="Test Form"/>
        }
    </div>
</body>
</html>

On a slightly separate note there is nothing wrong with passing variables like you are, but a more efficient way would be to pass around a strongly typed view model allowing you to take advantage of many aspects of MVC's goodness:

strongly-typed views
MVC Model Binding
Html Helpers

Create a new view model:

public class TestModel
{
    public string TestInput { get; set; }
}

Your test controller:

    [HttpGet]
    public ActionResult TestForm()
    {
        return View();
    }

    [HttpPost]
    public ActionResult TestForm(FormCollection collection)
    {
        var model = new TestModel();
        TryUpdateModel(model, collection);

        Response.Write("[" + model.TestInput + "]");

        return View();
    }

Your view:

@model <yourproject>.Models.TestModel

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <title>TestForm</title>
</head>
<body>
    <div>
        @using(Html.BeginForm())
        {
            <div class="editor-label">
                @Html.LabelFor(m => m.TestInput)
            </div>
            <div class="editor-label">
                @Html.TextBoxFor(m => m.TestInput)
            </div>
            <input type="submit" value="Test Form"/>
        }
    </div>
</body>
</html>

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