Passing variables with POST in ASP.NET MVC

问题

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)
{
}

回答1:

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" />

回答2:

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>

来源：https://stackoverflow.com/questions/7856285/passing-variables-with-post-in-asp-net-mvc

标签

asp.net-mvc

http-post