关于将按钮连接到ActionResult的说明

我仍在学习MVC，这是我长期使用Web Forms的结果。我试图理解的一件事是如何将按钮/输入与ActionResult相关联。

我一直在使用的一个项目是Contoso大学。在该项目中，他们有一个CourseController，在Course/Edit.cshtml页面中，他们使用的表单没有指定控制器或操作方法。因此，我不完全清楚表单是如何知道它需要去哪里的，因为表单或按钮都不指向控制器/操作方法。是因为页面名为Edit，ActionResult也名为Edit吗？

这是控制器中的Contoso.cs.html和ActionResult。

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    <div class="form-horizontal">
        <h4>Course</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.CourseID)
        <div class="form-group">
            @Html.LabelFor(model => model.CourseID, new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DisplayFor(model => model.CourseID)
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Title, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Title, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Title, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Credits, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Credits, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Credits, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            <label class="control-label col-md-2" for="DepartmentID">Department</label>
            <div class="col-md-10">
                @Html.DropDownList("DepartmentID", null, htmlAttributes: new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.DepartmentID, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Save" class="btn btn-default" />
            </div>
        </div>
    </div>
}
 [HttpPost, ActionName("Edit")]
        [ValidateAntiForgeryToken]
        public ActionResult EditPost(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            var courseToUpdate = db.Courses.Find(id);
            if (TryUpdateModel(courseToUpdate, "",
               new string[] { "Title", "Credits", "DepartmentID" }))
            {
                try
                {
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
                catch (RetryLimitExceededException /* dex */)
                {
                    //Log the error (uncomment dex variable name and add a line here to write a log.
                    ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists, see your system administrator.");
                }
            }
            PopulateDepartmentsDropDownList(courseToUpdate.DepartmentID);
            return View(courseToUpdate);
        }

我在搜索中发现的另一件事是，开发人员在表单中调用控制器/动作方法，并在按钮或输入中直接指向控制器/动作方式。

在这里，他们将其添加到表单中。

@using (Html.BeginForm("SignUp", "Account", FormMethod.Post))
{
    <!-- form goes here -->
    <input type="submit" value="Sign Up" />
}

在这里，它直接在按钮中。

<button type="button" onclick="location.href='@Url.Action("MyAction", "MyController")'" >

使用这些方法有什么优点/缺点吗？如果将控件/方法放在表单声明中或直接放在按钮上，我会更清楚。

<form action="/Post/Create" method="post"></form>

@using (Html.BeginForm("Edit", "Post"))
{
    <input type="text" name="postName" />
}

<form action="/Post/Edit" method="post">
   <input type="text" name="postName" />
</form>

[HttpPost]
public ActionResult Edit(string postName)
{
 //to do  : Do something useful
  return View();
}

@using (Html.BeginForm("Edit","Post",FormMethod.Get))
{    
}

<button type="button" onclick="location.href='@Url.Action("MyAction", "MyController")'" >

@using (Html.BeginForm("Edit", "Post"))
{
  <input type="submit" />
}