ASP.NET MVC 将数据从视图传递到控制器

我有一个带有网格的视图，其中包含添加到工作站的项目。用户可以从下拉列表中选择一个项目，然后单击一个操作链接，该链接调用控制器将该项目添加到工作站。我可以通过读取控制器的 Post 操作中的 FormCollection 对象来使其工作。

<p>
    <% using(Html.BeginForm("AddItem", "Home")) { %>
    <label for="ItemID">Item:</label>
    <%= Html.DropDownList("ItemID", Model.ItemsList) %>
    <%= Html.Hidden("WorkstationID", Model.Workstation.RecordID) %>
    <input type="submit" value="Submit" />
    <% } %>
</p>

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AddItem(FormCollection formValue)
{
    long workstationId = Convert.ToInt64(formValue["WorkstationID"]);
    long itemId = Convert.ToInt64(formValue["ItemID"]);

    Workstation workstation = itilRepository.FindWorkstation(workstationId);
    Item item = itilRepository.FindItem(itemId);

    itilRepository.AddItem(workstation, item);
    itilRepository.Save();

    return Content("Item added successfully!");
}

我想要做的是能够使用 Ajax.ActionLink 向控制器提交workstationId 和 itemId 这两个参数，并将添加的新项目插入到网格中。我像这样渲染网格：

<table>
      <tr>
        <th></th>
      <th>
        Name
      </th>
      <th>
        Service Tag
      </th>
      <th>
        Serial Number
      </th>
    </tr>

    <% foreach (var item in Model.Items) { %>

    <tr>
      <td>
        <%= Html.ActionLink("Edit", "ItemEdit", new { id = item.RecordID }) %> |
        <%= Html.ActionLink("Details", "ItemDetails", new { id = item.RecordID   })%>
      </td>
      <td>
        <%= Html.Encode(item.Name) %>
      </td>
      <td>
        <%= Html.Encode(item.ServiceTag) %>
      </td>
      <td>
        <%= Html.Encode(item.SerialNumber) %>
      </td>
    </tr>

    <% } %>

</table>

我遇到的问题是，当我使用 ActionLink 提交时，我无法弄清楚如何将参数传递给控制器​​以及如何在不重新加载整个视图的情况下更新网格。

我真的很感谢对此的一些帮助，甚至是具有类似功能的教程的链接。

谢谢你！

这是工作版本，一个问题是当控制器返回部分视图（即所有被渲染的部分）时，实际页面消失了。

<% using (Ajax.BeginForm("AddItem", null, 
        new AjaxOptions
        {
            UpdateTargetId = "ResultsGoHere",
            InsertionMode = InsertionMode.Replace
        }, 
        new { @id = "itemForm" } ))
{ %>

    <label for="ItemID">Item:</label>
    <%= Html.DropDownList("itemId", Model.ItemsList) %>
    <%= Html.Hidden("workstationId", Model.Workstation.RecordID) %>

    <a href="#" onclick="$('#itemForm').submit();">Submit</a>

    <div id="ResultsGoHere">
        <% Html.RenderPartial("WorkstationItems", Model.Items); %>
    </div>

<% } %>

不确定原因是什么，替换之前工作正常，但控制器没有获取下拉值。现在控制器正在获取值，但返回的部分视图会替换整个页面。

行动方法：

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AddItem(string workstationId, string itemId)
{
    long lworkstationId = Convert.ToInt64(workstationId);
    long litemId = Convert.ToInt64(itemId);

    Workstation workstation = itilRepository.FindWorkstation(lworkstationId);
    Item item = itilRepository.FindItem(litemId);

    IQueryable<Item> items = itilRepository.AddItem(workstation, item);
    itilRepository.Save();

    return PartialView("WorkstationItems", items);
}

这是完成所有工作的视图的 HTML：

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ITILDatabase.Models.WorkstationFormViewModel>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
    Workstation Details
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <script src="/Scripts/MicrosoftAjax.js" type="text/javascript"></script>
    <script src="/Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
    <link type="text/css" href="/../Content/css/ui-lightness/jquery-ui-1.7.2.custom.css" rel="stylesheet" />    
    <script type="text/javascript" src="/../Content/js/jquery-1.3.2.min.js"></script>
    <script type="text/javascript" src="/../Content/js/jquery-ui-1.7.2.custom.min.js"></script>

    <h2>
        Workstation Details</h2>
    <fieldset>
        <legend>Fields</legend>
        <p>
            Record ID:
            <%= Html.Encode(Model.Workstation.RecordID) %>
        </p>
        <p>
            Name:
            <%= Html.Encode(Model.Workstation.Name) %>
        </p>
        <p>
            Description:
            <%= Html.Encode(Model.Workstation.Description) %>
        </p>
        <p>
            Site:
            <%= Html.Encode(Model.Workstation.Site.Name) %>
        </p>
        <p>
            Modified By:
            <%= Html.Encode(Model.Workstation.ModifiedBy) %>
        </p>
        <p>
            Modified On:
            <%= Html.Encode(String.Format("{0:g}", Model.Workstation.ModifiedOn)) %>
        </p>
        <p>
            Created By:
            <%= Html.Encode(Model.Workstation.CreatedBy) %>
        </p>
        <p>
            Created On:
            <%= Html.Encode(String.Format("{0:g}", Model.Workstation.CreatedOn)) %>
        </p>
    </fieldset>
    <fieldset>
        <legend>People</legend>
        <% Html.RenderPartial("WorkstationPeople", Model.People); %>
    </fieldset>
    <fieldset>
        <legend>Positions</legend>
        <% Html.RenderPartial("WorkstationPositions", Model.Positions); %>
    </fieldset>
    <fieldset>
        <legend>Items</legend>

            <% using (Ajax.BeginForm("AddItem", "Home", null, 
                    new AjaxOptions
                    {
                        UpdateTargetId = "ResultsGoHere",
                        InsertionMode = InsertionMode.Replace
                    }, 
                    new { @id = "itemForm" } ))
            { %>

                <label for="ItemID">Item:</label>
                <%= Html.DropDownList("itemId", Model.ItemsList) %>
                <%= Html.Hidden("workstationId", Model.Workstation.RecordID) %>

                <a href="#" onclick="$('#itemForm').submit();">Submit</a>

                <div id="ResultsGoHere">
                    <% Html.RenderPartial("WorkstationItems", Model.Items); %>
                </div>

            <% } %>
    </fieldset>
    <br />
    <p>
        <%=Html.ActionLink("Edit", "WorkstationEdit", new { id = Model.Workstation.RecordID }) %>
        |
        <%=Html.ActionLink("Back to List", "Index") %>
    </p>
</asp:Content>

您期望 AJAX 调用得到什么结果？

你可以使用AjaxHelper对象的辅助方法而不是HtmlHelper呈现链接。例如，要使用 AJAX HttpPOST 调用获取新内容并将其插入到<div>id 设置为ResultsGoHere您呈现以下链接：

<%= Ajax.ActionLink("Edit", "ItemEdit", 
                         new {
                             itemId = item.RecordId, 
                             workstationId = myWorkStationId
                         },
                         new AjaxOptions {
                             HttpMethod="POST",
                             UpdateTargetId="ResultsGoHere",
                             InsertionMode = InsertionMode.Replace 
                         }) %>

In your AcionMethod，你可以简单地测试Request.IsAjaxRequest()决定返回什么：

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult ItemEdit(string itemId, string workstationId) {
    // edit the item and get it back

    if (Request.IsAjaxRequest()) {
        return PartialView("SingleItem", item);
    }
    return RedirectToAction("ItemEdit", new { itemId = item.RecordId, workstationId = workstationId });
}

// fallback for get requests
public ActionResult ItemEdit(string itemId, string workstationId)
{
    // do stuff and return view
}