将数组的单个实例提交给控制器 [英] Submitting a single instance of an array to the controller

问题描述

我有一个像这样的视图模型:

I have a view model like:

public class OrganisationViewModel
{
    public string OrganisationName { get; set; }
    public List<BranchViewModel> Branches { get; set; }
    // more properties...
}

public class BranchViewModel
{
    public string BranchName { get; set; }
    // more properties...
}

组织"页面的外观如下:

This is how the Organisation page looks like:

我要实现的是允许用户更新单个BranchViewModel，因此我为每个分支创建了一个模态，当用户单击编辑分支"链接时，模态将打开:

What I want to achieve is to allow user to update a single BranchViewModel, so I have created a Modal for each Branch and when user click on the Edit branch link, the modal will open:

@for (int i = 0; i < Model.BranchViewModels.Count(); i++)
{
    var branchModalId = OrganisationHelper.GetBranchModalId(Model.BranchViewModels[i].BranchId);

    <div class="modal fade" id="@branchModalId" tabindex="-1" role="dialog" aria-hidden="true">
        <div class="modal-dialog modal-dialog-centered" role="document">
            <div class="modal-content">
                <form action="/organisation/updateBranch" method="post" role="form">
                    <div class="modal-body">
                        @Html.AntiForgeryToken()
                        <div class="form">
                            <div class="form-group">
                                @Html.LabelFor(m => Model.BranchViewModels[i].BranchName, htmlAttributes: new { @class = "", @maxlength = GlobalConstants.MaxLengthForLongName })
                                @Html.TextBoxFor(m => Model.BranchViewModels[i].BranchName, new { @class = "form-control input-text" })
                                @Html.ValidationMessageFor(m => Model.BranchViewModels[i].BranchName, "", new { @class = "text-danger" })
                            </div>

                            @*more properties...*@
                        </div>

                    </div>
                    <div class="modal-footer">
                        <input type="button" value="Cancel" class="btn btn-secondary-grey" data-dismiss="modal" />
                        <input type="submit" class="btn btn-primary-action" value="Save" />
                    </div>
                </form>
            </div>
        </div>
    </div>
}

现在的问题是，由于分支属于数组，因此页面上的输入将生成为数组，因此如下所示:

Now the problem is, since branches belong to an array the inputs on the page are generated as an array, so something like this:

<input class="form-control input-text" data-val="true" id="BranchViewModels_0__BranchName" name="BranchViewModels[0].BranchName" readonly="readonly" type="text" value="35671900246">

因此，当我将更改提交到分支时，值将作为List传递给控制器​​，因此该控制器将接受一个分支的列表:

So when I submit the changes to the branch, the values are passed to the controller as List, so this controller will accept a List of one Branch:

public ActionResult UpdateBranch(List<BranchViewModel> branchViewModel)
{
}

我想要实现的是能够将单个分支传递给控制器​​，所以我希望控制器的签名像这样:

What I want to achieve is to be able to pass the single branch to the controller, so I want the signature of the controller to be like:

public ActionResult UpdateBranch(BranchViewModel branchViewModel)
{
}

但是我需要将分支显示为HTML中的数组，否则我将获得重复的输入ID ...实现此目的的最佳方法是什么?

But I need the branch to be rendered as an array in the HTML, otherwise I will get duplicated input Ids... what is the best way to achieve this?

推荐答案

ASP.NET MVC序列化可用于html元素名称.当您通过for循环创建索引器时，索引器将带有带有_i__的html元素名称(其中i是该集合中分支的索引). 因此，您可以尝试使用foreach，而不是使用索引器(通过for循环访问Model.BranchViewModels [i]).

ASP.NET MVC serialization works on html element names. Indexers will have html element names with _i__ (where i is index of branch in that collection) when you create them via for loop. So, instead of using indexers (accessing Model.BranchViewModels[i] via for loop), you can try using foreach.

@{
    var idx = 0;
}
@foreach (var branch in Model.BranchViewModels)
{
    var branchModalId = OrganisationHelper.GetBranchModalId(branch.BranchId);

    <div class="modal fade" id="@branchModalId" tabindex="-1" role="dialog" aria-hidden="true">
        <div class="modal-dialog modal-dialog-centered" role="document">
            <div class="modal-content">
                <form action="/organisation/updateBranch" method="post" role="form">
                    <div class="modal-body">
                        @Html.AntiForgeryToken()
                        <div class="form">
                            <div class="form-group">
                                @Html.LabelFor(m => branch.BranchName, htmlAttributes: new { @class = "", @maxlength = GlobalConstants.MaxLengthForLongName })
                                @Html.TextBoxFor(m => branch.BranchName, new { @class = "form-control input-text", @id= Model.BranchViewModels[idx].BranchName})
                                @Html.ValidationMessageFor(m => branch.BranchName, "", new { @class = "text-danger" })
                            </div>

                            @*more properties...*@
                        </div>

                    </div>
                    <div class="modal-footer">
                        <input type="button" value="Cancel" class="btn btn-secondary-grey" data-dismiss="modal" />
                        <input type="submit" class="btn btn-primary-action" value="Save" />
                    </div>
                </form>
            </div>
        </div>
    </div>
    idx++;
}

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