剃刀页面异步任务返回到模式

我是Razor Pages的新手，我真的无法解决我的问题。

我有一个模式，我想在其中更新身份角色（添加/删除用户）。异步任务工作正常，我有成员和非成员的列表，但是模式在发布后关闭。在这种情况下，如何防止（模态关闭）正确的回报是什么？

C＃

public async Task<IActionResult> OnPostAddtoRoleAsync()
{
    if(Input != null) 
    { 
    ToolboxRoles role = await _RoleManager.FindByIdAsync(Input.Id);
    List<ToolboxUser> members = new List<ToolboxUser>();
    List<ToolboxUser> nonMembers = new List<ToolboxUser>();
    foreach (ToolboxUser user in _UserManager.Users)
    {
        var list = await _UserManager.IsInRoleAsync(user, role.Name) ? members : nonMembers;
        list.Add(user);
    }

        Input.Role = role; 
        Input.Members = members;
        Input.NonMembers = nonMembers;
    }
    return Page(); //I don't know what is the correct return action here, so the modal stay showed
}

函数调用：

                           <form method="post">
                                <button asp-page-handler="AddtoRole" asp-route-id="@item.Id" class="btn btn-default" data-id="@item.Id" data-name="@item.Name" data-toggle="modal"
                                        data-target="#EditRole" data-backdrop="static" data-keyboard="false" style="margin-bottom: 10px;">
                                    Update
                                </button>

模态：

<div id="EditRole" class="modal fade" role="dialog">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <div class="modal-header" style="background-color: #ffd800">
                <h4 class="modal-title" style="text-align:left">Update Role</h4>
            </div>
            <div class="modal-body" style="background-image: linear-gradient(#ffd800,#fff)">
                <form method="post">
                    <input type="text" id="modal_name" asp-for="Input.RName" />
                    <input type="text" id="modal_id" asp-for="Input.Id" />
                    @if (Model.Input != null)
                    {
                        <div class="row">
                            <div class="col-md-12" style="background-image: radial-gradient(#ffd800,#fff);border: 1px solid #f11322;margin-bottom: 10px;">
                                <h4 id="modal_text1" class="font-weight-bold" style="color: #f11322;"></h4>
                            </div>
                        </div>

                        <table class="table table-bordered table-sm">
                            @if (Model.Input.NonMembers.Count() == 0)
                            {
                                <tr><td colspan="2">All Users Are Members</td></tr>
                            }
                            else
                            {
                                @foreach (ToolboxUser user in Model.Input.NonMembers)
                                {
                                    <tr>
                                        <td>@user.UserName</td>
                                        <td>
                                            <input type="checkbox" name="AddIds" value="@user.Id">
                                        </td>
                                    </tr>
                                }
                            }
                        </table>

                        <div class="row">
                            <div class="col-md-12" style="background-image: radial-gradient(#ffd800,#fff);border: 1px solid #f11322;margin-bottom: 10px;">
                                <h4 id="modal_text2" class="font-weight-bold" style="color: #f11322;"></h4>
                            </div>
                        </div>
                        <table class="table table-bordered table-sm">
                            @if (Model.Input.Members.Count() == 0)
                            {
                                <tr><td colspan="2">All Users Are Members</td></tr>
                            }
                            else
                            {
                                @foreach (ToolboxUser user in Model.Input.Members)
                                {
                                    <tr>
                                        <td>@user.UserName</td>
                                        <td>
                                            <input type="checkbox" name="DeleteIds" value="@user.Id">
                                        </td>
                                    </tr>
                                }
                            }
                        </table>
                    }
                    <button asp-page-handler="UpdateRoles" class="btn btn-default">Save</button>
                </form>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            </div>
        </div>
    </div>
</div>

还有我用来将值传递给模态的JS：

$('#EditRole').on('show.bs.modal', function (event) {
    var button = $(event.relatedTarget); // Button that triggered the modal
    var id = button.data('id');
    var name = button.data('name');  // Extract info from data-* attributes
    // Update the modal's content
    document.getElementById('modal_id').setAttribute('value', id);
    document.getElementById('modal_name').setAttribute('value', name);
    var modal = $(this);
    modal.find('#modal_text1').text('Add Users to ' + name);
    modal.find('#modal_text2').text('Remove Users from ' + name);
});

谢谢，Devcore