如何在 mvc 视图内的视图条件下隐藏/显示按钮？

Question

我想在condition 上hide/show 和button，但不能在视图内进行。

@{
    ViewBag.Title = "Mapping";
    WebGrid grid = null;
    if (ViewBag.Mappings != null)
    {
        grid = new WebGrid(source: ViewBag.Mappings,
                                defaultSort: "Id",
                                canPage: true,
                                canSort: true,
                                rowsPerPage: 10);
    }
}
<h3>@ViewData["Message"]</h3>
@if (grid != null)
{
    @grid.GetHtml(
                tableStyle: "grid",
                headerStyle: "head",
                alternatingRowStyle: "alt",
                columns: grid.Columns(
    grid.Column("", header: null, format: @<text>@Html.ActionLink("Edit", "Index", new { uid = (Guid)item.id, userAction = "Edit" }, new { @class = "edit" })
    @Html.ActionLink("Delete", "Index", new { uid = (Guid)item.id, userAction = "Delete" }, new { @class = "Delete" })</text>),
                                            grid.Column("PricingSecurityID"),
                                            grid.Column("CUSIP"),
                                            grid.Column("Calculation")
                                          )

                )
}

if(@ViewBag.Mappings != null)
  {    
@Html.ActionLink("Update", "Index", new { userAction = "Update" }, new { @class = "Update" })
}

在上面的视图中，如果 ViewBag.Mappings != null 则我正在填充 webgrid。 如果填充了 webgrid，我需要在 webgrid 下显示一个Update 按钮，但是在条件下我哪里出错了？

Answer 1

将第 4 行的“@”移到底部：

之前：

if(@ViewBag.Mappings != null)

之后：

@if(ViewBag.Mappings != null)