Identity角色管理四（删除角色）

[HttpPost]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Delete(string id)
{
    var role = await _roleManager.FindByIdAsync(id);
    if (role != null)
    {
        var result = await _roleManager.DeleteAsync(role);
        if (result.Succeeded)
        {
            return RedirectToAction(nameof(Index));
        }
    }
    return RedirectToAction(nameof(Index));
}

@model IEnumerable<Microsoft.AspNetCore.Identity.IdentityRole>

@{
    ViewData["Title"] = "Index";
}

<h1>Index</h1>

<p>
    <a asp-action="Create">添加角色</a>
</p>
<table class="table">
    <thead>
        <tr>
            <th>编号</th>
            <th>角色名</th>
            <th>操作</th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.Id)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Name)
                </td>
                <td>
                    <a asp-action="Edit" asp-route-id="@item.Id" class="btn btn-success btn-sm">编辑</a>
                    <a asp-action="Details" asp-route-id="@item.Id" class="btn btn-primary btn-sm">详情</a>
                    以下这里改了
                    <form asp-action="Delete" asp-route-id="@item.Id" method="post" id="DeleteForm">
                        <a href="javascript:document.getElementById(‘DeleteForm‘).submit()" class="btn btn-danger btn-sm">删除</a>
                    </form>
                </td>
            </tr>
        }
    </tbody>
</table>