如何在asp.net FormView控件中隐藏“编辑”按钮？

Question

我想隐藏位于FormView控件的ItemTemplate中的“ EditButton”。

这是我尝试过的FormView的OnDataBound代码：

protected void fvPhaudDets_OnDataBound(object sender, EventArgs e)
    {
        PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

        PrincipalSearchResult<Principal> groups = UserPrincipal.FindByIdentity(ctx, User.Identity.Name).GetAuthorizationGroups();

        IEnumerable<string> groupNames = groups.Select(x => x.Name);

        string mode = fvPhaudDets.CurrentMode.ToString();
        lblCrntMode.Text = mode;

        if (fvPhaudDets.CurrentMode == FormViewMode.ReadOnly)
        {
            Button editbtn = fvPhaudDets.FindControl("EditButton") as Button;

            //Determine authorization based on the user's AD security groups
            if (groupNames.Contains("SecGroup1"))
            {
                editbtn.Visible = false;
            }
            else
            {
                editbtn.Visible = true;
            }
        }
    }

这是我得到的错误：

System.NullReferenceException: 'Object reference not set to an instance of an object.'

也许问题在于代码是在页面上呈现整个FormView之前执行的？

如果当前用户是SecGroup1的成员，如何修改代码以确保FormView的ItemTemplate中的“ EditButton”被隐藏？

- 编辑 -

这按预期工作...

if (fvPhaudDets.CurrentMode == FormViewMode.ReadOnly)
    {
        LinkButton editbtn = fvPhaudDets.FindControl("EditButton") as LinkButton;

        if (editbtn != null && groupNames.Contains("SecGroup1"))
        {
            editbtn.Visible = true;
        }
    }

Answer 1

尝试这个：

protected void fvPhaudDets_DataBound(object sender, EventArgs e)
        {
          ((LinkButton) ((FormView)sender).FindControl("EditButton")).Visible = false;// Hides Edit button
          ((LinkButton) ((FormView)sender).FindControl("NewButton")).Visible = false;// Hides New button
          ((LinkButton) ((FormView)sender).FindControl("DeleteButton")).Visible = false;// Hides Delete button
        }

另一个解决方案：编辑模板，然后将链接按钮的属性更改为Visible= false或从模板中删除按钮本身。