21

我在一个页面中有多个下拉列表,如果用户选择一个显示全部禁用的复选框,我想禁用所有。到目前为止,我有这段代码,但它不起作用。有什么建议么?

foreach (Control c in this.Page.Controls)
{
    if (c is DropDownList)
        ((DropDownList)(c)).Enabled = false;
}
4

9 回答 9

39

每个控件都有子控件,因此您需要使用递归来访问它们:

protected void DisableControls(Control parent, bool State) {
    foreach(Control c in parent.Controls) {
        if (c is DropDownList) {
            ((DropDownList)(c)).Enabled = State;
        }

        DisableControls(c, State);
    }
}

然后像这样调用它:

protected void Event_Name(...) {
    DisableControls(Page,false); // use whatever top-most control has all the dropdowns or just the page control
} // divs, tables etc. can be called through adding runat="server" property
于 2009-02-02T23:10:44.063 回答
32

我知道这是一个旧帖子,但这就是我刚刚解决这个问题的方法。根据标题“如何禁用 ASP.NET 页面中的所有控件?” 我使用反射来实现这一点;它适用于所有具有 Enabled 属性的控件类型。只需调用传入父控件(即窗体)的 DisableControls。

C#:

private void DisableControls(System.Web.UI.Control control)
{
    foreach (System.Web.UI.Control c in control.Controls) 
    {
        // Get the Enabled property by reflection.
        Type type = c.GetType();
        PropertyInfo prop = type.GetProperty("Enabled");

        // Set it to False to disable the control.
        if (prop != null) 
        {
            prop.SetValue(c, false, null);
        }

        // Recurse into child controls.
        if (c.Controls.Count > 0) 
        {
            this.DisableControls(c);
        }
    }
}

VB:

    Private Sub DisableControls(control As System.Web.UI.Control)

        For Each c As System.Web.UI.Control In control.Controls

            ' Get the Enabled property by reflection.
            Dim type As Type = c.GetType
            Dim prop As PropertyInfo = type.GetProperty("Enabled")

            ' Set it to False to disable the control.
            If Not prop Is Nothing Then
                prop.SetValue(c, False, Nothing)
            End If

            ' Recurse into child controls.
            If c.Controls.Count > 0 Then
                Me.DisableControls(c)
            End If

        Next

    End Sub
于 2013-04-09T15:15:49.127 回答
19

如果您将所有要禁用的控件放在一个面板中,然后启用/禁用该面板,那将是最简单的。

于 2009-02-02T23:04:22.237 回答
9

在要禁用的页面部分周围放置一个面板:

   < asp:Panel ID="pnlPage" runat="server" >
      ...
   < /asp:Panel >

Page_Load 内部:

   If Not Me.Page.IsPostBack Then
      Me.pnlPage.Enabled = False
   End If

... 或 C# 等价物。:o)

于 2012-10-30T17:40:23.563 回答
2

你必须这样做递归,我的意思是你必须禁用控件的子控件:

protected void Page_Load(object sender, EventArgs e)
{
  DisableChilds(this.Page);
}

private void DisableChilds(Control ctrl)
{
   foreach (Control c in ctrl.Controls)
   {
      DisableChilds(c);
      if (c is DropDownList)
      {
           ((DropDownList)(c)).Enabled = false;
      }
    }
}
于 2009-02-02T23:15:25.817 回答
2

我正在使用 ASP.Net 和 HTML 控件,我确实喜欢这样

public void DisableForm(ControlCollection ctrls)
    {
        foreach (Control ctrl in ctrls)
        {
            if (ctrl is TextBox)
                ((TextBox)ctrl).Enabled = false;
            if (ctrl is Button)
                ((Button)ctrl).Enabled = false;
            else if (ctrl is DropDownList)
                ((DropDownList)ctrl).Enabled = false;
            else if (ctrl is CheckBox)
                ((CheckBox)ctrl).Enabled = false;
            else if (ctrl is RadioButton)
                ((RadioButton)ctrl).Enabled = false;
            else if (ctrl is HtmlInputButton)
                ((HtmlInputButton)ctrl).Disabled = true;
            else if (ctrl is HtmlInputText)
                ((HtmlInputText)ctrl).Disabled = true;
            else if (ctrl is HtmlSelect)
                ((HtmlSelect)ctrl).Disabled = true;
            else if (ctrl is HtmlInputCheckBox)
                ((HtmlInputCheckBox)ctrl).Disabled = true;
            else if (ctrl is HtmlInputRadioButton)
                ((HtmlInputRadioButton)ctrl).Disabled = true;

            DisableForm(ctrl.Controls);
        }
    }

像这样称呼

DisableForm(Page.Controls);
于 2014-08-29T16:55:15.800 回答
1

这是一个 VB.NET 版本,它还带有一个可选参数,因此它也可以用于启用控件。

Private Sub SetControls(ByVal parentControl As Control, Optional ByVal enable As Boolean = False)

    For Each c As Control In parentControl.Controls
        If TypeOf (c) Is CheckBox Then
            CType(c, CheckBox).Enabled = enable
        ElseIf TypeOf (c) Is RadioButtonList Then
            CType(c, RadioButtonList).Enabled = enable
        End If
        SetControls(c)
    Next

End Sub
于 2009-02-10T20:15:49.417 回答
1
  private void ControlStateSwitch(bool state)
{
    foreach (var x in from Control c in Page.Controls from Control x in c.Controls select x)
        if (ctrl is ASPxTextBox)

            ((ASPxTextBox)x).Enabled = status;

        else if (x is ASPxDateEdit)

            ((ASPxDateEdit)x).Enabled = status;
}

我使用 linq 方法。使用 devExpress 时,您必须包含 DevExpress.Web.ASPxEditors 库。

于 2012-12-04T11:19:29.053 回答
0

如果您真的想禁用页面上的所有控件,那么最简单的方法是将表单的 Disabled 属性设置为 true。

ASPX:

<body>
    <form id="form1" runat="server">
      ...
    </form>
</body>

代码隐藏:

protected void Page_Load(object sender, EventArgs e)
{
    form1.Disabled = true;
}

但当然,这也会禁用您的复选框,因此您将无法单击复选框以重新启用控件。

于 2009-02-10T20:22:17.123 回答