如何禁用ASP.NET页面中的所有控件?

时间:2009-02-02 23:01:13

标签: c# webforms asp.net-controls

我在一个页面中有多个下拉列表,如果用户选择一个禁用全部的复选框,则要禁用所有。到目前为止,我有这个代码,它无法正常工作。有什么建议吗?

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

9 个答案:

答案 0 :(得分:37)

每个控件都有子控件,因此您需要使用递归来实现所有控件:

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

        DisableControls(c, State);
    }
}

然后这样称呼它:

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

答案 1 :(得分:29)

我知道这是一个老帖子,但这就是我刚刚解决了这个问题的方法。根据标题“我如何禁用ASP.NET页面中的所有控件?”我用反射来达到这个目的;它适用于具有Enabled属性的所有控件类型。只需调用在父控件中传递的DisableControls(即表单)。

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

答案 2 :(得分:19)

如果您在面板中放置要禁用的所有控件,然后启用/禁用面板,这将是最简单的。

答案 3 :(得分:8)

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:

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

...或C#等价物。 :O)

答案 4 :(得分:2)

我正在使用ASP.Net和HTML控件我喜欢这个

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);
        }
    }

这样称呼

DisableForm(Page.Controls);

答案 5 :(得分:1)

你必须递归,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;
      }
    }
}

答案 6 :(得分:1)

这是一个VB.NET版本,它也带有一个可选参数,因此它也可用于启用控件。

Private Sub SetControls(ByVal parentControl As Control,可选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

答案 7 :(得分: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 aproach。使用devExpress时,您必须包含 DevExpress.Web.ASPxEditors lib。

答案 8 :(得分:0)

如果您确实要在页面上禁用 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,因此您无法点击该复选框来重新启用控件。