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[英]How to disable the controls in an ASP.NET page when the usercontrol is selected?
[英]How do I disable all controls in ASP.NET page?
我在頁面中有多個下拉列表,如果用戶選擇一個禁用全部的復選框,則要禁用所有。 到目前為止,我有這個代碼,它無法正常工作。 有什么建議么?
foreach (Control c in this.Page.Controls)
{
if (c is DropDownList)
((DropDownList)(c)).Enabled = false;
}
每個控件都有子控件,因此您需要使用遞歸來實現所有控件:
protected void DisableControls(Control parent, bool State) {
foreach(Control c in parent.Controls) {
if (c is DropDownList) {
((DropDownList)(c)).Enabled = State;
}
DisableControls(c, State);
}
}
然后像這樣調用它:
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
我知道這是一個老帖子,但這就是我剛剛解決了這個問題的方法。 根據標題“我如何禁用ASP.NET頁面中的所有控件?” 我用反射來達到這個目的; 它適用於具有Enabled屬性的所有控件類型。 只需調用傳入父控件(即表單)的DisableControls即可。
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
如果您在面板中放置要禁用的所有控件,然后啟用/禁用面板,這將是最簡單的。
在要禁用的頁面部分周圍放置一個面板:
< asp:Panel ID="pnlPage" runat="server" >
...
< /asp:Panel >
在Page_Load里面:
If Not Me.Page.IsPostBack Then
Me.pnlPage.Enabled = False
End If
......或C#等價物。 :O)
我正在使用ASP.Net和HTML控件我喜歡這樣
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);
}
}
像這樣叫
DisableForm(Page.Controls);
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時,您必須包含DevExpress.Web.ASPxEditors lib。
你必須遞歸,我的意思是你必須禁用控件的子控件:
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;
}
}
}
這是一個VB.NET版本,它也帶有一個可選參數,因此它也可用於啟用控件。
Private Sub SetControls(ByVal parentControl As Control,可選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
如果您確實要禁用頁面上的所有控件,那么最簡單的方法是將表單的Disabled屬性設置為true。
ASPX:
<body>
<form id="form1" runat="server">
...
</form>
</body>
代碼隱藏:
protected void Page_Load(object sender, EventArgs e)
{
form1.Disabled = true;
}
但是,當然,這也會禁用您的復選框,因此您將無法單擊該復選框以重新啟用控件。
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