Checkboxlist检查/取消选中事件 [英] Checkboxlist check/uncheck event

问题描述

我有一个复选框列表



< asp：CheckBoxList id =check1AutoPostBackTrueTextAlignRightOnSelectedIndexChanged =Checkrunatserver >









功能：



子检查（ByVal发送者为对象，ByVal e As EventArgs）

Dim sql As String

如果check1.SelectedItem。 Selected = True然后[code] ....



错误是：对象引用未设置为对象的实例。有没有更好的方法来检查列表项是否已选中或未选中？

I have a checkboxlist

<asp:CheckBoxList id="check1" AutoPostBack"True" TextAlign"Right" OnSelectedIndexChanged="Check" runat"server">




And the function:

Sub Check(ByVal sender As Object, ByVal e As EventArgs)
Dim sql As String
If check1.SelectedItem.Selected = True Then[code]....

The error is: Object reference not set to an instance of an object. Is there a better way to check if a list item is checked or unchecked?

推荐答案

尝试以下

Try the following

if (Checkboxlist1.Items[Index].Selected)
            {
                Response.Write("Try this");
            }

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