本次示例主要是解决
CheckBoxList这样的List控件
在引发SelectedIndexChanged事件时
本身不能直接得到当前的操作Item
以及是哪种操作类型 选中? 还是 取消选中?
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示例代码如下:
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!IsPostBack)
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{
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//绑定CheckBoxList操作
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this.hidtxt_CheckBoxSelectValue.Value = "";//第一次绑定完CheckBoxList
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}
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}
9![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
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{
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//hidtxt_CheckBoxSelectValue 存储的是上次的点选值
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//如果上次是Page_Load 则hidtxt_CheckBoxSelectValue为空
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string sOld = this.hidtxt_CheckBoxSelectValue.Value.Trim();
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for (int i = 0; i < CheckBoxList1.Items.Count; i++)
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{
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//第一种情况
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//原来没有选中 当前却选中
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//则本次点击操作是:选中 并且点选的是这一个Item
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if (CheckBoxList1.Items[i].Selected)
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{
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if (!sOld.Contains(CheckBoxList1.Items[i].Value.Trim() + ","))
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{
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//进行相关处理
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Response.Write("本次是选中操作,操作的CheckBox的Text值是" + CheckBoxList1.Items[i].Text + "其Value值是" + CheckBoxList1.Items[i].Value);
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i = CheckBoxList1.Items.Count ;
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}
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}
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else
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{
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//第二种情况
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//原来有选中 当前却没选中
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//则本次点击操作是:取消选中 并且点选的是这一个Item
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if (sOld.Contains(CheckBoxList1.Items[i].Value.Trim() + ","))
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{
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//进行相关处理
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Response.Write("本次是取消选中操作,操作的CheckBox的Text值是" + CheckBoxList1.Items[i].Text + "其Value值是" + CheckBoxList1.Items[i].Value);
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i = CheckBoxList1.Items.Count;
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}
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}
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}
43![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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//保存这次的所有选中的值
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string sNew = "";
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foreach (ListItem item in CheckBoxList1.Items)
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{
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if (item.Selected)
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sNew += " " + item.Value.Trim() + ",";
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}
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this.hidtxt_CheckBoxSelectValue.Value = sNew;//为下一次的比较做准备
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}
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