C# winform ComboBox绑定数据源时触发SelectedIndexChanged事件的处理

ComboBox二级联动时，发现一个问题。如下

  var wardList = (from ward in alarmInfoListselect new{ward.AlarmJQ,ward.AlarmJQName}).Distinct();List<WardInfo> wiList = new List<WardInfo>();foreach (var ward in wardList){WardInfo wi = new WardInfo();wi.AlarmJQ = ward.AlarmJQ;wi.AlarmJQName = ward.AlarmJQName;wiList.Add(wi);}cboWard.DataSource = wiList;cboWard.ValueMember = "AlarmJQ";cboWard.DisplayMember = "AlarmJQName";

 private void cboWard_SelectedIndexChanged(object sender, EventArgs e){            var departmentList = (from department in alarmInfoListwhere department.AlarmJQ == cboWard.SelectedValue.ToString()select new{department.AlarmArea,department.AlarmAreaName}).Distinct();List<DepartmentInfo> diList = new List<DepartmentInfo>();DepartmentInfo diAll = new DepartmentInfo();diAll.AlarmArea = -1;diAll.AlarmAreaName = "全部";diList.Add(diAll);foreach (var department in departmentList){DepartmentInfo di = new DepartmentInfo();di.AlarmArea = department.AlarmArea;di.AlarmAreaName = department.AlarmAreaName;diList.Add(di);}cboDepartment.DataSource = diList;cboDepartment.DisplayMember = "AlarmAreaName";cboDepartment.ValueMember = "AlarmArea";}

cboWard绑定完后，会自动触发一遍SelectedIndexChanged事件，此时cboWard.SelectedValue是

List<WardInfo> wiList = new List<WardInfo>();

里面的WardInfo对象，而不是想要的

cboWard.ValueMember = "AlarmJQ";

value值，导致cboDepartment没有数据。

解决方式：

            List<WardInfo> wiList = new List<WardInfo>();foreach (var ward in wardList){WardInfo wi = new WardInfo();wi.AlarmJQ = ward.AlarmJQ;wi.AlarmJQName = ward.AlarmJQName;wiList.Add(wi);}//去除委托cboWard.SelectedIndexChanged -= new EventHandler(cboWard_SelectedIndexChanged);cboWard.DataSource = wiList;cboWard.ValueMember = "AlarmJQ";cboWard.SelectedIndexChanged += new EventHandler(cboWard_SelectedIndexChanged);cboWard.DisplayMember = "AlarmJQName";

注意：

            cboWard.SelectedIndexChanged += new EventHandler(cboWard_SelectedIndexChanged);cboWard.DisplayMember = "AlarmJQName";

DisplayMember一定要放到增加委托后面，否则联动失败。

如有什么问题，或者更好的方式，希望大家指正！

C# winform ComboBox绑定数据源时触发SelectedIndexChanged事件的处理相关推荐

ComboBox绑定数据源时触发SelectedIndexChanged事件的处理办法
转载:http://hi.baidu.com/haoyun2012/item/d780ca157a29b239b9318080 感谢原作者 ComboBox最经常使用的事件就是SelectedInde ...
解决winform combobox绑定数据时触发changed事件
我们在使用comboBox组件时如果同时设置了SelectedIndexChanged事件,在绑定combobox事件时会先触发一下changed事件,怎么能在绑定时不触发,再绑定之后的用户选择触发呢 ...
Winform 使用ComboBox.DataSource绑定数据会触发SelectedIndexChanged事件解决
1.绑定数据后再添加SelectedIndexChanged事件 2.SelectedIndexChanged事件中判断是否是选择项改变触发事件 if(ComboxBox1.ContainsFocus ...
(论坛答疑点滴)为什么设置了DropDownList的AutoPostBack=True还是不能触发SelectedIndexChanged事件？...
有人问 (1)AutoPostBack="True" <asp:DropDownList id="DropDownList1" runat="s ...
DropDownList 控件不能触发SelectedIndexChanged 事件的另一个原因
相信DropDownList 控件不能触发SelectedIndexChanged 事件已经不是什么新鲜事情了,原因也无外乎以下几种: 1.DropDownList 控件的属性 AutoPostBac ...
DropDownList 控件不能触发SelectedIndexChanged 事件
相信DropDownList 控件不能触发SelectedIndexChanged 事件已经不是什么新鲜事情了,原因也无外乎以下几种: 1.DropDownList 控件的属性 AutoPostBac ...
DropDownList控件不触发SelectedIndexChanged事件（转）
DropDownList控件不触发SelectedIndexChanged事件(转) 相信DropDownList 控件不能触发SelectedIndexChanged 原因以下几种: 1.DropD ...
GridView触发SelectedIndexChanged事件
首先在GridView中必须加上"选择"的按钮,然后在Page_Load中添加 view plaincopy to clipboard protected void Page_Lo ...
为什么设置了DropDownList的AutoPostBack=True还是不能触发SelectedIndexChanged事件？
有人问 (1)AutoPostBack="True" <asp:DropDownList id="DropDownList1" runat="s ...

C# winform ComboBox绑定数据源时触发SelectedIndexChanged事件的处理

C# winform ComboBox绑定数据源时触发SelectedIndexChanged事件的处理相关推荐

最新文章

热门文章