如何在组合框中添加选择选项 [英] how to add select option in combobox

问题描述

我想在c＃.net windows应用程序的combobox中添加--Select--选项。我正在使用visual studio 2008.在这个组合框中已经有数据如何在这个组合框中添加选择选项。

i尝试

combobox1.Items.Insert（0，选择）和combobox1.Items.add（0 new ListItem（0，select））;

但它不起作用。请帮忙。









提前感谢

i want to add a --Select-- option in combobox in c#.net windows application. i am using visual studio 2008. in this combobox have already datasouce how can i add the select option in this combobox.
i tried
combobox1.Items.Insert(0,"select") and combobox1.Items.add(0 new ListItem("0","select"));
but it's not working. please help.




thanks in advance

推荐答案

这将在组合框中插入新项目

CombBox1.Items.Insert（0，New Item）;

记住一件事一旦设置了数据源，就无法添加项目。因此，您在数据源本身中添加项目。喜欢：

DataTable dtCombo = new DataTable（）;

DataRow drow;

dtCombo.Columns.Add（Id，typeof（int ））;

dtCombo.Columns.Add（Name，typeof（string））;

drow = dtCombo.NewRow（）;

drow [0] = 1;

drow [1] =一个;

dtCombo.Rows.Add（卓尔）;

DataRow drow2 = dtCombo.NewRow（）;

drow2 [0] = 2;

drow2 [1] =选择;



dtCombo.Rows.InsertAt（drow2,0）;

dtCombo.AcceptChanges（）;



cmbTest。 DisplayMember =Name;

cmbTest.ValueMember =Id;

cmbTest.DataSource = dtCombo.DefaultView;

This will insert new item in combobox
CombBox1.Items.Insert(0, "New Item");
Remember one thing you can not add item once datasource is set. So, you add item in datasource itself. like:
DataTable dtCombo = new DataTable();
DataRow drow;
dtCombo.Columns.Add("Id",typeof(int));
dtCombo.Columns.Add("Name",typeof(string));
drow = dtCombo.NewRow();
drow[0]=1;
drow[1]="One";
dtCombo.Rows.Add(drow);
DataRow drow2 = dtCombo.NewRow();
drow2[0] = 2;
drow2[1] = "Select";

dtCombo.Rows.InsertAt(drow2, 0);
dtCombo.AcceptChanges();

cmbTest.DisplayMember = "Name";
cmbTest.ValueMember = "Id";
cmbTest.DataSource = dtCombo.DefaultView;

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