C# 如何将项目添加到 ASP.NET 中的下拉列表？
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How to add an item to a drop down list in ASP.NET?
提问by Scorps
I want to add the "Add new" at a specific index, but I am not sure of the syntax. I have the following code
我想在特定索引处添加“添加新”，但我不确定语法。我有以下代码
protected void Page_Load(object sender, EventArgs e)
{
DRPFill();
if (!IsPostBack)
{
DropDownList1.Items.Add("Add New");
}
}
public void DRPFill()
{
if (!IsPostBack)
{
//Object
AddMajor objMajor = new AddMajor();
//Data Table
DataTable dtMajor = objMajor.find();
//Data Source
DropDownList1.DataSource = dtMajor;
DropDownList1.DataValueField = "MajorID";
DropDownList1.DataTextField = "MajorName";
//Data Bind
DropDownList1.DataBind();
}
}
回答by Ben Gulapa
Try this, it will insert the list item at index 0;
试试这个，它会在索引 0 处插入列表项；
DropDownList1.Items.Insert(0, new ListItem("Add New", ""));
回答by Full Time Skeleton
Which specific index? If you want 'Add New' to be first on the dropdownlist you can add it though the code like this:
具体哪个指标？如果您希望“添加新”成为下拉列表中的第一个，您可以通过如下代码添加它：
<asp:DropDownList ID="DropDownList1" AppendDataBoundItems="true" runat="server">
<asp:ListItem Text="Add New" Value="0" />
</asp:DropDownList>
If you want to add it at a different index, maybe the last then try:
如果您想将它添加到不同的索引，也许是最后一个，然后尝试：
ListItem lst = new ListItem ( "Add New" , "0" );
DropDownList1.Items.Insert( DropDownList1.Items.Count-1 ,lst);
回答by Full Time Skeleton
Try following code;
尝试以下代码；
DropDownList1.Items.Add(new ListItem(txt_box1.Text));
