C# 动态绑定下拉控件';选择
我有一个主页,在那里我通过C# 动态绑定下拉控件';选择,c#,asp.net,drop-down-menu,C#,Asp.net,Drop Down Menu,我有一个主页,在那里我通过控件创建了div。现在,在按钮上的单击事件中,我将页面重定向到注册表单,其中有一个控件 在注册页面的Page\u Load事件中,我正在填充数据库中的下拉列表,并设置DataTextField和DataValueField 现在,我将EventTypeID分配给下拉列表.DataValueField和Name分配给下拉列表.DataTextField。我还检查了呈现时的下拉列表是否在值字段中包含EventTypeID 代码如下: protected void Page_
控件创建了div。现在,在
按钮上的单击事件中,我将页面重定向到注册表单,其中有一个
控件
在注册页面的Page\u Load
事件中,我正在填充数据库中的下拉列表,并设置DataTextField
和DataValueField
现在,我将EventTypeID
分配给下拉列表.DataValueField
和Name
分配给下拉列表.DataTextField
。我还检查了呈现时的下拉列表是否在值
字段中包含EventTypeID
代码如下:
protected void Page_Load(object sender, EventArgs e)
{
EventTypeLogic eventTypeLogic = new EventTypeLogic();
int eventTypeID = Convert.ToInt32(Request.QueryString["Id"]);
ddlEventType.DataSource = eventTypeLogic.populateEventTypeDDL();
ddlEventType.DataValueField = "EventTypeID";
ddlEventType.DataTextField = "Name";
ddlEventType.DataBind();
ddlEventType.Items.Insert(0, new ListItem("Select Event Type", "0"));
if (eventTypeID > 0)
{
ddlEventType.SelectedIndex = eventTypeID;
}
}
下拉式aspx代码:
<asp:DropDownList ID="ddlEventType" runat="server" CssClass="span2 form-info" />
如果您希望将
EventName
显示为Ddl
中的预选值,那么只需使用eventTypeId
启动一个查询,并获取该事件的所有信息,然后重试
// i suppose when you fire query you get an Object `EventDetails`
if (eventTypeID > 0)
{
ddlEventType.SelectedIndex = eventTypeID;
ddlEventType.SelectedValue = EventDetails.EventTypeID.ToString();
}
这应该管用
protected void Page_Load(object sender, EventArgs e)
{
EventTypeLogic eventTypeLogic = new EventTypeLogic();
int eventTypeID = Convert.ToInt32(Request.QueryString["Id"]);
string name = eventTypeLogic.resolveToName(eventTypeID);
ddlEventType.DataSource = eventTypeLogic.populateEventTypeDDL();
ddlEventType.DataValueField = "EventTypeID";
ddlEventType.DataTextField = "Name";
ddlEventType.Items.Insert(0, new ListItem("Select Event Type", "0"));
//ddlEventType.DataBind();
ddlEventType.SelectedIndex = eventTypeID;
ddlEventType.DataBind();
}
// i suppose when you fire query you get an Object `EventDetails`
if (eventTypeID > 0)
{
ddlEventType.SelectedIndex = eventTypeID;
ddlEventType.SelectedValue = EventDetails.EventTypeID.ToString();
}