Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim arrValues As New ArrayList(6)
arrValues.Add("11")
arrValues.Add("22")
arrValues.Add("33")
arrValues.Add("44")
arrValues.Add("55")
arrValues.Add("66") 'bind the ArrayList to the DataList control
DropDownList1.DataSource = arrValues
DropDownList1.DataBind() End Sub改成 Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Not IsPostBack
Dim arrValues As New ArrayList(6)
arrValues.Add("11")
arrValues.Add("22")
arrValues.Add("33")
arrValues.Add("44")
arrValues.Add("55")
arrValues.Add("66") 'bind the ArrayList to the DataList control
DropDownList1.DataSource = arrValues
DropDownList1.DataBind()
End If
End Sub
Dim arrValues As New ArrayList(6)
arrValues.Add("11")
arrValues.Add("22")
arrValues.Add("33")
arrValues.Add("44")
arrValues.Add("55")
arrValues.Add("66") 'bind the ArrayList to the DataList control
DropDownList1.DataSource = arrValues
DropDownList1.DataBind() End Sub改成 Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
If Not IsPostBack
Dim arrValues As New ArrayList(6)
arrValues.Add("11")
arrValues.Add("22")
arrValues.Add("33")
arrValues.Add("44")
arrValues.Add("55")
arrValues.Add("66") 'bind the ArrayList to the DataList control
DropDownList1.DataSource = arrValues
DropDownList1.DataBind()
End If
End Sub
谢谢两位的鼎力帮助!虽然LATAHU解答的不是很准确!
ispostback属性究竟是什么含义?
Public ReadOnly Property IsPostBack As Boolean
[C#]
public bool IsPostBack {get;}
[C++]
public: __property bool get_IsPostBack();
[JScript]
public function get IsPostBack() : Boolean;
属性值
如果是为响应客户端回发而加载该页,则为 true;否则为 false。
那象dropdownlist1的改变不属于“为了响应客户端回发而加载该页"么?