Question

我在DropDownList的标头中有一个GridView，我将其数据绑定在RowDataBound并将其放在UpdatePanel中。我想在选择后保留选定的值（回发）。怎么样？

这里我填写下拉列表

受保护的子gvStaffList_RowDataBound（sender As Object，e As System.Web.UI.WebControls.GridViewRowEventArgs）处理gvStaffList.RowDataBound

If e.Row.RowType = DataControlRowType.Header Then

    ' Fill the header dropdownlist from the datatable and displaying only the unique values (NOT from database directly) 

    ' ============================= Supervisor name ======================================================
    Dim ddlSupervisors As DropDownList = DirectCast(e.Row.FindControl("ddlSupervisors"), DropDownList)
    For x As Integer = 0 To data.Rows.Count - 1
        If ddlSupervisors.Items.FindByValue(data.Rows(x).Item("SuperId")) Is Nothing Then
            ddlSupervisors.Items.Add(New ListItem(data.Rows(x).Item("SuperName"), data.Rows(x).Item("SuperId")))
        End If
    Next
    ddlSupervisors.Items.Insert(0, New ListItem("All", "All"))

    ' ============================= Supervisor name ======================================================
    Dim ddlPostTitle As DropDownList = DirectCast(e.Row.FindControl("ddlPostTitle"), DropDownList)
    For x As Integer = 0 To data.Rows.Count - 1

        If ddlPostTitle.Items.FindByValue(data.Rows(x).Item(1)) Is Nothing Then
            ddlPostTitle.Items.Add(New ListItem(data.Rows(x).Item(1), data.Rows(x).Item(1)))
        End If
    Next
    ddlPostTitle.Items.Insert(0, New ListItem("All", "All"))

Answer 1

您可以在IndexChanged事件期间将其存储在会话中，然后将其拉回。

Answer 2

你好这样使用会话：

Session["selecteditem"] = "your value";

c＃上的

; - ）

Answer 3

尝试在回发后再次重新填充下拉列表，然后在重新填写后再保留选定的下拉列表值。

尝试一下，如果有任何问题请告诉我

如何在下拉列表中保留所选值

3 个答案: