从一个来源绑定多个下拉列表答案

【问题标题】：Binding multible dropdown lists from one source从一个来源绑定多个下拉列表
【发布时间】：2017-04-19 17:36:47
【问题描述】：

我有多个下拉列表要填充相同的项目。

以下代码将仅填充代码中的第一个 DropDownList (DropDownList1)，不会填充其他任何一个。为了测试，我将“DropDownList3”移到代码中的第一个位置，看看会发生什么，然后只有“DropDownList3”填充了正确的数据。我需要做什么才能让所有数据都填充相同的数据？

con.Open()
cmd1 = New SqlCommand(SqlQuery & SqlQuery2, con)
dr1 = cmd1.ExecuteReader

DropDownList1.DataSource = dr1
DropDownList1.DataTextField = "FullInfo"
DropDownList1.DataValueField = "FullInfo"
DropDownList1.DataBind()

DropDownList3.DataSource = dr1
DropDownList3.DataTextField = "FullInfo"
DropDownList3.DataValueField = "FullInfo"
DropDownList3.DataBind()

DropDownList4.DataSource = dr1
DropDownList4.DataTextField = "FullInfo"
DropDownList4.DataValueField = "FullInfo"
DropDownList4.DataBind()

DropDownList5.DataSource = dr1
DropDownList5.DataTextField = "FullInfo"
DropDownList5.DataValueField = "FullInfo"
DropDownList5.DataBind()

DropDownList6.DataSource = dr1
DropDownList6.DataTextField = "FullInfo"
DropDownList6.DataValueField = "FullInfo"
DropDownList6.DataBind()

DropDownList7.DataSource = dr1
DropDownList7.DataTextField = "FullInfo"
DropDownList7.DataValueField = "FullInfo"
DropDownList7.DataBind()
con.Close()

【问题讨论】：

标签： mysql sql asp.net vb.net

【解决方案1】：

您可以填写 DataTable 并将其用作来源。

Dim dt As DataTable = New DataTable

Dim connection As SqlConnection = New SqlConnection(connStr)
Dim adapter As SqlDataAdapter = New SqlDataAdapter(SqlQuery & SqlQuery2, connection)

adapter.Fill(dt)

DropDownList1.DataSource = dt
DropDownList2.DataSource = dt

【讨论】：

谢谢，您的回答让我找到了正确的地方。谢谢！！

【解决方案2】：

private sub BindDrops(byRef drop as dropdownlist, byval text as string, byval value as string)

    con.Open()
    cmd1 = New SqlCommand(SqlQuery & SqlQuery2, con)
    dr1 = cmd1.ExecuteReader
    con.close()

    drop.DataSource = dr1
    drop.DataTextField = text
    drop.DataValueField = value
    drop.databind()
    end sub

查询需要返回一个文本和一个值： IE： query = "SELECT ID_FIELD, NAME_FIELD FROM..."

BindDrops(DropDownList1, "NAME_FIELD","ID_FIELD")
BindDrops(DropDownList2, "NAME_FIELD","ID_FIELD")
...
BindDrops(DropDownListN, "NAME_FIELD","ID_FIELD")

【讨论】：