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我的应用程序由一个 GridView 组成，它包含一个下拉列表控件和一个文本框控件。正在尝试什么：当用户从下拉列表中选择一个项目时，文本框控件将填充项目描述。我可以通过以下代码完成任务：

Protected Sub ddlStartPartDescrip_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
        Dim ddlStartPartDescrip As String = DirectCast(gvPartDetailDescription.Controls(0).Controls(0).FindControl("ddlStartPartDescrip"), DropDownList).Text

        Dim myConnectionStringIII As String = ConfigurationManager.ConnectionStrings("ShipperNotificationConnectionString").ConnectionString.ToString
        Dim myConnectionIII As New SqlConnection(myConnectionStringIII)
        myConnectionIII.Open()

        Dim mySQLQueryIII As String = "SELECT Part_Name, Part_Desc FROM Part WHERE Part_Name='" + ddlStartPartDescrip.ToString() + "'" + "ORDER BY Part_Name"
        Dim myCommandIII As New SqlCommand(mySQLQueryIII, myConnectionIII)


        Dim myReaderIII As SqlDataReader = myCommandIII.ExecuteReader()

        While (myReaderIII.Read())
            'the orginal code 
            Dim row As GridViewRow = DirectCast(DirectCast(sender, DropDownList).NamingContainer, GridViewRow)
            Dim txtStartPartDescripNum As TextBox = DirectCast(row.FindControl("txtStartPartDescripNum"), TextBox)
            txtStartPartDescripNum.Text = myReaderIII.GetValue(1).ToString
        End While
        myReaderIII.Close()
        myConnectionIII.Close() 
End Sub

...但是，我正在尝试通过存储过程完成相同的任务来完成相同的任务。我的问题是，当从下拉列表中选择列表项时，文本框控件不呈现任何描述。

这是我的存储过程：

USE [DatabaseName]
GO

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[Part_Name_Descript]
(
    @ddlStartPartDescrip varchar(250)

)
AS
Begin
    SELECT Part_Name, Part_Desc FROM Part WHERE Part_Name='" + @ddlStartPartDescrip + "' 
END

这是后面的代码，就像我对非存储过程方法所做的那样，它位于 ddlStartPartDesrip_SelectedIndexChanged 内：

Dim con As New SqlConnection(GetConnectionString())
        'open connection
        con.Open()

        Dim cmd As New SqlCommand("Part_Name_Descript", con)
        cmd.CommandType = CommandType.StoredProcedure

        Dim p1 As New SqlParameter("@ddlStartPartDescrip", ddlStartPartDescrip)

        cmd.Parameters.Add(p1)

        Dim rd As SqlDataReader = cmd.ExecuteReader()

        While (rd.Read())
            Dim row As GridViewRow = DirectCast(DirectCast(sender, DropDownList).NamingContainer, GridViewRow)
            Dim txtStartPartDescripNum As TextBox = DirectCast(row.FindControl("txtStartPartDescripNum"), TextBox)
            txtStartPartDescripNum.Text = rd.GetValue(1).ToString
        End While

        con.Close()

...关于我错过了什么/做错了什么，我能得到一些帮助吗？提前致谢

4

1 回答 1

1

您的查询

SELECT Part_Name, Part_Desc FROM Part WHERE Part_Name='" + @ddlStartPartDescrip + "'

正在寻找 a Part_Namewhich 是文字字符串"@ddlStartPartDescrip"。你需要使用

SELECT Part_Name, Part_Desc FROM Part WHERE Part_Name = @ddlStartPartDescrip

编辑：顺便说一句，你已经有了Part_Name，所以选择它可能是多余的。

于 2013-10-01T17:38:09.140 回答