搜索后排序-gridview1觸發了未處理的事件排序

Question

基本上，我最近在asp.net網站上添加了一個搜索框和一個按鈕。 我現在遇到的問題是，即使搜索是干凈的並且可以正常工作，但在運行任何搜索之前和之后都存在排序方面的問題。 我覺得sda（Fill）.dt之后可能會丟失一些東西，但是我在網上發現的任何內容似乎都無濟於事。 在vb中也無濟於事。 提前致謝。

Imports System
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.OleDb
Imports System.Collections
Imports System.Collections.Generic
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports Microsoft.VisualBasic
Public Class ShowPOsAdmin
    Inherits System.Web.UI.Page
    Dim strConn As String = ConfigurationManager.ConnectionStrings("PurchaseOrderConnectionString").ConnectionString
    Dim Connection As SqlConnection = New SqlConnection(strConn)
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Me.IsPostBack Then
            Me.SearchVen()
        End If
    End Sub
    Private Sub SearchVen()
        Dim Constr As String = ConfigurationManager.ConnectionStrings("PurchaseOrderConnectionString").ConnectionString
        Using Con As New SqlConnection(Constr)
            Using cmd As New SqlCommand
                Dim searchword As String = "SELECT PurchaseOrder.PoId, PurchaseOrder.Vendor_Name, PurchaseOrder.POAmount,PurchaseOrder.DateFrom, PurchaseOrder.DateTo, PurchaseOrder.Balance, PurchaseOrder.CodeId, PurchaseOrder.PoNumber, BPNumber, ClassCode.CodeId AS Expr1, ClassCode.CodeDefinition, PurchaseOrder.Notes FROM PurchaseOrder INNER JOIN ClassCode ON PurchaseOrder.CodeId = ClassCode.CodeId"
                If Not String.IsNullOrEmpty(TextBox11.Text.Trim()) Then
                    searchword += " Where PurchaseOrder.PONumber Like @POnumber + '%'"
                    cmd.Parameters.AddWithValue("PONumber", TextBox11.Text.Trim())
                End If
                cmd.CommandText = searchword
                cmd.Connection = Connection
                Using sda As New SqlDataAdapter(cmd)
                    Dim dt As New DataTable()
                    sda.Fill(dt)
                    dt.DefaultView.Sort = "Vendor_Name ASC"
                    GridView1.DataSourceID = ""
                    GridView1.DataSource = dt
                    GridView1.DataBind()
                    ViewState("dt") = dt
                End Using
            End Using
        End Using
    End Sub
    Private Sub DetailsView1_ItemDeleted(sender As Object, e As DetailsViewDeletedEventArgs) Handles DetailsView1.ItemDeleted
        GridView1.DataBind()
        Me.SearchVen()
    End Sub

    Private Sub DetailsView1_ItemInserted(sender As Object, e As DetailsViewInsertedEventArgs) Handles DetailsView1.ItemInserted
        GridView1.DataBind()
        Me.SearchVen()
    End Sub
    Private Sub DetailsView1_ItemUpdated(sender As Object, e As DetailsViewUpdatedEventArgs) Handles DetailsView1.ItemUpdated
        GridView1.DataBind()
        Me.SearchVen()
    End Sub
    Private Sub GridView1_PageIndexChanging(sender As Object, e As GridViewPageEventArgs) Handles GridView1.PageIndexChanging
        GridView1.PageIndex = e.NewPageIndex
        Me.SearchVen()
    End Sub
    Protected Sub TextBox11_TextChanged(sender As Object, e As EventArgs) Handles TextBox11.TextChanged
        Me.SearchVen()
    End Sub
    Protected Sub DetailsView1_PageIndexChanging(sender As Object, e As DetailsViewPageEventArgs) Handles DetailsView1.PageIndexChanging
    End Sub
End Class

Answer 1

這可以幫助您。

訣竅是永遠不要依賴DataTable中記錄的順序。 對DataTable使用DataView，然后綁定到DataView。

Imports System.Data.SqlClient
Imports System.Data

Partial Class PageInitTest
    Inherits System.Web.UI.Page

    Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init

        If Not IsPostBack Then

            Dim conn As New SqlConnection("myconnectionstring")
            Dim command As New SqlCommand("mySQL", conn)
            Dim da As New SqlDataAdapter(command)
            Dim tblData As New DataTable
            da.Fill(tblData)

            ' now the sorting
            Dim dv As New DataView(tblData)

            ' you can also do filtering to not show all of them
            'dv.RowFilter = "MyField = 1"

            dv.Sort = "MyField ASC"    ' ASC or DESC

            ' then bind the control to the DataView, not the DataTable
            dgdMyData.DataSource = dv
            dgdMyData.DataBind()

            conn.Close()

        End If

    End Sub

End Class

鏈接中的示例：

https://forums.asp.net/t/1063235.aspx?Table+Adapter+problem+with+sort+order

Answer 2

當您單擊Vendor_Name時，應排在該列的第一位或最后一位。 問題是由於搜索，實際上並沒有這樣做。 從您單擊標題之一（如供應商名稱或日期）的那一刻起，您就會收到該錯誤消息。