グリッドビューとドロップダウンリストで少し問題が発生しています。ドロップダウンリストを最初にロードすることはできますが、自動ポストバックすると値なしで返されます。RowEditingサブのドロップダウンリストにデータを入力しています。RowDataBoundサブで何らかの方法で再バインドする必要があると思いますが、その方法がわかりません。コントロールのSelectedValueを見つけようとすると、何も表示されません。
VBコード
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
bindGridView()
End If
End Sub
'Menu Click
'bindGridView
Public Sub bindGridView(Optional ByVal sortExp As String = "", Optional ByVal sortDir As String = "")
Dim strConnString As String = ConfigurationManager.ConnectionStrings("WEBConnectionString").ConnectionString
Dim conn As SqlConnection = New SqlConnection(strConnString)
conn.Open()
Dim strProgramNumber As String = 5
Dim strRecordType As String = "Input Source"
Dim strProgramInformation As String = "\\path\to\file"
Dim sql As String
Dim cmd As SqlCommand = New SqlCommand()
cmd.Connection = conn
If sortExp <> String.Empty Then
sortExp = (sortExp & " " & sortDir).ToString
sql = "SELECT tblPrgTrackPrograms.ProgramNumber, " & _
"tblPrgTrackPrograms.ProgramName, " & _
"tblPrgTrackPrograms.ProgramStatus, " & _
"tblPrgTrackProgramDocumentation.RecordType, " & _
"tblPrgTrackProgramDocumentation.ProgramInformation " & _
"FROM tblPrgTrackPrograms INNER JOIN tblPrgTrackProgramDocumentation ON " & _
"tblPrgTrackPrograms.ProgramNumber = tblPrgTrackProgramDocumentation.ProgramNumber ORDER BY " & _
"@sortExp"
cmd.Parameters.AddWithValue("sortExp", sortExp)
Else
sql = "SELECT tblPrgTrackPrograms.ProgramNumber, " & _
"tblPrgTrackPrograms.ProgramName, " & _
"tblPrgTrackPrograms.ProgramStatus, " & _
"tblPrgTrackProgramDocumentation.RecordType, " & _
"tblPrgTrackProgramDocumentation.ProgramInformation " & _
"FROM tblPrgTrackPrograms INNER JOIN tblPrgTrackProgramDocumentation ON " & _
"tblPrgTrackPrograms.ProgramNumber = tblPrgTrackProgramDocumentation.ProgramNumber"
End If
cmd.CommandText = sql
Dim myDataSet As New DataSet()
Dim mySQLAdapter As New SqlDataAdapter(cmd)
mySQLAdapter.SelectCommand.Connection = conn
mySQLAdapter.Fill(myDataSet)
conn.Close()
gvProgramDetails.DataSource = myDataSet
gvProgramDetails.DataBind()
End Sub
'ProgramDetails Load
Protected Sub gvProgramDetails_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles gvProgramDetails.Load
bindGridView()
End Sub
'ProgramDetails Paging
Protected Sub gvProgramDetails_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles gvProgramDetails.PageIndexChanging
gvProgramDetails.PageIndex = e.NewPageIndex
bindGridView()
End Sub
'ProgramDetails Sorting
Protected Sub gvProgramDetails_Sorting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewSortEventArgs) Handles gvProgramDetails.Sorting
Dim SortDirection As String
If Session("SortDirection") = vbNullString Then
Session("SortDirection") = "DESC"
Else
SortDirection = Session("SortDirection").ToString
If SortDirection = "ASC" Then
SortDirection = "DESC"
ElseIf SortDirection = "DESC" Then
SortDirection = "ASC"
Else
SortDirection = "ASC"
End If
bindGridView(e.SortExpression, Session("SortDirection"))
'Need to store sort info in view state
Session("SortDirection") = SortDirection
End If
End Sub
'ProgramDetails RowEditing
Protected Sub gvProgramDetails_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles gvProgramDetails.RowEditing
Dim lbl As Label = CType(gvProgramDetails.Rows(e.NewEditIndex).FindControl("lblRecordType"), Label)
Dim strValue As String = lbl.Text
gvProgramDetails.EditIndex = e.NewEditIndex
bindGridView()
Dim row As GridViewRow = gvProgramDetails.Rows(e.NewEditIndex)
Dim strConnString As String = ConfigurationManager.ConnectionStrings("CSPaperWEBConnectionString").ConnectionString
Dim ddlRecordType As DropDownList = CType(row.FindControl("ddlRecordType"), DropDownList)
Dim conn As SqlConnection = New SqlConnection(strConnString)
conn.Open()
Dim sql As String
Dim cmd As SqlCommand = New SqlCommand()
cmd.Connection = conn
sql = "select RecordType from [tblPrgTrackValidRecordTypes] "
cmd.CommandText = sql
Dim myDataSet As New DataSet()
Dim mySQLAdapter As New SqlDataAdapter(cmd)
mySQLAdapter.SelectCommand.Connection = conn
mySQLAdapter.Fill(myDataSet)
conn.Close()
If ddlRecordType IsNot Nothing Then
ddlRecordType.DataTextField = "RecordType"
ddlRecordType.DataValueField = "RecordType"
ddlRecordType.DataSource = myDataSet
ddlRecordType.SelectedValue = strValue
ddlRecordType.DataBind()
End If
End Sub
Protected Sub gvProgramDetails_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvProgramDetails.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim ctrl As Control = e.Row.FindControl("ddlRecordType")
If ctrl IsNot Nothing Then
Dim ddlRecordType As DropDownList = ctrl
MsgBox(ddlRecordType.SelectedValue)
End If
End If
End Sub
'ProgramDetails RowUpdating
Protected Sub gvProgramDetails_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles gvProgramDetails.RowUpdating
Dim ddlRecordType As DropDownList = gvProgramDetails.Rows(e.RowIndex).FindControl("ddlRecordType")
MsgBox(ddlRecordType.SelectedValue)
gvProgramDetails.EditIndex = -1
bindGridView()
End Sub
'ProgramDetails RowCancelingEdit
Protected Sub gvProgramDetails_RowCancelingEdit1(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCancelEditEventArgs) Handles gvProgramDetails.RowCancelingEdit
gvProgramDetails.EditIndex = -1
bindGridView()
End Sub
'ProgramDetails RowDeleting
Protected Sub gvProgramDetails_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles gvProgramDetails.RowDeleting
Dim strConnString As String = ConfigurationManager.ConnectionStrings("WEBConnectionString").ConnectionString
Dim conn As SqlConnection = New SqlConnection(strConnString)
conn.Open()
Dim strProgramNumber As String = 5
Dim strRecordType As String = "Input Source"
Dim strProgramInformation As String = "\\path\to\file"
Dim sql As String = "delete from tblPrgTrackProgramDocumentation where ProgramNumber = @ProgramNumber and RecordType = @RecordType and ProgramInformation = @ProgramInformation"
Dim cmd As SqlCommand = New SqlCommand()
cmd.Connection = conn
cmd.CommandText = sql
cmd.Parameters.AddWithValue("ProgramNumber", strProgramNumber)
cmd.Parameters.AddWithValue("RecordType", strRecordType)
cmd.Parameters.AddWithValue("ProgramInformation", strProgramInformation)
cmd.ExecuteNonQuery()
cmd.Dispose()
bindGridView()
End Sub
ASPフロントエンド
<ajx:UpdatePanel ID="ajaxpanel" runat="server">
<ContentTemplate>
<asp:GridView ID="gvProgramDetails" runat="server" AutoGenerateColumns="False"
CssClass="gridview" DataKeyNames="ProgramNumber" AllowPaging="True" PageSize="3" AllowSorting="True" >
<Columns>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False"
CommandName="Delete" Text="Delete" OnClientClick="return confirm('Are you sure you want to delete this record');"></asp:LinkButton>
</ItemTemplate>
<EditItemTemplate>
</EditItemTemplate>
<ControlStyle CssClass="button delete" />
</asp:TemplateField>
<asp:CommandField ControlStyle-CssClass="button save" ShowEditButton="True">
<ControlStyle CssClass="button save" />
</asp:CommandField>
<asp:BoundField DataField="ProgramNumber" HeaderText="ProgramNumber"
InsertVisible="False" ReadOnly="True" SortExpression="ProgramNumber" />
<asp:BoundField DataField="ProgramName" HeaderText="ProgramName" ReadOnly="True"
SortExpression="ProgramName" />
<asp:BoundField DataField="ProgramStatus" HeaderText="ProgramStatus" ReadOnly="True"
SortExpression="ProgramStatus" />
<asp:TemplateField HeaderText="RecordType" SortExpression="RecordType">
<EditItemTemplate>
<asp:DropDownList ID="ddlRecordType" runat="server" autopostback="True">
</asp:DropDownList>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="lblRecordType" runat="server" Text='<%# Bind("RecordType") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="ProgramInformation" HeaderText="ProgramInformation"
SortExpression="ProgramInformation" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:WEBConnectionString %>"
SelectCommand="SELECT * FROM [tblPrgTrackValidRecordTypes]"></asp:SqlDataSource>
</ContentTemplate>
</ajx:UpdatePanel>
ツールボックスからコントロールをドラッグインし、データソースを作成し、bind( "RecordType")を設定すると答えた方は、しないでください。私はそれをそのように試しましたが、値は常にレコードタイプが何であれポストバックされます。したがって、このグリッドビューのそのバージョンを解決できる場合を除いて、ドラッグ/ドロップ制御ソリューションを使用しないでください。私はこれを解決するために私の脳を引っ掻いています。
アップデート
App_Code Process/ddlRecordType.vbで作成しました
Imports Microsoft.VisualBasic
Namespace processes.ProgramTrack.dllRecordType
Public Class ddlRecordType
Public Sub ddlRecordType()
End Sub
Public Function GetRecords() As DataSet
Dim conn As New SqlConnection
Dim cmd As New SqlCommand
conn.ConnectionString = ConfigurationManager.ConnectionStrings("WEBConnectionString").ConnectionString.ToString
cmd.CommandText = "select RecordType from [tblPrgTrackValidRecordTypes] "
cmd.Connection = conn
Dim myDataSet As New DataSet()
Dim mySQLAdapter As New SqlDataAdapter(cmd)
mySQLAdapter.Fill(myDataSet)
Return myDataSet
End Function
End Class
End Namespace
マークアップは次のようになります。
<asp:DropDownList ID="ddlRecordType" DatasourceID="odsRecordType" DataTextField="RecordType" DataValueField="RecordType" runat="server" autopostback="True" > </asp:DropDownList>
<asp:ObjectDataSource ID="odsRecordType" runat="server" TypeName="processes.ProgramTrack.dllRecordType.ddlRecordType" SelectMethod="GetRecords"></asp:ObjectDataSource>
次に、DDLがポストバックでその値を維持しないことについて以前と同じ問題が発生します。新しい質問を開始する必要がありますか、それともこの質問を続行する必要がありますか?
更新して、DDLが維持されない問題を修正します。グリッドビューのビューステートを無効にします。
<asp:GridView ID="gvProgramDetails" runat="server" AutoGenerateColumns="False" CssClass="gridview"DataKeyNames="ProgramNumber" AllowPaging="True" PageSize="10" EnableViewState="False" AllowSorting="True">