Question

我在这里看了很多类似的问题，但无济于事。

所以这里......

我正在创建一组用户控件，用于显示类似网格的表列表。无论如何，目标是列出网格，弄乱每个网格数据（客户端）并按保存。网格效果很好，但是当我按下保存时，在VIEWER中的转发器总是空的。任何帮助表示赞赏！

基本布局就像这样

PAGE
...的UpdatePanel
...... usercontrolVIEWER
......... saveBUTTON
......... repeaterCONTROL
............ usercontrolGRID
............ usercontrolGRID
............ ETC！

PAGE看起来像这样

<asp:Content ID="Content2" ContentPlaceHolderID="body" runat="server">
    <asp:UpdatePanel id="udPanel" UpdateMode="Always" runat="server">
            <Triggers>
            </Triggers>
            <ContentTemplate>
               <uc:CommitImporterView ID="civData" runat="server" />
            </ContentTemplate>
    </asp:UpdatePanel>
</asp:Content>

public partial class CommitsAndActualsImporter : BaseForm
{
    #region EVENTS

    protected void Page_Init(object sender, EventArgs e)
    {
        setUpEventHandlers();

        if (!IsPostBack)
            initalize();
    }
    protected void Page_Load(object sender, EventArgs e)
    {
    }

    protected void myListOfGroups_DataBinding(object sender, EventArgs e)
    {
        //.. Code to bind the list goes here ...

        myListOfGroups.SelectedIndex = setSelectedIndex(collection);
    }
    protected void myListOfGroups_SelectedIndexChanged(object sender, EventArgs e)
    {
        myGroup = myListOfGroups.Find(selectedItem => selectedItem.Key == key);
        dataSource = buildViewDataSource(base.ProjectKey, base.AsOf, myGroup.FcrGroupKey, myGroup.ContractorKey, myGroup.WbsKey);

        civData.AsOf = base.AsOf;
        civData.ProjectKey = base.ProjectKey;
        civData.DataSource = dataSource;
        civData.DataBind();
    }

    #endregion

    #region METHODS

    private void initalize()
    {
        ContractorInviteItems dataSource = listGroups(ProjectKey, AsOf);
        myListOfGroups.DataSource = dataSource;
        myListOfGroups.DataBind();
    }
    private void setUpEvents()
    {
        myListOfGroups.DataBinding += new EventHandler(myListOfGroups_DataBinding);
        myListOfGroups.SelectedIndexChanged += new EventHandler(myListOfGroups_SelectedIndexChanged);
    }

    #endregion
}

VIEWER用户控件看起来像这样

<%@ Register Src="~/UserControls/CommitImporterGrid.ascx" TagName="CommitImporterGrid" TagPrefix="uc" %>

<asp:Button ID="btnSave" runat="server" Text="Save" />

<asp:HiddenField ID="hidAsOf" runat="server" Value="" />
<asp:HiddenField ID="hidProjectKey" runat="server" Value="0" />

<asp:Repeater ID="repCommitImporterView" runat="server">
    <ItemTemplate>
        <uc:CommitImporterGrid runat="server" />
    </ItemTemplate>
</asp:Repeater>

public partial class CommitImporterView : System.Web.UI.UserControl
{
    #region PROPERTIES & FIELDS

    private enum basisUsed
    {
        Dollars,
        Hours,
        IsInvalid
    }

    public Object DataSource { get; set; }

    public DateTime AsOf { get { return Convert.ToDateTime(hidAsOf.Value); } set { hidAsOf.Value = value.ToString(); } }
    public Int32 ProjectKey { get { return Convert.ToInt32(hidProjectKey.Value); } set { hidProjectKey.Value = value.ToString(); } }

    #endregion

    #region EVENTS

    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
        setupEvents();
    }
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        this.DataBind();
    }
    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
    }

    public override void DataBind()
    {
        base.DataBind();
    }

    protected void btnSave_Click(object sender, EventArgs e)
    {
        Int32 count = repCommitImporterView.Controls.Count;

        foreach (Control control in repCommitImporterView.Controls)
        {
            if (control is UserControls.CommitImporterGrid)
            {
                string stop = "";
            }

        }
    }

    protected void repCommitImporterView_DataBinding(object sender, EventArgs e)
    {
        if (DataSource == null)
            return;

        if (!IsPostBack)
        {
            Decimal totalSummaryCbudDollars = 0;
            Decimal totalSummaryCbudHours = 0;

            if (summaryValuesExist(out totalSummaryCbudDollars, out totalSummaryCbudHours))
                alignSummarizedRecords(totalSummaryCbudDollars, totalSummaryCbudHours);

            repCommitImporterView.DataSource = DataSource;
        }
    }
    protected void repCommitImporterView_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        ContractorInviteCommitsAndActualsImport record = (ContractorInviteCommitsAndActualsImport)e.Item.DataItem;
        CommitImporterGrid grid = new CommitImporterGrid();
        grid = (UserControls.CommitImporterGrid)Page.LoadControl("~/UserControls/CommitImporterGrid.ascx") as UserControls.CommitImporterGrid;

        grid.AsOf = this.AsOf;
        grid.ProjectKey = this.ProjectKey;

        grid.DataSource = getDataSource(record);
        grid.DataBind();

        repCommitImporterView.Controls.Add(grid);
    }

    #endregion

    #region METHODS

    private void setupEvents()
    {
        btnSave.Click += new EventHandler(btnSave_Click);

        repCommitImporterView.DataBinding += new EventHandler(repCommitImporterView_DataBinding);
        repCommitImporterView.ItemDataBound += new RepeaterItemEventHandler(repCommitImporterView_ItemDataBound);
    }

    #endregion
}

GRID用户控件看起来像

Answer 1

当用户更改DropDownList时，您似乎只绑定了Viewer控件，并且在页面/控件加载时，无论是在初始加载还是在回发时，它都没有被绑定。如果你没有在回发时绑定转发器，它将没有你期望的任何数据项。

我会将myListOfGroups_SelectedIndexChanged的内容提取到私有方法中，然后从myListOfGroups_SelectedIndexChanged调用它，然后从Page_Load调用它，而不管IsPostBack的状态如何（确保在数据绑定myListOfGroups之后调用它。当你从Page_Load调用它时，它将从DropDownList中获取用户的选择并重新绑定绑定Repeater的Viewer控件。

这里的关键点是，无论IsPostBack的值如何，您始终需要在每个页面加载时绑定转发器。否则转发器中什么都没有。

我的用户控件中的Repeater在回发时为空

1 个答案: