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c# - Telerik：无法将下拉列表的选定值添加到自动生成的 Radgrid

问题描述

我在后面的代码中向自动生成的 RadGrid 添加了一个下拉列表，但是，当行更新时，我无法获取选定的值。我添加下拉列表如下：

protected void grdAssetImport_ItemDataBound(object sender, GridItemEventArgs e)
{
    if (e.Item is GridEditableItem && e.Item.IsInEditMode)
    {
        GridEditableItem edit = (GridEditableItem)e.Item;

        TextBox txt = (TextBox)edit["AssetTypeName"].Controls[0];
        txt.Visible = false;
        DropDownList rddl = new DropDownList();
        PortalView.LookupListBO list = LookupListBA.LookupList_GetByKey(DB_Context, "SITE_ASSETTYPE_LIST", UtilityBA.IsActiveChoice.Active);
        List<PortalView.LookupListItemBO> oList = LookupListBA.LookupListItem_GetList_ByLookupListId(DB_Context, list.LookupListId, (Guid)Current.Employee.SiteId);
        var AssetList = oList.Select(l => new { AssetTypeName = l.Name });
        rddl.ID = "ddlAssetTypeName";

        rddl.AutoPostBack = false;
        rddl.DataSource = AssetList;
        rddl.DataTextField = "AssetTypeName";
        rddl.DataValueField = "AssetTypeName";
        rddl.DataBind();

        edit["AssetTypeName"].Controls.Add(rddl);
    }
}

我尝试在 UpdateCommand 中检索选定的值，但没有成功：

protected void grdAssetImport_UpdateCommand(object sender, GridCommandEventArgs e)
{
    GridEditableItem editedItem = e.Item as GridEditableItem;
    GridEditManager editMan = editedItem.EditManager;
    foreach (GridColumn column in e.Item.OwnerTableView.RenderColumns)
{
    GridEditableItem editableItem = e.Item as GridEditableItem;
    DropDownList ddl = editableItem.FindControl("ddlAssetTypeName") as DropDownList;
    if(ddl != null)
    {
        string assetType = ddl.SelectedValue;

    }

        DropDownList ddl2 = editableItem["AssetTypeName"].Controls[0] as DropDownList;
        if(ddl2 != null)
        {
            string assetType = ddl.SelectedValue;
        }


    if (column is IGridEditableColumn)
    {
        IGridEditableColumn editableCol = (column as IGridEditableColumn);
        if (editableCol.IsEditable)
        {
            IGridColumnEditor editor = editMan.GetColumnEditor(editableCol);
            string editorText = "unknown";
            object editorValue = null;
            if (editor is GridTextColumnEditor)
            {
                editorText = (editor as GridTextColumnEditor).Text;
                editorValue = (editor as GridTextColumnEditor).Text;
            }
            if (editor is GridBoolColumnEditor)
            {
                editorText = (editor as GridBoolColumnEditor).Value.ToString();
                editorValue = (editor as GridBoolColumnEditor).Value;
            }
            if (editor is GridDropDownColumnEditor)
            {
                editorText = (editor as GridDropDownColumnEditor).SelectedText + "; " +
                 (editor as GridDropDownColumnEditor).SelectedValue;
                editorValue = (editor as GridDropDownColumnEditor).SelectedValue;
            }
            try
            {
                DataRow[] changedRows = this.AssetGridDataSource.Select("Id = " + editedItem.OwnerTableView.DataKeyValues[editedItem.ItemIndex]["Id"].ToString());
                changedRows[0][column.UniqueName] = editorValue;
                this.AssetGridDataSource.AcceptChanges();
                GetSearchColumns();
            }
            catch (Exception ex)
            {
                // Label1.Text = "<strong>Unable to set value of column '" + column.UniqueName + "'</strong> - " + ex.Message;
                e.Canceled = true;
                break;
            }
        }
    }
}

}

它永远不会找到下拉列表，并且总是只看到列的 GridTextColumnEditor 所以我得到的唯一值是编辑模式之前的原始值。

非常感谢任何帮助！

标签： c#telerik-grid

解决方案

项目不会每次都绑定，因此 ItemDataBound 事件的触发次数比您想象的要少。要在每次创建项目时添加控件，您需要改用 ItemCreated 事件。

我已经测试了以下并且有效。

protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
{
    if (e.Item.IsInEditMode)
    {
        GridEditableItem edititem = e.Item as GridEditableItem;

        DropDownList rddl = new DropDownList();

        edititem["AssetTypeName"].Controls[0].Visible = false;

        rddl.ID = "ddlAssetTypeName";

        rddl.AutoPostBack = false;
        rddl.DataSource = Enumerable.Range(1, 3).Select(x => "Item" + x).ToList();
        rddl.DataBind();

        edititem["AssetTypeName"].Controls.Add(rddl);
    }
}

protected void RadGrid1_UpdateCommand(object sender, GridCommandEventArgs e)
{
    GridEditableItem editedItem = e.Item as GridEditableItem;

    DropDownList ddl = editedItem["AssetTypeName"].FindControl("ddlAssetTypeName") as DropDownList;

    string selectedValue = ddl.SelectedValue;
}

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