c# - 动态创建的命令按钮不触发命令

Question

我正在为 Umbraco 创建自定义数据类型。这种数据类型只是从数据库中读取记录并将它们呈现在 html 表中，没有重复器。在每一行中，最初有两个按钮，一个用于编辑记录，一个用于删除记录。

单击编辑时，该行将进入编辑模式，其中使用文本框代替文字，按钮不是“编辑”和“删除”，而是“保存”和“取消”。单击这些按钮中的任何一个似乎都不起作用。他们应该发射的命令没有发射。

我读过关于必须在页面加载之前创建这些按钮的内容，我也这样做了。我有每种类型的列表(保存、取消)。那是在Init上生成的，ids是根据记录的ids来的。命令和命令参数也在这里分配。

但是，这些命令似乎仍然没有触发。

代码

public class ProductManagerDataEditor : System.Web.UI.UpdatePanel, umbraco.interfaces.IDataEditor
{
    private umbraco.interfaces.IData _data;

    //Properties
    private List<Record> Records { get; set; }
    private int EditRecordID = 0;

    //Editor Controls
    TextBox tb_EditName;
    TextBox tb_EditPrice;
    Button btn_Add;
    List<Button> EditButtons;
    List<Button> DeleteButtons;
    List<Button> SaveButtons;
    List<Button> CancelButtons;

    /// <summary>
    /// Constructor.
    /// Reads in curent data along with configuration settings for this data type.
    /// </summary>
    /// <param name="Data"></param>
    /// <param name="Configuration"></param>
    public ProductManagerDataEditor(umbraco.interfaces.IData Data, SortedList<String, String> Configuration)
    {
        _data = Data;
    }

    public virtual bool TreatAsRichTextEditor
    {
        get { return false; }
    }
    public bool ShowLabel
    {
        get { return true; }
    }
    public Control Editor { get { return this; } }
    public void Save()
    {

    }

    /// <summary>
    /// On Init Method
    /// </summary>
    protected override void OnInit(EventArgs e)
    {
        base.OnInit(e);
    }

    /// <summary>
    /// On Load Method
    /// </summary>
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
            LoadRecords();
        GenerateControls();
    }

    protected override void Render(HtmlTextWriter writer)
    {
        base.Render(writer);
        RenderTableContents(writer);
    }

    /// <summary>
    /// Generates the buttons to be used
    /// </summary>
    protected void GenerateControls()
    {
        SaveButtons = new List<Button>();
        CancelButtons = new List<Button>();
        DeleteButtons = new List<Button>();
        EditButtons = new List<Button>();

        //Other Buttons
        foreach (Record r in Records)
        {
            //Save Button
            Button btn_Save = new Button();
            btn_Save.CssClass = "btn-save";
            btn_Save.ID = "btnSave_" + r.ID;
            btn_Save.Text = "Save";
            btn_Save.Command += new CommandEventHandler(Save);
            btn_Save.CommandArgument = r.ID.ToString();

            //Cancel Edting Button
            Button btn_Cancel = new Button();
            btn_Cancel.CssClass = "btn-cancel";
            btn_Cancel.ID = "btnCancel";
            btn_Cancel.Text = "Cancel";
            btn_Cancel.Click += new EventHandler(CancelEdit);

            //Delete Button
            Button btn_Del = new Button();
            btn_Del.CssClass = "btn-delete";
            btn_Del.ID = "btnDelete_" + r.ID;
            btn_Del.Text = "Delete";
            btn_Del.Command += new CommandEventHandler(Delete);
            btn_Del.CommandArgument = r.ID.ToString();

            //Edit Button
            Button btn_Edit = new Button();
            btn_Edit.CssClass = "btn-edit";
            btn_Edit.ID = "btnEdit_" + r.ID;
            btn_Edit.Text = "Edit";
            btn_Edit.Command += new CommandEventHandler(EditRecord);
            btn_Edit.CommandArgument = r.ID.ToString();

            SaveButtons.Add(btn_Save);
            CancelButtons.Add(btn_Cancel);
            DeleteButtons.Add(btn_Del);
            EditButtons.Add(btn_Edit);
        }
    }


    /// <summary>
    /// Loads the records from the database
    /// </summary>
    protected void LoadRecords()
    {
        Records = //Loaded from db...
    }


    /// <summary>
    /// Renders The Table of Records
    /// </summary>
    protected void RenderTableContents(HtmlTextWriter w)
    {
        bool editMode = false;

        w.Write("<table class='product-manager' cellspacing='0' cellpadding='3px'>");
        w.Write("<tr class='head'>");
        w.Write("<th>Name</th>");
        w.Write("<th>Price</th>");
        w.Write("<th></th>");
        w.Write("<th></th>");
        w.Write("</tr>");

        int buttonIndex = 0;
        foreach (Record r in Records)
        {
            //If editing this record, display text boxes
            if (EditRecordID == r.ID)
            {
                editMode = true;

                tb_EditName = new TextBox { Text = r.Name };
                tb_EditPrice = new TextBox { Text = r.Price.ToString() };

                w.Write("<tr>");
                    w.Write("<td>");
                    tb_EditName.RenderControl(w);
                    w.Write("</td>");
                    w.Write("<td>");
                    tb_EditPrice.RenderControl(w);
                    w.Write("</td>");
                    w.Write("<td>");
                    SaveButtons[buttonIndex].RenderControl(w);
                    w.Write("</td>");
                    w.Write("<td>");
                    CancelButtons[buttonIndex].RenderControl(w);
                    w.Write("</td>");
                w.Write("</tr>");
            }
            //Not in edit mode
            else
            {
                w.Write("<tr>");
                    w.Write("<td>" + t.Name + "</td>");
                    w.Write("<td>&pound;" + t.Price + "</td>");
                    w.Write("<td>");
                    EditButtons[buttonIndex].RenderControl(w);
                    w.Write("</td>");
                    w.Write("<td>");
                    DeleteButtons[buttonIndex].RenderControl(w);
                    w.Write("</td>");
                w.Write("</tr>");
            }
            buttonIndex++;
        }

        w.Write("</table>");
    }


    #region Events
    /// <summary>
    /// Sets the id of the row to edit
    /// </summary>
    protected void EditRecord(object sender, CommandEventArgs e)
    {
        EditRecordID = e.CommandArgument.ToString();
    }

    /// <summary>
    /// Cancels editing mode
    /// </summary>
    protected void CancelEdit(object sender, EventArgs e)
    {
        EditRecordID = 0;
    }

    /// <summary>
    /// Deletes Selected Record
    /// </summary>
    protected void DeleteRecord(object sender, CommandEventArgs e)
    {
        //TODO
    }

    /// <summary>
    /// Updates Record Details
    /// </summary>
    protected void Save(object sender, CommandEventArgs e)
    {
       //Update the Record
    }
    #endregion

}

Answer 1

我试过你的代码，显然有问题的代码是渲染。 UpdatePanel 根本没有将按钮视为触发器。

解决方案是将控件添加到 asp:Table 中的面板，并让 UpdatePanel 进行渲染，因此跳过渲染代码。

这是您需要更改的内容(这仅用于编辑按钮，但您可以为所有按钮添加代码):

protected void GenerateControls()
{
    var table = new Table();
    var headerRow = new TableHeaderRow();
    var headerCell = new TableHeaderCell();
    headerCell.Text = "Name";
    headerRow.Cells.Add(headerCell);
    headerCell = new TableHeaderCell();
    headerCell.Text = "Price";
    headerRow.Cells.Add(headerCell);
    headerCell = new TableHeaderCell();
    headerRow.Cells.Add(headerCell);
    headerCell = new TableHeaderCell();
    headerRow.Cells.Add(headerCell);
    table.Rows.Add(headerRow);

    //Other Buttons
    foreach (Record r in Records)
    {
        var row = new TableRow();

        var cell = new TableCell();
        //Edit Button
        Button btn_Edit = new Button();
        btn_Edit.CssClass = "btn-edit";
        btn_Edit.ID = "btnEdit_" + r.ID;
        btn_Edit.Text = "Edit";
        btn_Edit.Command += new CommandEventHandler(EditRecord);
        btn_Edit.CommandArgument = r.ID.ToString();
        cell.Controls.Add(btn_Edit);
        row.Cells.Add(cell);
        table.Rows.Add(row);
    }

    ContentTemplateContainer.Controls.Add(table);
}

顺便说一句，这看起来像一个网格。为什么不使用 GridView 或 ListView？