Question

创建自定义控件这是第一个控制代码

1。 StartScreen.cs和ActDesc.cs控件。

第一次加载页面时，我看到两个编辑按钮。
我点击其中任何一个，看到包含内容的文本框。
然后我点击保存未触发保存按钮事件。
在我看来，在初始CreateChildControls期间创建的控件会触发事件。在Postback上创建的那个不会触发事件。
我在编辑按钮的Command事件处理程序上调用ControlsCreate（）方法。我也尝试过使用EnsureChildControls（）调用。仍然没用？

任何人都可以指导我实现这个目标吗？

。

public class Wrapper
{
    public string Name { get; set; }
    public string Description { get; set; }
}
namespace Cons
{
    public class StartScreen : CompositeControl
    {
        public StartScreen()
        {
            //
            // TODO: Add constructor logic here
            //
        }
        protected override void CreateChildControls()
        {
            List<Wrapper> list = new List<Wrapper>();
            for (int i = 0; i < 2; i++)
            {
                list.Add(new Wrapper { Name = "D", Description = "DDDDDDDDDD" });
            }
            ActDesc desc = new ActDesc(list);
            desc.DataBind();
            this.Controls.Add(desc);
            base.CreateChildControls();
        }
    }
}

public class ActDesc : CompositeControl
{
    IEnumerable<Wrapper> list = new Wrapper[] { };
    public ActDesc(IEnumerable<Wrapper> list)
    {
        this.list = list;
    }
    private void ControlsCreate()
    {
        this.Controls.Clear();
        Table activityDescription = new Table();
        int i = 1;
        foreach (var item in list)
        {
            TableRow tempRow = new TableRow();
            TableCell tempLeftCell = new TableCell();
            tempLeftCell.Text = item.Name;

            TableCell tempRightCell = new TableCell();
            tempRightCell.HorizontalAlign = HorizontalAlign.Right;

            if (EditId == 0)
            {
                ImageButton editButton = new ImageButton();
                editButton.ID = string.Format("editButton_{0}", i);
                editButton.ImageUrl = "add_16.png";
                editButton.CommandArgument = i.ToString();
                editButton.Command += new CommandEventHandler(editButton_Command);
                editButton.CommandName = "Edit";

                tempRightCell.Controls.Add(editButton);
            }
            else
            {
                if (EditId == i)
                {
                    ImageButton saveButton = new ImageButton();
                    saveButton.ID = string.Format("saveButton_{0}", i);
                    saveButton.ImageUrl = "~/save.png";
                    saveButton.CommandArgument = i.ToString();
                    saveButton.Command += new CommandEventHandler(editButton_Command);
                    saveButton.CommandName = "Save";

                    tempRightCell.Controls.Add(saveButton);
                }
            }

            tempRow.Cells.Add(tempLeftCell);
            tempRow.Cells.Add(tempRightCell);

            //Add the first row which contains the header name and the edit button if AllowEdit is true
            activityDescription.Rows.Add(tempRow);

            tempRow = new TableRow();

            tempLeftCell = new TableCell();
            tempLeftCell.ColumnSpan = 2;

            Control tempControl;
            if (EditId > 0 && EditId.Equals(i))
            {
                TextBox txt = new TextBox();
                txt.TextMode = TextBoxMode.MultiLine;
                txt.ID = "txt" + i;
                txt.Text = item.Description;
                tempControl = txt;
            }
            else
            {
                Literal litContent = new Literal();
                litContent.ID = string.Format("literalContent_{0}", i);
                litContent.Mode = LiteralMode.Transform;
                litContent.Text = item.Description;

                tempControl = litContent;
            }

            tempLeftCell.Controls.Add(tempControl);
            tempRow.Cells.Add(tempLeftCell);

            // Add the second row which shows the detailed HTML description..
            activityDescription.Rows.Add(tempRow);
            i = i + 1;
        }
        this.Controls.Add(activityDescription);
    }
    protected override void CreateChildControls()
    {
        ControlsCreate();
        base.CreateChildControls();
    }

    void editButton_Command(object sender, CommandEventArgs e)
    {
        switch (e.CommandName)
        {
            case "Edit":
                string id = e.CommandArgument.ToString();
                EditId = Convert.ToInt32(id);
                ControlsCreate();
                break;
            default:
                break;
        }
    }
    public int EditId
    {
        set
        {
            this.ViewState["__EditId"] = value;
        }
        get
        {
            return Convert.ToInt32(this.ViewState["__EditId"]);
        }
    }
    public bool AllowEdit { get; set; }
}

Answer 1

要使控件具有事件，必须使用事件声明它。这是在vb.net中，但可以在这里转换：http://converter.telerik.com/。这也继承自scriptcontrol而不是复合，但它应该是相同的：

<Assembly: WebResource("myProject.FileUpload.css", "text/css", PerformSubstitution:=True)> 
< _
ToolboxData("<{0}:FileUpload ID='FileUpload{0}'  runat=""server""> </{0}:FileUpload>"), _
ClientCssResource("myProject.FileUpload.css")> _
Public Class FileUpload
    Inherits ScriptControl
    Implements INamingContainer, IPostBackEventHandler

    Private WithEvents btnMyButton As New Button

   .... 

    Protected Overrides Sub CreateChildControls()
        'method to create my controls
        createDynamicControls()

        'if you are using update panels and wish to do an async 
        ' post back, you must first register the conrol with 
        ' the pages script manager.  If you are not using update panels, you can
        ' skip this
        ScriptManager.GetCurrent(Page).RegisterAsyncPostBackControl(Me.btnMyButton)      

        MyBase.CreateChildControls()
    End Sub

   Protected Overrides Function SaveViewState() As Object
        Return New Pair(MyBase.SaveViewState(), Nothing)
    End Function


    Protected Overrides Sub LoadViewState(ByVal savedState As Object)
        MyBase.LoadViewState(CType(savedState, Pair).First)
        EnsureChildControls()
    End Sub

     Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
        attachWebResources()
        MyBase.OnInit(e)

    End Sub

    Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
        MyBase.OnLoad(e)
    End Sub

     Private Sub attachWebResources()
        'use this to attach an embedded CSS file with the DLL
        Dim styleLink As String = "<link rel='stylesheet' text='text/css' href='{0}' />"
        Dim location As String = Page.ClientScript.GetWebResourceUrl(Me.[GetType](), "myProject.FileUpload.css")
        Dim styleInclude As New LiteralControl([String].Format(styleLink, location))
        DirectCast(Page.Header, HtmlControls.HtmlHead).Controls.Add(styleInclude)
    End Sub

     Protected Sub btnMyButton _click(ByVal sender As Object, ByVal e As EventArgs) Handles btnMyButton .Click

      '....do stuff
    end sub
        Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
          'required for IPostBackEventHandler
    End Sub

  Private Sub createDynamicControls()
     controls.Clear()
     'instantiate your control here and add it to the controls object
  end sub
end Class

让我知道这是否有帮助，或者如果你被困在某个地方。

Answer 2

我确实找到了我的问题的答案问题是我认为我没有为可能使用不同ID重新创建的ID分配的控件因此与之前的回发期间保存的值不匹配。我还更改了回发处理程序中的代码，以便在设置this.ChildControlsCreated = false时调用EnsureChildControls，从而重新创建子控件。

CompositeControl在回发时创建控件？

2 个答案: