我正在尝试基于 CompositeControl 类创建工厂模式。
一切正常。除非我理解它，否则我必须将控件添加回我实际页面上的占位符控件。我四处寻找示例并得到一个几乎可以工作的示例，期望它仅在第一次回发时有效。
我在这里创建了一个示例，我将在这里发布所有代码。
我网页上的代码，这里最重要的是我想在 OnInit 上我试图将控件添加回占位符，我想这可能是我做错了。
using SampleControls;
public partial class Test : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//Setup First Control
Session.Clear();
BaseCompositeControl ltb = new LabelTextBox();
PlaceHolder1.Controls.Add(ltb);
Session.Add("Control", ltb);
}
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
// Check if the post back and recreate the control
if (IsPostBack)
{
int c = this.Form.Controls.Count;
for (int i = 0; i < Session.Count; i++)
{
if (Session[i].ToString().Contains("Control"))
{
this.PlaceHolder1.Controls.Add((BaseCompositeControl)(Session[i]));
}
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
//Get Postback Date
BaseCompositeControl oltb = (BaseCompositeControl)this.PlaceHolder1.Controls[0];
lblPstBck.Text = oltb.Text;
this.PlaceHolder1.Controls.Clear();
Session.Clear();
//Load next Control
BaseCompositeControl ltb = new LabelCheckBox();
PlaceHolder1.Controls.Add(ltb);
Session.Add("Control", ltb);
}
}
这是复合控件类，我不知道我是否必须在这里做一些事情来处理视图状态或如何处理？
public abstract class BaseCompositeControl : CompositeControl
{
protected string _Title;
public abstract string Text
{
get;
set;
}
public string Title
{
get { EnsureChildControls();
return _Title; }
set { EnsureChildControls();
_Title = value; }
}
protected override void CreateChildControls()
{
// Clears child controls
Controls.Clear();
// Build the control tree
CreateControlHierarchy();
ClearChildViewState();
}
protected abstract void CreateControlHierarchy();
}
文本框控件
public class LabelCheckBox : BaseCompositeControl
{
protected CheckBox _CheckBox;
public override string Text
{
get
{
EnsureChildControls();
return _CheckBox.Checked.ToString(); ;
}
set
{
EnsureChildControls();
_CheckBox.Checked = Convert.ToBoolean(value);
}
}
protected override void CreateControlHierarchy()
{
_CheckBox = new CheckBox();
Label l = new Label();
// Configure controls
l.Text = "Second Control";
// Connect to the parent
Controls.Add(l);
Controls.Add(_CheckBox);
}
}
复选框控件
public class LabelTextBox : BaseCompositeControl
{
protected TextBox _Text;
public override string Text
{
get
{
EnsureChildControls();
return _Text.Text;
}
set
{
EnsureChildControls();
_Text.Text = value;
}
}
protected override void CreateControlHierarchy()
{
Label l = new Label();
_Text = new TextBox();
// Configure controls
l.Text = "First Control";
// Connect to the parent
Controls.Add(l);
Controls.Add(_Text);
}
}