I am having trouble with postback data for a composite control. The control is esentially a texbox, but can be a label if the ReadOnly property is set to true. On postback, I can't seem to get the value of the textbox. It is really weird to me also because once the page is fully rendered, the textbox contains the posted value!! What is going on??
aspx code
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %>
<%@ Register Namespace="MyControls" TagPrefix="sgm" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml"
>
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
TextBox1
<asp:TextBox runat="server" ID="TextBox1"></asp:TextBo
x>
<br />
TextBox2
<sgm:SgmTextBox ID="TextBox2" runat="server" />
<br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_OnClick" />
</div>
</form>
</body>
</html>
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aspx.cs code
using System;
using System.Web.UI;
public partial class _Default :Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_OnClick(object sender, EventArgs e)
{
TextBox1.Text += "!";
TextBox2.Text += "!";
}
}
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SgmTextBox.cs code in App_Code
using System;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections.Special
ized;
namespace MyControls
{
[DefaultProperty("Text")]
[ToolboxData("<{0}:SgmText
Box runat=\"server\"></{0}:Sgm
TextBox>")
]
public sealed class SgmTextBox : CompositeControl, IPostBackDataHandler
{
public SgmTextBox()
{
}
[Bindable(false)]
[Browsable(true)]
[Category("Behavior")]
[DefaultValue(false)]
[Themeable(true)]
public bool ReadOnly
{
get
{
object readOnly = ViewState["ReadOnly"];
return (readOnly != null) ? (bool)readOnly : false;
}
set
{
ViewState["ReadOnly"] = value;
}
}
[Bindable(true)]
[Browsable(true)]
[Category("Data")]
[DefaultValue("")]
[Themeable(false)]
public string Text
{
get
{
object text = ViewState["Text"];
return (text != null) ? (string)text : string.Empty;
}
set
{
ViewState["Text"] = value;
}
}
protected override void CreateChildControls()
{
Controls.Clear();
if (ReadOnly)
{
Label label = new Label();
label.EnableViewState = false;
Controls.Add(label);
}
else
{
TextBox textBox = new TextBox();
textBox.EnableViewState = false;
textBox.Height = Height;
textBox.Width = Width;
Controls.Add(textBox);
}
}
public bool LoadPostData(string postDataKey, NameValueCollection postCollection)
{
string currentText = Text;
string postedText = postCollection[postDataKey
];
if (!currentText.Equals(poste
dText, StringComparison.Ordinal))
{
Text = postedText;
return true;
}
return false;
}
public void RaisePostDataChangedEvent(
)
{
return;
}
}
}
