Accessing inner value of ASP.NET Web User Control

Question

Surprised that i havent been able to find this myself, but anyway. Let's say i use my web user control like this:

<myprefix:mytag userid="4" runat="server">Some fancy text</myprefix:mytag>

How would i be able to access the text inside the tags from its codebehind ("Some fancy text")? Was expecting it to be exposed through this.Text, this.Value or something similar.

EDIT: I even get the following warning on the page where i try to user it: Content is not allowed between the opening and closing tags for element 'mytag'.

EDIT2:

public partial class mytag: UserControl
{
    public int ItemID { get; set; }
    protected void Page_Load(object sender, EventArgs e)
    {           
    }
}

scherand · Accepted Answer · 2010-03-31 09:34:04Z

10

I assume your custom control has a property called Text of type string. If you then declare this property to have the persistence mode "InnerDefaultProperty" you should get what you are looking for.

E.g.

/// <summary>
/// Default Text property ("inner text" in HTML/Markup)
/// </summary>
[PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public string PropertyTest
{
    get
    {
        object o = this.ViewState["Text"];
        if (o != null)
        {
            return (string)o;
        }
        return string.Empty;
    }
    set
    {
        this.ViewState["Text"] = value;
    }
}

Edit: To avoid the "Literal Content Not Allowed" you have to help the parser by adding [ParseChildren(true, "PropertyTest")] to your class definition (see MSDN).

And of course you need a writable property (i.e. it needs a setter which I omitted for shortness before).

edited Mar 31, 2010 at 9:34

answered Mar 31, 2010 at 8:55

scherand

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1 Comment

Fabian Over a year ago

Using this im getting the following parser error: Literal content ('Some fancy text') is not allowed within a 'ASP.mytag_ascx'.

George · Accepted Answer · 2015-05-27 07:16:49Z

0

Just add one line before the class ([ParseChildren(true, "TestInnerText")]), and add a property named "TestInnerText". Create any control of your choice, I have created LiteralControl just to display inner html view.

"TestInnerText" - is just a temporary name I gave, you can use any property name of your choice.

[ParseChildren(true, "TestInnerText")]
public partial class mytag : UserControl
{
    public string TestInnerText
    {
        set
        {
            LiteralControl lc=new LiteralControl();
            lc.Text=value;
            this.Controls.Add(lc);
        }
    }
    protected void Page_Load(object sender, EventArgs e)
    {
    }
}

answered May 27, 2015 at 7:16

George

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