I get exception can`t create object of type label from string representation when I set target label of custom control in ASP.NET

Question

1.00/5 (2 votes)

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.NET4.5

What i need to do to create custom control derived from textbox that set output error message of database verfication to output Label So,

i got exception Cannot create an object of type 'System.Web.UI.WebControls.Label' from its string representation 'Label1'

i try these both code :

C#

public Label LabelMain
       {
            get; set;
       }

        public Label c
        {
            get { return FindControl(c.ID) as Label; }
            set { c = value as Label; }
        }

first one shows that exception,
second one KILL THE COMPILER and visual studio EXPLODE !!! YAAH WHY !!!

What i should do ?
i extremely

C#

search google, stackoverflow, .... and nothing fix my problem;

What I have tried:

i try casting The Returned Label As Label, but Visual Studio Exploded.

CSC.exe exploded too

Posted 27-Feb-17 3:23am

Member 10377426

Updated 27-Feb-17 8:38am

v2

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Comments

[no name] 27-Feb-17 9:24am

Also I May Target Many Controls As Output Result From My Custom Control For Example,
Focusing To Next Control Developer Set

[no name] 27-Feb-17 12:55pm

please i want this fix fast ??? guys ???

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Richard Deeming · Accepted Answer · 2017-02-27T08:38:00

Quote:

C#

public Label c
{
    ...
    set { c = value as Label; }
}

A classic example of infinite recursion. :)

You set c to something, which calls the setter for c, which calls the setter for c, which calls the setter for c, which calls...

Eventually, you'll get, not an "explosion", but a StackOverflowException. Which is almost always caused by infinite recursion.

You're going to need to split this into two properties: one of type Label, which can be set from the code-behind; and another of type string, which can be set to the label's ID from the markup:

C#

[TypeConverter(typeof(ControlIDConverter))]
[IDReferenceProperty]
public string LabelMainID
{
    get { return (string)ViewState["LabelMainID"] ?? string.Empty; }
    set { ViewState["LabelMainID"] = value; }
}

public Label LabelMain
{
    get
    {
        string id = LabelMainID;
        if (string.IsNullOrEmpty(id)) return null;
        return NamingContainer.FindControl(id) as Label;
    }
    set
    {
        if (value == null)
        {
            LabelMainID = null;
        }
        else
        {
            LabelMainID = value.ID;
        }
    }
}