如何在C＃中的父用户控件的标签上显示字符串消息？

Question

I have many User controls in my application. Among which some are parent control of others.Every User control has labels for show messages.I want to write a function which is some thing like below:

public void ShowMessageInParent(UserControl control,string msg)
        { 
            //get 1st parent control and show message on its label.                   
        }

How can I do it?

Answer 1

The following will work for WPF or WinForms - as you stated too late that you're talking about ASP.NET:

I'd create an event StatusMessageChanged with a corresponding class derived from EventArgs . If the message is to be changed, call the event. If the parent control has attached to the event, it can evaluate the arguments and show the message.

public class StatusMessageChangedEventArgs : EventArgs
{
    public StatusMessageChangedEventArgs(string message)
    {
        Message = message;
    }

    public string Message
    {
        get;
        private set;
    }
}

public event<StatusMessageChangedEventArgs> StatusMessageChanged;

protected void OnStatusMessageChanged(string message)
{
    if (StatusMessageChanged != null)
        StatusMessageChanged(this, new StatusMessageChangedEventArgs(message));
}

Answer 2

I think you wrote a CustomUserControl witch has a label control inside it.

If so you should use

control.Parent.Controls.Find("Label", false);