ASP.NET服务器控件属性问题（？）

Question

I am working on some ASP.NET Server Control, and I have an issue. Maybe I oversee something, I don't know.

Anyway:

public string Name
{
    get
    {
        String s = (String)ViewState["name"];
        return ((s == null) ? String.Empty : s);
    }

    set
    {
        ViewState["name"] = value;
    }
}



protected override void RenderContents(HtmlTextWriter output)
{
    txt.ID = Name; // Name here exists
    txt.Text = DateTime.Now.ToShortDateString();

    txt.RenderControl(output);

    output.Write(someName(someValue));

}

public string GetCalendarString(string date)
{
    some code...
    // Name property is null
}

'RenderContents' uses property 'Name' to set the control name and then calls 'someName' function and 'someName' function also uses property 'Name', but when I run it, property 'Name' inside function 'someName' is empty, although in 'RenderContents' it is not.

Gremlins, or I'm missing something?

Answer 1

This is going to be tough to answer because without debugging there will be no way to tell what outside forces have manipulated the data.

Since Name is a public property any control that has access to it could set it to null at any point prior to your call to GetCalendarString . Also if you are calling GetCalendarString before ViewState is loaded this value will not be available. I suspect that you are trying to get Name from ViewState before it has loaded but again this is a problem best solved by debugging.

By the way - here is a great image that shows the ASP.NET life cycle and will help you figure out if you are trying to use ViewState before it is loaded from the Request .