这是你想要的吗？

 保护无效的Page_Load（对象发件人，EventArgs的发送）
{
    变种CB = FindControlByAttribute＆所述; HtmlInputCheckBox＆GT;（this.PageATTR-ID中，111）;}
公共ŧFindControlByAttribute＆LT; T＆GT;（CTL控制，串的attributeName，字符串的AttributeValue）其中T：HTMLControl时
{
    的foreach（在ctl.Controls控制C）
    {
        如果（c.GetType（）== typeof运算（T）及及（（T）C）.Attributes [的attributeName] ==的AttributeValue）
        {
            返程（T）C;
        }
        变种CB = FindControlByAttribute＆LT; T＆GT;（三，的attributeName，的AttributeValue）;
        如果（CB！= NULL）
            返回CB;
    }
    返回null;
}
 

I have a collection of checkbox some 40-50 nos and i have set a attribute 'attr-ID' for each checkbox which is a unique value ID in database. how can i get the control by attribute name in c# code. I want to check some of the checkbox according to dB values on page load event.

 <input type="checkbox" id="rdCervical" attr-ID='111' runat='server' />

Is this what you want?

protected void Page_Load(object sender, EventArgs e)
{
    var cb = FindControlByAttribute<HtmlInputCheckBox>(this.Page, "attr-ID", "111");

}
public T FindControlByAttribute<T>(Control ctl, string attributeName, string attributeValue) where T : HtmlControl
{
    foreach (Control c in ctl.Controls)
    {
        if (c.GetType() == typeof(T) && ((T)c).Attributes[attributeName]==attributeValue)
        {
            return (T) c;
        }
        var cb= FindControlByAttribute<T>(c, attributeName, attributeValue);
        if (cb != null)
            return cb;
    }
    return null;
}