一个特性的例子

[global::System.AttributeUsage(AttributeTargets.All, Inherited = false, AllowMultiple = true)]
sealed class MyControlAttribute : Attribute
{
    // See the attribute guidelines at 
    //  http://go.microsoft.com/fwlink/?LinkId=85236
    readonly string positionalString;

    // This is a positional argument
    public MyControlAttribute(string positionalString)
    {
        this.positionalString = positionalString;

        // TODO: Implement code here
        throw new NotImplementedException();
    }

    public string PositionalString
    {
        get { return positionalString; }
    }

    // This is a named argument
    public int NamedInt { get; set; }


    public ControlTypes ControlName
    { get; set; }


    public MyControlAttribute()
    {
        
    }
}

public class MyClass
{
    [MyControl(ControlName = ControlTypes.TextBox)]
    public string MyProperty
    { get; set; }
}


public enum ControlTypes
{
    TextBox,
    DropDownList,
    Label,
}