HelpKeywordAttribute.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / Design / HelpKeywordAttribute.cs / 1 / HelpKeywordAttribute.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 

namespace System.ComponentModel.Design { 
    using System;
    using System.Security.Permissions;

    ///  
    /// Allows specification of the context keyword that will be specified for this class or member.  By default,
    /// the help keyword for a class is the Type's full name, and for a member it's the full name of the type that declared the property, 
    /// plus the property name itself. 
    ///
    /// For example, consider System.Windows.Forms.Button and it's Text property: 
    ///
    /// The class keyword is "System.Windows.Forms.Button", but the Text property keyword is "System.Windows.Forms.Control.Text", because the Text
    /// property is declared on the System.Windows.Forms.Control class rather than the Button class itself; the Button class inherits the property.
    /// By contrast, the DialogResult property is declared on the Button so its keyword would be "System.Windows.Forms.Button.DialogResult". 
    ///
    /// When the help system gets the keywords, it will first look at this attribute.  At the class level, it will return the string specified by the 
    /// HelpContextAttribute.  Note this will not be used for members of the Type in question.  They will still reflect the declaring Type's actual 
    /// full name, plus the member name.  To override this, place the attribute on the member itself.
    /// 
    /// Example:
    ///
    /// [HelpKeywordAttribute(typeof(Component))]
    /// public class MyComponent : Component { 
    ///
    /// 
    ///     public string Property1 { get{return "";}; 
    ///
    ///     [HelpKeywordAttribute("SomeNamespace.SomeOtherClass.Property2")] 
    ///     public string Property2 { get{return "";};
    ///
    /// }
    /// 
    ///
    /// For the above class (default without attribution): 
    /// 
    /// Class keyword: "System.ComponentModel.Component" ("MyNamespace.MyComponent')
    /// Property1 keyword: "MyNamespace.MyComponent.Property1" (default) 
    /// Property2 keyword: "SomeNamespace.SomeOtherClass.Property2" ("MyNamespace.MyComponent.Property2")
    ///
    /// 
    [AttributeUsage(AttributeTargets.All, AllowMultiple = false, Inherited = false)] 
    [Serializable]
    public sealed class HelpKeywordAttribute : Attribute { 
 
        /// 
        /// Default value for HelpKeywordAttribute, which is null. 
        /// 
        public static readonly HelpKeywordAttribute Default = new HelpKeywordAttribute();

        private string contextKeyword; 

        ///  
        /// Default constructor, which creates an attribute with a null HelpKeyword. 
        /// 
        public HelpKeywordAttribute() { 
        }

        /// 
        /// Creates a HelpKeywordAttribute with the value being the given keyword string. 
        /// 
        public HelpKeywordAttribute(string keyword) { 
            if (keyword == null) { 
                throw new ArgumentNullException("keyword");
            } 
            this.contextKeyword = keyword;
        }

        ///  
        /// Creates a HelpKeywordAttribute with the value being the full name of the given type.
        ///  
        public HelpKeywordAttribute(Type t) { 
            if (t == null) {
                throw new ArgumentNullException("t"); 
            }
            this.contextKeyword = t.FullName;
        }
 
        /// 
        /// Retrieves the HelpKeyword this attribute supplies. 
        ///  
        public string HelpKeyword {
            get { 
                return contextKeyword;
            }
        }
 

        ///  
        /// Two instances of a HelpKeywordAttribute are equal if they're HelpKeywords are equal. 
        /// 
        public override bool Equals(object obj) { 
            if (obj == this) {
                return true;
            }
            if ((obj != null) && (obj is HelpKeywordAttribute)) { 
                return ((HelpKeywordAttribute)obj).HelpKeyword == HelpKeyword;
            } 
 
            return false;
        } 

        /// 
        /// 
        public override int GetHashCode() { 
            return base.GetHashCode();
        } 
 
        /// 
        /// Returns true if this Attribute's HelpKeyword is null. 
        /// 
        public override bool IsDefaultAttribute() {
            return this.Equals(Default);
        } 
    }
}

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