What are the purposes of using attributes?

Any time you want to attach extra information to an assembly, type or type member. Reflection is just the way to read those attributes at runtime. The actual uses are many. Just look at how the framework are using them for serialization, security, designer support etc.

MattiasSj?gren at 2007-10-8 >

Thanks dear.

Look at hear:

using System;

using System.Collections.Generic;

using System.Text;

using Atinegar.Library.ObjectModel;

namespace Atinegar.Library.ObjectModel

{

[Creator("Mohammad"), Construct(ConstructProgressive.UnderTesting)]

publicstaticclassAttributeHelper

publicstaticAttribute GetAttribute(Type attributeType, Type objectType)

{

object[] attributes = objectType.GetCustomAttributes(attributeType, false);

if (attributes == null || attributes.Length == 0) returnnull;

foreach (Attribute attribute in attributes) if (attribute.GetType() == attributeType) return attribute;

returnnull;

}

}

publicenumConstructProgressive

[Creator("Mohammad"), Construct(ConstructProgressive.InProgress), AttributeUsage(AttributeTargets.All)]

publicclassConstructAttribute : System.Attribute

#region ctors

public ConstructAttribute(ConstructProgressive progressive)

{

this.Progressive = progressive;

}

public ConstructAttribute()

{

this.Progressive = ConstructProgressive.None;

}

#endregion

#region Progressive

privateConstructProgressive progressive;

publicConstructProgressive Progressive

{

get { return progressive; }

privateset { progressive = value; }

}

#endregion

#region GetAttribute

publicstaticConstructAttribute GetAttribute(Type type)

{

ConstructAttribute result = (ConstructAttribute)AttributeHelper.GetAttribute(typeof(ConstructAttribute), type);

if (result == null) result = newConstructAttribute();

return result;

}

#endregion

[Creator("Mohammad"), Construct(ConstructProgressive.Completed)]

[AttributeUsage(AttributeTargets.All)]

publicclassCreatorAttribute : System.Attribute

privatestring name;

publicvirtualstring Name

{

get { return name; }

privateset { this.name = value; }

}

public CreatorAttribute(string name)

{

this.name = name;

}

private CreatorAttribute()

{

this.Name = "Unknown";

}

#region GetAttribute

publicstaticCreatorAttribute GetAttribute(Type type)

{

CreatorAttribute result = (CreatorAttribute)AttributeHelper.GetAttribute(typeof(CreatorAttribute), type);

if (result == null) result = newCreatorAttribute();

return result;

}

#endregion

}

mohammadMirmostafa at 2007-10-8 >