AttributeExtensions.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / DynamicData / DynamicData / Util / AttributeExtensions.cs / 1305376 / AttributeExtensions.cs
                        

                        
                            namespace System.Web.DynamicData.Util { 
    using System;
    using System.Collections.Generic;
    using System.Linq;
 
    internal static class AttributeExtensions {
        ///  
        /// Gets the first attribute of a given time on the target AttributeCollection, or null. 
        /// 
        /// The attribute type 
        /// The AttributeCollection object
        /// 
        internal static TAttribute FirstOrDefault(this System.ComponentModel.AttributeCollection attributes) where TAttribute : Attribute {
            return attributes.OfType().FirstOrDefault(); 
        }
 
        internal static TResult GetAttributePropertyValue(this System.ComponentModel.AttributeCollection attributes, Func propertyGetter) 
            where TResult : class
            where TAttribute : Attribute { 

            return attributes.GetAttributePropertyValue(propertyGetter, null);
        }
 
        internal static TResult GetAttributePropertyValue(this System.ComponentModel.AttributeCollection attributes, Func propertyGetter, TResult defaultValue)
            where TAttribute : Attribute { 
 
            var attribute = attributes.FirstOrDefault();
 
            return attribute.GetPropertyValue(propertyGetter, defaultValue);
        }

        ///  
        /// Gets the property for a given attribute reference or returns null if the reference is null.
        ///  
        /// The attribute type 
        /// The type of the attribute's property
        /// The attribute reference 
        /// The function to evaluate on the attribute
        /// 
        internal static TResult GetPropertyValue(this TAttribute attribute, Func propertyGetter)
            where TResult : class 
            where TAttribute : Attribute {
 
            return attribute.GetPropertyValue(propertyGetter, null); 
        }
 
        /// 
        /// Gets the property for a given attribute reference or returns the default value if the reference is null.
        /// 
        /// The attribute type 
        /// The type of the attribute's property
        /// The attribute reference 
        /// The function to evaluate on the attribute 
        /// The default value to return if the attribute is null
        ///  
        internal static TResult GetPropertyValue(this TAttribute attribute, Func propertyGetter, TResult defaultValue)
            where TAttribute : Attribute {

            if (attribute != null) { 
                return propertyGetter(attribute);
            } 
            else { 
                return defaultValue;
            } 
        }
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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