68 lines
3.2 KiB
C#
68 lines
3.2 KiB
C#
namespace System.Web.DynamicData.Util {
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using System;
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using System.Collections.Generic;
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using System.Linq;
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internal static class AttributeExtensions {
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/// <summary>
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/// Gets the first attribute of a given time on the target AttributeCollection, or null.
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/// </summary>
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/// <typeparam name="TAttribute">The attribute type</typeparam>
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/// <param name="attributes">The AttributeCollection object</param>
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/// <returns></returns>
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internal static TAttribute FirstOrDefault<TAttribute>(this System.ComponentModel.AttributeCollection attributes) where TAttribute : Attribute {
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return attributes.OfType<TAttribute>().FirstOrDefault();
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}
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internal static TResult GetAttributePropertyValue<TAttribute, TResult>(this System.ComponentModel.AttributeCollection attributes, Func<TAttribute, TResult> propertyGetter)
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where TResult : class
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where TAttribute : Attribute {
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return attributes.GetAttributePropertyValue(propertyGetter, null);
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}
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internal static TResult GetAttributePropertyValue<TAttribute, TResult>(this System.ComponentModel.AttributeCollection attributes, Func<TAttribute, TResult> propertyGetter, TResult defaultValue)
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where TAttribute : Attribute {
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var attribute = attributes.FirstOrDefault<TAttribute>();
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return attribute.GetPropertyValue<TAttribute, TResult>(propertyGetter, defaultValue);
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}
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/// <summary>
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/// Gets the property for a given attribute reference or returns null if the reference is null.
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/// </summary>
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/// <typeparam name="TAttribute">The attribute type</typeparam>
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/// <typeparam name="TResult">The type of the attribute's property</typeparam>
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/// <param name="attribute">The attribute reference</param>
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/// <param name="propertyGetter">The function to evaluate on the attribute</param>
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/// <returns></returns>
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internal static TResult GetPropertyValue<TAttribute, TResult>(this TAttribute attribute, Func<TAttribute, TResult> propertyGetter)
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where TResult : class
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where TAttribute : Attribute {
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return attribute.GetPropertyValue(propertyGetter, null);
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}
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/// <summary>
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/// Gets the property for a given attribute reference or returns the default value if the reference is null.
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/// </summary>
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/// <typeparam name="TAttribute">The attribute type</typeparam>
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/// <typeparam name="TResult">The type of the attribute's property</typeparam>
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/// <param name="attribute">The attribute reference</param>
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/// <param name="propertyGetter">The function to evaluate on the attribute</param>
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/// <param name="defaultValue">The default value to return if the attribute is null</param>
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/// <returns></returns>
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internal static TResult GetPropertyValue<TAttribute, TResult>(this TAttribute attribute, Func<TAttribute, TResult> propertyGetter, TResult defaultValue)
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where TAttribute : Attribute {
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if (attribute != null) {
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return propertyGetter(attribute);
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}
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else {
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return defaultValue;
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}
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}
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}
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}
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