Connected.Components/Extensions/ExpressionExtensions.cs

// Copyright (c) MudBlazor 2021
// MudBlazor licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Linq.Expressions;
using Connected.Annotations;

namespace Connected
{
	public static class ExpressionExtensions
	{
		public static string GetFullPathOfMember<T>(this Expression<Func<T>> property)
		{
			var resultingString = string.Empty;
			var p = property.Body as MemberExpression;

			while (p != null)
			{
				if (p.Expression is MemberExpression)
				{
					resultingString = p.Member.Name + (resultingString != string.Empty ? "." : string.Empty) + resultingString;
				}
				p = p.Expression as MemberExpression;
			}
			return resultingString;
		}

		/// <summary>
		/// Returns the display name attribute of the provided field property as a string. If this attribute is missing, the member name will be returned.
		/// </summary>
		public static string GetLabelString<T>(this Expression<Func<T>> expression)
		{
			var memberExpression = (MemberExpression)expression.Body;
			var propertyInfo = memberExpression.Expression?.Type.GetProperty(memberExpression.Member.Name);
			return propertyInfo?.GetCustomAttributes(typeof(LabelAttribute), true).Cast<LabelAttribute>().FirstOrDefault()?.Name ?? string.Empty;
		}
	}
}