70 lines
2.3 KiB
C#
70 lines
2.3 KiB
C#
#region Apache License 2.0
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/*
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Nuclex .NET Framework
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Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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using System;
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#if !NO_LINQ_EXPRESSIONS
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using System.Linq.Expressions;
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#endif
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namespace Nuclex.Support {
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/// <summary>Contains helper methods for observing property changed</summary>
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public static class ObservableHelper {
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#if !NO_LINQ_EXPRESSIONS
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/// <summary>Obtains the name of a property from a lambda expression</summary>
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/// <param name="property">
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/// Lambda expression for the property whose name will be returned
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/// </param>
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/// <returns>The name of the property contained in the lamba expression</returns>
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/// <remarks>
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/// <para>
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/// This method obtains the textual name of a property specified in a lambda
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/// expression. By going through a lambda expression, the property will be
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/// stated as actual code, allowing F2 refactoring to correctly update any
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/// references to the property when it is renamed.
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/// </para>
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/// <example>
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/// <code>
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/// string propertyName = ObservableHelper.GetPropertyName(() => SomeValue);
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/// Assert.AreEqual("SomeValue", propertyName);
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/// </code>
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/// </example>
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/// </remarks>
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public static string GetPropertyName<TValue>(Expression<Func<TValue>> property) {
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var lambda = (LambdaExpression)property;
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MemberExpression memberExpression;
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{
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var unaryExpression = lambda.Body as UnaryExpression;
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if(unaryExpression != null) {
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memberExpression = (MemberExpression)unaryExpression.Operand;
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} else {
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memberExpression = (MemberExpression)lambda.Body;
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}
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}
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return memberExpression.Member.Name;
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}
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#endif // !NO_LINQ_EXPRESSIONS
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}
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} // namespace Nuclex.Support
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