66 lines
2.1 KiB
C#
66 lines
2.1 KiB
C#
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// File: SymbolExtensions.cs
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// Author: Samuel Jack
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// Article: "Getting the MethodInfo of a generic method using Lambda expressions"
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// URL: http://blog.functionalfun.net/2009/10/getting-methodinfo-of-generic-method.html
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using System.Linq.Expressions;
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using System.Reflection;
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using System;
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namespace PixelCrushers.DialogueSystem { // Put in DialogueSystem namespace to prevent conflicts.
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public static class SymbolExtensions
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{
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/// <summary>
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/// Given a lambda expression that calls a method, returns the method info.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="expression">The expression.</param>
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/// <returns></returns>
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public static MethodInfo GetMethodInfo(Expression<Action> expression)
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{
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return GetMethodInfo((LambdaExpression)expression);
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}
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/// <summary>
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/// Given a lambda expression that calls a method, returns the method info.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="expression">The expression.</param>
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/// <returns></returns>
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public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> expression)
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{
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return GetMethodInfo((LambdaExpression)expression);
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}
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/// <summary>
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/// Given a lambda expression that calls a method, returns the method info.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="expression">The expression.</param>
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/// <returns></returns>
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public static MethodInfo GetMethodInfo<T, TResult>(Expression<Func<T, TResult>> expression)
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{
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return GetMethodInfo((LambdaExpression)expression);
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}
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/// <summary>
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/// Given a lambda expression that calls a method, returns the method info.
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/// </summary>
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/// <param name="expression">The expression.</param>
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/// <returns></returns>
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public static MethodInfo GetMethodInfo(LambdaExpression expression)
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{
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MethodCallExpression outermostExpression = expression.Body as MethodCallExpression;
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if (outermostExpression == null)
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{
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throw new ArgumentException("Invalid Expression. Expression should consist of a Method call only.");
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}
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return outermostExpression.Method;
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}
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}
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}
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