86 lines
2.7 KiB
C#
86 lines
2.7 KiB
C#
// Copyright (c) All contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace MessagePack.Internal
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{
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internal static class ExpressionUtility
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{
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private static MethodInfo GetMethodInfoCore(LambdaExpression expression)
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{
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if (expression == null)
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{
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throw new ArgumentNullException("expression");
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}
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return ((MethodCallExpression)expression.Body).Method;
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}
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/// <summary>
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/// Get MethodInfo from Expression for Static(with result) method.
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/// </summary>
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public static MethodInfo GetMethodInfo<T>(Expression<Func<T>> expression)
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{
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return GetMethodInfoCore(expression);
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}
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/// <summary>
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/// Get MethodInfo from Expression for Static(void) method.
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/// </summary>
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public static MethodInfo GetMethodInfo(Expression<Action> expression)
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{
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return GetMethodInfoCore(expression);
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}
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/// <summary>
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/// Get MethodInfo from Expression for Instance(with result) method.
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/// </summary>
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public static MethodInfo GetMethodInfo<T, TR>(Expression<Func<T, TR>> expression)
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{
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return GetMethodInfoCore(expression);
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}
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/// <summary>
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/// Get MethodInfo from Expression for Instance(void) method.
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/// </summary>
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public static MethodInfo GetMethodInfo<T>(Expression<Action<T>> expression)
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{
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return GetMethodInfoCore(expression);
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}
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// WithArgument(for ref, out) helper
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/// <summary>
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/// Get MethodInfo from Expression for Instance(with result) method.
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/// </summary>
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public static MethodInfo GetMethodInfo<T, TArg1, TR>(Expression<Func<T, TArg1, TR>> expression)
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{
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return GetMethodInfoCore(expression);
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}
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private static MemberInfo GetMemberInfoCore<T>(Expression<T> source)
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{
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if (source == null)
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{
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throw new ArgumentNullException("source");
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}
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var memberExpression = (MemberExpression)source.Body;
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return memberExpression.Member;
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}
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public static PropertyInfo GetPropertyInfo<T, TR>(Expression<Func<T, TR>> expression)
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{
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return (PropertyInfo)GetMemberInfoCore(expression);
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}
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public static FieldInfo GetFieldInfo<T, TR>(Expression<Func<T, TR>> expression)
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{
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return (FieldInfo)GetMemberInfoCore(expression);
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}
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}
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}
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