| 以下是代码片段: namespace System.Extension.Dynamic { public static class Dynamic { private static Dictionary<PropertyInfo, object> propertyGetters = new Dictionary<PropertyInfo, object>(); public static object Property(this object instance, string name) { var instanceType = instance.GetType(); var propertyInfo = instanceType.GetProperty(name); if (propertyInfo == null) throw new InvalidOperationException(); if (!propertyInfo.CanRead) throw new InvalidOperationException(); object compiled; if (!propertyGetters.TryGetValue(propertyInfo, out compiled)) { var parameter = Expression.Parameter(typeof(object), "obj"); var convertParameter = Expression.Convert(parameter, instance.GetType()); var property = Expression.Property(convertParameter, propertyInfo); var convertReturnValue = Expression.Convert(property, typeof(object)); var lambda = Expression.Lambda(convertReturnValue, parameter); compiled = lambda.Compile(); propertyGetters.Add(propertyInfo, compiled); } return ((Func<object, object>)compiled)(instance); } } } |
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