照着 利用表达式树构建委托改善反射性能 做了一点小更改正好适合自己用
public static class DynamicMethodBuilder {public static Delegate BuildDynamicDelegate(MethodInfo methodInfo, ConstructorInfo constructorInfo = null) {if (methodInfo == null)throw new ArgumentNullException("methodInfo"); List<ParameterExpression> paramExpressions = methodInfo.GetParameters().Select((p, i) =>{var name = "param" + (i + 1);return Expression.Parameter(p.ParameterType, name); }).ToList(); MethodCallExpression callExpression;if (methodInfo.IsStatic) {//Call(params....)callExpression = Expression.Call(methodInfo, par<p style="color:transparent">本文来源gao!daima.com搞$代!码网</p>amExpressions); }else{if (constructorInfo != null) {//Instance(params).Call(params....)List<ParameterExpression> constructorParamExpressions = constructorInfo.GetParameters().Select((p, i) =>{var name = "constparam" + (i + 1);return Expression.Parameter(p.ParameterType, name); }).ToList(); callExpression = Expression.Call(Expression.New(constructorInfo, constructorParamExpressions), methodInfo, paramExpressions); paramExpressions.InsertRange(0, constructorParamExpressions); }else{ callExpression = Expression.Call(Expression.New(methodInfo.ReflectedType), methodInfo, paramExpressions); } }return Expression.Lambda(callExpression, paramExpressions).Compile(); } }
测试：
public class Baby { private readonly DateTime _birthDay; public Baby(DateTime birthDay) { _birthDay = birthDay; } public Baby() { _birthDay = DateTime.Now; } public string GetBabyInfo(string name, int sex) => $"姓名：{name} , 出生天数：{ DateTime.Now- _birthDay} ,性别 ：{(sex == 1 ? "男" : "女")}"; } class Program { static void Main(string[] args) { Type targetType = Assembly.GetExecutingAssembly().GetType("ConsoleApplication1.Baby"); MethodInfo methodInfo = targetType.GetMethod("GetBabyInfo", new[] { typeof(string), typeof(int) }); ConstructorInfo constructor = targetType.GetConstructor(new[] { typeof(DateTime) }); WithConstructor(methodInfo, constructor); WithOutConstructor(methodInfo); Console.ReadKey(); } static void WithConstructor(MethodInfo methodInfo, ConstructorInfo constructor) { var func = (Func<DateTime, string, int, string>)DynamicMethodBuilder.BuildDynamicDelegate(methodInfo, constructor); Console.WriteLine(func(DateTime.Now.AddDays(-100), "糖墩儿", 1)); } static void WithOutConstructor(MethodInfo methodInfo) { var func = (Func<string, int, string>)DynamicMethodBuilder.BuildDynamicDelegate(methodInfo); Console.WriteLine(func("糖墩儿", 1)); } }
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