我正在编写管道逻辑。这个想法是在对象的实例中动态创建并在每种情况下执行方法 Run 方法。我可以很容易地用反射 Activator.CreateInstance 做旧方法,但在这种情况下性能很重要。
我看了很多代码示例和教程,我认为我正确地使用了 Lambda 表达式。我只能弄清楚调用部分。提前致谢。
namespace Pipelines
{
using System;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
public interface IProcessor
{
string Name { get; set; }
}
public interface IAspNetMembershipId : IProcessor
{
Guid? Id { get; set; }
}
public class ProcessorOne
{
public void Run(IProcessor args)
{
/* Do Something */
}
}
public class ProcessorTwo
{
public void Run(IAspNetMembershipId args)
{
/* Do Something */
}
}
public class Program
{
static void Main(string[] args)
{
var arguments = new AspNetMembershipId() { Name = "jim" };
/* Pipeline1 Begin */
Type type = typeof(ProcessorOne);
NewExpression newExp = Expression.New(type);
var p1 = Expression.Parameter(newExp.Type, "ProcessorOne");
var p2 = Expression.Parameter(typeof(IProcessor), "args");
MethodInfo methodInfo = (from method in newExp.Type.GetMethods() where method.Name.StartsWith("Run") select method).First();
var invokeExpression = Expression.Call(p1, methodInfo, p2);
Delegate func = Expression.Lambda(invokeExpression, p1, p2).Compile();
/* Throws an exception. This not correct! */
func.DynamicInvoke(newExp, arguments);
/* or */
func.DynamicInvoke(arguments);
/* Pipeline2 Begin */
}
}
}