此篇将介绍C#如何在运行时动态调用方法。当某些类型是运行时动态确定时，编译时的静态编码是无法解决这些动态对象或类的方法调用的。此篇则给你一把利剑，让动态对象的方法调用成为可能。
1.动态调用dll里的方法:
<span style="font-family:SimSun;font-size:12px;">/// <summary> /// 该类将被独立编入Class1.dll汇编 /// </summary> class Class1 {public static string method1(){return "I am Static method (method1) in class1";}public string method2(){return "I am a Instance Method (method2) in Class1";}public string method3(string s){return "Hello " + s;} }/// <summary> /// 该类独立放入Test.exe汇编 /// </summary> class DynamicInvoke {public static void Main(string[] args){// 动态加载汇编string path = "Class1.dll";Assembly assembly = Assembly.Load(path);// 根据类型名得到TypeType type = assembly.GetType("Class1");// 1.根据方法名动态调用静态方法string str = (string)type.InvokeMember("method1", BindingFlags.Default | BindingFlags.InvokeMethod, null, null, new object[] { });Console.WriteLine(str);// 2.根据方法名动态调用动态对象的成员方法object o = Activator.CreateInstance(type);str = (string)type.InvokeMember("method2", BindingFlags.Default | BindingFlags.InvokeMethod, null, o, new object[] { });Console.WriteLine(str);// 3.根据方法名动态调用动态对象的有参成员方法object[] par = new object[] { "kunal" };str = (string)type.InvokeMember("method3", BindingFlags.Default | BindingFlags.InvokeMethod, null, o, par);Console.WriteLine(str);// 带out修饰的InvokeMember// System.Int32 中 public static bool TryParse(string s, out int result) 方法的调用var arguments = new object[] { str, null }; // 注意这里只能将参数写在外面，out参数为null也没有关系typeof(int).InvokeMember("TryParse", System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.InvokeMethod | System.Reflection.BindingFlags.Static,null, null, arguments);Console.WriteLine(arguments[1]);} }</span>
2.动态加载类文件并调用方法：
using System; using System.CodeDom.Compiler; using System.IO; using System.Reflection; using System.Threading; using System.Windows.Forms; using Microsoft.CSharp;namespace _32.DynamicReflection {internal class Program{private static void Main(string[] args){#region 内置标签方法 (动态加载)const string className = "DynamicReflection.Test"; //类名称一定要全称string fileName = <strong>Thread.GetDomain().BaseDirectory + "Test.cs";</strong>if (File.Exists(fileName)){var sourceFile = new FileInfo(fileName);CodeDomProvider provider = new CSharpCodeProvider();var cp = new CompilerParameters();cp.ReferencedAssemblies.Add("System.dll"); //添加命名空间引用 cp.GenerateExecutable = false; // 生成类库cp.GenerateInMemory = true; // 保存到内存cp.TreatWarningsAsErrors = false; // 不将编译警告作为错误// 编译CompilerResults cr = provider.CompileAssemblyFromFile(cp, sourceFile.FullName);if (cr.Errors.Count < 1){Assembly asm = cr.CompiledAssembly; // 加载//1.调用静态方法Type type = asm.GetType(className);var str =(string)type.InvokeMember("SayHello1", BindingFlags.Default | BindingFlags.InvokeMethod, null, null, new object[] {});Console.WriteLine(str);//2.调用实例方法object instance = asm.CreateInstance(className);str =(string)type.InvokeMember("SayHello2", BindingFlags.Default | BindingFlags.InvokeMethod, null, instance,new object[] {});Console.WriteLine(str);//3.调用带参数的方法var par = new object[] {"zhangqs008"};str =(string)type.InvokeMember("SayHello3", BindingFlags.Default | BindingFlags.InvokeMethod, null, instance,par);Console.WriteLine(str);Console.Read();}else{string msg = null;for (int index = 0; index < cr.Errors.Count; index++){CompilerError error = cr.Errors[index];msg += "【错误" + (index + 1) + "】" + Environment.NewLine;msg += "[文件] " + error.FileName + Environment.NewLine;msg += "[位置] 行" + error.Line + ",列" + error.Column + Environment.NewLine;msg += "[信息] " + error.ErrorText + Environment.NewLine;msg += Environment.NewLine;}MessageBox.Show(msg, "内置方法类编译错误");}}#endregion}} }
类文件：
DynamicReflection {public class Test{public static string SayHello1(){return "hello static method";}public string SayHello2(){return "hello instance method";}public string SayHello3(string args){return "hello args " + args;}} }