我在命名空间中有几个静态类
mySolution.Macros
例如
static class Indent{
public static void Run(){
// implementation
}
// other helper methods
}
所以我的问题是如何在反射的帮助下调用这些方法?
如果方法不是静态的,那么我可以这样做:
var macroClasses = Assembly.GetExecutingAssembly().GetTypes().Where( x => x.Namespace.ToUpper().Contains("MACRO") );
foreach (var tempClass in macroClasses)
{
var curInstance = Activator.CreateInstance(tempClass);
// I know have an instance of a macro and will be able to run it
// using reflection I can run the method as:
curInstance.GetType().GetMethod("Run").Invoke(curInstance, null);
}
我想保持我的课程静态。我怎样才能用静态方法做类似的事情?
简而言之我想从命名空间 mySolution.Macros 中的所有静态类调用所有 Run 方法。
正如 MethodInfo.Invoke 文档所述,静态方法会忽略第一个参数,因此您可以只传递 null。
foreach (var tempClass in macroClasses)
{
// using reflection I will be able to run the method as:
tempClass.GetMethod("Run").Invoke(null, null);
}
正如评论所指出的,您可能希望在调用时确保该方法是静态的
GetMethod
:
tempClass.GetMethod("Run", BindingFlags.Public | BindingFlags.Static).Invoke(null, null);
static class Indent{
public static void Run(){
// implementation
}
// other helper methods
}
static class MacroRunner {
static MacroRunner() {
BuildMacroRunnerList();
}
static void BuildMacroRunnerList() {
macroRunners = System.Reflection.Assembly.GetExecutingAssembly()
.GetTypes()
.Where(x => x.Namespace.ToUpper().Contains("MACRO"))
.Select(t => (Action)Delegate.CreateDelegate(
typeof(Action),
null,
t.GetMethod("Run", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public)))
.ToList();
}
static List<Action> macroRunners;
public static void Run() {
foreach(var run in macroRunners)
run();
}
}
这样要快得多。
如果您的方法签名与 Action 不同,您可以将 Action 中的类型转换和 typeof 替换为任何所需的 Action 和 Func 泛型类型,或者声明您的 Delegate 并使用它。我自己的实现使用 Func 来漂亮地打印对象:
static class PrettyPrinter {
static PrettyPrinter() {
BuildPrettyPrinterList();
}
static void BuildPrettyPrinterList() {
printers = System.Reflection.Assembly.GetExecutingAssembly()
.GetTypes()
.Where(x => x.Name.EndsWith("PrettyPrinter"))
.Select(t => (Func<object, string>)Delegate.CreateDelegate(
typeof(Func<object, string>),
null,
t.GetMethod("Print", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Public)))
.ToList();
}
static List<Func<object, string>> printers;
public static void Print(object obj) {
foreach(var printer in printers)
print(obj);
}
}
namespace myNamespace
{
public class myClass
{
public static void voidMethodWithoutParameters()
{
// code here
}
public static string stringReturnMethodWithParameters(string param1, string param2)
{
// code here
return "output";
}
}
}
使用 Reflection 调用 myClass 静态方法:
var myClassType = Assembly.GetExecutingAssembly().GetType(GetType().Namespace + ".myClass");
// calling my void Method that has no parameters.
myClassType.GetMethod("voidMethodWithoutParameters", BindingFlags.Public | BindingFlags.Static).Invoke(null, null);
// calling my string returning Method & passing to it two string parameters.
Object methodOutput = myClassType.GetMethod("stringReturnMethodWithParameters", BindingFlags.Public | BindingFlags.Static).Invoke(null, new object[] { "value1", "value1" });
Console.WriteLine(methodOutput.ToString());
注意:我不需要实例化 myClass 的对象来使用它的方法,因为我使用的方法是 static
。丰富的资源:
private void _InvokeNamespaceClassesStaticMethod(string namespaceName, string methodName, params object[] parameters) {
foreach(var _a in AppDomain.CurrentDomain.GetAssemblies()) {
foreach(var _t in _a.GetTypes()) {
try {
if((_t.Namespace == namespaceName) && _t.IsClass) _t.GetMethod(methodName, (BindingFlags.Static | BindingFlags.Public))?.Invoke(null, parameters);
} catch { }
}
}
}
使用...
_InvokeNamespaceClassesStaticMethod("mySolution.Macros", "Run");
但是如果您正在寻找更强大的东西,包括异常处理......
private InvokeNamespaceClassStaticMethodResult[] _InvokeNamespaceClassStaticMethod(string namespaceName, string methodName, bool throwExceptions, params object[] parameters) {
var results = new List<InvokeNamespaceClassStaticMethodResult>();
foreach(var _a in AppDomain.CurrentDomain.GetAssemblies()) {
foreach(var _t in _a.GetTypes()) {
if((_t.Namespace == namespaceName) && _t.IsClass) {
var method_t = _t.GetMethod(methodName, parameters.Select(_ => _.GetType()).ToArray());
if((method_t != null) && method_t.IsPublic && method_t.IsStatic) {
var details_t = new InvokeNamespaceClassStaticMethodResult();
details_t.Namespace = _t.Namespace;
details_t.Class = _t.Name;
details_t.Method = method_t.Name;
try {
if(method_t.ReturnType == typeof(void)) {
method_t.Invoke(null, parameters);
details_t.Void = true;
} else {
details_t.Return = method_t.Invoke(null, parameters);
}
} catch(Exception ex) {
if(throwExceptions) {
throw;
} else {
details_t.Exception = ex;
}
}
results.Add(details_t);
}
}
}
}
return results.ToArray();
}
private class InvokeNamespaceClassStaticMethodResult {
public string Namespace;
public string Class;
public string Method;
public object Return;
public bool Void;
public Exception Exception;
}
用法几乎相同...
_InvokeNamespaceClassesStaticMethod("mySolution.Macros", "Run", false);