创建 class 的实例并从字符串调用方法

Question

String ClassName =  "MyClass"
String MethodName = "MyMethod"

我想达到：

var class = new MyClass; 
MyClass.MyMethod();

我看到了一些，例如有反射，但它们只显示，方法名称为字符串或 class 名称为字符串，任何帮助表示赞赏。

Answer 1

// Find a type you want to instantiate: you need to know the assembly it's in for it, we assume that all is is one assembly for simplicity
// You should be careful, because ClassName should be full name, which means it should include all the namespaces, like "ConsoleApplication.MyClass"
// Not just "MyClass"
Type type = Assembly.GetExecutingAssembly().GetType(ClassName);
// Create an instance of the type
object instance = Activator.CreateInstance(type);
// Get MethodInfo, reflection class that is responsible for storing all relevant information about one method that type defines
MethodInfo method = type.GetMethod(MethodName);
// I've assumed that method we want to call is declared like this
// public void MyMethod() { ... }
// So we pass an instance to call it on and empty parameter list
method.Invoke(instance, new object[0]);

Answer 2

类似的东西，可能需要更多检查：

string typeName = "System.Console"; // remember the namespace
string methodName = "Clear";

Type type = Type.GetType(typeName);

if (type != null)
{
    MethodInfo method = type.GetMethod(methodName);

    if (method != null) 
    {
        method.Invoke(null, null);
    }
}

请注意，如果您要传递参数，则需要将 method.Invoke 更改为

method.Invoke(null, new object[] { par1, par2 });

创建 class 的实例并从字符串调用方法

Create instance of class and call method from string

c#

reflection