C# 反射调用 - 类型“XXX"的对象无法转换为类型“System.Object[]"

我创建了一个名为 input 的实例，其类型为:

I have created an instance called input that is of type:

public class TestInput
{
    public int TesTInt { get; set; }
}

我在这个函数中使用它:

I use this in this function:

public static class TestClass
{
    public static string TestFunction()
    {
        var testInput = new TestInput();
        string res = ServicesManager.Execute<string>((object) testInput);

        return res;
    }
}

Execute 函数在这里:

public static OUT Execute<OUT>(object input) 
            where OUT : class
{
       var method = //getting method by reflection
       object[] arr = new object[] { input };
       return method.Invoke(null, arr) as OUT; //Error is triggered here
}

我调用的方法是这个:

public static string TestFunctionProxy(object[] input)
{
       var serviceInput = input[0] as TestInput;
       //rest of code
}

我收到了标题中的错误.(XXX - 测试输入"类型)

I received the error in the title. (XXX - "TestInput" type)

发生了什么以及导致此错误的原因是什么?

What's happening and what is causing this error?

注意:method 是静态的，因此第一个参数不需要实例.如果我错了，请纠正我.

Note: method is static so no instance is required for the first parameter. Please correct me if I'm wrong.

感谢任何帮助.

用一些完整示例的更多代码更新了问题.

Updated the question with some more code for a complete example.