C# Get.Type() 回传NULL问题

我想去抓取Class的function 然后在执行该function
ClassName 跟 FunctionName 都有正常传入值
目前 Type type = Type.GetType(ClassName); <= type = null
请问有哪个部分有问题 或有甚么方法可以抓到该class内的function
class 跟 function NAME 都是传入的

string ClassName = "TestQuartz";string FunctionName = "Test1";public class JobExecute : IJob{    public async Task Execute(IJobExecutionContext context)    {        var dataMap = context.JobDetail.JobDataMap;        string ClassName = dataMap["ClassName"].ToString();        string FunctionName = dataMap["FunctionName"].ToString();        Type type = Type.GetType(ClassName);        MethodInfo method = type.GetMethod(FunctionName);        object obj = Activator.CreateInstance(type);        await Task.Run(() =>        {            method.Invoke(obj, null);        });    }}public class TestQuartz{    public void Test1()    {        Console.WriteLine("Hello Quartz: Test1");    }    public void Test2()    {        Console.WriteLine("Hello Quartz: Test2");    }}