C＃非空字段：Lateinit？

我想知道如何在具有可空引用类型的C＃中使用后期初始化的类字段。 想象一下以下课程：

public class PdfCreator { 

   private PdfDoc doc;

   public void Create(FileInfo outputFile) {
       doc = new PdfWriter(outputFile);
       Start();
   }

   public void Create(FileInfo outputFile) {
       doc = new PdfWriter(outputFile);
       Start();
   }

   private void Start() {
      Method1();
      // ...
      MethodN();
   }

   private void Method1() {
      // Work with doc
   }

   // ...

   private void MethodN() {
      // Work with doc
   }
}

The above code is very simplified. My real class uses many more fields like doc and also has some constructors with some arguments.

Using the above code, I get a compiler warning on the constructor, that doc is not initialized, which is correct. I could solve this by setting the type of doc to PdfDoc?, but then I have to use ?. or !. everywhere it is used, which is nasty.

I could also pass doc as a parameter to each method, but remember that I have some fields like this and this violates the clean code principle in my eyes.

I am looking for a way to tell the compiler, that I will initialize doc before using it (actually I do it, there is no possibility for the caller to get a null reference exception!). I think Kotlin has the lateinit modifier exactly for this purpose.

您将如何在“干净的” C＃代码中解决此问题？