C# 当差异出现在循环中间时如何避免代码重复

Question

目前我有两个这样的函数

GenerateDocumentA(DocumentA docA)
{
    OpenDocumentCode();
    for (int i = 0; i < pageCount; i ++)
    {
        // some common per page code, var page = xxx
        SpecificCodeA(docA, page, i);
    }
    CloseDocumentCode();
}

GenerateDocumentB(DocumentB docB)
{
    OpenDocumentCode();
    for (int i = 0; i < pageCount; i ++)
    {
        // some common per page code, var page = xxx
        SpecificCodeB(docB, page, i);
    }
    CloseDocumentCode();
}

我尝试删除重复代码并看到了这个答案

https://codereview.stackexchange.com/questions/18379/how-to-remove-code-duplication-that-difference-only-a-few-lines

遇到一个问题，我不知道如何将变量从两个地方传递到 SpecificCode()

GenerateDocument(Action SpecificCode)
{
    OpenDocumentCode();
    for (int i = 0; i < pageCount; i ++)
    {
        // some common per page code, var page = xxx
        SpecificCode(); // How to pass the current page / page index
    }
    CloseDocumentCode();
}

GenerateDocumentA(DocumentA docA)
{
    GenerateDocument( () => { } ) // how to also pass the DocumentA docA
}

我的问题是:我如何定义并将 SpecificCode() 传递给 GenerateDocument() 公共(public)代码，知道 SpecificCode() 采用GenerateDocumentA() 和 GenerateDocument() 中的变量作为参数

Answer 1

GenerateDocument(Action<int,int> todo)
{
    OpenDocumentCode();
    for (int i = 0; i < pageCount; i ++)
    {
        // some common per page code, var page = xxx
        todo(page,i);
    }
    CloseDocumentCode();
}

用例:

DocumentA docA;
GenerateDocument((int page, int i)=>
{
    SpecificCodeA(docA, page, i);
});

DocumentB docB;
GenerateDocument((int page, int i)=>
{
    SpecificCodeB(docB, page, i);
});