嵌套using语句的最佳实践？ [英] Best practice for nested using statements?

问题描述

我有一个如下的代码块，并且我正在使用3个嵌套的 using 块。

I have a code block as follows and I'm using 3 nested using blocks.

我发现最终使用 try 块可以避免这种情况，但是如果有两个以上using语句，那最好的方法是什么？

I found that using try finally blocks I can avoid this but if there are more than two using statements, what is the best approach?

private FileStream fileStream = null;
private Document document = null;
private PdfWriter pdfWriter =  null;

using (fileStream = new FileStream("ABC.pdf", FileMode.Create))
{
    using (document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom))
    {
        using (pdfWriter = PdfWriter.GetInstance(document, fileStream))
        {
            document.AddAuthor(metaInformation["author"]);
            document.AddCreator(metaInformation["creator"]);
            document.AddKeywords("Report Generation using I Text");
            document.AddSubject("Document subject");
            document.AddTitle("The document title");
        }
    }
}

推荐答案

您可以通过以下方式删除缩进和大括号：

You can remove the indention and curly brackets this way:

using (var fileStream = new FileStream("ABC.pdf", FileMode.Create))
using (var document = new Document(PageSize.A4, marginLeft, marginRight, marginTop, marginBottom))
using (var pdfWriter = PdfWriter.GetInstance(document, fileStream))
{
   // code
}

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