foreach代码如何改造成递归

2010-12-02 10:00:43 272 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

尾递归的概念？递归的优化？循环语句？本文系统梳理了编程中的循环语句特性，从递归原理到各类循环实现，涵盖while、for、do-while等基本结构，以及尾递归优化、无限循环等特殊场景。对比分析了C/C++、Java、Python等语言对循环语句的支持差异，特别介绍了Kotlin的tailrec修饰符、Swift的repeat-while替代方案等特色语法。文章还深入探讨了循环控制语句(break/continue)、循环优化技术(并行执行)、返回值机制等进阶话题，并回顾了Fortran等早期语言的循环设计。通过多语言横向比较，展现了编程语言阅读详情

下面代码如何改造成递归的方式





                List<RibbonPageGroup> rpgList = null;

                List<BarButtonItem> bbbiList = null;

                List<RibbonPage> rpList = new List<RibbonPage>();

                foreach (XmlNode xnRibbonPage in nodeList)

                {

                    rpgList = new List<RibbonPageGroup>();

                    foreach (XmlNode xnRibbonPageGroup in xnRibbonPage.ChildNodes)

                    {

                        bbbiList = new List<BarButtonItem>();

                        foreach (XmlNode xnBarButtonItem in xnRibbonPageGroup.ChildNodes)

                        {

                            BarButtonItem bbbii = new BarButtonItem();

                            bbbii.Name = xnBarButtonItem.Attributes["Name"].Value;

                            bbbii.Caption = xnBarButtonItem.Attributes["Caption"].Value;

                            bbbii.Description = xnBarButtonItem.Attributes["NameSpace"].Value;

                            bbbii.ItemClick += new ItemClickEventHandler(BarButtonItem_ItemClick);

                            bbbiList.Add(bbbii);

                        }

                        RibbonPageGroup rpg = new RibbonPageGroup();

                        rpg.Text = xnRibbonPageGroup.Attributes["Text"].Value;

                        rpg.ShowCaptionButton = false;

                        rpg.ItemLinks.AddRange(bbbiList.ToArray());

                        rpgList.Add(rpg);

                    }

                    if (xnRibbonPage.Attributes["Text"].Value != "系统管理")

                    {

                        RibbonPage rp = new RibbonPage();

                        rp.Text = xnRibbonPage.Attributes["Text"].Value;

                        rp.MergedGroups.AddRange(rpgList.ToArray());

                        rpList.Add(rp);

                    }

                    else

                    {

                        rp1.MergedGroups.Add(rpgList[rpgList.Count - 1]);

                        rpList.Add(rp1);

                    }

                }

                if (rp1.MergedGroups.Count == 1)

                    rpList.Add(rp1);

                ribbon.Pages.AddRange(rpList.ToArray());

                ribbon.ItemsVertAlign = DevExpress.Utils.VertAlignment.Top;

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accpchenjun

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flyerwing 2010-12-02

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没能过,这个.

accpchenjun 2010-12-02

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下面是我的完整代码
如何改造成XMLTextReader读数据+递归



XmlDocument xd = new XmlDocument();

                XmlReaderSettings settings = new XmlReaderSettings();

                settings.IgnoreComments = true;

                XmlReader reader = null;

                XmlNodeList nodeList;

                if (SessionManager.Session["Psn_IsAdmin"].ToString() != "True")

                {

                    string userconfig = string.Format("{0}PermissionsMenuList.config", SessionManager.Session["Psn_ID"]);

                    reader = XmlReader.Create(userconfig, settings);

                    xd.Load(reader);

                    nodeList = xd.SelectSingleNode("Ribbon").ChildNodes;

                }

                else

                {

                    reader = XmlReader.Create("AdminMenuList.config", settings);

                    xd.Load(reader);

                    nodeList = xd.SelectSingleNode("Ribbon").ChildNodes;

                }

List<RibbonPageGroup> rpgList = null;

                List<BarButtonItem> bbbiList = null;

                List<RibbonPage> rpList = new List<RibbonPage>();

                foreach (XmlNode xnRibbonPage in nodeList)

                {

                    rpgList = new List<RibbonPageGroup>();

                    foreach (XmlNode xnRibbonPageGroup in xnRibbonPage.ChildNodes)

                    {

                        bbbiList = new List<BarButtonItem>();

                        foreach (XmlNode xnBarButtonItem in xnRibbonPageGroup.ChildNodes)

                        {

                            BarButtonItem bbbii = new BarButtonItem();

                            bbbii.Name = xnBarButtonItem.Attributes["Name"].Value;

                            bbbii.Caption = xnBarButtonItem.Attributes["Caption"].Value;

                            bbbii.Description = xnBarButtonItem.Attributes["NameSpace"].Value;

                            bbbii.ItemClick += new ItemClickEventHandler(BarButtonItem_ItemClick);

                            bbbiList.Add(bbbii);

                        }

                        RibbonPageGroup rpg = new RibbonPageGroup();

                        rpg.Text = xnRibbonPageGroup.Attributes["Text"].Value;

                        rpg.ShowCaptionButton = false;

                        rpg.ItemLinks.AddRange(bbbiList.ToArray());

                        rpgList.Add(rpg);

                    }

                    if (xnRibbonPage.Attributes["Text"].Value != "系统管理")

                    {

                        RibbonPage rp = new RibbonPage();

                        rp.Text = xnRibbonPage.Attributes["Text"].Value;

                        rp.MergedGroups.AddRange(rpgList.ToArray());

                        rpList.Add(rp);

                    }

                    else

                    {

                        rp1.MergedGroups.Add(rpgList[rpgList.Count - 1]);

                        rpList.Add(rp1);

                    }

                }

                if (rp1.MergedGroups.Count == 1)

                    rpList.Add(rp1);

                ribbon.Pages.AddRange(rpList.ToArray());

                ribbon.ItemsVertAlign = DevExpress.Utils.VertAlignment.Top;

accpchenjun 2010-12-02

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[Quote=引用 1 楼 pittroll 的回复:]

为甚要改成递归
[/Quote]
我想测试一下多层嵌套好递归那个效率高

luozhongxian001 2010-12-02

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这是我以前做的一个案例你可以参考下：
public void AddTree(int ParentID, TreeNode pNode, TreeView treeView, DataTable dt)
{
DataView dvTree = new DataView(dt);
dvTree.RowFilter = "[ForceID]=" + ParentID;
foreach (DataRowView Row in dvTree)
{
TreeNode Node = new TreeNode();
if (pNode == null)
{ //添加根节点
Node.Text = Row["ConText"].ToString();
treeView.Nodes.Add(Node);
Node.Expanded = true;
AddTree(Int32.Parse(Row["ID"].ToString()), Node, treeView, dt); //再次递归
}
else
{ //̀添加当前节点的子节点
Node.Text = Row["ForceName"].ToString();
pNode.Nodes.Add(Node);
Node.Expanded = true;
AddTree(Int32.Parse(Row["ID"].ToString()), Node, treeView, dt); //再次递归
}
}
}

luozhongxian001 2010-12-02

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foreach (XmlNode xnBarButtonItem in xnRibbonPageGroup.ChildNodes)
{
BarButtonItem bbbii = new BarButtonItem();
bbbii.Name = xnBarButtonItem.Attributes["Name"].Value;
bbbii.Caption = xnBarButtonItem.Attributes["Caption"].Value;
bbbii.Description = xnBarButtonItem.Attributes["NameSpace"].Value;
bbbii.ItemClick += new ItemClickEventHandler(BarButtonItem_ItemClick);
bbbiList.Add(bbbii);
}
该成回调自身函数即可！

PitTroll 2010-12-02

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为甚要改成递归

colorall 2010-12-02

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递归简单易懂，但很耗资源。特别递归层次得多的时候，一般PC是承受不了了。

PitTroll 2010-12-02

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[Quote=引用 4 楼 accpchenjun 的回复:]
引用 1 楼 pittroll 的回复:

为甚要改成递归

我想测试一下多层嵌套好递归那个效率高
[/Quote]
递归容易导致内存泄露，以前我测试递归1W层的时候，内存就受不了啦。

foreach代码如何改造成递归

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