在项目开发中,我们经常会对某张表进行增删改查。我们根据条件刷选表中的数据放到gridview中以列表形式展现,同时给gridview添加各种样式,比如一般必用的鼠标经过,鼠标离开颜色变化,行选中等颜色加深,同时给列表数据项赋值,单击保存按钮可以修改一条已存在的数据或者添加一条新的数据,单击按钮添加,列表数据项清空,单击删除,可以删除一条数据。
由于为了方便大家把代码复制一下,在脱离数据的情况下,就可以看到效果,所以,我把数据存放在xml,所以读取数据不是通过数据库,是通过跟xml文件交互实现的。所以做了下面对xml增删改查页面。
效果图:
首先列出XML文件,方便代码参照
内容.xml
<?xml version="1.0" encoding="utf-8"?> <config> <Header ID="ID" class="class" class_name="class_name" year="year" school="school" count="count"> </Header> <rows ID="01" class="一五班" class_name="实验班" year="2013" school="三峡高级中学" count="30"> </rows> <rows ID="02" class="一六班" class_name="奥数班" year="2013" school="三峡高级中学" count="45"> </rows> <rows ID="03" class="一七班" class_name="阳光班" year="2013" school="三峡高级中学" count="60"> </rows> <rows ID="04" class="一八班" class_name="美术班" year="2013" school="三峡高级中学" count="75"> </rows> </config>
一,核心代码:
1) 修改xml
/// <summary> /// 修改XML /// </summary> /// <param name="xmlName">XML文件名</param> /// <param name="ht">存放信息哈希表</param> /// <param name="ID">主键值</param> public void saveXML(string xmlName,Hashtable ht,string ID) { string fileName=HttpContext.Current.Request.PhysicalApplicationPath+"\\Xml\\"+xmlName+".xml";//xml的物理路径 XmlDocument xmlDoc=new XmlDocument (); xmlDoc.Load(fileName); XmlNode node = xmlDoc.SelectSingleNode("config/rows[@ID=" + ID + "]"); foreach (XmlNode node1 in node.Attributes) { if (ht.ContainsKey(node1.Name)&&node1.Name!="ID") { node1.Value = ht[node1.Name].ToString(); } } xmlDoc.Save(fileName); }
ht:
Hashtable ht = new Hashtable(); ht.Add("ID", this.txt_ID.Value); ht.Add("class", this.txt_class.Value); ht.Add("class_name", this.txt_class_name.Value); ht.Add("year", this.txt_year.Value); ht.Add("school", this.txt_school.Value); ht.Add("count", this.txt_count.Value);
/// <summary> /// 插入xml /// </summary> /// <param name="xmlName">XML文件名</param> /// <param name="ht">存放信息哈希表</param> /// <returns></returns> public string insertXml(string xmlName, Hashtable ht) { string fileName = HttpContext.Current.Request.PhysicalApplicationPath + "\\Xml\\" + xmlName + ".xml";//xml的物理路径 XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(fileName); XmlNode node = xmlDoc.SelectSingleNode("//rows[last()]");//最后一个行节点 XmlNode MaxNode = xmlDoc.SelectSingleNode("//rows/@ID[not(.<//rows/@ID)]");//获取主键最大值 if (int.Parse(ht[MaxNode.Name].ToString()) <= int.Parse(MaxNode.Value))//如果小于主键最大值,那么返回- { return "-1"; } XmlElement xe = xmlDoc.CreateElement("rows"); xe.InnerText = ""; foreach (XmlNode node1 in node.Attributes) { if (ht.ContainsKey(node1.Name)) { xe.SetAttribute(node1.Name, ht[node1.Name].ToString()); } else { xe.SetAttribute(node1.Name,""); } } node.ParentNode.AppendChild(xe); xmlDoc.Save(fileName); return "1"; }
3) 删除xml
/// <summary> /// 删除xml节点 /// </summary> /// <param name="xmlName">XML文件名</param> /// <param name="ID">主键值</param> /// <param name="primaryKey">主键名</param> /// <returns></returns> public string deleteXml(string xmlName,string ID,string primaryKey) { string rtn = string.Empty; string fileName = HttpContext.Current.Request.PhysicalApplicationPath + "\\Xml\\" + xmlName + ".xml";//xml的物理路径 XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(fileName); XmlNode node = xmlDoc.SelectSingleNode("//rows[@"+primaryKey+"='"+ID+"']");//最后一个行节点 if (node ==null) { rtn = "-1"; } else { node.ParentNode.RemoveChild(node); rtn = "1"; } xmlDoc.Save(fileName); return rtn; }
如果是看具体的实现代码,可以下载:
http://download.csdn.net/detail/yucihai/6641293