***********如何操作web.config的<add key="" value=""/>我想动态添加一个!不知道怎么做*************答对了马上给分

ms-help://MS.MSDNQTR.2003FEB.2052/cpref/html/frlrfsystemxmlxmlnodeclassappendchildtopic.htm

我的思路：用编程方法对web。config文件进行读写操作

其实就是对xml文档的读写

或者你可以看一下
MS 的EnLib 内的 ConfigrationBlock 部分

XmlDocument xDoc=new XmlDocument();
xDoc.Load(Server.MapPath("web.config")); XmlElement elem=xDoc.CreateElement("add"); XmlAttribute attrib=xDoc.CreateAttribute("key"); attrib.Value="ConnectionStrings";
elem.Attributes.Append(attrib); attrib=xDoc.CreateAttribute("value");
attrib.Value="data source=(local)";
elem.Attributes.Append(attrib);
xDoc.DocumentElement.ChildNodes[0].AppendChild(elem);
xDoc.Save(Server.MapPath("web.config"));
不过要注意,要让用户对WEB.CONFIG所在的文件夹有写的权限.

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;namespace 易网科技.Admin.Article
{
/// <summary>
/// ArticleInfo 的摘要说明。
/// </summary>
public class ArticleInfo : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataList DataList1;
protected System.Web.UI.WebControls.CheckBox Single;
　　protected DataOperation DataOP=new DataOperation();
protected int Records;//记录数
protected int TotalPage;//总页数
protected int CurrentPage;//当前页
protected int PageSize=Int32.Parse(ConfigurationSettings.AppSettings["PageSize"]);//每页记录数,此信息在Web.Config中
protected DataSet ds;
protected bool bPre,bNext;//是否启用
protected string sPre,sNext;
protected System.Web.UI.WebControls.Label Label1;
protected CheckBox Full;//全选框
protected Button Delete;//删除确认对话框　
private void Page_Load(object sender, System.EventArgs e)
{
if(!this.IsPostBack)
{
if(Request["Page"]==null)
{
CurrentPage=1;

}
else
{
try
{
CurrentPage=Convert.ToInt32(Request["Page"]); }
catch
{
CurrentPage=1;
}
}

if(CurrentPage>0)
{
sPre="ArticleInfo.aspx?Page="+Convert.ToString(CurrentPage-1);//上一页
sNext="ArticleInfo.aspx?Page="+Convert.ToString(CurrentPage+1);//下一页
if(CurrentPage==1)
{
bPre=false;

}
else
{
bPre=true;

}
ds=DataOP.GetArticleData(CurrentPage,PageSize,out Records,out TotalPage);
if(CurrentPage==TotalPage)
{
bNext=false;
}
else
{
bNext=true;
}
DataList1.DataSource=ds;
DataList1.DataBind();
}
}
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataList1.ItemCreated += new System.Web.UI.WebControls.DataListItemEventHandler(this.DataList1_ItemCreated_1);
this.DataList1.PreRender += new System.EventHandler(this.DataList1_PreRender_1);
this.DataList1.UpdateCommand += new System.Web.UI.WebControls.DataListCommandEventHandler(this.DataList1_UpdateCommand);
this.DataList1.DeleteCommand += new System.Web.UI.WebControls.DataListCommandEventHandler(this.DataList1_DeleteCommand);
this.DataList1.ItemDataBound += new System.Web.UI.WebControls.DataListItemEventHandler(this.DataList1_ItemDataBound_1);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void DataList1_ItemCreated_1(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
{
Full=(CheckBox)e.Item.FindControl("CheckBox1");
//用户单击后弹出确认框
Delete=(Button)e.Item.FindControl("Button1");
}

//因为数据库里保存的为数字，这里须要替换显示
private void DataList1_ItemDataBound_1(object sender, System.Web.UI.WebControls.DataListItemEventArgs e)
{
if(e.Item.ItemIndex>-1)
{
int id,dl,xl,sh;
id=Convert.ToInt32(ds.Tables[0].Rows[e.Item.ItemIndex]["cplbid"]);
dl=Convert.ToInt32(ds.Tables[0].Rows[e.Item.ItemIndex]["dlid"]);
xl=Convert.ToInt32(ds.Tables[0].Rows[e.Item.ItemIndex]["xlid"]);
sh=Convert.ToInt32(ds.Tables[0].Rows[e.Item.ItemIndex]["sh"]);
Label Id=(Label)e.Item.FindControl("Label5");
Label BigClass=(Label)e.Item.FindControl("Label2");
Label SmallClass=(Label)e.Item.FindControl("Label3");
Label Pass=(Label)e.Item.FindControl("Label4");
Id.Text=id.ToString();
BigClass.Text=DataOP.GetBigClassName(dl);
SmallClass.Text=DataOP.GetSmallClassName(xl);
if(sh==1)
Pass.Text="未通过";
else
Pass.Text="通过";
}

} private void DataList1_PreRender_1(object sender, System.EventArgs e)
{
Delete.Attributes.Add("onClick","javascrip:return confirm('删除后不可恢复!你真的确定吗?');");
if(Full.Checked)
{
for (int i = 0; i < DataList1.Items.Count; i++)
{
CheckBox chk = (CheckBox)DataList1.Items[i].FindControl("CheckBox2");
chk.Checked=true;
}
}
else
{
for (int i = 0; i < DataList1.Items.Count; i++)
{
CheckBox chk = (CheckBox)DataList1.Items[i].FindControl("CheckBox2");
chk.Checked=false;
}
}
} private void DataList1_DeleteCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
{
ArrayList AllId=new ArrayList();
for (int i = 0; i < DataList1.Items.Count; i++)
{
CheckBox chk = (CheckBox)DataList1.Items[i].FindControl("CheckBox2");
if(chk.Checked==true)
{
Label id=(Label)this.DataList1.Items[i].FindControl("Label5");
int Aid=Int32.Parse(id.Text);
AllId.Add(Aid);
}
}
if(DataOP.DeleteArticle(AllId)==false)
{
Response.Write("<font color=#ffoooo>删除失败....</font><a href=../AdminMG.aspx>请返回</a>");
}
else
{
Response.Redirect("ArticleInfo.aspx");
}
} private void DataList1_UpdateCommand(object source, System.Web.UI.WebControls.DataListCommandEventArgs e)
{
ArrayList AllId=new ArrayList();
for (int i = 0; i < DataList1.Items.Count; i++)
{
CheckBox chk = (CheckBox)DataList1.Items[i].FindControl("CheckBox2");
if(chk.Checked==true)
{
Label id=(Label)this.DataList1.Items[i].FindControl("Label5");
int Aid=Int32.Parse(id.Text);
AllId.Add(Aid);

}
}
if(DataOP.PassArticle(AllId)==false)
{
Response.Write("<font color=#ffoooo>审核失败....</font><a href=ArticleInfo.aspx>请返回</a>");
}
else
{
Response.Redirect("ArticleInfo.aspx");
}
}
}
}

public enum   ConfigFileType
{
WebConfig ,
AppConfig
} public class AppConfig : System.Configuration.AppSettingsReader
{
public string  docName = String.Empty;
private  XmlNode node=null; private int _configType; public   int ConfigType
{
get
{
return _configType;
}
set
{
_configType=value;
}
} public bool SetValue(string key, string value)
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// 返回appSettings节点
node =  cfgDoc.SelectSingleNode("//appSettings");

if( node == null )
{
throw new System.InvalidOperationException( "appSettings section not found");
}

try
{
// 先择key
XmlElement addElem= (XmlElement)node.SelectSingleNode("//add[@key='" +key +"']") ;
if (addElem!=null)
{
addElem.SetAttribute("value",value);
}
// 找不到，则添加key与value
else
{
XmlElement entry = cfgDoc.CreateElement("add");
entry.SetAttribute("key",key);
entry.SetAttribute("value",value);
node.AppendChild(entry);
}
//保存
saveConfigDoc(cfgDoc,docName);
return true;
}
catch
{
return false;
}
}

private void saveConfigDoc(XmlDocument cfgDoc,string cfgDocPath)
{
try
{
XmlTextWriter writer = new XmlTextWriter( cfgDocPath , null );
writer.Formatting = Formatting.Indented;
cfgDoc.WriteTo( writer );
writer.Flush();
writer.Close();
return;
}
catch
{
throw;
}
}

public bool removeElement ( string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// 返回appSettings Node
node =  cfgDoc.SelectSingleNode("//appSettings");
if( node == null )
{
throw new System.InvalidOperationException( "appSettings section not found");
}
// 移除所选
node.RemoveChild( node.SelectSingleNode("//add[@key='" +elementKey +"']") );

saveConfigDoc(cfgDoc,docName);
return true;
}
catch
{
return false;
}
}
private XmlDocument loadConfigDoc( XmlDocument cfgDoc )
{
//加载文件
if(  Convert.ToInt32(ConfigType)==Convert.ToInt32(ConfigFileType.AppConfig))
{

docName= ((Assembly.GetEntryAssembly()).GetName()).Name;
docName +=   ".exe.config";
}
else
{
docName=System.Web.HttpContext.Current.Server.MapPath("../../web.config");
}
cfgDoc.Load( docName );
return cfgDoc;
} }

调试易

*如何操作web.config的<add key="" value=""/>我想动态添加一个!不知道怎么做***答对了马上给分

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