给自己一点时间接受自己,爱自己，趁着下午茶的时间来学习图老师推荐的DataSet 添加数据集、行、列、主键和外键等操作示例，过去的都会过去，迎接崭新的开始，释放更美好的自己。
【 tulaoshi.com - Web开发 】
前台代码：html
%@ Page language="c#" Codebehind="CodeUse.aspx.cs" AutoEventWireup="false" Inherits="DsAndXML.CodeUse" %
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
HTML
HEAD
titleCodeUse/title
meta content="Microsoft Visual Studio 7.0" name="GENERATOR"
meta content="C#" name="CODE_LANGUAGE"
meta content="JavaScript" name="vs_defaultClientScript"
meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"
/HEAD
body MS_POSITIONING="GridLayout"
form id="CodeUse" method="post" runat="server"
FONT face="宋体"
asp:button id="btnCreate" style="Z-INDEX: 100; LEFT: 31px; POSITION: absolute; TOP: 43px" runat="server" Height="36" Width="130" Text="创建数据集和数据表"/asp:button
asp:Button id="btnUpdateDs" style="Z-INDEX: 117; LEFT: 35px; POSITION: absolute; TOP: 439px" runat="server" Height="36px" Width="131px" Text="赋值"/asp:Button
asp:Label id="Label3" style="Z-INDEX: 112; LEFT: 352px; POSITION: absolute; TOP: 395px" runat="server"列号:/asp:Label
asp:Label id="Label2" style="Z-INDEX: 111; LEFT: 209px; POSITION: absolute; TOP: 395px" runat="server"行号：/asp:Label
asp:Button id="btnUpdateMID" style="Z-INDEX: 107; LEFT: 37px; POSITION: absolute; TOP: 330px" runat="server" Height="36" Width="131" Text="修改MasterID"/asp:Button
asp:Button id="btnAddForeign" style="Z-INDEX: 106; LEFT: 35px; POSITION: absolute; TOP: 278px" runat="server" Height="36" Width="131" Text="添加外键"/asp:Button
asp:Button id="Button1" style="Z-INDEX: 105; LEFT: 31px; POSITION: absolute; TOP: 217px" runat="server" Height="36px" Width="130px" Text="添加唯一键"/asp:Buttonasp:button id="btnAddRow" style="Z-INDEX: 102; LEFT: 31px; POSITION: absolute; TOP: 161px" runat="server" Height="36px" Width="130px" Text="添加行"/asp:buttonasp:button id="btnAddColumn" style="Z-INDEX: 101; LEFT: 31px; POSITION: absolute; TOP: 102px" runat="server" Height="36px" Width="130px" Text="添加列"/asp:buttonasp:datagrid id="dgMaster" style="Z-INDEX: 103; LEFT: 242px; POSITION: absolute; TOP: 40px" runat="server" Height="120px" Width="485px"/asp:datagridasp:datagrid id="dgChild" style="Z-INDEX: 104; LEFT: 240px; POSITION: absolute; TOP: 193px" runat="server" Height="111px" Width="479px"/asp:datagrid
asp:TextBox id="tbRow" style="Z-INDEX: 108; LEFT: 275px; POSITION: absolute; TOP: 395px" runat="server" Width="54px"/asp:TextBox
asp:TextBox id="tbCol" style="Z-INDEX: 109; LEFT: 422px; POSITION: absolute; TOP: 395px" runat="server" Width="64px"/asp:TextBox
asp:Label id="Label1" style="Z-INDEX: 110; LEFT: 520px; POSITION: absolute; TOP: 399px" runat="server"值：/asp:Label
asp:TextBox id="tbResult" style="Z-INDEX: 113; LEFT: 585px; POSITION: absolute; TOP: 394px" runat="server" Width="145px"/asp:TextBox
asp:Label id="Label4" style="Z-INDEX: 114; LEFT: 209px; POSITION: absolute; TOP: 344px" runat="server"表：/asp:Label
asp:DropDownList id="ddlTable" style="Z-INDEX: 115; LEFT: 277px; POSITION: absolute; TOP: 341px" runat="server"
asp:ListItem Value="0"表一/asp:ListItem
asp:ListItem Value="1"表二/asp:ListItem
/asp:DropDownList
asp:Button id="Button2" style="Z-INDEX: 116; LEFT: 35px; POSITION: absolute; TOP: 389px" runat="server" Height="36px" Width="131px" Text="求值"/asp:Button/FONT/form
/body
/HTML
后台代码：cs
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;
namespace DsAndXML
{
/**//// summary
/// CodeUse 的摘要说明。
/// /summary
public class CodeUse : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button btnAddColumn;
protected System.Web.UI.WebControls.Button btnAddRow;
protected System.Web.UI.WebControls.DataGrid dgMaster;
protected System.Web.UI.WebControls.DataGrid dgChild;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.Button btnAddForeign;
protected System.Web.UI.WebControls.Button btnUpdateMID;
protected System.Web.UI.WebControls.TextBox tbRow;
protected System.Web.UI.WebControls.TextBox tbCol;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.Label Label2;
protected System.Web.UI.WebControls.Label Label3;
protected System.Web.UI.WebControls.TextBox tbResult;
protected System.Web.UI.WebControls.Label Label4;
protected System.Web.UI.WebControls.DropDownList ddlTable;
protected System.Web.UI.WebControls.Button Button2;
protected System.Web.UI.WebControls.Button btnUpdateDs;
protected System.Web.UI.WebControls.Button btnCreate;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
}
Web Form Designer generated code#region Web Form Designer generated code
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.btnCreate.Click += new System.EventHandler(this.btnCreate_Click);
this.btnAddRow.Click += new System.EventHandler(this.btnAddRow_Click);
this.btnAddColumn.Click += new System.EventHandler(this.btnAddColumn_Click);
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.btnAddForeign.Click += new System.EventHandler(this.btnAddForeign_Click);
this.btnUpdateMID.Click += new System.EventHandler(this.btnUpdateMID_Click);
this.Button2.Click += new System.EventHandler(this.Button2_Click);
this.btnUpdateDs.Click += new System.EventHandler(this.btnUpdateDs_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void btnCreate_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = new DataSet("myDS");//创建数据集
DataTable dtMaster = new DataTable("Master");//创建数据表
DataTable dtChild = new DataTable("Child");
dsUntyped.Tables.Add(dtMaster);//把数据表添加到数据集中
dsUntyped.Tables.Add(dtChild);
Session["ds"] = dsUntyped;
}
private void btnAddColumn_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
dsUntyped.Tables["Master"].Columns.Add("MasterID",typeof(int));
dsUntyped.Tables["Master"].Columns.Add("MasterValue",typeof(string));
dsUntyped.Tables["Child"].Columns.Add("MasterLink",typeof(int));
dsUntyped.Tables["Child"].Columns.Add("ChildID",typeof(int));
dsUntyped.Tables["Child"].Columns .Add("ChildValue",typeof(string));
//修改表头
dsUntyped.Tables["Master"].Columns["MasterID"].Caption = "主ID";
dsUntyped.Tables["Master"].Columns["MasterValue"].Caption = "值";
Session["ds"] = dsUntyped;
Bind();
}
private void btnAddRow_Click(object sender, System.EventArgs e)
{
try
{
DataSet dsUntyped = (DataSet)Session["ds"];
//为Master表添加两行
DataRow dr = dsUntyped.Tables["Master"].NewRow();
dr["MasterID"] = 1;
dr["MasterValue"] = "One";
dsUntyped.Tables["Master"].Rows.Add(dr);
dr = dsUntyped.Tables["Master"].NewRow();
dr["MasterID"] = 2;
dr["MasterValue"] = "Two";
dsUntyped.Tables["Master"].Rows.Add(dr);
//为child表添加1行
dr = dsUntyped.Tables["Child"].NewRow();
dr["MasterLink"] = 1;
dr["ChildID"] = 1;
dr["ChildValue"] = "ChildOne";
dsUntyped.Tables["Child"].Rows.Add(dr);
Session["ds"] = dsUntyped;
Bind();
}
catch(Exception ee)
{
Response.Write(ee.Message);
}
}
//添加唯一键
private void Button1_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
System.Data.UniqueConstraint uc = new UniqueConstraint("unqi",dsUntyped.Tables["Master"].Columns["MasterID"]);
dsUntyped.Tables["Master"].Constraints.Add(uc);
Session["ds"] = dsUntyped;
}
private void Bind()
{
DataSet dsUntyped = (DataSet)Session["ds"];
dgMaster.DataSource = dsUntyped.Tables["Master"].DefaultView;
dgChild.DataSource = dsUntyped.Tables["Child"].DefaultView;
this.DataBind();
}
private void btnAddForeign_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
System.Data.ForeignKeyConstraint fc = new ForeignKeyConstraint("fc",dsUntyped.Tables["Master"].Columns["MasterID"],dsUntyped.Tables["Child"].Columns["MasterLink"]);
dsUntyped.Tables["Child"].Constraints.Add(fc);
Session["ds"] = dsUntyped;
}
private void btnUpdateMID_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
dsUntyped.Tables["Master"].Rows[0]["MasterID"] = 4;
Bind();
}
private void Button2_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
int nIndexTb = int.Parse(ddlTable.SelectedItem.Value);
int nIndexRow = int.Parse(tbRow.Text);
int nIndexCol = int.Parse(tbCol.Text);
object obj = dsUntyped.Tables[nIndexTb].Rows[nIndexRow][nIndexCol];
tbResult.Text = obj.ToString();
}
private void btnUpdateDs_Click(object sender, System.EventArgs e)
{
DataSet dsUntyped = (DataSet)Session["ds"];
int nIndexTb = int.Parse(ddlTable.SelectedItem.Value);
int nIndexRow = int.Parse(tbRow.Text);
int nIndexCol = int.Parse(tbCol.Text);
dsUntyped.Tables[nIndexTb].Rows[nIndexRow][nIndexCol] = tbResult.Text;
Session["ds"] = dsUntyped;
Bind();
}
}
}如何把利用DataSet的GetXml()方法获得的字符串再转成DataSet对象
DataSet ds = db.ExecSqlForDataSet( strSQL );
string strDS = ds.GetXml();
//如何把strDS转换成DataSet对象？？
--------------------------------------------------------------------------------
String strDS = ""
System.IO.StringReader reader = new System.IO.StringReader(strDS);
ds.ReadXml(reader);
reader.Close();
http://www.cnblogs.com/skylaugh/archive/2006/12/18/595646.html
来源:https://www.tulaoshi.com/n/20160219/1627308.html
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