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DataSet 添加数据集、行、列、主键和外键等操作示例

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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>
        <title>CodeUse</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:Button><asp:button id="btnAddRow" style="Z-INDEX: 102; LEFT: 31px; POSITION: absolute; TOP: 161px" runat="server" Height="36px" Width="130px" Text="添加行"></asp:button><asp:button id="btnAddColumn" style="Z-INDEX: 101; LEFT: 31px; POSITION: absolute; TOP: 102px" runat="server" Height="36px" Width="130px" Text="添加列"></asp:button><asp:datagrid id="dgMaster" style="Z-INDEX: 103; LEFT: 242px; POSITION: absolute; TOP: 40px" runat="server" Height="120px" Width="485px"></asp:datagrid><asp: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

        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();

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