DataSet 添加数据集、行、列、主键和外键等操作示(2)

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();
        }
    }
}