asp.net 的 Datatable 使用，asp.net c# Datatable 创建 修改 查询 更新 提交 AcceptChanges Select Rows.Add(row)

有时需要在内存中创建一个临时表，用以实现特殊的显示和查询要求，而Datatable 就是经常用到的一个工具，以下是本人的一些测试代码，实现了Datatable的动态创建和查询、修改，由于时间仓促，写得比较乱，不过懂asp.net 和 C#的应该也能看懂，凑合着看吧，希望对大家有所帮助。

 using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Datatable : System.Web.UI.Page
{

    protected DataTable dtYxzt;
    protected DataRow row;
    protected DataRow[] rows;
    private bool IsExist(int id1, int id2)
    {      
        rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
        if (rows.Length > 0)
            return true ;
        else
            return false;
    }
    protected void Page_Load(object sender, EventArgs e)
    {

        Int16 id1, id2;
        dtYxzt = new DataTable(“yxzt”);
        dtYxzt.Columns.Add(“id1”, typeof(Int16));
        dtYxzt.Columns.Add(“id2”, typeof(Int16));
        dtYxzt.Columns.Add(“sglx”, typeof(string));
        dtYxzt.Columns.Add(“cb”, typeof(string));
        dtYxzt.Columns.Add(“wsg”, typeof(Int32));
        dtYxzt.Columns.Add(“zzsg”, typeof(Int32));
        dtYxzt.Columns.Add(“sgwc”, typeof(Int32));

        row = dtYxzt.NewRow();
        row[“id1”] = 1;
        row[“id2”] = 1;
        row[“sglx”] = “新井射孔”;
        row[“cb”] = “采油二厂”;
        row[“wsg”] = 66;
        row[“zzsg”] = 66;
        row[“sgwc”] = 66;
        dtYxzt.Rows.Add(row);
        row = dtYxzt.NewRow();
        row[“id1”] = 1;
        row[“id2”] = 2;
        row[“sglx”] = “新井射孔2”;
        row[“cb”] = “采油二厂2”;
        row[“wsg”] = 66;
        row[“zzsg”] = 66;
        row[“sgwc”] = 66;
        dtYxzt.Rows.Add(row);
        row = dtYxzt.NewRow();
        row[“id1”] = 1;
        row[“id2”] = 3;
        row[“sglx”] = “新井射孔3”;
        row[“cb”] = “采油二厂3”;
        row[“wsg”] = 66;
        row[“zzsg”] = 66;
        row[“sgwc”] = 66;
        dtYxzt.Rows.Add(row);
        dtYxzt.AcceptChanges();      

        id1 = 1;
        id2 = 1;
        rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
        Response.Write(“<br>(1,1)first:” + rows[0][“wsg”].ToString() + “<br>”);
        id1 = 1;
        id2 = 4;
        if (!IsExist(id1, id2))
        {

            row = dtYxzt.NewRow();
            row[“id1”] = 1;
            row[“id2”] = 4;
            row[“sglx”] = “新井射孔4”;
            row[“cb”] = “采油二厂4”;
            row[“wsg”] = 66;
            row[“zzsg”] = 66;
            row[“sgwc”] = 66;
            dtYxzt.Rows.Add(row);
           
        }
        else
        {

            rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
            rows[0][“wsg”] = 77;
        }      
        dtYxzt.AcceptChanges();
        rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
        Response.Write(“<br>new(1,4)” + rows[0][“wsg”].ToString() + “<br>”);

        id1 = 1;
        id2 = 1;      
        if (!IsExist(id1, id2))
        {

            row = dtYxzt.NewRow();
            row[“id1”] = 1;
            row[“id2”] = 4;
            row[“sglx”] = “新井射孔4”;
            row[“cb”] = “采油二厂4”;
            row[“wsg”] = 66;
            row[“zzsg”] = 66;
            row[“sgwc”] = 66;
            dtYxzt.Rows.Add(row);

        }
        else
        {

            rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
            rows[0][“wsg”] = 77;
        }
        dtYxzt.AcceptChanges();
        rows = dtYxzt.Select(“id1=” + id1 + ” and id2=” + id2);
        Response.Write(“<br>更新(1,1)” + rows[0][“wsg”].ToString() + “<br>”);
        this.DataGrid1.DataSource = dtYxzt;
        this.DataBind();
    }
}

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