• 每日日报2021.3.31


    今天完成内容:

    学习andriod GridView

     11.GridView实现用“...”代替超长字符串:

    for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                DataRowView mydrv;
                string gIntro;
                if (GridView1.PageIndex == 0)
                {
                    mydrv = myds.Tables["飞狐工作室"].DefaultView[i];//表名
                    gIntro = Convert.ToString(mydrv["家庭住址"]);//所要处理的字段
                    GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
                }
                else
                {
                    mydrv = myds.Tables["飞狐工作室"].DefaultView[i + (5 * GridView1.PageIndex)];
                    gIntro = Convert.ToString(mydrv["家庭住址"]);
                    GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
                }
            } 

    public string SubStr(string sString, int nLeng)
        {
            if (sString.Length <= nLeng)
            {
                return sString;
            }
            string sNewStr = sString.Substring(0, nLeng);
            sNewStr = sNewStr + "...";
            return sNewStr;
        }

    using System;
    using System.Data;
    using System.Configuration;
    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;
    using System.Data.SqlClient;

    public partial class _Default : System.Web.UI.Page 
    {
        SqlConnection sqlcon;
        SqlCommand sqlcom;
        string strCon = "Data Source=(local);Database=北风贸易;Uid=sa;Pwd=sa";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ViewState["SortOrder"] = "身份证号码";
                ViewState["OrderDire"] = "ASC";
                bind();
            }
        }
        protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
        {
            GridView1.EditIndex = e.NewEditIndex;
            bind();
        }
        protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string sqlstr = "delete from 飞狐工作室 where 身份证号码='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
            sqlcon = new SqlConnection(strCon);
            sqlcom = new SqlCommand(sqlstr,sqlcon);
            sqlcon.Open();
            sqlcom.ExecuteNonQuery();
            sqlcon.Close();
            bind();
        }
        protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
        {
            sqlcon = new SqlConnection(strCon);
            string sqlstr = "update 飞狐工作室 set 姓名='"
                + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[1].Controls[0])).Text.ToString().Trim() + "',家庭住址='"
                + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where 身份证号码='" 
                + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'";
            sqlcom=new SqlCommand(sqlstr,sqlcon);
            sqlcon.Open();
            sqlcom.ExecuteNonQuery();
            sqlcon.Close();
            GridView1.EditIndex = -1;
            bind();
        }
        protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
        {
            GridView1.EditIndex = -1;
            bind();
        }
        public void bind()
        {
            string sqlstr = "select top 5 * from 飞狐工作室";
            sqlcon = new SqlConnection(strCon);
            SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
            DataSet myds = new DataSet();
            sqlcon.Open();
            myda.Fill(myds, "飞狐工作室");
            GridView1.DataSource = myds;
            GridView1.DataKeyNames = new string[] { "身份证号码" };
            GridView1.DataBind();
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                DataRowView mydrv;
                string gIntro;
                if (GridView1.PageIndex == 0)
                {
                    mydrv = myds.Tables["飞狐工作室"].DefaultView[i];
                    gIntro = Convert.ToString(mydrv["家庭住址"]);
                    GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
                }
                else
                {
                    mydrv = myds.Tables["飞狐工作室"].DefaultView[i + (5 * GridView1.PageIndex)];
                    gIntro = Convert.ToString(mydrv["家庭住址"]);
                    GridView1.Rows[i].Cells[3].Text = SubStr(gIntro, 2);
                }
            }
            
            sqlcon.Close();
        }
        public string SubStr(string sString, int nLeng)
        {
            if (sString.Length <= nLeng)
            {
                return sString;
            }
            string sNewStr = sString.Substring(0, nLeng);
            sNewStr = sNewStr + "...";
            return sNewStr;
        }
        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            //如果是绑定数据行 
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                ////鼠标经过时,行背景色变 
                //e.Row.Attributes.Add("onmouseover", "this.style.backgroundColor='#E6F5FA'");
                ////鼠标移出时,行背景色变 
                //e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor='#FFFFFF'");

                ////当有编辑列时,避免出错,要加的RowState判断 
                //if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
                //{
                //    ((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm('你确认要删除:"" + e.Row.Cells[1].Text + ""吗?')");
                //}

            }
            if (e.Row.RowIndex != -1)
            {
                int id = e.Row.RowIndex + 1;
                e.Row.Cells[0].Text = id.ToString();
            }

        }
    }

    看视频

    遇到问题:

    明日目标:

    学习Android studio的开发

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  • 原文地址:https://www.cnblogs.com/leiyu1905/p/14909864.html
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