X8023ZDataGrid绑定DropdownList源码

该示例实现功能:
                1:根据DropDownList动态更新DataGrid
                2:利用DropDownList和TextBox作为模板列
                3:编辑动态更新数据库




部分源码:

  1using System;
  2using System.Collections;
  3using System.ComponentModel;
  4using System.Configuration;
  5using System.Data;
  6using System.Drawing;
  7using System.Web;
  8using System.Web.SessionState;
  9using System.Web.UI;
 10using System.Web.UI.WebControls;
 11using System.Web.UI.HtmlControls;
 12using System.Data.SqlClient;
 13
 14namespace X8023Z
 15{
 16    /**//// <summary>
 17    /// dgdr8023 的摘要说明。
 18    /// </summary>
 19    partial class dgdr8023 : System.Web.UI.Page
 20    {
 21
 22
 23        private void Page_Load(object sender, System.EventArgs e)
 24        {
 25            // 在此处放置用户代码以初始化页面
 26            if (!IsPostBack)
 27            {
 28                SetBind();
 29                SetBind2();
 30            }
 31        }
 32
 33        protected void SetBind()
 34        {
 35
 36            SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["conn"]);
 37            SqlDataAdapter da = new SqlDataAdapter("select * from stu,dep where stu.studepid=dep.depid", conn);
 38            DataSet ds = new DataSet();
 39            da.Fill(ds, "table1");
 40            this.DataGrid1.DataSource = ds.Tables["table1"];
 41            this.DataGrid1.DataBind();
 42
 43        }
 44
 45        protected void SetBind2()
 46        {
 47
 48            SqlConnection conn2 = new SqlConnection(ConfigurationManager.AppSettings["conn"]);
 49            SqlDataAdapter da2 = new SqlDataAdapter("select * from dep", conn2);
 50            DataSet ds2 = new DataSet();
 51            da2.Fill(ds2, "table1");
 52            this.DropDownList1.DataSource = ds2.Tables["table1"];
 53            this.DropDownList1.DataTextField = "depname";
 54            this.DropDownList1.DataValueField = "depid";
 55            this.DropDownList1.DataBind();
 56            this.DropDownList1.Items.Insert(0, new ListItem("请选择", ""));
 57
 58        }
 59
 60        protected void SetBind3()
 61        {
 62            string s = this.DropDownList1.SelectedValue;
 63            SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["conn"]);
 64            SqlCommand comm = new SqlCommand();
 65            comm.Connection = conn;
 66            if (s != "")
 67            {
 68                comm.CommandText = "select * from stu,dep where stu.studepid=dep.depid and depid=@depid";
 69                SqlParameter parm1 = new SqlParameter("@depid", SqlDbType.Int);
 70                parm1.Value = s;
 71                comm.Parameters.Add(parm1);
 72            }
 73            else
 74                comm.CommandText = "select * from stu,dep where stu.studepid=dep.depid";
 75            SqlDataAdapter da = new SqlDataAdapter();
 76            da.SelectCommand = comm;
 77            DataSet ds = new DataSet();
 78            da.Fill(ds, "table1");
 79            this.DataGrid1.DataSource = ds.Tables["table1"];
 80            this.DataGrid1.DataBind();
 81
 82        }
 83        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码
 84        override protected void OnInit(EventArgs e)
 85        {
 86            //
 87            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
 88            //
 89            InitializeComponent();
 90            base.OnInit(e);
 91        }
 92
 93        /**//// <summary>
 94        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
 95        /// 此方法的内容。
 96        /// </summary>
 97        private void InitializeComponent()
 98        {
 99            this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
100            this.DropDownList1.SelectedIndexChanged += new System.EventHandler(this.DropDownList1_SelectedIndexChanged);
101            this.Load += new System.EventHandler(this.Page_Load);
102
103        }
104        #endregion
105
106        private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
107        {
108
109            SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["conn"]);
110            SqlDataAdapter da = new SqlDataAdapter("select * from dep", conn);
111            DataSet ds = new DataSet();
112            da.Fill(ds, "table1");
113            if (e.Item.ItemType == ListItemType.EditItem)
114            {
115                DropDownList ddl = (DropDownList)e.Item.FindControl("dep");
116                ddl.DataSource = ds.Tables["table1"];
117                ddl.DataTextField = "depname";
118                ddl.DataValueField = "depid";
119                ddl.DataBind();
120                ddl.Items.FindByValue(Convert.ToString(DataBinder.Eval(e.Item.DataItem, "depid"))).Selected = true;//选择数据库内的作为默认
121            }
122        }
123
124        protected void edit(object sender, DataGridCommandEventArgs e)
125        {
126            this.DataGrid1.EditItemIndex = e.Item.ItemIndex;
127            if (this.DropDownList1.SelectedValue == "")
128                SetBind();
129            else
130                SetBind3();
131        }
132
133        protected void cancel(object sender, DataGridCommandEventArgs e)
134        {
135            this.DataGrid1.EditItemIndex = -1;
136            if (this.DropDownList1.SelectedValue == "")
137                SetBind();
138            else
139                SetBind3();
140        }
141
142        protected void update(object sender, DataGridCommandEventArgs e)
143        {
144            if (e.Item.ItemType == ListItemType.EditItem)//只有在编辑按下以后才能提交
145            {
146                SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["conn"]);
147                SqlCommand comm = new SqlCommand("update stu set stuname=@name,studepid=@depid where stuid=@id", conn);
148                SqlParameter parm1 = new SqlParameter("@name", SqlDbType.NVarChar, 50);
149                parm1.Value = ((TextBox)e.Item.FindControl("name")).Text;
150                SqlParameter parm2 = new SqlParameter("@depid", SqlDbType.Int);
151                parm2.Value = ((DropDownList)e.Item.FindControl("dep")).SelectedValue;
152                SqlParameter parm3 = new SqlParameter("@id", SqlDbType.Int);
153                parm3.Value = this.DataGrid1.DataKeys[e.Item.ItemIndex];
154                comm.Parameters.Add(parm1);
155                comm.Parameters.Add(parm2);
156                comm.Parameters.Add(parm3);
157                conn.Open();
158                comm.ExecuteNonQuery();
159                conn.Close();
160                this.DataGrid1.EditItemIndex = -1;
161                if (this.DropDownList1.SelectedValue == "")
162                    SetBind();
163                else
164                    SetBind3();//如果选择过滤则使用SetBind3()
165            }
166        }
167
168        private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
169        {
170            SetBind3();
171        }
172    }
173}
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