checkboxlist绑定数据方法，以及使用方法

checkboxlist绑定数据方法

1.把数据绑定到CheckBoxList中

特别要注意加载顺序

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                SqlConnection con = GetDBCon.GetCon();
                con.Open();
                SqlDataAdapter sda = new SqlDataAdapter("select * from admin", con);
                DataSet ds = new DataSet();
                sda.Fill(ds,"admin");
                this.CheckBoxList1.DataSource = ds.Tables[0];
                this.CheckBoxList1.DataTextField = "username";//绑定的字段名
                this.CheckBoxList1.DataValueField = "userid";//绑定的值
                this.CheckBoxList1.DataBind();
               
             
                
            }
        }

2.循环读取出来

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.Lab2.Text = "";
            for (int i = 0; i < CheckBoxList1.Items.Count; i++)
            {
                if (this.CheckBoxList1.Items[i].Selected)
                {
                    this.Lab2.Text = this.Lab2.Text+CheckBoxList1.Items[i].Text+".";
                }
            }
        }

 

 

3.CheckBoxList取值
string strrighgs = "";
for (int i = 0; i < CheckBoxList1.Items.Count; i++)
{
if (CheckBoxList1.Items[i].Selected == true)
{
strrighgs += CheckBoxList1.Items[i].Value+"|";
}
}

string str = "";
foreach (ListItem li in CheckBoxList1.Items)
{
if (li.Selected == true)
{
str += li.Value+";";
}
}

Response.Write(str);
Response.End();
CheckBoxList取值及勾选
string[] strtemp = strapp.Split('|');
foreach (string str in strtemp)
{
for (int i = 0; i < CheckBoxList1.Items.Count; i++)
{
if (CheckBoxList1.Items[i].Value == str)
{
CheckBoxList1.Items[i].Selected = true;
}
}
}

 

  <asp:CheckBoxList ID="cblproject" name="cblproject" runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow">
  </asp:CheckBoxList>

 

         //绑定项目数据
                BLL.project bll_prjct = new BLL.project();
                DataSet ds_prjct = bll_prjct.GetList(50, " “,"id desc");
                cblproject.DataSource = ds_prjct.Tables[0];
                cblproject.DataValueField = "id";
                cblproject.DataTextField = "project_name";
                cblproject.DataBind();

        //添加方法中，修改方法中也一样
          　string project_id = "";
            for (int i = 0; i < cblproject.Items.Count; i++)
            {
                if (cblproject.Items[i].Selected == true) project_id +=cblproject.Items[i].Value + "|";
            }
            model.project_id = project_id;      

          //修改时加载数据，DelLastChar为去掉最后一个字符的方法，model.project_id的结构为6|7|4|
           string[] project_list = DelLastChar(model.project_id, "|").Split('|');
                 foreach(string str in project_list)
            {
                for (int i = 0; i < cblproject.Items.Count; i++)
                {
                    if (cblproject.Items[i].Value == str)
                    {
                        cblproject.Items[i].Selected = true;
                    }
                }

            }