第一部份：20180718
基础应用 取值
1、前台代码：
<asp:DropDownList ID="DDLcustomID" runat="server" DataTextField="customName" DataValueField="customID" EnableViewState="True" AppendDataBoundItems="False" AutoPostBack="False"></asp:DropDownList>
请注意各项参数的设置
EnableViewState="True" AppendDataBoundItems="False" AutoPostBack="False">
2、后台代码：
public partial class SysCustomCNameNew : System.Web.UI.Page
{
int reValue;//用于保存返回值。返回值为-1（用户名存在），0（失败），1（成功），2（用户名不存在）
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//DDLcustomID.Items.Clear();
//DDLcustomID.DataTextField = "";
//DDLcustomID.DataValueField = "";
////DDLcustomID.DataSource = dt;
////DDLcustomID.DataBind();
DropDownListBind();
}
}
public void DropDownListBind()
{
//DDLcustomID.Items.Clear();
//实例化公共类的对象
DB db = new DB();
//定义SQL语句
string sqlstr = "SELECT [customID], [customName] FROM [BaCustom] ";
//实例化数据集DataTable用于存储查询结果
DataTable dt = db.reDt(sqlstr);
//绑定DropDownListt控件
DDLcustomID.DataSource = dt;//设置数据源，用于填充控件中的项的值列表
DDLcustomID.DataBind();//将控件及其所有子控件绑定到指定的数据源
//DDLcustomID.SelectedValue ="请选择";
}
protected void btninsert_Click(object sender, EventArgs e)
{
reValue = CheckCNameNew();
if (reValue == -1)
{
Response.Write("<script>alert('此客户简称下的联系人已经存在,请检查后重新录入！');</script>");
}
else
{
DB db = new DB();
int customID = int.Parse(DDLcustomID.SelectedValue.ToString());
//string customID = DDLcustomID.SelectedValue.ToString();
//string customID = DDLcustomID.SelectedItem.Value;
//string customID = DDLcustomID.SelectedValue;
//string customID = DDLcustomID.SelectedItem.Value;
//int customID = Convert.ToInt32(DDLcustomID.SelectedValue.ToString());
//string customID = this.TextcustomID.Value;
string cuConName = this.textcuConName.Value;
string cuConDust = this.textcuConDust.Value;
string cuConMob = this.textcuConMob.Value;
string cuConTel = this.textcuConTel.Value;
string cuConMail = this.textcuConMail.Value;
string cuConQQ = this.textcuConQQ.Value;
string cuConRemark = this.textcuConRemark.Value;
string cmdStr = "insert into BaCuContact(customID,cuConName,cuConDust,cuConMob,cuConTel,cuConQQ,cuConMail,cuConRemark) values('" + customID + "','" + cuConName + "','" + cuConDust + "'," + cuConMob + ",'" + cuConTel + "','" + cuConQQ + "','" + cuConMail + "','" + cuConRemark + "')";
reValue = db.sqlEx(cmdStr);
if (reValue == 1)
{
Response.Write("<script>alert('添加新联系人成功！');</script>");
ClearText();//添加成功后清空输入框
}
else if (reValue == 0)
{
Response.Write("<script>alert('添加新联系人失败！！');</script>");
//Response.Redirect("~/sysCustomCNameNew.aspx");
}
}
}
public void ClearText()
{
Response.Redirect("~/sysCustomCNameNew.aspx");
//this.textcuConName.Value = "";
//this.textcuConDust.Value = "";
//this.textcuConMob.Value = "";
//this.textcuConTel.Value = "";
//this.textcuConMail.Value = "";
//this.textcuConQQ.Value = "";
//this.textcuConRemark.Value = "";
}
public int CheckCNameNew()
{
//实例化公共类对象
DB db = new DB();
string str = "select count(*) from BaCuContact where cuConName='" + this.textcuConName.Value + "' and customID='" + DDLcustomID.SelectedValue.ToString() + "'";
DataTable dt = db.reDt(str);
if (dt.Rows[0][0].ToString() != "0")
{
return -1;//该联系人已经存在
}
else
{
return 2;//该联系人尚未注册
}
}
protected void btnBack_Click(object sender, EventArgs e)
{
//Response.Redirect("~/sysCustomNew.aspx");
}
protected void btnReturn_Click(object sender, EventArgs e)
{
Response.Redirect("~/sysCustomCName.aspx");
}
}