dropdownlist一直拿不到我要的值

luck0791 2010-01-15 12:19:24

在写网页的时候遇到dropdownlist一直拿不到我要的值。
后台代码如下：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Data.SqlClient;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class add_parm : System.Web.UI.Page
{
string sqlStoredProcedure = "";

protected void Page_Load(object sender, EventArgs e)
{

try
{
sqlStoredProcedure = "web_compay";
DBHelper.filldropdownlist_compay(sqlStoredProcedure, DropDownList1);
DropDownList1.Items.Insert(0, new ListItem("--请选择--", "-1"));
sqlStoredProcedure = "web_compay_dept";
DBHelper.filldropdownlist_compay_dept(sqlStoredProcedure, DropDownList2);
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "-1"));
}
catch
{
Response.Write("<script language=JavaScript>alert('Your message');</script>");
}
finally
{
DBHelper.Connection.Close();
}

if (!Page.IsPostBack)
{
TextBox1.Text = "";
TextBox2.Text = "";
Button1.Text = " 保存";
}

}

protected void Button1_Click(object sender, EventArgs e)
{
try
{
string compay = "";
string dept = "";

compay =DropDownList1.SelectedItem.ToString();
dept=DropDownList2.SelectedItem.ToString() ;
sqlStoredProcedure = "web_addbuyeruser";
string[] temps = { TextBox1.Text, TextBox2.Text, TextBox3.Text,compay,dept };
DBHelper.adduser(sqlStoredProcedure, temps);
}
catch
{
Response.Write("<script language=JavaScript>alert('Your message');</script>");
}
finally
{
DBHelper.Connection.Close();
}

}
}

前台代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="adduser.aspx.cs" Inherits="add_parm" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>

用户名：</div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<br />
密码：<br />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<br />
姓名：<br />
<asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
<br />
所属公司：<br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<br />
<br />
部门：<br />
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<br />
<br />
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
</body>
</html>

===============
有加了
if (!Page.IsPostBack)
{
compay =DropDownList1.SelectedItem.ToString();
dept=DropDownList2.SelectedItem.ToString() ;}
情况还是一样。怎么解决？谢谢大家了。

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戒烟戒酒戒编程 2010-01-15

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[Quote=引用楼主 luck0791 的回复:]
在写网页的时候遇到dropdownlist一直拿不到我要的值。
后台代码如下：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Data.SqlClient;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class add_parm : System.Web.UI.Page
{
string sqlStoredProcedure = "";

protected void Page_Load(object sender, EventArgs e)
{

try
{
sqlStoredProcedure = "web_compay";
DBHelper.filldropdownlist_compay(sqlStoredProcedure, DropDownList1);
DropDownList1.Items.Insert(0, new ListItem("--请选择--", "-1"));
sqlStoredProcedure = "web_compay_dept";
DBHelper.filldropdownlist_compay_dept(sqlStoredProcedure, DropDownList2);
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "-1"));
}
catch
{
Response.Write(" <script language=JavaScript>alert('Your message'); </script>");
}
finally
{
DBHelper.Connection.Close();
}

if (!Page.IsPostBack)
{
TextBox1.Text = "";
TextBox2.Text = "";
Button1.Text = " 保存";
}

}

protected void Button1_Click(object sender, EventArgs e)
{
try
{
string compay = "";
string dept = "";

[color=#99CC00] //这里是获取DropDownList当前选项的文本值
compay =DropDownList1.SelectedItem.Text.ToString();
//这里是获取DropDownList当前选项的ID
dept=DropDownList2.SelectedItem.Value.ToString() ;[/color]
sqlStoredProcedure = "web_addbuyeruser";
string[] temps = { TextBox1.Text, TextBox2.Text, TextBox3.Text,compay,dept };
DBHelper.adduser(sqlStoredProcedure, temps);
}
catch
{
Response.Write(" <script language=JavaScript>alert('Your message'); </script>");
}
finally
{
DBHelper.Connection.Close();
}

}
}

前台代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="adduser.aspx.cs" Inherits="add_parm" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页 </title>
</head>
<body>
<form id="form1" runat="server">
<div>

用户名： </div>
<asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox>
<br />
密码： <br />
<asp:TextBox ID="TextBox2" runat="server"> </asp:TextBox>
<br />
姓名： <br />
<asp:TextBox ID="TextBox3" runat="server"> </asp:TextBox>
<br />
所属公司： <br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<br />
<br />
部门： <br />
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<br />
<br />
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
</body>
</html>

===============
有加了
if (!Page.IsPostBack)
{
compay =DropDownList1.SelectedItem.ToString();
dept=DropDownList2.SelectedItem.ToString() ;}
情况还是一样。怎么解决？谢谢大家了。
[/Quote]

戒烟戒酒戒编程 2010-01-15

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尴尬怎么没有权限修改自己发的帖子

戒烟戒酒戒编程 2010-01-15

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[Quote=引用楼主 luck0791 的回复:]
在写网页的时候遇到dropdownlist一直拿不到我要的值。
后台代码如下：
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Data.SqlClient;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

public partial class add_parm : System.Web.UI.Page
{
string sqlStoredProcedure = "";

protected void Page_Load(object sender, EventArgs e)
{

try
{
sqlStoredProcedure = "web_compay";
DBHelper.filldropdownlist_compay(sqlStoredProcedure, DropDownList1);
DropDownList1.Items.Insert(0, new ListItem("--请选择--", "-1"));
sqlStoredProcedure = "web_compay_dept";
DBHelper.filldropdownlist_compay_dept(sqlStoredProcedure, DropDownList2);
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "-1"));
}
catch
{
Response.Write(" <script language=JavaScript>alert('Your message'); </script>");
}
finally
{
DBHelper.Connection.Close();
}

if (!Page.IsPostBack)
{
TextBox1.Text = "";
TextBox2.Text = "";
Button1.Text = " 保存";
}

}

protected void Button1_Click(object sender, EventArgs e)
{
try
{
string compay = "";
string dept = "";

[color=#339966] //这里是获取DropDownList当前选项的文本值
compay =DropDownList1.SelectedItem.Text.ToString();
//这里是获取DropDownList当前选项的ID
dept=DropDownList2.SelectedItem.Value.ToString() ;[/color]
sqlStoredProcedure = "web_addbuyeruser";
string[] temps = { TextBox1.Text, TextBox2.Text, TextBox3.Text,compay,dept };
DBHelper.adduser(sqlStoredProcedure, temps);
}
catch
{
Response.Write(" <script language=JavaScript>alert('Your message'); </script>");
}
finally
{
DBHelper.Connection.Close();
}

}
}

前台代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="adduser.aspx.cs" Inherits="add_parm" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页 </title>
</head>
<body>
<form id="form1" runat="server">
<div>

用户名： </div>
<asp:TextBox ID="TextBox1" runat="server"> </asp:TextBox>
<br />
密码： <br />
<asp:TextBox ID="TextBox2" runat="server"> </asp:TextBox>
<br />
姓名： <br />
<asp:TextBox ID="TextBox3" runat="server"> </asp:TextBox>
<br />
所属公司： <br />
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<br />
<br />
部门： <br />
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<br />
<br />
<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
</body>
</html>

===============
有加了
if (!Page.IsPostBack)
{
compay =DropDownList1.SelectedItem.ToString();
dept=DropDownList2.SelectedItem.ToString() ;}
情况还是一样。怎么解决？谢谢大家了。
[/Quote]

注意看颜色提示部分

vip__888 2010-01-15

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[Quote=引用 8 楼 wuyq11 的回复:]
if (!IsPostBack)
{//绑定数据}
DropDownList1.SeletedValue
[/Quote]
...

wuyq11 2010-01-15

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if (!IsPostBack)
{//绑定数据}
DropDownList1.SeletedValue

flyerwing 2010-01-15

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如上

itliyi 2010-01-15

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页面回发了怎么还有值
if(!IsPostBack)
{
...
}
ls的

mngzilin 2010-01-15

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protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{

try
{
sqlStoredProcedure = "web_compay";
DBHelper.filldropdownlist_compay(sqlStoredProcedure, DropDownList1);
DropDownList1.Items.Insert(0, new ListItem("--请选择--", "-1"));
sqlStoredProcedure = "web_compay_dept";
DBHelper.filldropdownlist_compay_dept(sqlStoredProcedure, DropDownList2);
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "-1"));
}
catch
{
Response.Write(" <script language=JavaScript>alert('Your message'); </script>");
}
finally
{
DBHelper.Connection.Close();
}
TextBox1.Text = "";
TextBox2.Text = "";
Button1.Text = " 保存";
}

}

abeniaj0427 2010-01-15

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DropDownList1.SelectedItem.Value

TalesTen 2010-01-15

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compay =DropDownList1.SelectedItem.ToString();
你是要去Text还是Value??

TalesTen 2010-01-15

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sqlStoredProcedure = "web_compay";
DBHelper.filldropdownlist_compay(sqlStoredProcedure, DropDownList1);
DropDownList1.Items.Insert(0, new ListItem("--请选择--", "-1"));
sqlStoredProcedure = "web_compay_dept";
DBHelper.filldropdownlist_compay_dept(sqlStoredProcedure, DropDownList2);
DropDownList2.Items.Insert(0, new ListItem("--请选择--", "-1"));
这里已经赋值成功了吗?

abeniaj0427 2010-01-15

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DropDownList1.SelectedItem.Text

由于初始化判断出错导致每次传到服务器的时候会初始化一次，这就导致每次获取DropDownList的SelectIndex的时候只能是0