表结构
create table login
(
usID varchar(15)primary key,
username varchar(20)not null,
useraddress varchar(50) not null,
userphone varchar(50) not null
)web.config文件如下:<configuration>
<appSettings>
<add key="SQLCONNECTIONTRING" value="data source=172.16.0.3;uid=sa;pwd=sa;database=Users"></add></appSettings>代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;
using System.Data.SqlClient;
namespace login
{
/// <summary>
/// show 的摘要说明。
/// </summary>
public class show : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;
private void Page_Load(object sender, System.EventArgs e)
{
// String strConnection=ConfigurationSettings.AppSettings["Users"].
// SqlConnection objConnection=new
String strConnection=ConfigurationSettings.AppSettings["Users"];
SqlConnection objConnection=new SqlConnection(strConnection);
String strSQL="select * from login";
SqlDataAdapter objAdapter=new SqlDataAdapter(strSQL,objConnection);
DataSet objDataSet=new DataSet();
objAdapter.Fill(objDataSet,"Users");
DataGrid1.DataSource=objDataSet.Tables["Users"];
DataGrid1.DataBind();
// 在此处放置用户代码以初始化页面
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
{
}
}
}出错如下:ConnectionString 属性尚未初始化。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.InvalidOperationException: ConnectionString 属性尚未初始化。源错误:
行 31: SqlDataAdapter objAdapter=new SqlDataAdapter(strSQL,objConnection);
行 32: DataSet objDataSet=new DataSet();
行 33: objAdapter.Fill(objDataSet,"Users");
行 34: DataGrid1.DataSource=objDataSet.Tables["Users"];
行 35: DataGrid1.DataBind();
源文件: c:\inetpub\wwwroot\login\show.aspx.cs 行: 33 堆栈跟踪:
[InvalidOperationException: ConnectionString 属性尚未初始化。]
System.Data.SqlClient.SqlConnection.Open()
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
login.show.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\login\show.aspx.cs:33
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()
create table login
(
usID varchar(15)primary key,
username varchar(20)not null,
useraddress varchar(50) not null,
userphone varchar(50) not null
)web.config文件如下:<configuration>
<appSettings>
<add key="SQLCONNECTIONTRING" value="data source=172.16.0.3;uid=sa;pwd=sa;database=Users"></add></appSettings>代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;
using System.Data.SqlClient;
namespace login
{
/// <summary>
/// show 的摘要说明。
/// </summary>
public class show : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;
private void Page_Load(object sender, System.EventArgs e)
{
// String strConnection=ConfigurationSettings.AppSettings["Users"].
// SqlConnection objConnection=new
String strConnection=ConfigurationSettings.AppSettings["Users"];
SqlConnection objConnection=new SqlConnection(strConnection);
String strSQL="select * from login";
SqlDataAdapter objAdapter=new SqlDataAdapter(strSQL,objConnection);
DataSet objDataSet=new DataSet();
objAdapter.Fill(objDataSet,"Users");
DataGrid1.DataSource=objDataSet.Tables["Users"];
DataGrid1.DataBind();
// 在此处放置用户代码以初始化页面
} #region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load); }
#endregion private void DataGrid1_SelectedIndexChanged(object sender, System.EventArgs e)
{
}
}
}出错如下:ConnectionString 属性尚未初始化。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.InvalidOperationException: ConnectionString 属性尚未初始化。源错误:
行 31: SqlDataAdapter objAdapter=new SqlDataAdapter(strSQL,objConnection);
行 32: DataSet objDataSet=new DataSet();
行 33: objAdapter.Fill(objDataSet,"Users");
行 34: DataGrid1.DataSource=objDataSet.Tables["Users"];
行 35: DataGrid1.DataBind();
源文件: c:\inetpub\wwwroot\login\show.aspx.cs 行: 33 堆栈跟踪:
[InvalidOperationException: ConnectionString 属性尚未初始化。]
System.Data.SqlClient.SqlConnection.Open()
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState)
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable)
login.show.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\login\show.aspx.cs:33
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()
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