异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。这个该怎么解决? [问题点数:20分,无满意结帖,结帖人qq_39414785]

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异常详细信息:System.NullReferenceException: 未将对象引用设置对象实例
rn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn页面出错提示为:rn <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rn说明: 执行当前 Web 请求期间,出现未处理的<em>异常</em>。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<em>详细信息</em>。rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误:rnrn行 10: public class SqlConnrn行 11: rn行 12: public static string Conn = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString(); rn行 13: rn行 14: rnrnrn源文件: D:\Coffee\Project\Common\Common\SqlConn.cs 行: 12rnrn堆栈跟踪:rnrn[NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。]rn En.Common.SqlConn..cctor() in D:\Coffee\Project\Common\Common\SqlConn.cs:12rnrn[TypeInitializationException: “En.Common.SqlConn”的类型初始值设定项引发<em>异常</em>。]rn En.BusinessRole.Manager.GetClientCompanyByID(Int32 id) in D:\Coffee\Project\BusinessRole\BusinessRole\Manager.cs:28rn Manager_Login.ShowCompanyName() in d:\Coffee\Project\Eclipse\Manager\Login.aspx.cs:31rn Manager_Login.Page_Load(Object sender, EventArgs e) in d:\Coffee\Project\Eclipse\Manager\Login.aspx.cs:23rn System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15rn System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34rn System.Web.UI.Control.OnLoad(EventArgs e) +99rn System.Web.UI.Control.LoadRecursive() +47rn System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061rnrnrn版本信息: Microsoft .NET Framework 版本:2.0.50727.42; ASP.NET 版本:2.0.50727.42rnrnrnApp.configrn[code=C#]rnrnrn rn rn rnrnrn[/code]rnrnrn出错的是<em>这个</em>文件:rn[color=#FF0000]源文件: D:\Coffee\Project\Common\Common\SqlConn.cs 行: 12rn[/color]rn[code=C#]rnusing System;rnusing System.Collections.Generic;rnusing System.Text;rnusing System.Configuration;rnusing System.Data;rnusing System.Data.SqlClient;rnrnnamespace En.Commonrnrn public class SqlConnrn rn public static string Conn = System.Configuration.ConfigurationManager.AppSettings["ConnectionString"].ToString(); rn rnrnrn[/code]rnrnrnrnrnrn什么问题呢?rn
求助!--异常详细信息: System.NullReferenceException: 未将对象引用设置对象实例
rn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rn源错误: rnrnrn行 36: SqlDataAdapter cmd2=new SqlDataAdapter("select * from forum_2",con);rn行 37: cmd2.Fill(ds1,"forum_2"); rn行 38: child.DataSource=ds1.Tables["forum_2"];rn行 39: parent.DataSource=ds.Tables["forum_1"];rn行 40: parent.DataBind();rnrn我的数据绑定是这样的:rn rn rn rn rnrn rn rn rnrn rn rn rn rn rn rnrnrnrnrnrnrnrnrnrnrnrnrn//------------------rnprivate void Page_Load(object sender, System.EventArgs e)rnrn SqlConnection con=new SqlConnection (System.Configuration.ConfigurationSettings.AppSettings["con"]);rn con.Open();rn DataSet ds=new DataSet();rn SqlDataAdapter cmd1=new SqlDataAdapter("select * from forum_1",con);rn cmd1.Fill(ds,"forum_1"); rn rn SqlDataAdapter cmd2=new SqlDataAdapter("select * from forum_2",con);rn cmd2.Fill(ds1,"forum_2"); rn child.DataSource=ds1.Tables["forum_2"];rn parent.DataSource=ds.Tables["forum_1"];rn parent.DataBind();rn child.DataBind(); rn rn // 在此处放置用户代码以初始化页面rnrnrn为什么老是child部分出错,我试过如果不让parent处child嵌套的话,就不会提示错误!rn这是<em>怎么</em>回事是呀,请大哥们帮帮忙rnrn rn
异常详细信息: System.NullReferenceException: 未将对象引用设置对象实例。帮帮我啊
源错误: rnrnrn行 835: Dim cbox As CheckBox = Me.DataList1.Items(f).FindControl("CheckBox11")rn行 836: If (Me.CheckBox10.Checked = True) Thenrn行 837: cbox.Checked = Truern行 838: Elsern行 839: cbox.Checked = Falsern rn堆栈跟踪: rnrnrn[NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。]rn 网上购票系统.WebForm7.CheckBox10_CheckedChanged(Object sender, EventArgs e) in c:\inetpub\wwwroot\网上购票系统\用户信息管理.aspx.vb:837rn System.Web.UI.WebControls.CheckBox.OnCheckedChanged(EventArgs e)rn System.Web.UI.WebControls.CheckBox.System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent()rn System.Web.UI.Page.RaiseChangedEvents()rn System.Web.UI.Page.ProcessRequestMain() +1081rnrn rnrn
###异常详细信息: System.NullReferenceException: 未将对象引用设置对象实例
Imports System.Data.OleDbrnPublic Class MainFormrn Inherits System.Web.UI.Pagern Dim conn As OleDbConnectionrn Dim ds As New DataSetrn Dim da As OleDbDataAdapterrn Public dataView1 As DataViewrnrn Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Loadrn '在此处放置初始化页的用户代码rn If Not IsPostBack Thenrn conn = New OleDbConnection(Application("conn"))rn da = New OleDbDataAdapterrnrn Dim delstring As String = "DELETE FROM Questions WHERE (Q_ID = @Original_Q_ID) "rn delstring = delstring & "AND (BigClass_ID = @Original_BigClass_ID OR @Original_BigClass_ID IS NULL AND BigClass_ID IS NULL) "rn delstring = delstring & "AND (HiteCounter = @Original_HiteCounter OR @Original_HiteCounter IS NULL AND HiteCounter IS NULL) AND "rn delstring = delstring & "(ImageName = @Original_ImageName OR @Original_ImageName IS NULL AND ImageName IS NULL) AND "rn delstring = delstring & " (Q_Note = @Original_Q_Note OR @Original_Q_Note IS NULL AND Q_Note IS NULL) AND (ReferTime = @Original_ReferTime OR "rn delstring = delstring & "@Original_ReferTime IS NULL AND ReferTime IS NULL) AND (ReleaseTime = @Original_ReleaseTime OR "rn delstring = delstring & "@Original_ReleaseTime IS NULL AND ReleaseTime IS NULL) AND (SmallClass_ID = @Original_SmallClass_ID OR "rn delstring = delstring & "@Original_SmallClass_ID IS NULL AND SmallClass_ID IS NULL) AND (author = @Original_author OR @Original_author IS"rn delstring = delstring & " NULL AND author IS NULL)"rn '删除命令rn da.DeleteCommand.CommandText = delstringrn上面一句有错:<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。
异常详细信息: 未将对象引用设置对象实例
请问这是什么原因啊rn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。行: 176 rn行 174: Int32 FileLength=0;rn行 175:rn行 176: FileLength=UpFile.PostedFile.ContentLength;rnrn rn
System.NullReferenceException: 未将对象引用设置对象实例这个异常是什么意思?
System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。<em>这个</em><em>异常</em>是什么意思?能否举一个具体<em>实例</em>说明之?
System.NullReferenceException: 未将对象引用设置对象实例
<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。 rn说明: 执行当前 Web 请求期间,出现未处理的<em>异常</em>。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<em>详细信息</em>。 rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 82: rn行 83: DataSet ds = SQLHelper.Getdataset(com);rn行 84: if (ds.Tables["0"].Rows.Count > 0)rn行 85: rn行 86: a.AdminId = Convert.ToInt32(ds.Tables[0].Rows[0]["Id"].ToString());rnrnrnrn代码:rnrn string SQL_CheckLogin = @"select * from [Admin] where [AdminName]=@name and [AdminPwd]=@pwd";rn Entity.Admin a = new Admin();rnrn OleDbCommand com = SQLHelper.GetCommandStr( SQL_CheckLogin);rn rn OleDbParameter[] parms =rn new OleDbParameter("@name",ad.AdminName),rn new OleDbParameter("@pwd",ad.AdminPwd)rn ;rn foreach (OleDbParameter parm in parms)rn rn com.Parameters.Add(parm);rn rnrn DataSet ds = SQLHelper.Getdataset(com);rn if (ds.Tables["0"].Rows.Count > 0)rn rn a.AdminId = Convert.ToInt32(ds.Tables[0].Rows[0]["Id"].ToString());rn a.AdminName = ds.Tables[0].Rows[0]["AdminName"].ToString();rn a.AdminPwd = ds.Tables[0].Rows[0]["AdminPwd"].ToString();rn rn rn
System.NullReferenceException: 未将对象引用设置对象实例 的疑问??
各位大虾,小弟菜鸟,编译的时候出了<em>这个</em>问题可能是什么地方有问题了??恳请各位大虾指点一番~~不胜感激~~rnrnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 148: break;rn行 149: rn[color=#FF0000]行 150: SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);[/color]行 151: SqlCommand cmd = new SqlCommand(selectStr, conn);rn行 152: tryrn rnrn源文件: e:\新建文件夹\Visual Studio 2005\Projects\0600220229-01\15977448344\denglu.aspx.cs 行: 150
iis6.0 System.NullReferenceException: 未将对象引用设置对象实例
<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。 rn说明: 执行当前 Web 请求期间,出现未经处理的<em>异常</em>。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<em>详细信息</em>。 rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 122: rn行 123: //使用版块rn行 124: if ((config.Iisurlrewrite == 1 || config.Aspxrewrite == 1) && requestPath.EndsWith("/list.aspx") &&rn行 125: requestPath.IndexOf("/archiver/") < 0 && requestPath.IndexOf("/install/") < 0 && requestPath.IndexOf("/upgrade/") < 0 &&rn行 126: requestPath.IndexOf("/admin/") < 0 && requestPath.IndexOf("/aspx/") < 0 && requestPath.IndexOf("/tools/") < 0 &&rn rnrn源文件: D:\BBSProjects\XL.Forum\HttpModule.cs 行: 124 rnrn堆栈跟踪: rnrnrn[NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。]rn XL.Forum.HttpModule.ReUrl_BeginRequest(Object sender, EventArgs e) in D:\BBSProjects\XL.Forum\HttpModule.cs:124rn System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +213rn System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +76rnrn rnrnrn--------------------------------------------------------------------------------rn版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.0.30319.1 rnrn疑惑:rn我在vs2008 调试的时候就没有<em>这个</em><em>异常</em>,为什么部署到iis中就出现了<em>这个</em><em>异常</em>呢?rn希望老师给我个解答。
求救:System.NullReferenceException: 未将对象引用设置对象实例
请各位高人指点迷津,不胜感谢!rn//测试给出的密码是否正确rnpublic bool TestPassword(string pass)rn rn byte[] encryptPass=user.Encrypt(pass); rn for (int i = 0; i
System.NullReferenceException:未将对象引用设置对象实例
//自定义ResultInfo()方法,实现提取指定信息,并将其显示在相应的文本框控件中,可是显示<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>,排错了好长时间,无果,就高手指点rn private void ResultInfo(int j)rn rn tryrn rn DataSet dsNew = DtReslut(j);rn this.txbClassName.Text = dsNew.Tables[0].Rows[0][0].ToString();//出错的地方rn this.txbClassNumber.Text = dsNew.Tables[0].Rows[0][1].ToString();rn this.txbGrade.Text = dsNew.Tables[0].Rows[0][2].ToString();rn this.txbShortName.Text = dsNew.Tables[0].Rows[0][3].ToString();rn this.txbTeacher.Text = dsNew.Tables[0].Rows[0][4].ToString();rn this.txbNo.Text = dsNew.Tables[0].Rows[0][5].ToString();rn rn catch (Exception ex)rn rn MessageBox.Show(ex.Message);rn rnrn
急 System.NullReferenceException: 未将对象引用设置对象实例
错误详细:rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 13: rn行 14: MessageInterface iMsg = MessageFactory.Create();rn[color=#FF0000]rn行 15: return iMsg.AddMessage(message);rn[/color]rn行 16: rn行 17: rn rnrn源文件: F:\GameDesign\Bussiness\MessageBusiness.cs 行: 15 rnrnrn运行页面后台代码:rn[code=C#]rnusing System;rnusing System.Collections;rnusing System.Configuration;rnusing System.Data;rnusing System.Web;rnusing System.Web.Security;rnusing System.Web.UI;rnusing System.Web.UI.HtmlControls;rnusing System.Web.UI.WebControls;rnusing System.Web.UI.WebControls.WebParts;rnusing System.IO;rnusing GD.Model;rnusing GD.DataAccess;rnusing GD.SystemFrameworks;rnusing GD.Bussiness.Message;rnrnpublic partial class AddMsg : System.Web.UI.Pagernrn protected void Page_Load(object sender, EventArgs e)rn rn if (Session["fld_UserName"] == null)rn rn this.Response.Write(" ");rn Response.Redirect("Login.aspx?message=" + Server.UrlEncode("请登录后再留言!"));rn rn //if (!CommonClass.hasSession(Page.Session))rn // Response.Redirect("Login.aspx?message=" + Server.UrlEncode("请登录后再留言!"));rn rnrn protected void btnOK_Click(object sender, EventArgs e)rn rnrn Message message = new Message();rn message.fld_UserId = Convert.ToInt32(Label1.Text);rn message.fld_Title = txtTitle.Text;rn message.fld_Content = txtDSC.Text;rn message.fld_CreatedTime = Convert.ToDateTime(DateTime.Now);rnrn MessageBusiness messageBusiness = new MessageBusiness();rn if (messageBusiness.AddMessage(message))rn rn Utility.AlertMsg(this.Page, "成功");rn rn elsern rn Utility.AlertMsg(this.Page, "失败");rn rn rnrn[/code]rnrn业务层代码:rn[code=C#]rnnamespace GD.Bussiness.Messagernrn using System;rn using System.Data;rn using System.Collections.Generic;rn using System.Text;rn using GD.Model;rn using GD.DataAccess.Message;rnrn public class MessageBusinessrn rn public bool AddMessage(Message message)rn rn MessageInterface iMsg = MessageFactory.Create();rn return iMsg.AddMessage(message);rn rn rnrn[/code]rnrn数据处理代码:rn[code=C#]rnnamespace GD.DataAccess.Messagernrn using System;rn using System.Data;rn using System.Data.SqlClient;rnrn using GD.Model;rn using GD.SystemFrameworks;rn using GD.DataAccess.SystemFrame;rnrn public class MessageSqlHandle : MessageInterfacern rn public bool AddMessage(Message message)rn rn SQLHelper helper = new SQLHelper();rn SqlParameter[] prams = rn new SqlParameter("@fld_UserId",SqlDbType.Int,8),rn new SqlParameter("@fld_Title",SqlDbType.NVarChar,50),rn new SqlParameter("@fld_Content",SqlDbType.NVarChar),rn new SqlParameter("@fld_CreatedTime",SqlDbType.DateTime,8)rn ;rn prams[0].Value = message.fld_UserId;rn prams[1].Value = message.fld_Title;rn prams[2].Value = message.fld_Content;rn prams[3].Value = message.fld_CreatedTime;rnrn int i;rn i = helper.ExecuteNonQuery("Tb_AddMessage", prams);rn if (i == 0)rn return true;rn elsern return false;rn rn rnrn[/code]rn存储过程:rn[code=SQL]rnALTER PROCEDURE dbo.Tb_AddMessagern (rn @fld_UserId int,rn @fld_Title nvarchar(100),rn @fld_Content nvarchar(max),rn @fld_CreatedTime datetime,rn @fld_Clicks intrn )rnASrnBEGINrn BEGIN TRYrn INSERT INTO Tb_Message(rn fld_UserId,rn fld_Title,rn fld_Content,rn fld_CreatedTime,rn fld_Clicksrn )VALUES(rn @fld_UserId,rn @fld_Title,rn @fld_Content,rn @fld_CreatedTime,rn @fld_Clicksrn )rn rn RETURN 0rn END TRYrn BEGIN CATCHrn RETURN ERROR_NUMBER()rn END CATCHrnrnENDrn[/code]rnrn工厂反射模式 的程序 折腾了一下午了 始终<em>解决</em>不了 急啊~~~rn
System.NullReferenceException: 未将对象引用设置对象实例!
<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。 rn说明: 执行当前 Web 请求期间,出现未处理的<em>异常</em>。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<em>详细信息</em>。 rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrn执行当前 Web 请求期间生成了未处理的<em>异常</em>。可以使用下面的<em>异常</em>堆栈跟踪信息确定有关<em>异常</em>原因和发生位置的信息。 rnrn堆栈跟踪: rnrnrn[NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。]rn HotelOnline.hotelcustomer.index4.InitializeComponent() +84rn HotelOnline.hotelcustomer.index4.OnInit(EventArgs e) +13rn System.Web.UI.Control.InitRecursive(Control namingContainer) +241rn System.Web.UI.Page.ProcessRequestMain() +195rnrn 在本机上运行没问题..但是传到服务器就报错!~~~~这是什么原因啊???
System.NullReferenceException: 未将对象引用设置对象实例。!!!
Component1 co=new Component1();rn private void Page_Load(object sender, System.EventArgs e)rn rn rnrn if(!IsPostBack)rn rn bindNew();rn Panel1.Visible=false;rn rn rn void bindNew()rn rn co.adp.Fill(co.ds, "employees");rn DataColumn[] Pmykey = new DataColumn[1]; //宣告新主索引栏位阵列rn Pmykey[0] = co.ds.Employees.EmployeeIDColumn;rn co.ds.Employees.PrimaryKey = Pmykey; //加入主键rn rnAllemployees.DataSource=co.ds.Employees.DefaultView; ==有错!!!rn Allemployees.DataMember="employees";rn Allemployees.DataBind();rn
异常详细信息: System.NullReferenceException: 未将对象引用设置对象实例。 该怎么写啊?哥哥们帮帮忙啊
<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 310: string t=List1.Items[i].Text;rn行 311: string v=List1.Items[i].Value;rn行 312: htmlcode.Replace("[^"+t+"^]",v); ]=htmlcode;rn行 314: rn rn
COOKIES的System.NullReferenceException: 未将对象引用设置对象实例
<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。 rn说明: 执行当前 Web 请求期间,出现未处理的<em>异常</em>。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<em>详细信息</em>。 rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 14: protected void Page_Load(object sender, EventArgs e)rn行 15: rn行 16: string ck = Request.Cookies["Ly_Cookies"]["Ly_UserName"].ToString();rn行 17: if (ck == null)rn行 18: rn rnrn源文件: e:\自写.NET\xingerxd\Admin_Index.aspx.cs 行: 16 rnrn堆栈跟踪: rnrnrn[NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。]rn Admin_Index.Page_Load(Object sender, EventArgs e) in e:\自写.NET\xingerxd\Admin_Index.aspx.cs:16rn System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15rn System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34rn System.Web.UI.Control.OnLoad(EventArgs e) +99rn System.Web.UI.Control.LoadRecursive() +47rn System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061rnrn rnrnrnrnrnrn以上是错误的代码rnResponse.Cookies["Ly_Cookies"]["Ly_UserName"] = UserName.Trim();rnResponse.Cookies["Ly_Cookies"]["Ly_UserPurview"] = dr["UserPurview"].ToString();rnrn<em>这个</em>是登录成功后写入的COOKIES,包括用户名和权限rnrn如果是通过登录页面转过去的话,那么就能正常显示rn但是如果是在地址栏里面直接输入需要验证页面的话,比如admin_index.aspxrn那么就会出现错误,错误以上,rn string AdminName = Request.Cookies["Ly_Cookies"]["Ly_UserName"];rnrn这样都有错么,整了我一天的问题了,
System.NullReferenceException: '未将对象引用设置对象实例。'
刚学不久,自己写一个小项目,出现了<em>这个</em><em>异常</em>rn不知道是不是Session["UserId"]引起的rn上网搜到一些<em>解决</em>方法试了试还是不成功rn想请大家帮忙看一看rnrnController下的ActionResultrn //Update Picturern [HttpPost]rn public ActionResult UpdatePicture(PictureVM obj)rn rn int userId = Convert.ToInt32(Session["UserId"]);rn if (userId == 0)rn rn return RedirectToAction("Login", "Account");rn rnrn var file = obj.Picture;rn User u = db.Users.Find(userId);rn if( file != null)rn rn //update the imgrn var extension = Path.GetExtension(file.FileName);rn string id_and_extension = userId + extension;rn string imgUrl = "~/Profile_Images/" + id_and_extension;rn u.ImageUrl = imgUrl;rn db.Entry(u).State = EntityState.Modified; //*rn db.SaveChanges();rnrn var path = Server.MapPath("~/Profile_Images/");rn if (!Directory.Exists(path))rn rn Directory.CreateDirectory(path + id_and_extension);rn rn //when update new img, delete old imgrn if ((System.IO.File.Exists(path + id_and_extension))) //imgUrlrn rn System.IO.File.Delete(path + id_and_extension);rn rn file.SaveAs((path + id_and_extension));rn rn return RedirectToAction("UserProfile");rn rn```rnUserProfile.cshtml下关于ImageUrl的部分rn rn @Html.DisplayNameFor(model => model.ImageUrl)rn rn rn @*@if(Model.ImageUrl.Length > 0)*@rn @*System.NullReferenceException: '<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。'rn ClairG.ChatApp.Domain.Entities.User.ImageUrl.get returned null.*@rn @if (Model.ImageUrl != null) //无法保存图片rn rn rn rn rn @using (Html.BeginForm("UpdatePicture", "User", FormMethod.Post,rn new enctype = "multipart/form-data" ))rn rn rn rn rn rn```
System.NullReferenceException: 未将对象引用设置对象实例
<em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。 rn说明: 执行当前 Web 请求期间,出现未经处理的<em>异常</em>。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<em>详细信息</em>。 rnrn<em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。rnrn源错误: rnrnrn行 69: );rn行 70: con.Open();rn行 71: string sql = "select * from [Check] where userName='" + Session["UserName"].ToString() + "'";rn行 72: SqlDataAdapter da = new SqlDataAdapter(sql, con);rn行 73: DataSet ds = new DataSet();rn rnrn源文件: d:\新\Web\0529\userwork\Check.aspx.cs 行: 71 rnrn
提示“System.NullReferenceException: 未将对象引用设置对象实例。”
rnrn rnrn为什么提示“System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。
System.NullReferenceException: 未将对象引用设置对象实例,错误!
OracleConnection oOracleConn = new OracleConnection();rn oOracleConn.ConnectionString ="Data Source=AGENTDB;User Id=agentdba;Password=icbcsg;Integrated Security=no;";rn rn string sqlstr="select distinct BRANCH_NO from gz_users_info "; rn OracleCommand cmd=new OracleCommand(sqlstr,oOracleConn);rn oOracleConn.Open(); rnrn OracleDataReader Ord=cmd.ExecuteReader();rnrn DropDownList ddl=(DropDownList)e.Item.FindControl("DropDownList1");rn ddl.DataSource=Ord;rn ddl.DataValueField="branch_no";rn ddl.DataTextField="branch_no";rn ddl.DataBind();rn Ord.Close();rn oOracleConn.Close();rn上面的代码在ddl.DataSource=Ord;处报System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>错误,<em>怎么</em>来<em>解决</em>?rn谢谢!rn
System.NullReferenceException: 未将对象引用设置对象实例。???
rnvs 2008+sql 2005 rnrnrn rnweb.config :rn rnrnrnstring connectionStringS=ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString; rn <em>异常</em><em>详细信息</em>: System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。???
System.NullReferenceException: 未将对象引用设置对象实例
[code=C#]rnusing (SPWeb web = site.OpenWeb(webID))rn rn SPList list = web.Lists[listID];rn SPListItem item = list.GetItemById(itemID); //取到想要<em>设置</em>的记录rn if ("UserMulti" == field.TypeAsString) //判断该字段是否<em>设置</em>了“允许多重选择”rn rn SPFieldUserValueCollection members = (SPFieldUserValueCollection)item[field.Title]; //取出所有数据内容rn foreach (SPFieldUserValue member in members)rn rn if (member.User != null) //判断该<em>对象</em>是否是用户类型rn rn principal.AddUser(member.User); //添加用户rn rn elsern rn tryrn rn SPGroup group = web.SiteGroups[member.LookupValue]; //获取用户组rn principal.AddGroup(group); //添加用户组rn rn catchrn rn continue;rn rn rn rn rn[/code]rnrn在foreach | 这里报错:System.NullReferenceException: <em>未将</em><em><em>对象</em>引用</em><em>设置</em>到<em>对象</em>的<em>实例</em>。
System.NullReferenceException: 未将对象引用设置对象实例错误???
page_load事件中rnif (!Page.IsPostBack)rn rn ds = new DataSet();rn string path = Server.MapPath("AccpCash.xml");rn ds.ReadXml(path);rn foreach (DataRowView dr in ds.Tables[0].DefaultView)rn rn ddltype.Items.Add(dr["name"].ToString());rn rn ddltype.SelectedIndex = 0;rn rnrnonclick事件中rn 运行到:rn DataRow dr = ((DataRow[])ds.Tables[0].Select("name='" + ddltype.SelectedItem.Text + "'"))[0]; 就报 <em>这个</em>错rn
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