linq udpate：「找不到或更改的行」。例外。請幫助！

當我嘗試更新或刪除一個選定的項目時，它會拋出「未找到或更改的行」。例外。基本上我只做了一個linq查詢並使用了大部分自動生成函數。我添加了LinqDataSource1_ContextCreated函數，但它沒有幫助。linq udpate：「找不到或更改的行」。例外。請幫助！

請幫幫我！提前致謝！

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
       AutoGenerateDeleteButton="True" AutoGenerateEditButton="True" 
       DataSourceID="LinqDataSource1" Width="100%" 
       onrowdatabound="GridView1_RowDataBound"> 
     <Columns> 
      <asp:BoundField DataField="JobId" HeaderText="JobId" ReadOnly="True" /> 
      <asp:BoundField DataField="JobTitle" HeaderText="JobTitle" /> 
      <asp:BoundField DataField="Summary" HeaderText="Summary"/> 
      <asp:BoundField DataField="Detail" HeaderText="Detail" /> 
      <asp:BoundField DataField="CompanyName" HeaderText="CompanyName" /> 
      <asp:BoundField DataField="CompanyEmail" HeaderText="CompanyEmail" /> 
      <asp:CheckBoxField DataField="IsTop" HeaderText="IsTop" /> 
      <asp:CheckBoxField DataField="IsShown" HeaderText="IsShown" /> 
       <asp:BoundField DataField="PostDate" HeaderText="PostDate" 
       ApplyFormatInEditMode="True" DataFormatString="{0:MMM,dd,yy}" 
       HtmlEncode="False" ReadOnly="True"/> 
     <asp:BoundField DataField="UserName" HeaderText="UserName" ReadOnly="True"/> 

    </Columns> 
</asp:GridView> 
<asp:LinqDataSource ID="LinqDataSource1" runat="server" 
      ContextTypeName="JobPostDataContext" EntityTypeName="" 
      onselecting="LinqDataSource1_Selecting" TableName="JobLists" 
      EnableDelete="True" EnableUpdate="True" > 
      </asp:LinqDataSource> 

    protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e) 
    { 
     JobPostDataContext db = new JobPostDataContext(); 

     var query = from uM in db.aspnet_Memberships 
        join uD in db.UserDetails 
        on uM.UserId equals uD.UserId 
        join u in db.aspnet_Users 
        on uM.UserId equals u.UserId 
        join jL in db.JobLists 
        on uM.UserId equals jL.UserId 
        where u.UserName == Request.QueryString["UserName"] 

        select new 
        { 
         jL.JobId, 
         jL.JobTitle, 
         jL.Summary, 
         jL.Detail, 
         jL.CompanyName, 
         jL.CompanyEmail, 
         jL.PostDate, 
         jL.IsTop, 
         jL.IsShown, 
         u.UserName 
        }; 

     e.Result = query; 
    } 

    protected void LinqDataSource1_ContextCreated(object sender, LinqDataSourceStatusEventArgs e) 
    { 

     JobPostDataContext db = e.Result as JobPostDataContext; 

     System.Data.Linq.DataLoadOptions dl = new System.Data.Linq.DataLoadOptions(); 

     dl.LoadWith<JobList>(d => d.JobId); 

     db.LoadOptions = dl; 

    }

未找到或改變行。描述：執行當前Web請求期間發生未處理的異常。請查看堆棧跟蹤以獲取有關該錯誤的更多信息以及源代碼的位置。

異常詳細信息：System.Data.Linq.ChangeConflictException：找不到或更改了行。

源錯誤：

在當前web請求的執行過程中生成未處理的異常。關於異常的來源和位置的信息可以使用下面的異常堆棧跟蹤來標識。

堆棧跟蹤：

[ChangeConflictException: Row not found or changed.]
System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode) +996823
System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode) +378
System.Data.Linq.DataContext.SubmitChanges() +23 System.Web.UI.WebControls.LinqToSqlWrapper.SubmitChanges(DataContext dataContext) +9
System.Web.UI.WebControls.LinqDataSourceView.UpdateDataObject(Object dataContext, Object table, Object oldDataObject, Object newDataObject) +115 System.Web.UI.WebControls.LinqDataSourceView.UpdateObject(Object oldEntity, Object newEntity) +262
System.Web.UI.WebControls.QueryableDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +115
System.Web.UI.WebControls.ContextDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +100
System.Web.UI.WebControls.LinqDataSourceView.ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues) +41
System.Web.UI.DataSourceView.Update(IDictionary keys, IDictionary values, IDictionary oldValues, DataSourceViewOperationCallback callback) +95
System.Web.UI.WebControls.GridView.HandleUpdate(GridViewRow row, Int32 rowIndex, Boolean causesValidation) +1226
System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup) +716
System.Web.UI.WebControls.GridView.OnBubbleEvent(Object source, EventArgs e) +95
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
System.Web.UI.WebControls.GridViewRow.OnBubbleEvent(Object source, EventArgs e) +121
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
System.Web.UI.WebControls.LinkButton.OnCommand(CommandEventArgs e) +125
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +169
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +9
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +176
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

來源

2011-03-19 jenifer

你爲什麼不設置

EntityTypeName="JobLists"

，然後在選擇選擇JL？

即：

protected void LinqDataSource1_Selecting(object sender, LinqDataSourceSelectEventArgs e) 
{ 
    JobPostDataContext db = new JobPostDataContext(); 

    var query = from uM in db.aspnet_Memberships 
       join uD in db.UserDetails 
       on uM.UserId equals uD.UserId 
       join u in db.aspnet_Users 
       on uM.UserId equals u.UserId 
       join jL in db.JobLists 
       on uM.UserId equals jL.UserId 
       where u.UserName == Request.QueryString["UserName"] 

       select jl; 


    e.Result = query; 
}

來源

2011-03-19 11:54:22 Nix

linq udpate：「找不到或更改的行」。例外。請幫助！

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