ADO.NET :: Generic Linq To Sql Update Error?
Jan 20, 2011
I have implemented a generic repository patteren for performing CRUD operations against a database. Functions Insert/Delete/GetSingle works fine but update method doesn't work whenever database table consist of relationships but for standalone table it works fine.When i try to update a table with relationship i get following error:An attempt has been made to Attach or Add an entity that is not new, perhaps having been loaded from another DataContext. This is not supported.Here is my update method:
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Dec 8, 2010
I have a class Trans with various properties, including a boolean named Deleted.I have a generic list of Trans that are loaded from the database. I want to use linq to set all the Trans in this list to Deleted. Can I use linq to do this?
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May 2, 2010
I keep running into a problem when trying to connect to my web service. THe problem only occurs when I try to update the database linq to sql file. When I do this and then upload the wcf services and attempt to connect I get this error: Quote: The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.
Server stack trace: at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMess age methodCall, ProxyOperationRuntime operation)
at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at IService1.GetPollById(Int32 pollId)
at Service1Client.GetPollById(Int32 pollId)
If I then revert back to the old linq to sql file it works fine.
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Jan 5, 2010
I have a "simple" method that takes a Linq entity containing the information I want to update. The method then creates a list of counties the information is to be updated for, and tries to update the information for each county.
So user goes in fills form out selects update All counties, and the information in the form should be updated for all the counties for the member. Here is the code.
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The first pass through the foreach runs perfectly, the second time through I get an error: Cannot attach an entity that already exists.
What is best way to work around this?
I have though about putting the foreach loop in my business_logic layer, and have it pass both the newRecord and OldRecord, but figured I would ask, before making the code change.
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Nov 23, 2010
I have declared a simple class
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And Pass some values to it :
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Then I use Linq to select rows :
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How I can enumerate it?! I used this, but it has error
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Nov 16, 2010
I'm having trouble doing a left outer join with multiple generic lists tables. I've been researching for hours and there isn't a whole lot out there on this subject and VB (at least what I found).
I have the following Linq query:
Dim DataForGridview = (From s In S1 _
Join c In C1 On c.ID Equals s.ID _
Join v In V1 On v.ID Equals s.ID _
Select New With { _
.dataFieldID = s.ID, _
.dataField1 = s.dataField1, _
.dataField2 = c.dataField2, _
.dataField3 = c.dataField3, _
.dataField4 = c.dataField4, _
.dataField5 = v.dataField5 _
}).ToList()
S1 has a count of 30. V1 has a count of 20. C1 has a count of 10. This query joins the three but ends up with a count of only 10 based on the datakey ID and, of course, only shows those 10 in the gridview.
I would like to show all 30 from S1 in the gridview with blank fields wherever V1 and C1 do not have data. From what I've read I need to do a left outer join. However, all examples I've found are with two datasets.
I've tried multiple times expanding on what I've found by changing it to a group join and also adding the .DefaultIfEmpty() property in the query, but nothing is working.
How can I change the above query to a left outer join with these multiple tables?
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Mar 11, 2010
error "ObjectDataSource 'ObjectDataSourceCaseDetails' could not find a non-generic method". I have an update method and my ObjectDataSource is hooked up to the method in my BLL. review my code below
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Jan 26, 2011
I try to update the detailview control. got this error messsage.
ObjectDataSource 'odsDetail' could not find a non-generic method 'Update' that has parameters: hospitalID, hospitalName, taxID, address1, address2, city, state, zip.
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here's my edit function
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Nov 30, 2010
I have a following generic list method that contains some data for a gridview. I need to supply edit and delete functionality for it.
List<students> List(string id)
{
List<students> st = new List<students>();
[code]...
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Mar 23, 2013
I tried this link to generate verification Image [URL] ..... It works fine.
But I'd like to put a button in page for regenerating captcha for example. When the image was unreadable for user.
So I put an updatepanel in page and this is my code:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<tr> <td colspan="2">
<asp:Image ID="imCaptcha" ImageUrl="~/Captcha.ashx" runat="server" />
[Code] .....
Although the image changes but the whole page is refreshed. Whether this is due to incompatibilities httphandler and updatepanel?
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Apr 1, 2010
I'm trying to use a Generic list for my class but I'm getting this error "Conversion from type 'EnumerableQuery(Of VB$AnonymousType_105(Of String))' to type 'String' is not valid."
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-imperialx
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Apr 27, 2010
I am creating a generic list of objects using this syntax:
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Mar 7, 2011
I am binding dropdown list using Object data source. I got an error like this
"ObjectDataSource 'objDSStatus' could not find a non-generic method 'GetIssueAllowedStatusByCategoryIDStatusIDandUserType' that has parameters: IssueCategoryID."
My code is as follows .aspx
< asp:DropDownList ID="ddlStatus" runat="server" DataSourceID="objDSStatus"
DataTextField="IssueStatusName" DataValueField="IssueStatusID">
< /asp:DropDownList>
< asp:ObjectDataSource ID="objDSStatus" runat="server" TypeName="DA"></asp:ObjectDataSource>
.cs
private void Bind(int IssueCategoryID, int IssueStatusID, int UserType)
{
ddlStatus.Items.Clear();
objDSStatus.SelectMethod = "GetIssueAllowedStatusByCategoryIDStatusIDandUserType";
objDSStatus.SelectParameters.Clear();
objDSStatus.SelectParameters.Add("IssueCategoryID", IssueCategoryID.ToString());
objDSStatus.SelectParameters.Add("IssueStatusID", IssueStatusID.ToString());
objDSStatus.SelectParameters.Add("UserType", UserType.ToString());
objDSStatus.DataBind();
ddlStatus.DataBind();
}
DA.cs
public List<IssueStatus> GetIssueAllowedStatusByCategoryIDStatusIDandUserType(int IssueeCategoryID, int IssueStatusID, int UserType)
{
List<IssueStatus> issueStatusList = new List<IssueStatus>();
}
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May 12, 2010
When I enter the full hard disk path as a parameter of the method Image.Save, I get no error and the file is being saved on the desired location. But I want the image saved inside Web project folder of the application so I use this code:
myImage.Save(Server.MapPath("SomeApp.Web/report.png"), System.Drawing.Imaging.ImageFormat.Png);
and then I get the following error. Logically, this path is OK, so why error?! PS. myImage is of type System.Drawing.Image.
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Oct 5, 2010
For an MVC 2 app that relies on many partial views and almost exclusively uses Ajax for POSTs/GETs, what would be the best way to implement the setting, passing, retrieval and display (using a JavaScript modal) of these messages?
My forms all POST (by way of jQuery $.ajax) to actions that return partial views (html) that are used to update a in the "success:" part of the $.ajax function.
I was hoping for some sort of mechanism in the master view that could "listen" for any messages that any of these partial views might be "delivering"--through their ViewData, for instance.
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Nov 11, 2010
I'm trying to upload and resize an image. The file will be uploaded and saved to the database, but it will not be resized. I get the error "Geniric error in GDI++" . I have this code.
[Code]....
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Mar 25, 2010
We are using two load balancing server for asp.net site in that we have a functionality which will create a receipt of order in pdf using abcpdf component it was working fine without load balancing server and but when we move it to load balancing server it is giving errors like. A generic error occurred in GDI. I have given full rights to directory which is used but still there problem. Does anybody have a solutions for this.
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Feb 10, 2010
I have write a simple generic handler with VB as the language.
I am then trying to access the static properties of the handler via an aspx page using <%= handlerclassname.propname %> code.
However it is failing to compile. The compiler throws an error Name HandlerClassname is not declared.
I have checked in my code about namespace or something like that, but there aren't any.
Compilation option in web.config is
<compilation
debug="true"
strict="true"
explicit="true">
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May 7, 2015
I am getting exception on server when saving chapcha image in forder
A generic error occurred in GDI+. But is is working fine in local server without any error.
my codes .
using (Bitmap bitmap = new Bitmap(106, 35))
{
string imgCaptchaToSave = string.Empty;
string captchaText = Guid.NewGuid().ToString().Substring(0, 6);
[Code].....
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May 7, 2015
Below is the code for "Upload" button when uploading any file:
if (contenttype != String.Empty) {
if (File.Exists(Server.MapPath("~/Folder/'" + Txt.Text + "'/") + filename)) {
LMsg.Visible = true;
LMsg.ForeColor = Color.Red;
LMsg.Text = "File name '" + filename + "' already exist. Please change the File name to save this file";
[Code] ....
File upload control allows maximum file size is 4MB. If file size increase to 4MB it shows error page like "the page can not displayed".
I want to increase the size of uploaded files to max 10 MB not more than that. If file size increase to 10MB, it should show message.
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Aug 9, 2012
I use validation control in my page when users click on button if they don't enter data in textboxs it show massage in validation control
I want In addition to using validation control when users click on button to insert data  it show error massage thar show EX: "please complete your form"
How I can do it ?
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Apr 20, 2010
I've added the Dynamic.cs file to my project and have set it's Build Action = Compile in order to get the System.Linq.Dynamic namespace.
However, when I try to use any of the new code I am getting an ambiguous call error; see below.
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Feb 5, 2010
I can have a base class for views in an MVC project like this:
public class BaseViewPage : System.Web.Mvc.ViewPage
{
public string Something { get; set; }
}
And then in the ASPX I can do this:
<%@ Page Something="foo" Language="C#" Inherits="MyNamespace.BaseViewPage" %>
This works fine; the problem is when I try to do the same with the generic version:
public class BaseViewPage<TModel> : System.Web.Mvc.ViewPage<TModel> where TModel : class
{
public string Something { get; set; }
}
When I try to use this from the ASPX, like this:
<%@ Page Something="foo" Language="C#" Inherits="MyNamespace.BaseViewPage<SomeClass>" %>
I get the error message:
Error parsing attribute 'something': Type 'System.Web.Mvc.ViewPage' does not have a public property named 'something'.
Notice how it tries to use System.Web.Mvc.ViewPage rather than my BaseViewPage class. To make it more interesting, if I remove the "Something" attribute from the Page directive and put some code in the generic version of BaseViewPage (OnInit for example) the class is actually called / used / instantiated.
So, am I doing something wrong or is this a limitation.
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Nov 25, 2010
I'm trying to create a control out of a class I found, and one of the overridden functions is the following:
protected override void PerformDataBinding(IEnumerable data)
However, when I try to build the control I'm getting the error as shown in the subject. I've tried searching, and it seems the signature for the original function matches the one I have, and all other solutions I've seen uses the same signature.
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Oct 30, 2010
What is the difference between generic and non-generic collection?
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