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  • How do you cast a LinqToSql Table<TEntity> as a Table<IEntity> where TEntity : IEntity?

    - by DanM
    I'm trying to use DbLinq with a SQLite database, but I'm running into a problem when I try to cast an ITable as a Queryable<TEntity>. There is a known bug in DbLinq (Issue 211), which might be the source of my problem, but I wanted to make sure my code is sound and, if it is, find out if there might be something I can do to work around the bug. Here is the generic repository method that attempts to do the cast: public IQueryable<TEntity> GetAll() { return Table.Cast<TEntity>(); // Table is an ITable } This compiles, but if I pass in the interface IPerson for TEntity and the type of the entities in the table is Person (where Person : IPerson), I'm getting this error from DbLinq: S0133: Implement QueryMethod Queryable.Cast. Why am I trying to do this? I have a library project that doesn't know the type of the entity until runtime, but it does know the interface for the entity. So, I'm trying to cast to the interface type so that my library project can consume the data. Questions: Am I attempting an impossible cast or is this definitely a bug in DbLinq? How else could I go about solving my problem?

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  • How to perform a Linq2Sql query on the following dataset

    - by Bas
    I have the following tables: Person(Id, FirstName, LastName) { (1, "John", "Doe"), (2, "Peter", "Svendson") (3, "Ola", "Hansen") (4, "Mary", "Pettersen") } Sports(Id, Name) { (1, "Tennis") (2, "Soccer") (3, "Hockey") } SportsPerPerson(Id, PersonId, SportsId) { (1, 1, 1) (2, 1, 3) (3, 2, 2) (4, 2, 3) (5, 3, 2) (6, 4, 1) (7, 4, 2) (8, 4, 3) } Looking at the tables, we can conclude the following facts: John plays Tennis John plays Hockey Peter plays Soccer Peter plays Hockey Ola plays Soccer Mary plays Tennis Mary plays Soccer Mary plays Hockey Now I would like to create a Linq2Sql query which retrieves the following: Get all Persons who play Hockey and Soccer Executing the query should return: Peter and Mary Anyone has any idea's on how to approach this in Linq2Sql?

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  • speed: XmlTextReader vs LinqtoXml

    - by Michel
    Hi, i'm about to read some xml (who isn't :-)) This time however it's a lot of data: about 30.000 records with 5 properties, all in one file. Till now i've always read that the XmlTextReader is the fastest way to read xml data, but now there also is the (nice sytax of) linqtoXml. Does anybody know any performance issues, or that there aren't any, with LinqToXml? Michel

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  • Complex sorting of XML subnodes in .Net3.5 onwards

    - by MicMit
    XML structure expressed in Xpath kind of Records/Record/Actions/Action/ActionDate the other node on the same level Records/Record/Actions/Action/CTCDate Is there easy or not easy way to sort it on "order by ActionDate,CTCDate" ( in SQL notation ), but per Actions for each selected Record when we iterate somehow ( not per XML file ). File around 50M

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  • What is your favorite way to read XML files using C#?

    - by stacker
    Let's take this xml structure as example: <?xml version="1.0" encoding="utf-8"?> <Configuration-content> <XFile Name="file name 1" /> <XFile Name="name2" /> <XFile Name="name3" /> <XFile Name="name4" /> </Configuration-content> public class Configuration { public XFile[] Files { get; set; } } public interface IConfigurationRipository { Configuration Get(); void Save(Configuration entity); } I wonder what's the best way to do that. The task is to implement IConfigurationRipository using your favorite approach.

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  • IE won't load PDF in a window created with window.open

    - by Dean
    Here's the problem, which only occurs in Internet Explorer (IE). I have a page that has links to several different types of files. Links from these files execute a Javascript function that opens a new window and loads the specific file. This works great, unless the file I need to open in the new window is a PDF in which case the window is blank, even though the URL is in the address field. Refreshing that window using F5 doesn't help. However, if I put the cursor in the address field and press <enter> the PDF loads right up. This problem only occurs in IE. I have seen it in IE 7 and 8 and am using Adobe Acrobat Reader 9. In Firefox (PC and Mac) everything works perfectly. In Chrome (Mac), the PDF is downloaded. In Safari (Mac) it works. In Opera (Mac) it prompts me to open or save. Basically, everything probably works fine, except for IE. I have searched for similar problems and have seen some posts where it was suggested to adjust some of the Internet Options on IE. I have tried this but it doesn't help, and the problem wasn't exactly the same anyway. Here's the Javascript function I use to open the new window. function newwin(url,w,h) { win = window.open(url,"temp","width="+w+",height="+h+",menubar=yes,toolbar=yes,location=yes,status=yes,scrollbars=auto,resizable=yes"); win.focus(); } You can see that I pass in the URL as well as the height, h, and width, w, of the window. I've used a function like this for years and as far as I know have never had a problem. I call the newwin() function using this. <a href="javascript:newwin('/path/document.pdf',400,300)">document.pdf</a> (Yes, I know there are other, better ways than using inline JS, and I've even tried some of them because I've run out of things to try, but nothing works.) So, if anyone has an idea as to what might be causing this problem, I'd love to hear it.

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  • How to find out if an object's type implements IEnumerable<X> where X derives from Base using Reflec

    - by Dave Van den Eynde
    Give a base class "Base", I want to write a method Test, like this: private static bool Test(IEnumerable enumerable) { ... } such that Test returns true if the type of o implements any interface of IEnumerable where X derives from Base, so that if I would do this: public static IEnumerable<string> Convert(IEnumerable enumerable) { if (Test(enumerable)) { return enumerable.Cast<Base>().Select(b => b.SomePropertyThatIsString); } return enumerable.Cast<object>().Select(o => o.ToString()); } ...that it would do the right thing, using Reflection. I'm sure that its a matter of walking across all the interfaces of the type to find the first that matches the requirements, but I'm having a hard time finding the generic IEnumerable< among them. Of course, I could consider this: public static IEnumerable<string> Convert(IEnumerable enumerable) { return enumerable.Cast<object>().Select(o => o is Base ? ((Base)o).SomePropertyThatIsString : o.ToString()); } ...but think of it as a thought experiment.

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  • How to write Sql or LinqToSql for this scenario?

    - by Mike108
    How to write Sql or LinqToSql for this scenario? A table has the following data: Id UserName Price Date Status 1 Mike 2 2010-4-25 0:00:00 Success 2 Mike 3 2010-4-25 0:00:00 Fail 3 Mike 2 2010-4-25 0:00:00 Success 4 Lily 5 2010-4-25 0:00:00 Success 5 Mike 1 2010-4-25 0:00:00 Fail 6 Lily 5 2010-4-25 0:00:00 Success 7 Mike 2 2010-4-26 0:00:00 Success 8 Lily 5 2010-4-26 0:00:00 Fail 9 Lily 2 2010-4-26 0:00:00 Success 10 Lily 1 2010-4-26 0:00:00 Fail I want to get the summary result from the data, the result should be: UserName Date TotalPrice TotalRecord SuccessRecord FailRecord Mike 2010-04-25 8 4 2 2 Lily 2010-04-25 10 2 2 0 Mike 2010-04-26 2 1 1 0 Lily 2010-04-26 8 3 1 2 The TotalPrice is the sum(Price) groupby UserName and Date The TotalRecord is the count(*) groupby UserName and Date The SuccessRecord is the count(*) groupby UserName and Date where Status='Success' The FailRecord is the count(*) groupby UserName and Date where Status='Fail' The TotalRecord = SuccessRecord + FailRecord The sql server 2005 database script is: /****** Object: Table [dbo].[Pay] Script Date: 04/28/2010 22:23:42 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Pay]') AND type in (N'U')) BEGIN CREATE TABLE [dbo].[Pay]( [Id] [int] IDENTITY(1,1) NOT NULL, [UserName] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL, [Price] [int] NULL, [Date] [datetime] NULL, [Status] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL, CONSTRAINT [PK_Pay] PRIMARY KEY CLUSTERED ( [Id] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ) END GO SET IDENTITY_INSERT [dbo].[Pay] ON INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (1, N'Mike', 2, CAST(0x00009D6300000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (2, N'Mike', 3, CAST(0x00009D6300000000 AS DateTime), N'Fail') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (3, N'Mike', 2, CAST(0x00009D6300000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (4, N'Lily', 5, CAST(0x00009D6300000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (5, N'Mike', 1, CAST(0x00009D6300000000 AS DateTime), N'Fail') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (6, N'Lily', 5, CAST(0x00009D6300000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (7, N'Mike', 2, CAST(0x00009D6400000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (8, N'Lily', 5, CAST(0x00009D6400000000 AS DateTime), N'Fail') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (9, N'Lily', 2, CAST(0x00009D6400000000 AS DateTime), N'Success') INSERT [dbo].[Pay] ([Id], [UserName], [Price], [Date], [Status]) VALUES (10, N'Lily', 1, CAST(0x00009D6400000000 AS DateTime), N'Fail') SET IDENTITY_INSERT [dbo].[Pay] OFF

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  • How do I get a list of child elements from XDocument object?

    - by Nick
    Hello.. I am trying to get all of the "video" elements and their attributes from an XML file that looks like this: <?xml version="1.0" encoding="utf-8" ?> <videos> <video title="video1" path="videos\video1.wma"/> <video title="video2" path="videos\video2.wma"/> <video title="video3" path="videos\video3.wma"/> </videos> The following will only select the root node and all of the children. I would like to get all of the 'video' elements into the IEnumerable. Can someone tell me what I'm doing wrong? IEnumerable<XElement> elements = from xml in _xdoc.Descendants("videos") select xml; The above returns a collection with a length == 1. It contains the root element and all the children.

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  • Good way to get the key of the highest value of a Dictionary in C#

    - by Arda Xi
    I'm trying to get the key of the maximum value in the Dictionary<double, string> results. This is what I have so far: double max = results.Max(kvp => kvp.Value); return results.Where(kvp => kvp.Value == max).Select(kvp => kvp.Key).First(); However, since this seems a little inefficient, I was wondering whether there was a better way to do this.

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  • How to start new browser window in cpecified location whith cpecified size

    - by Pritorian
    Hi all! I create a new instance and trying to resize new instance of browser like this: [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern bool GetWindowInfo(IntPtr hwnd, ref tagWINDOWINFO pwi); [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct tagRECT { /// LONG->int public int left; /// LONG->int public int top; /// LONG->int public int right; /// LONG->int public int bottom; } [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)] public struct tagWINDOWINFO { /// DWORD->unsigned int public uint cbSize; /// RECT->tagRECT public tagRECT rcWindow; /// RECT->tagRECT public tagRECT rcClient; /// DWORD->unsigned int public uint dwStyle; /// DWORD->unsigned int public uint dwExStyle; /// DWORD->unsigned int public uint dwWindowStatus; /// UINT->unsigned int public uint cxWindowBorders; /// UINT->unsigned int public uint cyWindowBorders; /// ATOM->WORD->unsigned short public ushort atomWindowType; /// WORD->unsigned short public ushort wCreatorVersion; } [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern bool MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint); [System.Runtime.InteropServices.DllImport("user32.dll")] private static extern bool UpdateWindow(IntPtr hWnd); private void button2_Click(object sender, EventArgs e) { using (System.Diagnostics.Process browserProc = new System.Diagnostics.Process()) { browserProc.StartInfo.FileName = webBrowser1.Url.ToString(); browserProc.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Minimized; int i= browserProc.Id; tagWINDOWINFO info = new tagWINDOWINFO(); info.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(info); browserProc.Start(); GetWindowInfo(browserProc.MainWindowHandle, ref info); browserProc.WaitForInputIdle(); string str = browserProc.MainWindowTitle; MoveWindow(browserProc.MainWindowHandle, 100, 100, 100, 100, true); UpdateWindow(browserProc.MainWindowHandle); } } But I get an "No process is associated with this object". Could anyone help? Or mb other ideas how to run new browser window whith specified size and location?

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  • Opening pop up in Joomla

    - by user258100
    I am trying to have people be able to open HTML widgets by clicking on a button in my Joomla page. All the widgets are different sizes. The code is entered as HTML in Jumi. Currently I have the action set to: "On click open in new window without browser navigation." The problem is this this always opens in a full screen size with the widget showing up in a corner. How do I control the size of this new window for each widget? Thanks

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  • LinqDataSource question

    - by Abe Miessler
    Is it legal to define a default value for a parameter the way I am in the code below? It keeps throwing an "Input string was not in a correct format." error for me. Is there a different way I should be doing this? <asp:LinqDataSource ID="lds_numbers" runat="server" ContextTypeName="nrm.prop.myDataContext" TableName="Sources" Where="myNumber== @myNumber" EnableDelete="True" EnableInsert="True" EnableUpdate="True"> <WhereParameters> <asp:Parameter DefaultValue='<%= this.StateItems["myNumber"] %>' Name="myNumber" Type="Int32" /> </WhereParameters> . . .

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  • Entity Framework query

    - by carter-boater
    Hi all, I have a piece of code that I don't know how to improve it. I have two entities: EntityP and EntityC. EntityP is the parent of EntityC. It is 1 to many relationship. EntityP has a property depending on a property of all its attached EntityC. I need to load a list of EntityP with the property set correctly. So I wrote a piece of code to get the EntityP List first.It's called entityP_List. Then as I wrote below, I loop through the entityP_List and for each of them, I query the database with a "any" function which will eventually be translated to "NOT EXIST" sql query. The reason I use this is that I don't want to load all the attached entityC from database to memory, because I only need the aggregation value of their property. But the problem here is, the looping will query the databae many times, for each EntityP! So I am wondering if anybody can help me improve the code to query the database only once to get all the EntityP.IsAll_C_Complete set, without load EntityC to memory. foreach(EntityP p in entityP_List) { isAnyNotComoplete = entities.entityC.Any(c => c.IsComplete==false && c.parent.ID == p.ID); p.IsAll_C_Complete = !isAnyNotComoplete; } Thank you very much!

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  • Normalizing chains of .Skip() and .Take() calls

    - by dtb
    I'm trying to normalize arbitrary chains of .Skip() and .Take() calls to a single .Skip() call followed by an optional single .Take() call. Here are some examples of expected results, but I'm not sure if these are correct: .Skip(5) => .Skip(5) .Take(7) => .Skip(0).Take(7) .Skip(5).Skip(7) => .Skip(12) .Skip(5).Take(7) => .Skip(5).Take(7) .Take(7).Skip(5) => .Skip(5).Take(2) .Take(5).Take(7) => .Skip(0).Take(5) .Skip(5).Skip(7).Skip(11) => .Skip(23) .Skip(5).Skip(7).Take(11) => .Skip(12).Take(11) .Skip(5).Take(7).Skip(3) => .Skip(8).Take(4) .Skip(5).Take(7).Take(3) => .Skip(5).Take(4) .Take(11).Skip(5).Skip(3) => .Skip(8).Take(3) .Take(11).Skip(5).Take(7) => .Skip(5).Take(6) .Take(11).Take(5).Skip(3) => .Skip(3).Take(2) .Take(11).Take(5).Take(3) => .Skip(0).Take(3) Can anyone confirm these are the correct results to be expected? Here is the basic algorithm that I derived from the examples: class Foo { private int skip; private int? take; public Foo Skip(int value) { if (value < 0) value = 0; this.skip += value; if (this.take.HasValue) this.take -= value; return this; } public Foo Take(int value) { if (value < 0) value = 0; if (!this.take.HasValue || value < this.take) this.take = value; return this; } } Any idea how I can confirm if this is the correct algorithm?

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  • How to generate following xml

    - by Mohsan
    hi. i want to generate XML for the following tree type structure. i attached picture. generated xml should be <services> <service> <name>Service 1</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> <service> <name>Service 2</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> <service> <name>Service 3</name> <categories> <category> <name>Cateogry 1</name> <methods> <method> <name>Method 1</name> </method> </methods> </category> </categories> </service> </services>

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  • How can I tell datacontext I've updated a record via StoreProcedure

    - by Ldsenow
    Hi Geeks, I've a stroe procedure to update a record and after running it I use LinqToSql to delete the record. I know it is weird but I just want to test how smart the datacontext it is and understand how it works. Since the datacontext caches the results so any change via it can be recorded but now I use a store procedure to update something, it would not know. So when I try to delete it, an exception comes out "Row not found or changed". How I can tell the datacontext what I have updated? If I can do so the problem will sovle.

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  • Configuration Files: how to read them into models?

    - by stacker
    I have a lot of configuration files in this format: <?xml version="1.0" encoding="utf-8"?> <XConfiguration> <XFile Name="file name 1" /> <XFile Name="name2" /> <XFile Name="name3" /> <XFile Name="name4" /> </XConfiguration> I want to use ConfigurationRepository.Get to get this object populated: public class XConfiguration { public XFile[] Files { get; set; } } I wonder what is the best way to do that. LinqToXml? I don't think ConfigurationManager is a smart option for this.

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  • c# Deserializing an element based on it's parent node's name

    - by daveharnett
    The XML I'm working with has the following structure: <fixture_statistics> <home_player_1 id="2306143" teamid="2"> <element_1>Some Data</element_1> <element_2>Some Data</element_2> </home_player_1> <home_player_2 id="2306144" teamid="2"> <element_1>Some Data</element_1> <element_2>Some Data</element_2> </home_player_2> </fixture_statistics> Now the code to deserialize it would normally look like this: [XmlRootAttribute("fixture_statistics", Namespace = "", IsNullable = false)] public class FixtureRoot { [XmlElement("home_player_1")] [XmlElement("home_player_2")] public List<FixtureStats> fixtures { get; set; } } public class FixtureStats { public string element_1; [XMLElement("element_2")] public string elementTwo; } Here's the question: I'd like the FixtureStats class to have a 'position' property which corrosponds to it's parent's element name (so the FixtureStat object corrosponding to home_player_1 would have position=1). Can this be done with the built-in serialization atrributes? If it's not possible, what's the cleanest workaround? Bear in mind that each document will have about 50 player elements, each with about 50 'child' data elements.

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