Generate Dynamic LINQ Query In SharePoint
Nov 25, 2010
I have a page with filters and accordingly to what the user selects, it has to generate a query. I'm using this code:
[code]....
However Linq-To-Sharepoint doesn't convert most of this to CAML and the list I'm querying has more than 50000 items. It takes about 4-8 seconds to retrieve the items which is not acceptable.
I've been trying to generate a dynamic query but so far I haven't been able to get it to work.
With AND and OR operations to generate the query I could put all those conditions on code and increase performance.
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Nov 29, 2010
Is it possible to generate dynamic LINQ statements? I need to be able to build conditional "WHERE" clauses for some of my LINQ statements. I don't want to write a giant block of code to hand every possible combination of filters, sorts and groups. I found a article online that outlines how to use string based where clauses here. Does LINQ in framework 4.0 no longer support this? Every example I've found has giant walls of virtually unreadable, must likely unmaintainable code.
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Feb 11, 2011
I want to use "if statement" in Linq query. How can I do this situation?
For example:
if txtAge.Text=="", I will not use that in Linq Query.
else txtAge.Text!="", I will use that in Linq Query.
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Jan 17, 2011
I have a table created on the fly. The table structure is dynamic.
This is the table structure generated by the end of year 2010
DealerCode, 201010, 201011, 201012
This is the table structure generated by the end of Jan 2011
DealerCode, 201011, 201012, 201101
What I need to do is selecting all data and then bind it into a gridview
To build a LINQ query, we need to drag the table into dbml file first. As we don't know how the table look like, can we add it in dynamically? Are there any other solutions?
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Sep 20, 2010
I am writing a function in which i generate autocode in specific format i want to make this function generalize so that i send tablename and columnname parameter and function return the next code. I am using linq to sql with MVC e.g. i want to make table name and column name dyanamic
[Code]....
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Dec 4, 2010
I have this query for getting data through Entity Framework, which works today. Thing is, i want to create the query dynamically, i.e build it up in blocks, but i can't figure out how exactly to do it. I believe if i can somehow save one of the values that i retrieve in the beginning i can do it, but now i retrieve it twice (probably a bit slow as well? Unless the compiler fixes it before quering). Makes sense? Here is the LINQ:
[code]....
I.e based on if various variables have values.
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Sep 9, 2010
is it possible to make a Linq query dynamic in the following pseduo code (to show what I'm trying to do)
[Code]....
where a2 and a3 and a4 are being populated from user controls and only one will apply. So query is done by state, zip or by city, but not by more than one, so the other two would be null. So the operator is really "OR" but I haven't found anything on a "or" or "whereOr" operator.
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Jan 12, 2011
I have two text boxes for the user to enter UserName & First Name, both these fields are optional and not mandatory to fill.
once the user presses the Search button, i execute the following query to fetch matching records.
[Code]....
The problem is, in cases where User leaves both the textbox or one of the textbox empty/blank, in that case that particular field should be removed from where clause.
More like if something is entered then search for that particular record otherwise search for all the records.
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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.
[Code]....
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May 28, 2010
I'm looking to translate an SQL query into linq
INNER JOIN Usrs ON
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I'm not sure how to include the "AND" in the LINQ statement.
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Aug 1, 2010
I am using VSTS 2008 + C# + .Net 3.5 + ASP.Net + SharePoint Server Enterprise 2007 on IIS 7.0 with Windows Server 2008 Enterprise.
I am currently using queryex web serivces API to get matched query results for a specific query. My question is, how to get the number of matched query results without returning the whole query results? I only need the number of matched query results.
[URL]
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Aug 22, 2010
1. I have a GridView on my page and it uses sqldatasource with parameterized query. What I want to do is, on page load (where nothing has been selected so no parameter supplied), I want it to query everything (something like SELECT * FROM [this_table]) but since my SelectCommand is something like
SELECT * FROM [this_table] WHERE [this_column] = @someParameters AND [that_column] = @someParameters.
Can I play around with default value to achieve something like that but how ? Now, when the page loads, it doesn't show anything (No Gridview).
2. On my page, I made something like (username, gender, address, and more) and one single search button. That means, no single control enable auto postback. What I am trying to accomplish is building dynamic query
(if username specifed -> SELECT * FROM [this_table] WHERE [username] LIKE @username).
If both username and gender are specified (SELECT * FROM [this_table] WHERE [username] LIKE @username AND [gender] = @gender) and you know the rest. How can I do this using GridView and SqlDataSource ? To my knowledge, I can only specify one SELECT statement in a sqldatasource.
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Sep 14, 2010
I've build a linq query.But i want a random selection so its not always ID : 1,2,3,4,5,6 How can i randomize this var? I like to bind it to a repeater.//TagCloud:
Random rand = new Random();
var tc1 = from i in JumpTide.cms.menu.GetMenuItems(32)
select new
[code]...
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Mar 10, 2010
select Groupid,GroupName,onorusername from palgroup where groupid in (select distinct Groupid
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Sep 1, 2010
I'm trying to do dynamic switching of the master page in SharePoint 2007 publishing site.
I'm following this example which uses a HTTP Module [URL]
Here is my code
public class SwitchMasterPage : IHttpModule
{
public void Dispose()
{
}........
Everything is working fine when the current page type is an Application Page, however when the page type is a Publishing page (e.g. BlueBand.master) the page_PreInit procedure is never called - it is still being registered with the event handler though.
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Dec 24, 2010
We would like to perform something like this
string strCondition = "FirstName=='abc'"
from p in People.Where(strCondition) select p
In our architecture we are usign both Linq-Sql as well Linq-Entity. So please give some thoughts wehter it is possible or not and is there any way to perform this?
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Mar 19, 2011
I am facing a big problem with simple linq query.. I am using EF 4.0..
I am trying to take all the records from a table using a linq query:
var result = context.tablename.select(x=>x);
This results in less rows than the normal sql query which is select * from tablename;
This table has more than 5 tables as child objects (foreign key relations: one to one and one to many etc)..
This result variable after executing that linq statement returns records with all child object values without doing a include statement.. I don't know is it a default behavior of EF 4.0 . I tried this statement in linqpad also..but there is no use... But interesting thing is if I do a join on the same table with another one table is working same is sql inner join and count is same..but I don't know why is it acting differently with that table only.. Is it doing inner joins with all child tables before returning the all records of that parent table?
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Oct 17, 2010
I am writing a linq query to select a blogpost,
[code]....
The blogpost i am testing got 3 tags attached to it. The table structure is:
(table)BlogPost -> (table)BlogPostTags <- (table)Tags
So the BlogPostTags table only contains 2 fields, BlogPostID and TagID.
When i run the query above i get 3 results back. Same blogpost 3 times but with 1 tag in each. It should return 1 post with 3 tags. The problem lies in the Tags query above.
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Aug 2, 2010
when I click 'create new site' link/button it will redirect me to some page and ask me some questions related to that site which I am about to create .. At the moment it display me question and for input their respective control like to choosing category it display me drop down list ... for business name textbox is displayed. and so on ...
So my question is how can I do the same task ? that is what ever the question is their respective control is displayed for getting information ..
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Apr 27, 2016
public string ACtivationKey()
{
string allowedChars = "";
allowedChars = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,";
allowedChars += "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,";
allowedChars += "1,2,3,4,5,6,7,8,9,0";
[Code] ....
I am generating a new order reference id in a class Called GeneratePdf.cs
I use it as Â
GeneratePdf gp = new GeneratePdf();
string orderunique = "ORD-" + gp.ACtivationKey();
var uniqness = db.OrdersMasters.Where(x => x.OrderRefNumber == orderunique).Select(x => x.OrderRefNumber).Count();
I want to run a check if the reference number is not present in database. if its present generate new ...
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Jun 11, 2010
I would like to generate a dynamic sitemap to my website.It should be updated daily. Depends up on database user i have to generate.I am in initial stage of my website development.What are the things i have to take care. And how to develop a sitemap according to my requirement. I am using TeamSys 2008
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Sep 14, 2010
I want to add a Dynamic column in Crystal report at run time. Because I dont know about the columns in design time. The columns will come based on the user selection.
So i want to Add a column to Crustal report at run time. I am using Crystal report. If it is not support to add column in Crystal report at runtime.
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Jan 22, 2011
I have a web app for our golf club. When I compute handicap index for each golfer, I have to select the most recent scores and then a subset of those scores depending on how many rounds of golf the golfer has played. All the scores are entered into a single SQL Express table called "Rounds". Verbally, this is what I'm trying to do:
1) select the twenty most recent golf scores (sort on date descending, "take(20)") [if less than 20 records, then select all available];
2) for this set of records, select the 10 lowest scores (or smaller number if golfer has less than 20 rounds);
3) compute the average round differential for the subset of records, etc. to calculate handicap index (this step is working ok...)
My current VB code has this LINQ query (which is flawed -- it selects the lowest handicap differential scores of ALL records for the filtered user):
[Code]....
How do I modify this query to accomplish items 1) & 2) above? It seems this should be simple, but my experience with queries is still limited.
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Jul 1, 2010
I have 2 drop downs that control the generation of dynamic controls.
Problem is that when the async post back happens the results are giving the previous values selected in the drop downs and not the new selected value in the drop down as would be expected from a traditional postback event.
So the calls to generate the dynamic controls are always 1 step behind.
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Feb 21, 2011
i am making a report.rdlc which depend on the statment
[Code]....
which doesn't have a specific column name
how can i fill the table in the report
column value in table =Fields!columnname.Value (how can i get columnname, it is dynamic)
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