linq

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How to get the amount of colums from a SQL database with LinqDataSource?

I want to make a foreach loop which runs for each column I have in my current table. My situation is that I have my ASP.Net project where I have one Microsoft SQL Model which I imported and created a[详细]

2023-04-13 05:34 分类：问答
System.Linq.Dynamic ´s .Where will be misinterpreted

I\'ve build a large program with many references. F.e.: System.Data.DataSetExtensions System.Linq.Dynamic[详细]

2023-04-13 05:14 分类：问答
LINQ query where boolean value is true or false

How can I compare a boolean value to both true and false in a LINQ query? If hideCompleted is true, I want to show values where IsC开发者_如何学Goompleted is false[详细]

2023-04-13 04:47 分类：问答
Flattening a loop with lookups into a single linq expression

In Type member support in LINQ-to-Entities? I was attempting to declare a class property to be queried in LINQ which ran into some issues.Here I will lay out the code inside the implementation in hope[详细]

2023-04-13 04:42 分类：问答
Create a generic method where a expression can be passed as parameter to make dynamic queries

I am using EF. and the repository Pattern. The specific question is how can I write the GetPositionByCustomExpression below so that from the caller I can pass an expression, sometimes the expression[详细]

2023-04-13 04:31 分类：问答
Find hole in sequence using Linq to Sql

I am using Linq to Sql against a SQL Server Compact database. I need a fast way to find the first hole in an integer based column or if none exist the highest number + 1.[详细]

2023-04-13 03:45 分类：问答
Will the condition on a LINQ Where-statement re-evaluate during the loop?

I have this foreach-loop: foreach (var classId in m_ClassMappings[taAddressDefinition.Key]) { if(!m_TAAddressDefinitions.ContainsKey(classId))[详细]

2023-04-13 03:44 分类：问答
LINQ to Entity : Multiple join conditions

There are numerous post regarding LINQ and multiple joins. I have however not found any solution to the join I\'d like to make.[详细]

2023-04-13 03:43 分类：问答
Error: ASP.NET: 'DataContext accessed after Dispose.'

There are two tables: Account (id) and BranchId(Id,Name,AccountId) and I have this code in pageload protected void Page_Load(object sender, EventArgs e)[详细]

2023-04-13 02:54 分类：问答
Why doesn't a separately instantiated Func<T,bool> predicate not translate into SQL with Entity Framework?

I have an EF Code First Db context that I\'m using to query the database. I noticed some performance issues when passing in queries as Func<Product, bool>s from my Aggregate Repository and on in[详细]

2023-04-13 02:53 分类：问答