public class CommonService { private readonly DataContext _context; public CommonRepository() { _context = new DataContext(); } public CommonRepository(DataContext context) { _context = context; } public List GetAll() { var query = from m in _context.MyModel select m; return m.ToList(); } } or p
public class CommonService { private readonly DataContext _context; public CommonRepository() { _context = new DataContext(); } public CommonRepository(DataContext context) { _context = context; } public List GetAll() { var query = from m in _context.MyModel select m; return m.ToList(); } } 要么
I'll say up front that I am doing some really scary things with linq on dynamic data. But I can't figure out why this query fails to compile: Error 1 The property '<>h__TransparentIdentifier0' cannot be used with type arguments public class Program { public static void Main(string[] args) { var docs = new dynamic[0]; var q = from doc in docs
我会先说,我正在用动态数据进行一些非常可怕的事情。 但我不明白为什么这个查询无法编译: 错误1属性'<> h__TransparentIdentifier0'不能与类型参数一起使用 public class Program { public static void Main(string[] args) { var docs = new dynamic[0]; var q = from doc in docs where doc["@metadata"]["Raven-Entity-Name"] == "Cases" where
I have a simple lookup list that I will use to populate a dropdown in Silverlight. In this example I'm using US States. I'm trying to figure out if its better to return a static list or use the yield keyword. Of the following two pieces of code, which is the preferred and why? Version 1: Using yield return public class States { public static IEnumerable<string> GetNames()
我有一个简单的查找列表,我将用它来填充Silverlight中的下拉列表。 在这个例子中,我使用美国国家。 我试图找出它是否更好地返回静态列表或使用yield关键字。 以下两段代码中,哪些是首选的,为什么? 版本1:使用收益率回报 public class States { public static IEnumerable<string> GetNames() { yield return "Alabama"; yield return "Alaska"; yield return "Arizona";
I have the following function to get validation errors for a card. My question relates to dealing with GetErrors. Both methods have the same return type IEnumerable<ErrorInfo> . private static IEnumerable<ErrorInfo> GetErrors(Card card) { var errors = GetMoreErrors(card); foreach (var e in errors) yield return e; // further yield returns for more validation err
我有以下功能来获取卡的验证错误。 我的问题涉及处理GetErrors。 两种方法都有相同的返回类型IEnumerable<ErrorInfo> 。 private static IEnumerable<ErrorInfo> GetErrors(Card card) { var errors = GetMoreErrors(card); foreach (var e in errors) yield return e; // further yield returns for more validation errors } 是否有可能返回GetMoreErrors所有错误,而不必通过它们枚举?
I am trying to convert a DataTable to an IEnumerable. Where T is a custom type I created. I know I can do it by creating a List but I was think there was a slicker way to do it using IEnumerable. Here is what I have now. private IEnumerable<TankReading> ConvertToTankReadings(DataTable dataTable) { var tankReadings = new List<TankReading>(); foreach (DataRow
我正试图将DataTable转换为IEnumerable。 其中T是我创建的自定义类型。 我知道我可以通过创建一个List来做到这一点,但我认为有一种使用IEnumerable的方法。 这是我现在拥有的。 private IEnumerable<TankReading> ConvertToTankReadings(DataTable dataTable) { var tankReadings = new List<TankReading>(); foreach (DataRow row in dataTable.Rows) { var tankR
Here is my sample code that I am using to fetch data from database: on DAO layer: public IEnumerable<IDataRecord> GetDATA(ICommonSearchCriteriaDto commonSearchCriteriaDto) { using(DbContext) { DbDataReader reader = DbContext.GetReader("ABC_PACKAGE.GET_DATA", oracleParams.ToArray(), CommandType.StoredProcedure); while (reader.Read()) { yield retur
以下是我用于从数据库获取数据的示例代码:在DAO层上: public IEnumerable<IDataRecord> GetDATA(ICommonSearchCriteriaDto commonSearchCriteriaDto) { using(DbContext) { DbDataReader reader = DbContext.GetReader("ABC_PACKAGE.GET_DATA", oracleParams.ToArray(), CommandType.StoredProcedure); while (reader.Read()) { yield return reader; } } }
I'm having problem in getting correct data from two datatables into one by using Linq in C#. My datatables' data are coming from Excel file reading (not from DB). I have tried below linq but return rows count is not what I want (my goal is to retrieve all data but for verification, I'm checking on row count so that I can know is it correct or not easily). In dt1, I have 2645 rec
我在通过在C#中使用Linq将两个数据表中的正确数据合并为一个数据库时遇到了问题。 我的数据表的数据来自Excel文件读取(而不是数据库)。 我已经尝试了下面的LINQ,但返回行数并不是我想要的(我的目标是检索所有数据,但为了验证,我正在检查行数,以便我可以知道它是正确的还是不容易)。 在dt1中,我有2645条记录。 在dt2中,我有2600条记录。 返回行数是2600(看起来它正在做正确的连接逻辑)。 var v1 = from d1
I have a question about LINQ There are two DataTables I wanna to inner join, the code as follows: DataTable dt1 = new DataTable(); DataTable dt2 = new DataTable(); dt1.Columns.Add("TEST1"); dt1.Columns.Add("TEST2"); dt1.Columns.Add("TEST3"); dt1.Columns.Add("TEST4"); dt2.Columns.Add("TEST2"); dt2.Columns.Add("TEST5"); dt2.Columns.Add("TEST6"); dt2.Column
我有一个关于LINQ的问题有两个我想要内连接的DataTables,代码如下: DataTable dt1 = new DataTable(); DataTable dt2 = new DataTable(); dt1.Columns.Add("TEST1"); dt1.Columns.Add("TEST2"); dt1.Columns.Add("TEST3"); dt1.Columns.Add("TEST4"); dt2.Columns.Add("TEST2"); dt2.Columns.Add("TEST5"); dt2.Columns.Add("TEST6"); dt2.Columns.Add("TEST7"); for (int i =
I have 2 data tables, which I do not know their list of data columns. This list must be extracted at run time, and be used for the full outer join. When using these columns, the columns between the 2 tables need to be merged, and I need all data to be displayed. Till now what I am doing is Get common columns, using intersect, and implementing IEqualityComparer Create a new datatable, wit
我有2个数据表,我不知道他们的数据列的列表。 该列表必须在运行时提取,并用于完整外连接。 使用这些列时,需要合并两个表格之间的列,并且需要显示所有数据。 直到现在我正在做的是 获取公共列,使用相交,并实现IEqualityComparer 用这些列创建一个新的数据表,以便这两个数据表将被合并到这个新表中 但是,我在第二步中遇到了Linq问题。 直到现在我有: 获取常用列 // Get common columns var comm
Here is a simplified select list <select name="stuff"> <option value="">All</option> <option>Test</option> <option>Test1</option> <option>Test2</option> <option>Horses</option> </select> Based on the value from the select list, I wish to find related values from my table. LINQ 1. someTable.Where(r =&g
这是一个简化的选择列表 <select name="stuff"> <option value="">All</option> <option>Test</option> <option>Test1</option> <option>Test2</option> <option>Horses</option> </select> 根据选择列表中的值,我希望从我的表中找到相关的值。 LINQ 1. someTable.Where(r => r.someField.Contains(stuff)); 2. someTable