2024 C# list to datareader

C# list to datareader

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August undefined, 2024

Web我是MVC的新手並嘗試編寫一個簡單的MVC 應用程序，該應用程序在模型中的類中讀取客戶數據並使用控制器將其返回到視圖。 Reader顯示它有行但是當加載到表並傳遞給視圖作為模型時，它為null。我需要一個簡單的解決方案來傳遞DataTable來查看或DataReader來查看我可以轉換為DataT Web到目前為止，我正在使用DataTable綁定Repeater 。但是對於新項目，我想提高其性能，因此我想知道哪種更好地綁定Repeater ， DataReader或DataTable ？. 我將使用帶 …

SqlDataReader Class (System.Data.SqlClient) Microsoft …

WebSep 28, 2015 · 6. SqlDataReader is the fastest way. Make sure you use the get by ordinal methods rather than get by column name. e.g. GetString (1); Also worthwhile is experimenting with MinPoolSize in the connection string so that there are always some connections in the pool. WebJul 27, 2015 · You're missing basic C# syntax. Data = reader; // You cant do this. You have to loop the reader to get the values from it. // If you simply assign reader object itself as the data you wont be // able to get data once the reader or connection is closed. // The reader is typically closed in the method. ostrom painting \\u0026 sandblasting rock island il

c# - Convert rows from a data reader into typed results - Stack Overflow

WebJan 13, 2016 · public static List getObject () { List list = new List (); var datareader = Database.getData (); while (datareader.Read ()) { list.Add (item: new Object.Class ( id: datareader.GetInt32 (0), date: DateTime.Parse (datareader.GetString (6)) ) ); } datareader.Close (); return list; } Share WebC#中DataTable和List互转的示例代码：& DataTableDataTable 是 C# 中常用的一种数据表格类型，它类似于数据库中的表格，可以用来存储和处理数据。DataTable 中的数据可以 … WebYou can use the SqlDataReader class and the StreamWriter class in C# to write the contents of a SQL query to a CSV file with column names. Here's an example code snippet that demonstrates this approach: ... (query, connection)) using (SqlDataReader reader = command.ExecuteReader()) using (StreamWriter writer = new StreamWriter("output.csv ... rock bottom brewing company

DataReader to .CSV with column names in C# - iditect.com

C# list to datareader

Best method to use IDataReader as IEnumerable ?

WebOct 10, 2014 · C# private Func GetReader (SqlDataReader reader) Step 1 - Get Column List The first step in our function is to get the list of columns that are in our SqlDataReader input parameter. We may have properties of the class that are not data elements in the query. Web到目前為止，我正在使用DataTable綁定Repeater 。但是對於新項目，我想提高其性能，因此我想知道哪種更好地綁定Repeater ， DataReader或DataTable ？. 我將使用帶有Repeater的Custom Paging ，一次獲取約20行。我應該在List中填充數據還是直接將DataReader或DataTabl e用作DataSource ？. 請幫助我選擇任何一個以獲得更好 ...

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WebJul 28, 2014 · using (var reader = cmd.ExecuteReader ()) { var mapper = new DataReaderMapper (reader); while (reader.Read ()) yield return mapper.MapFrom (reader); } I believe this code is overall shorter, but personally I think you should go for expressions instead of reflection, or even better try a tried and tested ORM. WebJun 22, 2014 · This only return one object not list of objects. I think list.AddRange(student) is correct but student should be converted ToList().

WebSep 15, 2024 · You can use the ADO.NET DataReader to retrieve a read-only, forward-only stream of data from a database. Results are returned as the query executes, and are stored in the network buffer on the client until you request them using the Read method of the DataReader. Using the DataReader can increase application performance both by …

Webpublic static SqlDataReader GetGeneralInformation ( int RecID ) { using ( var conn = new SqlConnection ( GetConnectionString () ) ) using ( var cmd = conn.CreateCommand () ) { conn.Open (); cmd.CommandText = @"SELECT cs.Status, cs.Completed FROM NC_Steps s INNER JOIN NC_ClientSteps cs ON cs.RecID = s.RecID WHERE cs.ClientID = 162 … http://andreyzavadskiy.com/2024/07/03/converting-list-to-idatareader/

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WebJul 8, 2010 · public ConvertToList (SqlDataReader sqldr, int index) { List list = new List (); while (sqldr.Read ()) { list.Add ( (T)sqldr.GetValue (index)); index++; } return list; } Old discussion, but try this on for size. Strongly type your fields, and cast your rows into a DbDataRecord object. ex: ostrom mushroom sunnysideWebNov 8, 2014 · The following is the code for converting the DataReader to a List. using System; using System.Collections.ObjectModel; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Windows; namespace DataReaderToList.ViewModels { class DataReaderToListModel { #region Varible … rock bottom brewery westminster coloWebIf it is another type, you need to convert it using System.Convert. SqlDataReader rdr = cmd.ExecuteReader (); while (rdr.Read ()) { string column = rdr ["ColumnName"].ToString (); int columnValue = Convert.ToInt32 (rdr ["ColumnName"]); } Share Improve this answer Follow answered Oct 25, 2010 at 19:32 Martin 11k 8 49 77 Add a comment 25 rock bottom brewery warrenvilleWebTo create a SqlDataReader, you must call the ExecuteReader method of the SqlCommand object, instead of directly using a constructor. While the SqlDataReader is being used, the associated SqlConnection is busy serving the SqlDataReader, and no other operations can be performed on the SqlConnection other than closing it. rock bottom brewery warrenville ilWebMay 1, 2009 · Use System.CodeDom to generate a C# class containing code to set the properties according to the respective fields on the IDataReader. Note that System.CodeDom invokes the csc.exe compiler in the background, so you need to generate this code once at startup and re-use it on each call. ostrom seattle benWebGreg Smalter. 6,541 9 42 63. Without writing your implementation, IDataReader and/or DbDataReader and "GetStrongScalarType ( ordinalNumber ) is the faster. GetString, GetInt32, etc. and 0, 1, 2 or ordinal. At the end of the data, filling a DataTable or a DataSet or most ORM's are using IDataReader and/or DbDataReader, and using ordinal number. ostrom painting \u0026 sandblasting rock island ilWebJan 27, 2009 · A DataReader is typically used to read data from the database and add logic to fill a list of objects or a DataTable. So it's best to do most business logic which has to do with the building of the DataTable on the webservice, pass it to the client as a webservice and work with the other ADO.Net functions there for more business logic. rock bottom brewery san jose ca