WebThis method is efficient because it only iterates over the DataTable once, using a DataTableReader to read the rows and columns. The StringBuilder is used to efficiently build the CSV string, without creating unnecessary intermediate string objects. More C# Questions. ToList()-- does it create a new list in C#? WebMar 26, 2014 · Simply create a DataTable from your list of objects and call SqlBulkCopy.WriteToServer, passing the data table. You might find the following useful: Adding columns to a DataTable. Add a column for each property/field you wish to write. Adding rows to a DataTable. Add a row for each object in your list.
Creating a DataTable From a Query (LINQ to DataSet)
WebI'm getting values from another data table as input to list. Now i need to save those list values into another DataTable. List: List list = slectedFieldsTable.AsEnumerable().ToList(); foreach (DataRow dr in … WebApr 8, 2024 · 最近公司有个项目需要用c#来显示数据库的内容,作为一个只会c\c++的程序员,起初我心里还是有些没底的。然后就上网搜集了一些关于DataGridView控件的资料,为免遗忘,特此记录。1 什么是DataGridViewDataGridView控件具有很高的的可配置性和可扩展性,提供了大量的属性、方法和事件,可以用来对该控件 ... chimney sweeps evanston wy
c# - LINQ to map a datatable into a list - Stack Overflow
WebFeb 14, 2024 · As to me ListToDataTable class have to be static and its method ToDataTable too. On the other hand, your data is stored in List, which means you can simply rewrite it into DataTable: DataTable dt = new DataTable (); dt.Columns.Add (new DataColumn ("Record", typeof (string))); foreach (string item in records) { WebFeb 14, 2024 · Maciej Los 14-Feb-18 2:14am. As to me ListToDataTable class have to be static and its method ToDataTable too. On the other hand, your data is stored in … WebSep 3, 2013 · I am using ExcelDataReader to import an Excel file to a dataset.. Example Excel table: //ID Name Display Order Active //1 John 1 1 ID, DisplayOrder and Active columns are read as double, so I have to convert them to long, int and bool types respectively. I need to create a list of type Category from the DataTable of the DataSet. grady county dhr