c#datatable在位置0插入列
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c# datatable insert column at position 0
提问by Grant
does anyone know the best way to insert a column in a datatable at position 0?
有谁知道在位置 0 的数据表中插入一列的最佳方法吗？
采纳答案by Wael Dalloul
You can use the following code to add column to Datatable at postion 0:
您可以使用以下代码将列添加到位置 0 的数据表：
DataColumn Col = datatable.Columns.Add("Column Name", System.Type.GetType("System.Boolean"));
Col.SetOrdinal(0);// to put the column in position 0;
回答by CigarDoug
Just to improve Wael's answer and put it on a single line:
只是为了改进 Wael 的答案并将其放在一行中：
dt.Columns.Add("Better", typeof(Boolean)).SetOrdinal(0);
UPDATE: Note that this works when you don't need to do anything else with the DataColumn. Add() returns the column in question, SetOrdinal() returns nothing.
更新：请注意，当您不需要对 DataColumn 执行任何其他操作时，这会起作用。Add() 返回有问题的列， SetOrdinal() 不返回任何内容。
回答by Farhad
//Example to define how to do :
DataTable dt = new DataTable();
dt.Columns.Add("ID");
dt.Columns.Add("FirstName");
dt.Columns.Add("LastName");
dt.Columns.Add("Address");
dt.Columns.Add("City");
// The table structure is:
//ID FirstName LastName Address City
//Now we want to add a PhoneNo column after the LastName column. For this we use the
//SetOrdinal function, as iin:
dt.Columns.Add("PhoneNo").SetOrdinal(3);
//3 is the position number and positions start from 0.`enter code here`
//Now the table structure will be:
// ID FirstName LastName LastName PhoneNo Address City
