DataTableExtensions.CopyToDataTable<T> Method (IEnumerable<T>)


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Returns a DataTable that contains copies of the DataRow objects, given an input IEnumerable<T> object where the generic parameter T is DataRow.

Namespace:   System.Data
Assembly:  System.Data.DataSetExtensions (in System.Data.DataSetExtensions.dll)

public static DataTable CopyToDataTable<T>(
	this IEnumerable<T> source
where T : DataRow


Type: System.Collections.Generic.IEnumerable<T>

The source IEnumerable<T> sequence.

Return Value

Type: System.Data.DataTable

A DataTable that contains the input sequence as the type of DataRow objects.

Type Parameters


The type of objects in the source sequence, typically DataRow.

Exception Condition

The source IEnumerable<T> sequence is null and a new table cannot be created.


A DataRow in the source sequence has a state of Deleted.

The source sequence does not contain any DataRow objects.

A DataRow in the source sequence is null.

The parameter T of the input parameter source can only be of type DataRow or a type derived from DataRow.

The input sequence can be any IEnumerable<T> source, not only a query or a query over a DataTable. Note that if the source sequence is a query, calling this operator will force immediate execution. Enumerating the source sequence can also cause exceptions to be thrown.

The schema of the destination table is based on the schema of the first DataRow row in the source sequence. The table metadata is extracted from the DataRow metadata and the table values from the column values of the DataRow. For a typed DataTable, types are not preserved. The data and schema are transferred, but the resulting rows of the output table will not be of the typed DataRow type. The RowState and RowError properties are not preserved during the copy from the source DataRow to the returned DataTable.

When a null reference or nullable type with a value of null is found in a source DataRow, this method replaces the value in the destination DataTable with a value of Value.

The generated table returned by the method has the default table name. If you want to name the DataTable, attach it to a DataSet, or perform any other DataTable specific operation, you must do so after the table is created and returned.

For more information, see Creating a DataTable From a Query (LINQ to DataSet).

The following example queries the SalesOrderHeader table for orders after August 8, 2001, and uses the CopyToDataTable method to create a DataTable from that query. The DataTable is then bound to a BindingSource, which acts as proxy for a DataGridView.

// Bind the System.Windows.Forms.DataGridView object
// to the System.Windows.Forms.BindingSource object.
dataGridView.DataSource = bindingSource;

// Fill the DataSet.
DataSet ds = new DataSet();
ds.Locale = CultureInfo.InvariantCulture;

DataTable orders = ds.Tables["SalesOrderHeader"];

// Query the SalesOrderHeader table for orders placed 
// after August 8, 2001.
IEnumerable<DataRow> query =
    from order in orders.AsEnumerable()
    where order.Field<DateTime>("OrderDate") > new DateTime(2001, 8, 1)
    select order;

// Create a table from the query.
DataTable boundTable = query.CopyToDataTable<DataRow>();

// Bind the table to a System.Windows.Forms.BindingSource object, 
// which acts as a proxy for a System.Windows.Forms.DataGridView object.
bindingSource.DataSource = boundTable;

.NET Framework
Available since 3.5
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