DataRowCollection::Contains Method (Object^)
Gets a value that indicates whether the primary key of any row in the collection contains the specified value.
Assembly: System.Data (in System.Data.dll)
Parameters
- key
-
Type:
System::Object^
The value of the primary key to test for.
Return Value
Type: System::Booleantrue if the collection contains a DataRow with the specified primary key value; otherwise, false.
| Exception | Condition |
|---|---|
| MissingPrimaryKeyException | The table does not have a primary key. |
To use the Contains method, the DataTable object to which the DataRowCollection object belongs to must have at least one column designated as a primary key column. See the PrimaryKey property for more information about how to create a primary key column.
As soon as you have determined that a row contains the specified value, you can use the Find method to return the specific DataRow object that has the value.
The following Visual Basic example uses the Contains method to determine whether a DataRowCollection object contains a specific value.
Private Sub ColContains() Dim table As DataTable = CType(DataGrid1.DataSource, DataTable) Dim rowCollection As DataRowCollection = table.Rows If rowCollection.Contains(Edit1.Text) Then Label1.Text = "At least one row contains " & Edit1.Text Else Label1.Text = "No row contains the value in its primary key field" End If End Sub
Available since 1.1