DataSet.EnforceConstraints Property

public:
 property bool EnforceConstraints { bool get(); void set(bool value); };

public bool EnforceConstraints { get; set; }

[System.Data.DataSysDescription("DataSetEnforceConstraintsDescr")]
public bool EnforceConstraints { get; set; }

member this.EnforceConstraints : bool with get, set

[<System.Data.DataSysDescription("DataSetEnforceConstraintsDescr")>]
member this.EnforceConstraints : bool with get, set

Public Property EnforceConstraints As Boolean

Property Value

true if rules are enforced; otherwise, false. The default is true.

Attributes

DataSysDescriptionAttribute

Exceptions

Examples

The following example creates a DataSet with one table, one column, five rows, and one UniqueConstraint. The EnforceConstraints property is set to false and the values of each row are set to the same value. When the EnforceConstraints property is reset to true, a ConstraintException is generated.

private void DemonstrateEnforceConstraints()
{
 // Create a DataSet with one table, one column and
 // a UniqueConstraint.
 DataSet dataSet= new DataSet("dataSet");
 DataTable table = new DataTable("table");
 DataColumn column = new DataColumn("col1");

 // A UniqueConstraint is added when the Unique
 // property is true.
 column.Unique=true;
 table.Columns.Add(column);
 dataSet.Tables.Add(table);
 Console.WriteLine("constraints.count: " +
 table.Constraints.Count);

 // add five rows.
 DataRow row ;
 for(int i=0;i<5;i++)
 {
 row = table.NewRow();
 row["col1"] = i;
 table.Rows.Add(row);
 }
 table.AcceptChanges();

 dataSet.EnforceConstraints=false;
 // Change the values of all rows to 1.
 foreach(DataRow thisRow in table.Rows)
 {
 thisRow["col1"]=1;
 //Console.WriteLine("\table" + thisRow[0]);
 }
 try
 {
 dataSet.EnforceConstraints=true;
 }
 catch(System.Data.ConstraintException e)
 {
 // Process exception and return.
 Console.WriteLine("Exception of type {0} occurred.",
 e.GetType());
 }
}

Private Sub DemonstrateEnforceConstraints()
 ' Create a DataSet with one table, one column and 
 ' a UniqueConstraint.
 Dim dataSet As New DataSet("dataSet")
 Dim table As New DataTable("table")
 Dim column As New DataColumn("col1")
 column.Unique = True
 table.Columns.Add(column)
 dataSet.Tables.Add(table)
 Console.WriteLine("constraints.count: " _
 & table.Constraints.Count)

 ' add five rows.
 Dim row As DataRow
 Dim i As Integer
 For i = 0 To 4
 row = table.NewRow()
 row("col1") = i
 table.Rows.Add(row)
 Next
 table.AcceptChanges()
 
 dataSet.EnforceConstraints = False
 ' Change the values of all rows to 1.
 Dim thisRow As DataRow
 For Each thisRow In table.rows
 thisRow("col1") = 1
 Next
 
 Try
 dataSet.EnforceConstraints = True
 Catch e As System.Data.ConstraintException
 ' Process exception and return.
 Console.WriteLine("Exception of type {0} occurred.", _
 e.GetType().ToString())
 End Try
End Sub

Remarks

Constraints are set at the DataTable level (Constraints property). For more information about creating constraints, see DataTable Constraints.

See also

• Using DataSets in ADO.NET