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ForeignKeyConstraint.Equals Method

Gets a value indicating whether the current ForeignKeyConstraint is identical to the specified object.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)
public override bool Equals(
	Object key
)

Parameters

key
Type: System.Object

The object to which this ForeignKeyConstraint is compared. Two ForeignKeyConstraint are equal if they constrain the same columns.

Return Value

Type: System.Boolean
true, if the objects are identical; otherwise, false.

The following example creates a new ForeignKeyConstraint and checks it against other collection members with the Equals method before adding it to a ConstraintCollection.

private void CreateConstraint(DataSet dataSet)
{
   // Create the ForignKeyConstraint with two DataColumn objects.
   DataColumn parentCol = dataSet.Tables["Customers"].Columns["id"];
   DataColumn childCol = dataSet.Tables["Orders"].Columns["OrderID"];
   ForeignKeyConstraint fkeyConstraint =
      new ForeignKeyConstraint("fkConstraint", parentCol, childCol);

   // Test against existing members using the Equals method. 
   foreach(ForeignKeyConstraint testConstraint in 
       dataSet.Tables["Orders"].Constraints)
   {
      if(fkeyConstraint.Equals(testConstraint)){
         Console.WriteLine("Identical ForeignKeyConstraint!");
          // Insert code to delete the duplicate object,  
          // or stop the procedure.
      }
   }
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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