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ConstraintCollection.Contains Method

Indicates whether the Constraint object specified by name exists in the collection.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)
public bool Contains(
	string name
)

Parameters

name
Type: System.String

The ConstraintName of the constraint.

Return Value

Type: System.Boolean
true if the collection contains the specified constraint; otherwise, false.

Use the Contains method to determine whether the specified Constraint exists before trying to remove it from the collection. You can also use the CanRemove method to determine whether a Constraint can be removed.

The following example determines whether the specified Constraint exists in the ConstraintCollection before its deletion.

public static void RemoveConstraint(
    ConstraintCollection constraints, Constraint constraint)
{
    try
    {
        if(constraints.Contains(constraint.ConstraintName)) 
        {
            if(constraints.CanRemove(constraint)) 
            {
                constraints.Remove(constraint.ConstraintName);
            }
        }
    }
    catch(Exception e) 
    {
        // Process exception and return.
        Console.WriteLine("Exception of type {0} occurred.", 
            e.GetType());
    }
}

.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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