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BindingList<T>.FindCore Method

Searches for the index of the item that has the specified property descriptor with the specified value, if searching is implemented in a derived class; otherwise, a NotSupportedException.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

protected virtual int FindCore(
	PropertyDescriptor prop,
	Object key
)

Parameters

prop
Type: System.ComponentModel.PropertyDescriptor

The PropertyDescriptor to search for.

key
Type: System.Object

The value of property to match.

Return Value

Type: System.Int32
The zero-based index of the item that matches the property descriptor and contains the specified value.

ExceptionCondition
NotSupportedException

FindCore is not overridden in a derived class.

The BindingList<T> class does not provide a base implementation of searching, and so FindCore always throws a NotSupportedException by default. To enable searching, derive from BindingList<T> and perform the following tasks:

The following code example demonstrates how to use the FindCore member.

    public class MyFontList : BindingList<Font>
    {

        protected override bool SupportsSearchingCore
        {
            get { return true; }
        }
        protected override int FindCore(PropertyDescriptor prop, object key)
        {
            // Ignore the prop value and search by family name. 
            for (int i = 0; i < Count; ++i)
            {
                if (Items[i].FontFamily.Name.ToLower() == ((string)key).ToLower())
                    return i;

            }
            return -1;
        }


    }

}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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