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37 lines
1.8 KiB
37 lines
1.8 KiB
using System;
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using System.Collections.Generic;
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using System.Text;
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namespace Rssdp
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{
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/// <summary>
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/// Extensions for <see cref="SsdpDevice"/> and derived types.
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/// </summary>
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public static class SsdpDeviceExtensions
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{
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/// <summary>
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/// Returns the root device associated with a device instance derived from <see cref="SsdpDevice"/>.
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/// </summary>
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/// <param name="device">The device instance to find the <see cref="SsdpRootDevice"/> for.</param>
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/// <remarks>
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/// <para>The <paramref name="device"/> must be or inherit from <see cref="SsdpRootDevice"/> or <see cref="SsdpEmbeddedDevice"/>, otherwise an <see cref="System.InvalidCastException"/> will occur.</para>
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/// <para>May return null if the <paramref name="device"/> instance is an embedded device not yet associated with a <see cref="SsdpRootDevice"/> instance yet.</para>
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/// <para>If <paramref name="device"/> is an instance of <see cref="SsdpRootDevice"/> (or derives from it), returns the same instance cast to <see cref="SsdpRootDevice"/>.</para>
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/// </remarks>
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/// <returns>The <see cref="SsdpRootDevice"/> instance associated with the device instance specified, or null otherwise.</returns>
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/// <exception cref="System.ArgumentNullException">Thrown if <paramref name="device"/> is null.</exception>
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/// <exception cref="System.InvalidCastException">Thrown if <paramref name="device"/> is not an instance of or dervied from either <see cref="SsdpRootDevice"/> or <see cref="SsdpEmbeddedDevice"/>.</exception>
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public static SsdpRootDevice ToRootDevice(this SsdpDevice device)
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{
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if (device == null) throw new System.ArgumentNullException("device");
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var rootDevice = device as SsdpRootDevice;
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if (rootDevice == null)
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rootDevice = ((SsdpEmbeddedDevice)device).RootDevice;
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return rootDevice;
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}
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}
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}
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