[C#]Linq在使用Distinct去除重複資料時如何指定所要依據的成員屬性

	/// <summary>
	/// Gets or sets the name.
	/// </summary>
	/// <value>The name.</value>
	public string Name { get; set; } 
	#endregion


	#region Public Method
	/// <summary>
	/// Returns a <see cref="System.String"/> that represents this instance.
	/// </summary>
	/// <returns>
	/// A <see cref="System.String"/> that represents this instance.
	/// </returns>
	public override string ToString()
	{
		return Name;
	} 
	#endregion</pre>

public bool Equals(Person x, Person y)
{
	return x.Name.Equals(y.Name);
}

public int GetHashCode(Person obj)
{
	return obj.Name.GetHashCode();
}

#endregion

}

	/// <summary>
	/// Creates a new instance of PropertyComparer.
	/// </summary>
	/// <param name="propertyName">The name of the property on type T 
	/// to perform the comparison on.</param>
	public PropertyComparer(string propertyName)
	{
		//store a reference to the property info object for use during the comparison
		_PropertyInfo = typeof(T).GetProperty(propertyName,
	BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.Public);
		if (_PropertyInfo == null)
		{
			throw new ArgumentException(string.Format("{0} is not a property of type {1}.", propertyName, typeof(T)));
		}
	}

	#region IEqualityComparer<T> Members

	public bool Equals(T x, T y)
	{
		//get the current value of the comparison property of x and of y
		object xValue = _PropertyInfo.GetValue(x, null);
		object yValue = _PropertyInfo.GetValue(y, null);

		//if the xValue is null then we consider them equal if and only if yValue is null
		if (xValue == null)
			return yValue == null;

		//use the default comparer for whatever type the comparison property is.
		return xValue.Equals(yValue);
	}

	public int GetHashCode(T obj)
	{
		//get the value of the comparison property out of obj
		object propertyValue = _PropertyInfo.GetValue(obj, null);

		if (propertyValue == null)
			return 0;

		else
			return propertyValue.GetHashCode();
	}

	#endregion
}</pre>

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