Orderby的扩展方法

CSharp3.0中扩展方法，直接看代码：

/// <summary>
/// Orders the by.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="list">The list.</param>
/// <param name="sortExpression">The sort expression.</param>
/// <returns>IEnumerable<T></returns>
public static IEnumerable<T> OrderBy<T>(this IEnumerable<T> list, string sortExpression)
{
    sortExpression += "";
    string[] parts = sortExpression.Split(' ');
    bool descending = false;
    string property = "";

    if (parts.Length > 0 && parts[0] != "")
    {
        property = parts[0];

        if (parts.Length > 1)
        {
            descending = parts[1].ToLower().Contains("esc");
        }

        PropertyInfo prop = typeof(T).GetProperty(property);

        if (prop == null)
        {
            throw new Exception("No property '" + property + "' in + " + typeof(T).Name + "'");
        }

        if (descending)
            return list.OrderByDescending(x => prop.GetValue(x, null));
        else
            return list.OrderBy(x => prop.GetValue(x, null));
    }

    return list;
}

如何用呢？很简单：

public void Test()
{
    var list = new List<Customer>();
    list.OrderBy("Name desc"); 
}

public class Customer
{
    public string Name { get; set; }
}

是不是很实用呀，这个来自一个名叫http://www.extensionmethod.net/　网站．希望对您有帮助．

Author:Petter  http://wintersun.cnblogs.com