其实重点在于实现 IComparer 接口,实现按照自已的来排序
class Entity
{
public Entity()
{}
private int id;
public int Id
{
get
{
return id;
}
set
{
id = value;
}
}
private string name;
public string Name
{
get
{
return name;
}
set
{
name = value;
}
}
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private double price;
public double Price
{
get
{
return price;
}
set
{
price = value;
}
}
}
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internal class ListComparer<TBaseBusinessObject> : IComparer<TBaseBusinessObject>
{
private string propertyName;
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public ListComparer(string PropertyName)
{
propertyName = PropertyName;
}
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#region IComparer<TBaseBusinessObject> Members
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public int Compare(TBaseBusinessObject x, TBaseBusinessObject y)
{
PropertyInfo property = typeof(TBaseBusinessObject).GetProperty(propertyName);
if (property.PropertyType == Type.GetType("System.Int16"))
{
int xNumber = 0;
int yNumber = 0;
if (property.GetValue(x, null) != null)
{
xNumber = Convert.ToInt16(property.GetValue(x, null).ToString());
}
if (property.GetValue(y, null) != null)
{
yNumber = Convert.ToInt16(property.GetValue(y, null).ToString());
}
return xNumber.CompareTo(yNumber);
}
if (property.PropertyType == Type.GetType("System.Int32"))
{
int xNumber = 0;
int yNumber = 0;
if (property.GetValue(x, null) != null)
{
xNumber = Convert.ToInt32(property.GetValue(x, null).ToString());
}
if (property.GetValue(y, null) != null)
{
yNumber = Convert.ToInt32(property.GetValue(y, null).ToString());
}
return xNumber.CompareTo(yNumber);
}
if (property.PropertyType == Type.GetType("System.Double"))
{
double xNumber = 0;
double yNumber = 0;
if (property.GetValue(x, null) != null)
{
xNumber = Convert.ToDouble(property.GetValue(x, null).ToString());
}
if (property.GetValue(y, null) != null)
{
yNumber = Convert.ToDouble(property.GetValue(y, null).ToString());
}
return xNumber.CompareTo(yNumber);
}
if (property.PropertyType == Type.GetType("System.DateTime"))
{
DateTime xTime = DateTime.Now;
DateTime yTime = DateTime.Now;
if (property.GetValue(x, null) != null)
{
xTime = Convert.ToDateTime(property.GetValue(x, null).ToString());
}
if (property.GetValue(y, null) != null)
{
yTime = Convert.ToDateTime(property.GetValue(y, null).ToString());
}
return xTime.CompareTo(yTime);
}
if ((property.PropertyType == Type.GetType("System.String")) || (property.PropertyType == Type.GetType("System.Boolean")))
{
string xText = string.Empty;
string yText = string.Empty;
if (property.GetValue(x, null) != null)
{
xText = property.GetValue(x, null).ToString();
}
if (property.GetValue(y, null) != null)
{
yText = property.GetValue(y, null).ToString();
}
return xText.CompareTo(yText);
}
return 0;
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}
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#endregion
}
public class BaseBusinessObjectList<TBaseBusinessObject> : List<TBaseBusinessObject>
{
public void Sort(string sortfield, bool isAscending)
{
//这里实例化了刚才写的IComparer类。
ListComparer<TBaseBusinessObject> listComparer = new ListComparer<TBaseBusinessObject>(sortfield);
base.Sort(listComparer);
if (!isAscending) base.Reverse();
}
}
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BaseBusinessObjectList<Entity> list = new BaseBusinessObjectList<Entity>();
Entity obj = new Entity();
obj.Id = 1;
obj.Name = "test";
obj.Price = 3.23;
list.Add(obj);
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//按照Name字段向上排序。
list.Sort("Name",true);
//按照Price字段向上排序。
list.Sort("Price",true);
//按照Id字段向下排序。
list.Sort("Id",false);
class Entity
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然后写一个对象比较的类,实现IComparer<T>接口。
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然后是写了一个List继承List<T>类的集合,
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于是就写完了,用的时候
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完了~~~