一个对象集合排序的类

写了一个对象集合排序的类

废话不多说，首先是定义一个对象实体类

classEntity
{
publicEntity()
{}
privateintid;
publicintId
{
get
{
returnid;
}
set
{
id=value;
}
}
privatestringname;
publicstringName
{
get
{
returnname;
}
set
{
name=value;
}
}

privatedoubleprice;
publicdoublePrice
{
get
{
returnprice;
}
set
{
price=value;
}
}
}

然后写一个对象比较的类，实现IComparer<T>接口。

internalclassListComparer<TBaseBusinessObject>:IComparer<TBaseBusinessObject>
{
privatestringpropertyName;

publicListComparer(stringPropertyName)
{
propertyName=PropertyName;
}


IComparer<tbasebusinessobject></tbasebusinessobject>Members#regionIComparer<TBaseBusinessObject>Members

publicintCompare(TBaseBusinessObjectx,TBaseBusinessObjecty)
{
PropertyInfoproperty=typeof(TBaseBusinessObject).GetProperty(propertyName);
if(property.PropertyType==Type.GetType("System.Int16"))
{
intxNumber=0;
intyNumber=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());
}
returnxNumber.CompareTo(yNumber);
}
if(property.PropertyType==Type.GetType("System.Int32"))
{
intxNumber=0;
intyNumber=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());
}
returnxNumber.CompareTo(yNumber);
}
if(property.PropertyType==Type.GetType("System.Double"))
{
doublexNumber=0;
doubleyNumber=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());
}
returnxNumber.CompareTo(yNumber);
}
if(property.PropertyType==Type.GetType("System.DateTime"))
{
DateTimexTime=DateTime.Now;
DateTimeyTime=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());
}
returnxTime.CompareTo(yTime);
}
if((property.PropertyType==Type.GetType("System.String"))||(property.PropertyType==Type.GetType("System.Boolean")))
{
stringxText=string.Empty;
stringyText=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();
}
returnxText.CompareTo(yText);
}
return0;

}

#endregion
}

然后是写了一个List继承List<T>类的集合，

publicclassBaseBusinessObjectList<TBaseBusinessObject>:List<TBaseBusinessObject>
{
publicvoidSort(stringsortfield,boolisAscending)
{
//这里实例化了刚才写的IComparer类。
ListComparer<TBaseBusinessObject>listComparer=newListComparer<TBaseBusinessObject>(sortfield);
base.Sort(listComparer);
if(!isAscending)base.Reverse();
}
}

于是就写完了，用的时候

BaseBusinessObjectList<Entity>list=newBaseBusinessObjectList<Entity>();
Entityobj=newEntity();
obj.Id=1;
obj.Name="test";
obj.Price=3.23;
list.Add(obj);

//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);

完了~~~