Hello all,我在使用 List<T>中, 碰到问题，请看代码: public class Rec { public string gzbh; public string Gzbh { get{return gzbh;} } public string xm; public string Xm{ get{return xm;} } public Rec(string _gzBH, string _XM) { this.gzbh = _gzBH; this.xm = _XM; } public bool FindRec(string _gzBH) { return gzbh == _gzBH; } public bool remove(string _gzBH) { //? 这里该怎么写 }….public List<Rec> selectedRec = new List<Rec>();我的问题是，我想通过Rec的对象中的一Rec.gzbh来remove一条gzbh与给定参数相同的List<Rec>项。
我该怎么做呢？The algorithm is, to remove an item which the gzbh equals to a certain value. Should I predefine the remove(string _gzBH) in the Rec class? If so, how to define it?
算法是，实例化的selectedRec的成员gzbh如果与给定的_GZBH相同的话，就删除selectedRec中的该项。
我该怎么做？
冰天雪地裸跪求答。--------------------------------------------------------------------------------
我该怎么做呢？The algorithm is, to remove an item which the gzbh equals to a certain value. Should I predefine the remove(string _gzBH) in the Rec class? If so, how to define it?
算法是，实例化的selectedRec的成员gzbh如果与给定的_GZBH相同的话，就删除selectedRec中的该项。
我该怎么做？
冰天雪地裸跪求答。--------------------------------------------------------------------------------
如果你要写remove你应该有个list
你写的这个应该像 drawitembase的内容
public class DrawItemList:List<DrawItemBase>
{
public DrawItemList()
{
}
//将对像插入列表
public new void Add(DrawItemBase itemBase)
{
base.Insert(0, itemBase);
} public void Draw(Graphics g)
{
for (int i = this.Count-1; i >-1; i--)
{
//判定是否绑定了数据源
if (!string.IsNullOrEmpty(this[i].ValueColumn) && CheckDataTabelIsNoteNullOrEmpty(dataTable))
{
//设定数据源打印时的属性
this[i].DataSource = dataTable;
this[i].CurrentPage = currentPage;
this[i].RowHeight = rowsHeight;
this[i].PageRowsCount = pageRowsCount;
this[i].Selected = false;
} this[i].Draw(g);
//如果对像是选中状态,则画出手柄
if (this[i].Selected)
{
this[i].DrawTracker(g);
}
}
} //数据源
private DataTable dataTable;
//当前是哪一页
private int currentPage = 1;
//每页有多少行
private int pageRowsCount = 3;
//每行行高
private int rowsHeight = 15; /// <summary>
/// 在数据源打印时的行高.默认15
/// </summary>
public int RowsHeight
{
get
{
return rowsHeight;
}
set
{
rowsHeight = value;
}
} /// <summary>
/// 设定每页中有多少条记录
/// </summary>
public int PageRowsCount
{
get
{
return pageRowsCount;
}
set
{
pageRowsCount = value;
}
} /// <summary>
/// 当前要显示的是哪一页
/// </summary>
public int CurrentPage
{
get
{
return currentPage;
}
set
{
currentPage = value;
}
} public DataTable DataSource
{
get
{
return dataTable;
}
set
{
dataTable = value;
}
} /// <summary>
/// 检查DataTable是否为空
/// </summary>
/// <param name="dt">要检查的DataTable</param>
/// <returns>False:为空 True:不为空</returns>
protected bool CheckDataTabelIsNoteNullOrEmpty(DataTable dt)
{
bool IsNotNull = true;
if (DataSource == null)
{
IsNotNull = false;
}
else if (DataSource.Rows.Count == 0)
{
IsNotNull = false;
}
return IsNotNull;
}
/// <summary>
/// 获取对像列中选定的对像
/// </summary>
/// <param name="index">选中的是第几个</param>
/// <returns></returns>
public DrawItemBase GetSelectItem(int index)
{
int i = -1;
foreach (DrawItemBase o in this)
{
if (o.Selected)
{
i++;
if (i == index)
return o;
}
} return null;
} /// <summary>
/// 选择所有对像
/// </summary>
public void SelectAll()
{
foreach (DrawItemBase item in this)
{
item.Selected = true;
}
} /// <summary>
/// 将所选中第一个对像放到最后
/// </summary>
/// <param name="selectindex"></param>
public void SendBlow()
{
if (this.Count > 1)
{
DrawItemBase dib = GetSelectItem(0);
this.Remove(dib);
this.Insert(this.Count, dib);
}
}
/// <summary>
/// 将选中的第一个对像放到最前面
/// </summary>
/// <param name="selectindex"></param>
public void SendFront()
{
if (this.Count > 1)
{
DrawItemBase dib = GetSelectItem(0);
this.Remove(dib);
this.Insert(0, dib);
}
} /// <summary>
/// 取消选择所有对像
/// </summary>
public void UnSelectAll()
{
foreach (DrawItemBase item in this)
{
item.Selected = false;
}
} /// <summary>
/// 选择矩形中的对像
/// </summary>
/// <param name="rect"></param>
public void SelectInRectangle(Rectangle rect)
{
foreach (DrawItemBase item in this)
{
if (item.IntersectsWith(rect))
{
item.Selected = true ;
}
}
}
/// <summary>
/// 获取有多少个选中的对像
/// </summary>
public int SelectionCount
{
get
{
int n = 0; foreach (DrawItemBase o in this)
{
if (o.Selected)
n++;
} return n;
}
} /// <summary>
/// 获取选中对像列表中第一个对像在列表中的索引号
/// </summary>
public int GetSelectedIndex
{
get
{
int n = -1;
foreach (DrawItemBase o in this)
{
n++;
if (o.Selected)
{
break;
}
} return n;
}
}
}
http://blog.csdn.net/dunao/archive/2008/10/27/3157013.aspx
string value="ggg";
foreach(Ret obj in list)
{
if(obj.gzBH==value)
{
list.Remove(obj);
break;
}
}
myList.RemoveAll(item => item.Gzbh == gzbh);
这样的方式。
myList.Remove( myList.FirstOrDefault(item => item.someProperty == somevalue) );
道理更RemoveAll一样，但在实际使用中我们用的更多的是通过接口调用对象，而Ilist没有RemoveAll方法