网上查了一些关于合计的代码 ，但发现大都都不尽人意，就自己再根据资料改了一下。
#region 合计
//调用方法示例
//HeJi heji = null;
//heji = new HeJi(label1,dataGridView1);
//heji.AddHeji("FTransportOperator_ID",4);
//heji.AddHeji("FLoadingTeam_ID",6);
//heji.sumdata(); public class HeJi
{ //两个控件 文本，表格
private Label Lab1;
private DataGridView Grid;
//定义类的私有变量，两个是滚动条
HScrollBar hs;
VScrollBar vs; //合计的信息列表
List<HeJiMessage> li = new List<HeJiMessage>(); //初始化
public HeJi() { }
public HeJi(Label lab, DataGridView grid)
{
Lab1 = lab;
Grid = grid; hs = ((HScrollBar)this.Grid.Controls[]);
vs = ((VScrollBar)this.Grid.Controls[]);
hs.ValueChanged += new EventHandler(hs_ValueChanged);
vs.ValueChanged += new EventHandler(vs_ValueChanged);
Lab1.Paint += new PaintEventHandler(Lab_Paint);
Grid.CellValueChanged += new DataGridViewCellEventHandler(CellValueChanged);
}
//滚动条委托事件
public void hs_ValueChanged(object sender, EventArgs e)
{
this.Lab1.Invalidate();
}
public void vs_ValueChanged(object sender, EventArgs e)
{
this.Lab1.Invalidate();
} /// <summary>
/// 表格数值改变
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
sumdata();
} /// <summary>
/// //添加需要合计的列
/// </summary>
/// <param name="name">字段名</param>
/// <param name="number">列索引</param>
public void AddHeji(string name, int number)
{
Rectangle rec = this.Grid.GetCellDisplayRectangle(number, , false);
li.Add(new HeJiMessage(name, number,rec));
} /// <summary>
/// paint委托事件，重画
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Lab_Paint(object sender, PaintEventArgs e)
{
DataGridViewColumnCollection Columns = this.Grid.Columns;
int count = Grid.Columns.Count;
Graphics grf = e.Graphics;
StringFormat strfmt = new StringFormat();
strfmt.Alignment = StringAlignment.Center;
//判断有显示的行，利用行获取Rectangle位置信息
foreach (HeJiMessage heji in li)
{
Rectangle rec = this.Grid.GetCellDisplayRectangle(heji.CellNumber, , false);
for (int i = ; i < Grid.Rows.Count; i++)
{
if (Grid.Rows[i].Displayed)
{
rec = this.Grid.GetCellDisplayRectangle(heji.CellNumber, i, false);
heji.Rec = rec;
Console.WriteLine("显示行为：" + i.ToString());
break;
}
}
grf.DrawString(string.Format("{0:F2}",heji.hejiSum ), this.Lab1.Font, Brushes.Black, this.Grid.Left + heji.Rec.X, , strfmt);
}
} //计算总和
public void sumdata()
{ DataGridViewRowCollection rows = this.Grid.Rows;
foreach (HeJiMessage heji in li)
{
heji.hejiSum = ;
foreach (DataGridViewRow row in rows)
{
heji.hejiSum += Convert.ToDecimal(row.Cells[heji.hejiName].Value);
}
} //重画
this.Lab1.Invalidate();
}
} //合计需要的信息，列名，列索引，总和，位置信息
public class HeJiMessage
{
public string hejiName = null;
public int CellNumber = ;
public decimal hejiSum = ;
public Rectangle Rec;
public HeJiMessage() { }
/// <summary>
/// 初始化
/// </summary>
/// <param name="name">列名</param>
/// <param name="number">列索引</param>
/// <param name="rec">位置信息</param>
public HeJiMessage(string name, int number,Rectangle rec)
{
hejiName = name;
CellNumber = number;
Rec = rec;
}
} #endregion